CA2119962C - Light sensing means - Google Patents
Light sensing meansInfo
- Publication number
- CA2119962C CA2119962C CA002119962A CA2119962A CA2119962C CA 2119962 C CA2119962 C CA 2119962C CA 002119962 A CA002119962 A CA 002119962A CA 2119962 A CA2119962 A CA 2119962A CA 2119962 C CA2119962 C CA 2119962C
- Authority
- CA
- Canada
- Prior art keywords
- light
- light pipe
- sensing means
- electrical signal
- pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
- B60R1/02—Rear-view mirror arrangements
- B60R1/08—Rear-view mirror arrangements involving special optical features, e.g. avoiding blind spots, e.g. convex mirrors; Side-by-side associations of rear-view and other mirrors
- B60R1/083—Anti-glare mirrors, e.g. "day-night" mirrors
- B60R1/088—Anti-glare mirrors, e.g. "day-night" mirrors using a cell of electrically changeable optical characteristic, e.g. liquid-crystal or electrochromic mirrors
Abstract
An improved light sensing means incorporating means effective to direct light from a convenient location to a conveniently placed light sensor, the light sensing means being effective to optimize the performance and economy of automatic rearview mirror systems for automotive vehicles.
Description
~jJ ~
IMPROYED lLIGHT SENSIN& MF,ANS
Brief Summary of the Invention This invention relates to light sensing means and, more particularly, ~o improved light sensing means adapted for use in automatic rearview mirrors for automotive vehicles.
As is well known in the art, automatic rearview mirrors for automotive vehicles have hele~ofole been decign~d to include multiple functions such as motorized positioning of mirror reflect*e elPment~ the control of the reflectivity of electrochromic el~mpnt~ map lights, electronic compasses, and various other filnction~ Such automatic rearview mirrors incol~!c,ld~
light sensors, such as c~r~mium sulfide photo-res;stive light sensors or photo-diodes or other types of sensors, which are effective to control various functions of the mirror including the reflectivity of the mirror in response to light, such as ambient light, sensed forwardly of the vehicle, and light, such as glare causing light, sensed rearwardly of the vehicle. At the same time, the printed circuit boards, to which the electrical components which perform the various mirror control functions are attached, are being made smaller. Some of the cases or housings for the mirrors which perform multiple functions are too large and too thick for it to be practical to mount the re¦uired light sensor or sensors on the mirror printed circuit board Other situations may occur where the printed circuit board is too small to extend to the location or locations where each light level is viewed through an aperture in the mirror ~l~mentQ or in the mirror assembly housing. In such sihiations one or more of the sensing functions are required to be performed by mounting the sensors separately from the printed circuit boar~ or by using special tneans to direct the light from the sensing aperture to the respective sensor. The latter approach is the one taken by the embodiments of automatic rearview mirrors described herein.
Heretofore automatic mirrors have normally used two light sensors, one to detect glare from the rear of a vehicle and one to detect the ambient light level, usually forwardly of the vehicle. These sensors have often been mounted directly on either the main printed circuit board or on an auxiliary printed circuit board and have been positioned directly in the path of the light to be measured. However, there have been some exceptions where the light sensors have been mounted on the mirror case itself and connected by sets of lead wires.
Another exception has been where both sensors have been positioned on a common substrate and the light sources to be measured have been reflected to the sensor from opposing directions by two reflecting surfaces as described in U.S.
Patent 4,475,036. U.S. Patent 5,223,814 also teaches the use of a reflector to reflect light to a photo-sensor. Mounting the sensors separately and attaching them to the circuit with wires is expensive and inconvenient for testing, for calibration, and for the assembly process. The reflector assemblies disclosed in U.S. Patent No. 4,475,036 and U.S.
Patent No. 5,223,814 do not incorporate refracting means to properly characterize the angular response pattern to that which is needed by the application as do the devices which are disclosed herein.
U.S. Patents 4,443,057; 4,917,477 and 5,204,778, in combination, describe in detail automatic rearview mirror control systems, and the teaching of such patents includes descriptions of many of the considerations for the positioning and for the fields of view which are preferred for the front and rear sensors. Details of such patents which bear directly on the present invention will be described herein in detail.
VLS:jj 2 For proper operation, each of the sensors must be characterized to have the correct angular response and enough light must be directed to each sensor to assure proper performance of the sensors and of the associated electrical circuitry at the minimum operating light levels.
With the means to direct the light to the sensor there is an option to concentrate the light directed to the sensor, eo attenuate the light, or to leave ~he light leYel substantially unchanged.
The light level range ~rom the rear, even when viewed directly by the sensor, is seldom much above the minimum range which is required for proper performance of the sensor and its ~oc;ated circuitry. Thus, it is usually necessary to use a means to direct light to the rearward sensor which maintains an optical gain which is not much below unity. Furthermore, it is often desirable for the optical gain of the means to direct light to the rear sensor to exceed unity ~or the rear sensor thereby utilizing the rear sensor and its associated circuit in a more stable operating range and improving the quality of the mirror control function. For the forward sensor, the light level range when viewed directly often exceeds that needed for satisfactory performance so it is often permissible to use a means to direct light to the forward sensor which has an optical gain which is less than unity.
The field of view of each sensor, i.e. its sensitivity versus the direction from which the light is coming, is an i-~-pOI~t attribute of the sensor. The rear sensor must be sensitive to light em~n~ting from glare sources. However, if the field of view is too large, light from sources such as roadside signs will frequently cause unwanted (lirnmin~ of the mirror. Thus, the field of view for the rear sensor should be generally limited to that which is re~quired to admit the light from glare sources to which the mirror should respond. l'he front sensor should preferably have a field of view which generally ~orresponds to that which the driver sees ': ?
.ough the windshield of the vehicle.
It should be understood that there is a subtle relationship between the relative ~lelds of view of the front and rear sensors of the mirror. With a commonly used high sensitivity setting of the mirror control circuit, a typical mirror will dim when both the front and back light sensors are exposed to equal light levels from small area sources. However, the mirror does not normally dim during dawn and dusk when the mirror is surrounded by the panorama of light exposing both the front and back sensors to this same panorama of light because with a diffused light source, the effect of the light entering the sensor from each portion of its field of view is additive. Thus, the large field of view of the front sensor increases its sensitivity to a diffused or scattered light source which provides light over a large area within its field of view. Thus, the front sensor with its larger field of view can have a larger response to a diffused source than the rear sensor with its more restricted field of view has to the same diffused source. This can be true even when the rear sensor with its more restricted field of view is more sensitive than the front sensor to a point light source which is within its field of view. Thus, in the mirror control, the larger field of view of the front sensor ca.n more than make up for the greater sensitivity of the rear sensor. In a typical vehicle, the viewing area of the rear sensor is restricted both by~,the aperture built into the mirror itself and by ehe walls and ceiling of the passenger compartment, while the field of view of the front sensor is made large and is less restricted by its wide angle view through the win(lchielcl.
An object of the present invention is to overcome disadvantages in prior light sensing means of the indicated character and to provide an improved light sensing means inco.LJol~ing improved means effective to direct light from a convenient location to a conveniently placed .
:
3 ) .lsor.
Another object of the presen~ invention is to provide irnproved light sensing means incorporating improved means effective to collect light in desired proportions o ver a desired field of view for a light sensor and to transmit such light to the sensor.
Another object of the invention is to provide improved light sensing means which may be utilized when the desired field of view is different for the rearwardly facing sensor than for the forwardly facing sensor of an automatic rearview mirror system for an automotive vehicles.
Another object of the present invention is to provide improved light sensing means effective to optimize the performance and economy of automatic rearview mirror systems for automotive vehicles.
Another object of the present invention is to provide improved light sensing means effective to substantially smooth unwanted peaks and valleys in the sensors' angular response pattern without over scattering to the extent that the sensitivity and overall angular response are unduly compromised.
Another object of the present invention is to incolporate a Fresnel lens in an opening in the mirror casP to properly characterize the angular piCklllp pattern of the light which is directed through the lens to the sensor.
Another object of the present invention is to incorporate a means to divert the energy from discharges of static electricity which may enter around the light pipe or lens so that it does not damage components in the electrical control circuit.
Still another object of the present invention is to provide an improved light sensing means effective to properly chalacterize the field of view of light sensor for its particular application.
3 ~ ~ ~"~
.1 important specific instance of this objective is to widen the field of view for the forward facing sensor.
The above as well as other ubjects and advantages of the present invention will become apparent from the following description, the appended claims and the accompanying drawings.
Brief Description of the Drawings Figure 1 is a longitll-lin~l cross-sectional view of a forwardly facing sensor and light pipe assembly embodying the present invention and as viewed from the top of an automatic rearview mirror system for automotive vehicles;
Figure 2 is an exploded view, viewed generally from the top, of the assembly of Figure l;
Figure 3 is a longitlldin~l cross-sectional view of a light pipe intended for use in an assembly similar to Figure 1 but which is adapted for use with a rearwardly facing sensor of an automatic rearview mirror system for automotive vehicles;
Pigure 4 is a plot comparing the response versus angle of a photocell with and without a light pipe similar to the one illustrated in Figure l; and Figures S and 5a are a top and side view, respectively, of another embodiment of the invention incorporating a Fresnel lens.
Detailed Description Referring to Figures 1 through 4, there are situations in automatic rearview mirror systems for automotive vehicles where the cost will be lowered or the pelrol~llal~ce irnproved by using a light pipe for either the forwardly facing sensor only, the rearwardly facing sensor only, or for both sensors. The most common situation where use of a light pipe is advantageous :
r 3 one for which a light pipe is required only for the forwardly facing sensor. In the majority of these automatic rearview mirrors, the mirror casP is too thick to mount the photocell directly on the circuit board and still view light ~rom the front of a vehicle through a wide viewing angle. Thus, the light pipe arrangement for the ~orwardly facing sensor will be described in the greatest detail and mo~ tions to add a light pipe to the rear sensor will be described separately.
Figure 1 depicts a top view of the cross sectioned forwardly facing sensor assembly. A
partial, sectioned view of the front of a mirror housing 10 is shown. A longituflin~lly sectioned view of a transparent light pipe 12 is shown, and a section~d view of a plastic bracket 14 is illustrated. A top side view of a c~clmillm sulfide photo-resistive light sensor 16 is shown and a sectioned view of a portion of the printed circuit board 18 is shown.
The mirror housing defines an opening 20 and is provided with a flange 22 which adjoins a mating flange 24 of light pipe 12 and serves to position the light pipe in the opening 20 provided in the mirror housing and to keep the light pipe from sliding out through the opening 20. The chamfer 26 is provided leading into the flanged portion of the housing to facilitate assembly. The plastic holder 14 secures and positions the other end of the light pipe 12 and positions and hold's the photo-resistive light sensor 16. The chamfer 28 f~ilit~t~s insertion of the end of light pipe 12 in the holder 14. A ledge 30 m~int~3inc a small but consistent space 32 between the end 34 of the light pipe and the photocell face 36. Three or more ribs, one of which is shown at 38, are molded into the plastic holder 14 and equally spaced around the circumference to prevent large area contact between the holder 14 and the light pipe 12. Such area of contact if not prevented could lirnit the capability of the light pipe to internally reflect the light rays.
The circuit board 18 defines a pair of holes 40 which key the mating positioning tabs 42 on plastic holder 14. The solder connection 44 is one of the two lead wire connections of the photocell 16 to separate conductive circuit traces on the printed circuit board. The circuit, the mirror element, and the remainder of the automatic rearview mirror may be constructed in accordance with teaching in any of the above referenced patents.
The light pipe 12 is preferably made from a clear grade of polycarbonate or from acrylic. The acrylic has the greater clarity but may be marginal in meeting maximum temperature requirements and is more brittle and subject to cracking. In lengths and configurations where the slightly reduced clarity of the polycarbonate yields satisfactory results, it is suggested as the best mode plastic for the light pipe. The light pipe holder 14 is preferably made of a soft plastic and sized so that the light pipe 12 is held in place by a light press fit. This facilitates assembly and eliminates the chance that the light pipe will rattle in the plastic holder 14. Although not necessary to retain the internal reflection, ribs similar to those used in the holder may be incorporated in the housing 10. Such ribs allow enough compliance so that the light pipe 12 and the mating ribbed hole in the mirror housing can be sized to allow insertion with a very light press fit. Such an arrangement will permit easy assembly while eliminating the possibility that vibration will cause the light pipe to rattle in the mirror housing opening 20.
The viewing end 46 of the light pipe is concave to increase the viewing angle of the light pipe. A light ray 48 enters the opening of the light pipe at point 50 and continues into the light pipe as ray 52. The ray 52 is bent somewhat closer to the direction of the longitudinal axis of VLS:jj 8 . light pipe because of the slope of the lens surface at point S0 which is due to the concave curvature of the light pipe face 46. The ray 52 strikes the cylindrical surface 54 of the light pipe at 56 and is internally reflected as ray 58 which exits the light pipe. The ray 58 is refracted in a direction which diverges from the direction of the longitudinal axis of the light pipe and continues as ray 60 which finally strikes the face 36 of the photocell. Because the ray 60 is re~racted to a more divergent angle when it exits the light pipe, it is prudent to minimi7f the distance between the end 34 of the light pipe and the photocell surface 36 because a ~ignifi~ntly greater distance would cause this ray to miss the photocell thereby reducing the light level reading of the photocell. Rays which diverge too much from the direction of the longitudinal axis of the light pipe are not internally reflected by the cylindrical surface 54 of the light pipe but pass through it . This loss of rays coming too much from the side limits the range of angles over which rays are tr~ncmitt~d to the photocell by the light pipe. It has been verified experimentally that use of a 0.375 inch diameter concave entrance section having a radius of curvature of approximately 0.25 inches and a 0.25 inch diameter for the cylindrical section of the light pipe 12 increased the angle of acceptance substantially over that of a light pipe with a flat end. It is suggested that the best radius of curvature be determined by eYI ~rim~nt~tion and also that the concave surface 46 need not be spherical. A shape approaching a conical shape where the radius of curvature decreases toward the center may be preferred. At the same time the peak response to a small area light source directly in front of the light pipe was reduced by about 20 percent relative to the light received directly by the photocell ~rom the same light source when the light pipe is removed. As in~lir~ted earlier, this modest reduction in sensitivity is normally permissible for the forwardly facing sensor so the design trade here which increases ~ viewing angle while causing a modest loss in sensitivity is a good one. To illustrate why the sensitivity to directly impinging rays is reduced, note that the ray 62 which enters the light pipe at point 64 continues as ray 67 and exits at point 68. If the light pipe had been a simple straight cylindrical piece formed by Plimin~ting the wider heaid and extending the cylindrical section of the light pipe 12, this ray would have been captured. It should be noted that although the mo-lific~tinn indicated here normally improves performance substantially, a simple, straight, flat ended light pipe can give acceptable performance and is not outside of the scope of this invention.
One final problem must be solved in order to give the best pc:lroi-l-ance. As a light source moves across the viewing aperture (from top to bottom in Figure 1~, the entering light ray first reflects off of the lower surface of the light pipe as illustrated by the rays 48, 52, 58 and 60. A ray from a source which is axially aligned with the light pipe passes directly to the sensor without reflection and a ray from a source substa.ntially below the axis of the light pipe as viewed in Figure 1 is reflected from the top surface of the cylindricali light pipe 12 so that the ray path is approximately a mirror image of the pal~h taken by the ray 48 which has been traced. These changes in path and reflective modes for rays coming from different directions cause substantia]i qariations in the sensor response as the light source traverses the aperture of the sensor assembly. One way to elimin~tP most of the variations is to frost the surface 46 where the light enters. However, this scatters many of the entering rays through angles which diverge so far from the axis of the light pipe that they are not reflected from, but rather are lost through, the wall of cylindrical section of the light pipe thereby reducing the sensitivity of the light pipe substantially and a]itsring the angular response pattern. Furthermore, the loss is most ' L ~ 2 ~ ere for the rays which entered at the largest angle, thus, making wide angle scattering directly counterproductive to the attempts to increase the viewing angle of the sensor. Ihe angular spacing between the peaks and valleys in the response curve, due to the shifts in reflective mode, are fairly closely spaced. Thus, the individual peaks can be averaged into adjacent valleys and vice versa by scattering the light through comparably small angles. This type of scattering, in which the majority of the rays are scattered through the limited range of angles, is achieved by texturing the surface 46 of the entrance lens. Either a regular but very shallow pyramid pattern or a more random "orange peel" like pattern are two texturing options which may be used to create the scattering through a limited angle. If desired, other texturing options may be utilized.
To limit the angle of the scattering, the deviation in the angle of the normal to each (or at least most of) the elements of the textured surface from the angle of the corresponding normal of the concave reference surface must be kept small enough to locally refract the light rays only in the range of angles for which the limited scattering is desired.
Figure 2 is an exploded view of the sensor configuration shown in Figure 1. It is included to complement the sectioned view in Figure 1. The only feature not evident in Figure 1 is a visor 70 which is placed over the sensor aperture 20 to shield the front sensor from lamps which are directly''overhead. Reasons for this are detailed in the referenced patents. It should be noted that with the light pipe, it is possible to restrict the upward viewing angle by altering the design of the light pipe instead of using the visor. Such a modification is desirable in many embodiments but in this one would result in a more complicated design for the light pipe which would no longer be symmetrical about its center axis so that it would have to be keyed to maintain its proper orientation.
Figure 3 is a cross-sectional view of a ligh~pipe which is designed to replace the light pipe of Figure 1 for a rearwardly facing sensor application in an automatic rearview mirror system. The concave entrance lens surface 4S of Figure 1 has been replaced by a mildly convex surface 72. The light ray 74 entering the lens at 76 from an angle similar to the entrance of light ray 48 of Figure 1 is not refracted suf~lciently toward the longitudinal axis of the light pipe to be internally reflected. Instead of being directed to the sensor by the light pipe, it tS~vels as ray 78 to po;nt 80 on the surface of light pipe 82 and through the surface where it is lost as ray 84 outside the light pipe. The ray 86 which is more nearly in lin~ with the longitudinal axis of the light pipe than ray 48 of Figure 1 is captured by the light pipe and directed to the sensor.
Caution must be used to not make the acceptance angle too narrow. Providing a larger radius of curvature (i.e. more nearly flat) for surface 72 increases the acceptance angle of the lens and reduces the optical gain. The optical gain is increased by the convex lens and serves to enhance the normally weak optical signal to the rearwardly facing sensor. The variations in response with angle are not as predominant with the convex lens but can be averaged by the same type of texturing and limited angle scattering as used for the ligh~ pipe of Figure l. It should be noted that the aperture 20 in the housing does not need to be on the same axis or even to be aligned in the sam~e direction as the sensor face. The cylindrical sections such as 54, 55 or 82 can for example be elongated or bent in gentle curves. Reflections can al50 be added to redirect the iighsf through greater directional changes.
3~xperimental Results Referring to Figure 4, the two curves 90 and 92 are plots of the relative con~luct~nce of a ç~rlmium sulfide photo-resistive sensor versus the off-axis angle of the light source. The thin :
.e curve 90 is a plot for the photocell alone and the hea~ier line curve 92 is a plot for the same photocell to which a light pipe similar to that depicted in Figure 1 has been added. Points 94 are the points for which the response of the photocell with the light pipe is 5û percent of its maximum response at point 96. l[hese 50 percent response points are separated by 96 degrees.
Similarly, points 98 are the points for which the response of the photocell without the light pipe is 50 percent of its maximum response at point 100. These 50 percent response points are separated by 86 degrees. Thus, the light pipe with the specially design~d lens has not only prevented the light pipe from narrowing the angular pattern but has widened it instead which is desirable for the front sensor. Some ripple shown at peaks 96, 102 and 104 and valleys 106 and 108 is still present for the response with the light pipe. This is a tolerable amount but could be further reduced by mildly increasing the texturing of the lens surface to moderately increase the angle through which the light rays are scattered.
Figure 5 is the simplified top view and Figure Sa is the simplified side view of another embodiment of the invention. In this embodiment of the invention, a Fresnel lens 110 is provided which is used to characterize the sensitivity versus direction for a forwardly facing sensor 112. The lens 110 is secured in an opening 114 in mirror housing 116 which is shown in ~r~EmPnt~ry vi~w. In the configuration shown the leads 118 and 120 of c~lmium sulfide photo-resistor 112 are soldered to conductive tracks on the circuit board 122 which is shown in fr~gmPnt~ry view. The circuit board is mounted at a substantial distance back of the lens 110 and housing operlirlg 114 so that the dir~ect lines of view to the sides are blocked by the walls of the mirror housing. In many situations it is not practical or aesthetically pleasing to make the opening large enough to provide the required field of view without the aid of something to .rect the light rays. The angled portion 124 of top view 12S of lens 110 refracts light ray 128 so that it continues as ray 130 to the photosensitive face of photocell 112. Likewise ray 132 coming from the opposite side is bent so that it continues as ray 134 to the face of the photocell 112. The rays 128 and 132 coming from the large side angles would not have hit the sensing area of the photocell were it not for the lens. Thus, the lens 110 serves to direct the rays 128 and 132 which are within the desired field of view to the photocell where they are sensed. In practice, the width of surface 124 of the lens and of the surfaces like it would normally be made shorter and the surfaces more numerous. The relatively small number of surfaces is depicted for graphical clarity.
Referring to Figure Sa, the elevational view in-lic~t~d by the ray 136 is sat;sfactory so the lens is not designed to appreciably alter its elevational direction as it continues as ray 138 to the fiace of the sensor 112. Likewise rays coming from an elevational direction much below that of ray 140 would normally be blocked by the hood of the vehicle so it is not necessary to include rays coming from lower elevational angles in thle sensing pattern. Since the rays 136 and 140 do not have to be refracted to a different elevational angle by the lens, the lens is of a cylindrical design.
Other applications require lenses which bend the ligh~ rays in both vertical and horizontal directions. Such lenses may be dçsiogned to characterize the directional sensitivity in accol~dance with the present invention. The negative focal length of lens 110 causes a modest reduction in t~he light level measured by the photocell as col,lpa~ed with a configuration ~P-si~n~Pd for direct viewing. As in-lic~tPd above, this is acceptable for the forwardly facing sensor. For a fdly facing sensor, a lens of positive focal length which is similar in construction to the ..' r:
.e shown may be used to restrict instead of to increase the field of view and to at the same time desirably increase the light level which reaches the photocell. In certain circumct~ncP~, for example, those which require a specially shaped opening, it may be desirable to provide a negative focal length in one orientation and a positive focal length in another to properly shape the directional sensitivity pattern of the sensor. This might well be the case for either the forwardly facing or the rearwardly facing sensor if a long and narrow aperture is provided for the light to enter the sensor housing.
The projection 142 is a conductive point or other conductive object which is placed to serve as a lightning rod to divert sparks from static electricity which may enter around the edges of the lens and which could otherwise discharge to a point on the photocell or circuit board and thereby damage a component. The projection 142 is preferably attached to circuit ground but may alternately be attached to or routed close enough to any conductor which will carry the spark energy away from projection 142 without damage to the circuit. A first alternative to the spark arrestor is to use a lens which is integrally molded into the housing or which is otherwise attached to the housing so as to form an insul~ting barrier to the sparks. A second alternative is to provide physical spacing which is adequate to prevent sparks from expected static sources from bridging the gap from the opening around the light pipe or lens to the photocell or other vulnerable components. For many electrostatic discharge re~uirements, the embodiment in Figure 1 provides such a spacing. Any of the methods just enumerated can be applied to light pipes such as shown in Figure 1 when ~the spacing is not adeguate. Also, light pipe holder 14 in Figure 1 may be made of conductive material and attached to or routed close to a suitable discharge path to serve as the spark arrestor. When using a conductive holder, spacing to the ~ ~ r; ~ ' ~
;,.: .'1. 1 ''.~ Q! ~: 4 ,.,otocell leads must be adequate to prevent short circuits or unwanted lea~age currents.
Several desirable features of any one of the designs may be incorporated interch~n~e~hly in another of the designs. For example, the lens in Figure 5 does not have ~ be of the lF:resnel type but coul~ be of a non-Fresnel type such as used in Figure 1. S~condly, a Fresnel type of lens could be used for the front surface of the light pipe in Figures 1, 2 iand 3. Thirdly, a lens may be used on the inside end of the light pipe which otherwise has a design similar to that of Figure 1 to characterize the light pattern project~d onto the photocell surface. In such a design the spacing between the end of the light pipe and the photocell surface may be increased perhaps at the cost of a reduced amount of light being transmitted to the photocell. Fourth, as an alternate construction in Figure 1, the light pipe may be secured to the housing thereby eliminating the need for holder 14. The photocell may then be mounted directly to the circuit board or a simpler spacer or holder may be substituted for holder 14 depicted in Figure 1.
It will be understood that the plastic in the light pi~pe and lens configurations ean be tinted to further cllaldelelize the sensor for a particular color response characteristic. It should also ~e understood that the above description is applicable to photo-diodes, and other types of sensors and not limited to the photo-resistors used in the preferled embodiment.
While pr~ir~ cd embodiments of the invention have been illustratPd and described, it will be understood that various changes and modifications may be made without departing from the spirit of the invention.
IMPROYED lLIGHT SENSIN& MF,ANS
Brief Summary of the Invention This invention relates to light sensing means and, more particularly, ~o improved light sensing means adapted for use in automatic rearview mirrors for automotive vehicles.
As is well known in the art, automatic rearview mirrors for automotive vehicles have hele~ofole been decign~d to include multiple functions such as motorized positioning of mirror reflect*e elPment~ the control of the reflectivity of electrochromic el~mpnt~ map lights, electronic compasses, and various other filnction~ Such automatic rearview mirrors incol~!c,ld~
light sensors, such as c~r~mium sulfide photo-res;stive light sensors or photo-diodes or other types of sensors, which are effective to control various functions of the mirror including the reflectivity of the mirror in response to light, such as ambient light, sensed forwardly of the vehicle, and light, such as glare causing light, sensed rearwardly of the vehicle. At the same time, the printed circuit boards, to which the electrical components which perform the various mirror control functions are attached, are being made smaller. Some of the cases or housings for the mirrors which perform multiple functions are too large and too thick for it to be practical to mount the re¦uired light sensor or sensors on the mirror printed circuit board Other situations may occur where the printed circuit board is too small to extend to the location or locations where each light level is viewed through an aperture in the mirror ~l~mentQ or in the mirror assembly housing. In such sihiations one or more of the sensing functions are required to be performed by mounting the sensors separately from the printed circuit boar~ or by using special tneans to direct the light from the sensing aperture to the respective sensor. The latter approach is the one taken by the embodiments of automatic rearview mirrors described herein.
Heretofore automatic mirrors have normally used two light sensors, one to detect glare from the rear of a vehicle and one to detect the ambient light level, usually forwardly of the vehicle. These sensors have often been mounted directly on either the main printed circuit board or on an auxiliary printed circuit board and have been positioned directly in the path of the light to be measured. However, there have been some exceptions where the light sensors have been mounted on the mirror case itself and connected by sets of lead wires.
Another exception has been where both sensors have been positioned on a common substrate and the light sources to be measured have been reflected to the sensor from opposing directions by two reflecting surfaces as described in U.S.
Patent 4,475,036. U.S. Patent 5,223,814 also teaches the use of a reflector to reflect light to a photo-sensor. Mounting the sensors separately and attaching them to the circuit with wires is expensive and inconvenient for testing, for calibration, and for the assembly process. The reflector assemblies disclosed in U.S. Patent No. 4,475,036 and U.S.
Patent No. 5,223,814 do not incorporate refracting means to properly characterize the angular response pattern to that which is needed by the application as do the devices which are disclosed herein.
U.S. Patents 4,443,057; 4,917,477 and 5,204,778, in combination, describe in detail automatic rearview mirror control systems, and the teaching of such patents includes descriptions of many of the considerations for the positioning and for the fields of view which are preferred for the front and rear sensors. Details of such patents which bear directly on the present invention will be described herein in detail.
VLS:jj 2 For proper operation, each of the sensors must be characterized to have the correct angular response and enough light must be directed to each sensor to assure proper performance of the sensors and of the associated electrical circuitry at the minimum operating light levels.
With the means to direct the light to the sensor there is an option to concentrate the light directed to the sensor, eo attenuate the light, or to leave ~he light leYel substantially unchanged.
The light level range ~rom the rear, even when viewed directly by the sensor, is seldom much above the minimum range which is required for proper performance of the sensor and its ~oc;ated circuitry. Thus, it is usually necessary to use a means to direct light to the rearward sensor which maintains an optical gain which is not much below unity. Furthermore, it is often desirable for the optical gain of the means to direct light to the rear sensor to exceed unity ~or the rear sensor thereby utilizing the rear sensor and its associated circuit in a more stable operating range and improving the quality of the mirror control function. For the forward sensor, the light level range when viewed directly often exceeds that needed for satisfactory performance so it is often permissible to use a means to direct light to the forward sensor which has an optical gain which is less than unity.
The field of view of each sensor, i.e. its sensitivity versus the direction from which the light is coming, is an i-~-pOI~t attribute of the sensor. The rear sensor must be sensitive to light em~n~ting from glare sources. However, if the field of view is too large, light from sources such as roadside signs will frequently cause unwanted (lirnmin~ of the mirror. Thus, the field of view for the rear sensor should be generally limited to that which is re~quired to admit the light from glare sources to which the mirror should respond. l'he front sensor should preferably have a field of view which generally ~orresponds to that which the driver sees ': ?
.ough the windshield of the vehicle.
It should be understood that there is a subtle relationship between the relative ~lelds of view of the front and rear sensors of the mirror. With a commonly used high sensitivity setting of the mirror control circuit, a typical mirror will dim when both the front and back light sensors are exposed to equal light levels from small area sources. However, the mirror does not normally dim during dawn and dusk when the mirror is surrounded by the panorama of light exposing both the front and back sensors to this same panorama of light because with a diffused light source, the effect of the light entering the sensor from each portion of its field of view is additive. Thus, the large field of view of the front sensor increases its sensitivity to a diffused or scattered light source which provides light over a large area within its field of view. Thus, the front sensor with its larger field of view can have a larger response to a diffused source than the rear sensor with its more restricted field of view has to the same diffused source. This can be true even when the rear sensor with its more restricted field of view is more sensitive than the front sensor to a point light source which is within its field of view. Thus, in the mirror control, the larger field of view of the front sensor ca.n more than make up for the greater sensitivity of the rear sensor. In a typical vehicle, the viewing area of the rear sensor is restricted both by~,the aperture built into the mirror itself and by ehe walls and ceiling of the passenger compartment, while the field of view of the front sensor is made large and is less restricted by its wide angle view through the win(lchielcl.
An object of the present invention is to overcome disadvantages in prior light sensing means of the indicated character and to provide an improved light sensing means inco.LJol~ing improved means effective to direct light from a convenient location to a conveniently placed .
:
3 ) .lsor.
Another object of the presen~ invention is to provide irnproved light sensing means incorporating improved means effective to collect light in desired proportions o ver a desired field of view for a light sensor and to transmit such light to the sensor.
Another object of the invention is to provide improved light sensing means which may be utilized when the desired field of view is different for the rearwardly facing sensor than for the forwardly facing sensor of an automatic rearview mirror system for an automotive vehicles.
Another object of the present invention is to provide improved light sensing means effective to optimize the performance and economy of automatic rearview mirror systems for automotive vehicles.
Another object of the present invention is to provide improved light sensing means effective to substantially smooth unwanted peaks and valleys in the sensors' angular response pattern without over scattering to the extent that the sensitivity and overall angular response are unduly compromised.
Another object of the present invention is to incolporate a Fresnel lens in an opening in the mirror casP to properly characterize the angular piCklllp pattern of the light which is directed through the lens to the sensor.
Another object of the present invention is to incorporate a means to divert the energy from discharges of static electricity which may enter around the light pipe or lens so that it does not damage components in the electrical control circuit.
Still another object of the present invention is to provide an improved light sensing means effective to properly chalacterize the field of view of light sensor for its particular application.
3 ~ ~ ~"~
.1 important specific instance of this objective is to widen the field of view for the forward facing sensor.
The above as well as other ubjects and advantages of the present invention will become apparent from the following description, the appended claims and the accompanying drawings.
Brief Description of the Drawings Figure 1 is a longitll-lin~l cross-sectional view of a forwardly facing sensor and light pipe assembly embodying the present invention and as viewed from the top of an automatic rearview mirror system for automotive vehicles;
Figure 2 is an exploded view, viewed generally from the top, of the assembly of Figure l;
Figure 3 is a longitlldin~l cross-sectional view of a light pipe intended for use in an assembly similar to Figure 1 but which is adapted for use with a rearwardly facing sensor of an automatic rearview mirror system for automotive vehicles;
Pigure 4 is a plot comparing the response versus angle of a photocell with and without a light pipe similar to the one illustrated in Figure l; and Figures S and 5a are a top and side view, respectively, of another embodiment of the invention incorporating a Fresnel lens.
Detailed Description Referring to Figures 1 through 4, there are situations in automatic rearview mirror systems for automotive vehicles where the cost will be lowered or the pelrol~llal~ce irnproved by using a light pipe for either the forwardly facing sensor only, the rearwardly facing sensor only, or for both sensors. The most common situation where use of a light pipe is advantageous :
r 3 one for which a light pipe is required only for the forwardly facing sensor. In the majority of these automatic rearview mirrors, the mirror casP is too thick to mount the photocell directly on the circuit board and still view light ~rom the front of a vehicle through a wide viewing angle. Thus, the light pipe arrangement for the ~orwardly facing sensor will be described in the greatest detail and mo~ tions to add a light pipe to the rear sensor will be described separately.
Figure 1 depicts a top view of the cross sectioned forwardly facing sensor assembly. A
partial, sectioned view of the front of a mirror housing 10 is shown. A longituflin~lly sectioned view of a transparent light pipe 12 is shown, and a section~d view of a plastic bracket 14 is illustrated. A top side view of a c~clmillm sulfide photo-resistive light sensor 16 is shown and a sectioned view of a portion of the printed circuit board 18 is shown.
The mirror housing defines an opening 20 and is provided with a flange 22 which adjoins a mating flange 24 of light pipe 12 and serves to position the light pipe in the opening 20 provided in the mirror housing and to keep the light pipe from sliding out through the opening 20. The chamfer 26 is provided leading into the flanged portion of the housing to facilitate assembly. The plastic holder 14 secures and positions the other end of the light pipe 12 and positions and hold's the photo-resistive light sensor 16. The chamfer 28 f~ilit~t~s insertion of the end of light pipe 12 in the holder 14. A ledge 30 m~int~3inc a small but consistent space 32 between the end 34 of the light pipe and the photocell face 36. Three or more ribs, one of which is shown at 38, are molded into the plastic holder 14 and equally spaced around the circumference to prevent large area contact between the holder 14 and the light pipe 12. Such area of contact if not prevented could lirnit the capability of the light pipe to internally reflect the light rays.
The circuit board 18 defines a pair of holes 40 which key the mating positioning tabs 42 on plastic holder 14. The solder connection 44 is one of the two lead wire connections of the photocell 16 to separate conductive circuit traces on the printed circuit board. The circuit, the mirror element, and the remainder of the automatic rearview mirror may be constructed in accordance with teaching in any of the above referenced patents.
The light pipe 12 is preferably made from a clear grade of polycarbonate or from acrylic. The acrylic has the greater clarity but may be marginal in meeting maximum temperature requirements and is more brittle and subject to cracking. In lengths and configurations where the slightly reduced clarity of the polycarbonate yields satisfactory results, it is suggested as the best mode plastic for the light pipe. The light pipe holder 14 is preferably made of a soft plastic and sized so that the light pipe 12 is held in place by a light press fit. This facilitates assembly and eliminates the chance that the light pipe will rattle in the plastic holder 14. Although not necessary to retain the internal reflection, ribs similar to those used in the holder may be incorporated in the housing 10. Such ribs allow enough compliance so that the light pipe 12 and the mating ribbed hole in the mirror housing can be sized to allow insertion with a very light press fit. Such an arrangement will permit easy assembly while eliminating the possibility that vibration will cause the light pipe to rattle in the mirror housing opening 20.
The viewing end 46 of the light pipe is concave to increase the viewing angle of the light pipe. A light ray 48 enters the opening of the light pipe at point 50 and continues into the light pipe as ray 52. The ray 52 is bent somewhat closer to the direction of the longitudinal axis of VLS:jj 8 . light pipe because of the slope of the lens surface at point S0 which is due to the concave curvature of the light pipe face 46. The ray 52 strikes the cylindrical surface 54 of the light pipe at 56 and is internally reflected as ray 58 which exits the light pipe. The ray 58 is refracted in a direction which diverges from the direction of the longitudinal axis of the light pipe and continues as ray 60 which finally strikes the face 36 of the photocell. Because the ray 60 is re~racted to a more divergent angle when it exits the light pipe, it is prudent to minimi7f the distance between the end 34 of the light pipe and the photocell surface 36 because a ~ignifi~ntly greater distance would cause this ray to miss the photocell thereby reducing the light level reading of the photocell. Rays which diverge too much from the direction of the longitudinal axis of the light pipe are not internally reflected by the cylindrical surface 54 of the light pipe but pass through it . This loss of rays coming too much from the side limits the range of angles over which rays are tr~ncmitt~d to the photocell by the light pipe. It has been verified experimentally that use of a 0.375 inch diameter concave entrance section having a radius of curvature of approximately 0.25 inches and a 0.25 inch diameter for the cylindrical section of the light pipe 12 increased the angle of acceptance substantially over that of a light pipe with a flat end. It is suggested that the best radius of curvature be determined by eYI ~rim~nt~tion and also that the concave surface 46 need not be spherical. A shape approaching a conical shape where the radius of curvature decreases toward the center may be preferred. At the same time the peak response to a small area light source directly in front of the light pipe was reduced by about 20 percent relative to the light received directly by the photocell ~rom the same light source when the light pipe is removed. As in~lir~ted earlier, this modest reduction in sensitivity is normally permissible for the forwardly facing sensor so the design trade here which increases ~ viewing angle while causing a modest loss in sensitivity is a good one. To illustrate why the sensitivity to directly impinging rays is reduced, note that the ray 62 which enters the light pipe at point 64 continues as ray 67 and exits at point 68. If the light pipe had been a simple straight cylindrical piece formed by Plimin~ting the wider heaid and extending the cylindrical section of the light pipe 12, this ray would have been captured. It should be noted that although the mo-lific~tinn indicated here normally improves performance substantially, a simple, straight, flat ended light pipe can give acceptable performance and is not outside of the scope of this invention.
One final problem must be solved in order to give the best pc:lroi-l-ance. As a light source moves across the viewing aperture (from top to bottom in Figure 1~, the entering light ray first reflects off of the lower surface of the light pipe as illustrated by the rays 48, 52, 58 and 60. A ray from a source which is axially aligned with the light pipe passes directly to the sensor without reflection and a ray from a source substa.ntially below the axis of the light pipe as viewed in Figure 1 is reflected from the top surface of the cylindricali light pipe 12 so that the ray path is approximately a mirror image of the pal~h taken by the ray 48 which has been traced. These changes in path and reflective modes for rays coming from different directions cause substantia]i qariations in the sensor response as the light source traverses the aperture of the sensor assembly. One way to elimin~tP most of the variations is to frost the surface 46 where the light enters. However, this scatters many of the entering rays through angles which diverge so far from the axis of the light pipe that they are not reflected from, but rather are lost through, the wall of cylindrical section of the light pipe thereby reducing the sensitivity of the light pipe substantially and a]itsring the angular response pattern. Furthermore, the loss is most ' L ~ 2 ~ ere for the rays which entered at the largest angle, thus, making wide angle scattering directly counterproductive to the attempts to increase the viewing angle of the sensor. Ihe angular spacing between the peaks and valleys in the response curve, due to the shifts in reflective mode, are fairly closely spaced. Thus, the individual peaks can be averaged into adjacent valleys and vice versa by scattering the light through comparably small angles. This type of scattering, in which the majority of the rays are scattered through the limited range of angles, is achieved by texturing the surface 46 of the entrance lens. Either a regular but very shallow pyramid pattern or a more random "orange peel" like pattern are two texturing options which may be used to create the scattering through a limited angle. If desired, other texturing options may be utilized.
To limit the angle of the scattering, the deviation in the angle of the normal to each (or at least most of) the elements of the textured surface from the angle of the corresponding normal of the concave reference surface must be kept small enough to locally refract the light rays only in the range of angles for which the limited scattering is desired.
Figure 2 is an exploded view of the sensor configuration shown in Figure 1. It is included to complement the sectioned view in Figure 1. The only feature not evident in Figure 1 is a visor 70 which is placed over the sensor aperture 20 to shield the front sensor from lamps which are directly''overhead. Reasons for this are detailed in the referenced patents. It should be noted that with the light pipe, it is possible to restrict the upward viewing angle by altering the design of the light pipe instead of using the visor. Such a modification is desirable in many embodiments but in this one would result in a more complicated design for the light pipe which would no longer be symmetrical about its center axis so that it would have to be keyed to maintain its proper orientation.
Figure 3 is a cross-sectional view of a ligh~pipe which is designed to replace the light pipe of Figure 1 for a rearwardly facing sensor application in an automatic rearview mirror system. The concave entrance lens surface 4S of Figure 1 has been replaced by a mildly convex surface 72. The light ray 74 entering the lens at 76 from an angle similar to the entrance of light ray 48 of Figure 1 is not refracted suf~lciently toward the longitudinal axis of the light pipe to be internally reflected. Instead of being directed to the sensor by the light pipe, it tS~vels as ray 78 to po;nt 80 on the surface of light pipe 82 and through the surface where it is lost as ray 84 outside the light pipe. The ray 86 which is more nearly in lin~ with the longitudinal axis of the light pipe than ray 48 of Figure 1 is captured by the light pipe and directed to the sensor.
Caution must be used to not make the acceptance angle too narrow. Providing a larger radius of curvature (i.e. more nearly flat) for surface 72 increases the acceptance angle of the lens and reduces the optical gain. The optical gain is increased by the convex lens and serves to enhance the normally weak optical signal to the rearwardly facing sensor. The variations in response with angle are not as predominant with the convex lens but can be averaged by the same type of texturing and limited angle scattering as used for the ligh~ pipe of Figure l. It should be noted that the aperture 20 in the housing does not need to be on the same axis or even to be aligned in the sam~e direction as the sensor face. The cylindrical sections such as 54, 55 or 82 can for example be elongated or bent in gentle curves. Reflections can al50 be added to redirect the iighsf through greater directional changes.
3~xperimental Results Referring to Figure 4, the two curves 90 and 92 are plots of the relative con~luct~nce of a ç~rlmium sulfide photo-resistive sensor versus the off-axis angle of the light source. The thin :
.e curve 90 is a plot for the photocell alone and the hea~ier line curve 92 is a plot for the same photocell to which a light pipe similar to that depicted in Figure 1 has been added. Points 94 are the points for which the response of the photocell with the light pipe is 5û percent of its maximum response at point 96. l[hese 50 percent response points are separated by 96 degrees.
Similarly, points 98 are the points for which the response of the photocell without the light pipe is 50 percent of its maximum response at point 100. These 50 percent response points are separated by 86 degrees. Thus, the light pipe with the specially design~d lens has not only prevented the light pipe from narrowing the angular pattern but has widened it instead which is desirable for the front sensor. Some ripple shown at peaks 96, 102 and 104 and valleys 106 and 108 is still present for the response with the light pipe. This is a tolerable amount but could be further reduced by mildly increasing the texturing of the lens surface to moderately increase the angle through which the light rays are scattered.
Figure 5 is the simplified top view and Figure Sa is the simplified side view of another embodiment of the invention. In this embodiment of the invention, a Fresnel lens 110 is provided which is used to characterize the sensitivity versus direction for a forwardly facing sensor 112. The lens 110 is secured in an opening 114 in mirror housing 116 which is shown in ~r~EmPnt~ry vi~w. In the configuration shown the leads 118 and 120 of c~lmium sulfide photo-resistor 112 are soldered to conductive tracks on the circuit board 122 which is shown in fr~gmPnt~ry view. The circuit board is mounted at a substantial distance back of the lens 110 and housing operlirlg 114 so that the dir~ect lines of view to the sides are blocked by the walls of the mirror housing. In many situations it is not practical or aesthetically pleasing to make the opening large enough to provide the required field of view without the aid of something to .rect the light rays. The angled portion 124 of top view 12S of lens 110 refracts light ray 128 so that it continues as ray 130 to the photosensitive face of photocell 112. Likewise ray 132 coming from the opposite side is bent so that it continues as ray 134 to the face of the photocell 112. The rays 128 and 132 coming from the large side angles would not have hit the sensing area of the photocell were it not for the lens. Thus, the lens 110 serves to direct the rays 128 and 132 which are within the desired field of view to the photocell where they are sensed. In practice, the width of surface 124 of the lens and of the surfaces like it would normally be made shorter and the surfaces more numerous. The relatively small number of surfaces is depicted for graphical clarity.
Referring to Figure Sa, the elevational view in-lic~t~d by the ray 136 is sat;sfactory so the lens is not designed to appreciably alter its elevational direction as it continues as ray 138 to the fiace of the sensor 112. Likewise rays coming from an elevational direction much below that of ray 140 would normally be blocked by the hood of the vehicle so it is not necessary to include rays coming from lower elevational angles in thle sensing pattern. Since the rays 136 and 140 do not have to be refracted to a different elevational angle by the lens, the lens is of a cylindrical design.
Other applications require lenses which bend the ligh~ rays in both vertical and horizontal directions. Such lenses may be dçsiogned to characterize the directional sensitivity in accol~dance with the present invention. The negative focal length of lens 110 causes a modest reduction in t~he light level measured by the photocell as col,lpa~ed with a configuration ~P-si~n~Pd for direct viewing. As in-lic~tPd above, this is acceptable for the forwardly facing sensor. For a fdly facing sensor, a lens of positive focal length which is similar in construction to the ..' r:
.e shown may be used to restrict instead of to increase the field of view and to at the same time desirably increase the light level which reaches the photocell. In certain circumct~ncP~, for example, those which require a specially shaped opening, it may be desirable to provide a negative focal length in one orientation and a positive focal length in another to properly shape the directional sensitivity pattern of the sensor. This might well be the case for either the forwardly facing or the rearwardly facing sensor if a long and narrow aperture is provided for the light to enter the sensor housing.
The projection 142 is a conductive point or other conductive object which is placed to serve as a lightning rod to divert sparks from static electricity which may enter around the edges of the lens and which could otherwise discharge to a point on the photocell or circuit board and thereby damage a component. The projection 142 is preferably attached to circuit ground but may alternately be attached to or routed close enough to any conductor which will carry the spark energy away from projection 142 without damage to the circuit. A first alternative to the spark arrestor is to use a lens which is integrally molded into the housing or which is otherwise attached to the housing so as to form an insul~ting barrier to the sparks. A second alternative is to provide physical spacing which is adequate to prevent sparks from expected static sources from bridging the gap from the opening around the light pipe or lens to the photocell or other vulnerable components. For many electrostatic discharge re~uirements, the embodiment in Figure 1 provides such a spacing. Any of the methods just enumerated can be applied to light pipes such as shown in Figure 1 when ~the spacing is not adeguate. Also, light pipe holder 14 in Figure 1 may be made of conductive material and attached to or routed close to a suitable discharge path to serve as the spark arrestor. When using a conductive holder, spacing to the ~ ~ r; ~ ' ~
;,.: .'1. 1 ''.~ Q! ~: 4 ,.,otocell leads must be adequate to prevent short circuits or unwanted lea~age currents.
Several desirable features of any one of the designs may be incorporated interch~n~e~hly in another of the designs. For example, the lens in Figure 5 does not have ~ be of the lF:resnel type but coul~ be of a non-Fresnel type such as used in Figure 1. S~condly, a Fresnel type of lens could be used for the front surface of the light pipe in Figures 1, 2 iand 3. Thirdly, a lens may be used on the inside end of the light pipe which otherwise has a design similar to that of Figure 1 to characterize the light pattern project~d onto the photocell surface. In such a design the spacing between the end of the light pipe and the photocell surface may be increased perhaps at the cost of a reduced amount of light being transmitted to the photocell. Fourth, as an alternate construction in Figure 1, the light pipe may be secured to the housing thereby eliminating the need for holder 14. The photocell may then be mounted directly to the circuit board or a simpler spacer or holder may be substituted for holder 14 depicted in Figure 1.
It will be understood that the plastic in the light pi~pe and lens configurations ean be tinted to further cllaldelelize the sensor for a particular color response characteristic. It should also ~e understood that the above description is applicable to photo-diodes, and other types of sensors and not limited to the photo-resistors used in the preferled embodiment.
While pr~ir~ cd embodiments of the invention have been illustratPd and described, it will be understood that various changes and modifications may be made without departing from the spirit of the invention.
Claims (9)
1. In an automatic rearview mirror system for automotive vehicles, the combination including a variable reflectance member the reflectivity of which varies as a function of an electrical signal, light sensing means effective to detect light and generate a corresponding electrical signal indicative of the sensed light level, light directing means, and means mounting said light directing means in spaced relationship with respect to said light sensing means whereby light passing through said light directing means impinges on said light sensing means, said light directing means being in the form of a light pipe, one end of said light pipe defining a curvilinear lens, and means operable to change the reflectivity of said reflectance member as a function of an electrical signal generated by said light sensing means.
2. In an automatic rearview mirror system for automotive vehicles, the combination including a variable reflectance member the reflectivity of which varies as a function of an electrical signal, light sensing means effective to sense light and generate a corresponding electrical signal indicative of the sensed light level, a light pipe, said light pipe having the capability of internally reflecting light impinging on one end thereof to the other end thereof, said one end of said light pipe defining a curvilinear lens, means mounting said light pipe adjacent said light sensing means whereby light emanating from said other end of said light pipe impinges upon said light sensing means, and means operable to change the reflectivity of said reflectance member as a function of an electrical signal generated by said light sensing means.
3. In an automatic rearview mirror system for automotive vehicles, the combination including an electro-optic variable reflectance member the reflectivity of which varies as a function of an electrical signal, light sensing means effective to sense light and generate a corresponding electrical signal indicative of the sensed light level, a light pipe, said light pipe having the capability of internally reflecting light impinging on one end thereof to the other end thereof, said one end of said light pipe defining a concave lens, means mounting said light pipe adjacent said light sensing means whereby light emanating from said other end of said light pipe impinges upon said light sensing means, and means operable to change the reflectivity of said electro-optic reflectance member as a function of an electrical signal generated by said light sensing means.
4. In an automatic rearview mirror system for automotive vehicles, the combination including an electrochromic variable reflectance member the reflectivity of which varies as a function of an electrical signal, light sensing means effective to sense light and generate a corresponding electrical signal indicative of the sensed light level, a light pipe, said light pipe having the capability of internally reflecting light impinging on one end thereof to the other end thereof, said one end of said light pipe defining a convex lens, means mounting said light pipe adjacent said light sensing means whereby light emanating from said other end of said light pipe impinges upon said light sensing means, and means operable to change the reflectivity of said electrochromic reflectance member as a function of an electrical signal generated by said light sensing means.
5. In an automatic rearview mirror system for automotive vehicles, the combination including a variable reflectance member the reflectivity of which varies as a function of an electrical signal, light sensing means effective to sense light and generate a corresponding electrical signal indicative of the sensed light level, a light pipe, said light pipe having the capability of internally reflecting light impinging on one end thereof to the other end thereof, said one end of said light pipe defining a Fresnel lens, means mounting said light pipe adjacent said light sensing means whereby light emanating from said other end of said light pipe impinges upon said light sensing means, and means operable to change the reflectivity of said reflectance member as a function of an electrical signal generated by said light sensing means.
6. In an automatic rearview mirror system for automotive vehicles, the combination including a housing having a front wall and defining a chamber, said front wall defining an opening communicating with said chamber, a variable reflectance member disposed in said chamber, the reflectivity of said variable reflectance member varying as a function of an electrical signal, a base disposed within said chamber, light sensing means mounted on said base and effective to detect light and generate a corresponding electrical signal indicative of the light level, a light pipe, said light pipe being mounted in said chamber and extending between said opening in said front wall and said base, said light pipe being capable of internally reflecting light impinging on one end thereof to the other end thereof, said one end of said light pipe defining a curvilinear lens, said other end of said light pipe being disposed in confronting relationship with respect to said light sensing means, and means operable to change the reflectivity of said reflectance member as a function of an electrical signal generated by said light sensing means.
7. In an automatic rearview mirror system for automotive vehicles, the combination including a housing having a front wall and defining a chamber, said front wall defining an opening communicating with said chamber, a variable reflectance member carried by said housing, the reflectivity of said variable reflectance member varying as a function of an electrical signal, a base disposed within said chamber, light sensing means mounted on said base and effective to detect light and generate a corresponding electrical signal indicative of the light level, a light pipe, said light pipe being mounted in said chamber and extending between said opening in said front wall and said base, said light pipe being capable of internally reflecting light impinging on one end thereof to the other end thereof, said one end of said light pipe defining a concave lens, said other end of said light pipe being disposed in confronting relationship with respect to said light sensing means, and means operable to change the reflectivity of said reflectance member as a function of an electrical signal generated by said light sensing means.
8. In an automatic rearview mirror system for automotive vehicles, the combination including a housing having a front wall and defining a chamber, said front wall defining an opening communicating with said chamber, an electro-optic variable reflectance member carried by said housing, the reflectivity of said variable reflectance member varying as a function of an electrical signal, a base disposed within said chamber, light sensing means mounted on said base and effective to detect light and generate a corresponding electrical signal indicative of the detected light level, a light pipe, said light pipe being mounted in said chamber and extending between said opening in said front wall and said base, said light pipe being capable of internally reflecting light impinging on one end thereof to the other end thereof, said one end of said light pipe defining a lens, said other end of said light pipe being disposed in confronting relationship with respect to said light sensing means, and means operable to change the reflectivity of said reflectance member as a function of an electrical signal generated by said light sensing means.
9. In an automatic rearview mirror system for automotive vehicles, the combination including a housing having a front wall and defining a chamber, said front wall defining an opening communicating with said chamber, an electrochromic variable reflectance member carried by said member, the reflectivity of said electrochromic variable reflectance member varying as a function of an electrical signal, a base disposed within said chamber, light sensing means mounted on said base and effective to detect light and generate a corresponding electrical signal indicative of the light level, a light pipe, said light pipe being mounted in said chamber and extending between said opening in said front wall and said base, said light pipe being capable of internally reflecting light impinging on one end thereof to the other end thereof, said one end of said light pipe defining a Fresnel lens, said other end of said light pipe being disposed in confronting relationship with respect to said light sensing means, and means operable to change the reflectivity of said electrochromic reflectance member as a function of an electrical signal generated by said light sensing means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/110,373 US5434407A (en) | 1993-08-23 | 1993-08-23 | Automatic rearview mirror incorporating light pipe |
| US110,373 | 1993-08-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2119962A1 CA2119962A1 (en) | 1995-02-24 |
| CA2119962C true CA2119962C (en) | 1998-06-30 |
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ID=22332667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002119962A Expired - Fee Related CA2119962C (en) | 1993-08-23 | 1994-03-25 | Light sensing means |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US5434407A (en) |
| CA (1) | CA2119962C (en) |
Families Citing this family (172)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5877897A (en) | 1993-02-26 | 1999-03-02 | Donnelly Corporation | Automatic rearview mirror, vehicle lighting control and vehicle interior monitoring system using a photosensor array |
| US6822563B2 (en) | 1997-09-22 | 2004-11-23 | Donnelly Corporation | Vehicle imaging system with accessory control |
| US6891563B2 (en) | 1996-05-22 | 2005-05-10 | Donnelly Corporation | Vehicular vision system |
| US7655894B2 (en) | 1996-03-25 | 2010-02-02 | Donnelly Corporation | Vehicular image sensing system |
| US8120652B2 (en) * | 1997-04-02 | 2012-02-21 | Gentex Corporation | System for controlling vehicle equipment |
| US6611610B1 (en) * | 1997-04-02 | 2003-08-26 | Gentex Corporation | Vehicle lamp control |
| US6587573B1 (en) * | 2000-03-20 | 2003-07-01 | Gentex Corporation | System for controlling exterior vehicle lights |
| US7653215B2 (en) | 1997-04-02 | 2010-01-26 | Gentex Corporation | System for controlling exterior vehicle lights |
| US6130421A (en) | 1998-06-09 | 2000-10-10 | Gentex Corporation | Imaging system for vehicle headlamp control |
| US6141137A (en) | 1998-08-26 | 2000-10-31 | Gentex Corporation | Electrochromic media for producing a preselected color |
| US5837994C1 (en) | 1997-04-02 | 2001-10-16 | Gentex Corp | Control system to automatically dim vehicle head lamps |
| US6774988B2 (en) * | 2002-07-30 | 2004-08-10 | Gentex Corporation | Light source detection and categorization system for automatic vehicle exterior light control and method of manufacturing |
| US6861809B2 (en) * | 1998-09-18 | 2005-03-01 | Gentex Corporation | Headlamp control to prevent glare |
| US6049171A (en) | 1998-09-18 | 2000-04-11 | Gentex Corporation | Continuously variable headlamp control |
| US6631316B2 (en) * | 2001-03-05 | 2003-10-07 | Gentex Corporation | Image processing system to control vehicle headlamps or other vehicle equipment |
| JP3003638B2 (en) * | 1997-08-05 | 2000-01-31 | 日本電気株式会社 | Semiconductor device and manufacturing method thereof |
| US5964514A (en) * | 1997-09-24 | 1999-10-12 | Chrysler Corporation | Illuminating instrument panel gauge with indicator and graphics |
| US6396040B1 (en) | 1998-10-12 | 2002-05-28 | Control Devices, Inc. | Ambient light sensor |
| US6359274B1 (en) * | 1999-01-25 | 2002-03-19 | Gentex Corporation | Photodiode light sensor |
| DE19913061A1 (en) * | 1999-03-17 | 2000-09-21 | Magna Reflex Holding Gmbh | Rearview mirror |
| US6137620A (en) | 1999-04-30 | 2000-10-24 | Gentex Corporation | Electrochromic media with concentration-enhanced stability, process for the preparation thereof and use in electrochromic devices |
| US6597489B1 (en) * | 1999-06-30 | 2003-07-22 | Gentex Corporation | Electrode design for electrochromic devices |
| US7064882B2 (en) | 2002-09-30 | 2006-06-20 | Gentex Corporation | Electrochromic devices having no positional offset between substrates |
| US6396408B2 (en) | 2000-03-31 | 2002-05-28 | Donnelly Corporation | Digital electrochromic circuit with a vehicle network |
| TW576933B (en) * | 2001-05-25 | 2004-02-21 | Wavien Inc | Collecting and condensing system, method for collecting electromagnetic radiation emitted by a source, tapered light pipe (TLP), numerical aperture (NA) conversion device, and portable front projection system |
| AUPR602101A0 (en) * | 2001-07-02 | 2001-07-26 | Schefenacker Vision Systems Australia Pty Ltd | Auto dimming vehicle mirror |
| US6882287B2 (en) | 2001-07-31 | 2005-04-19 | Donnelly Corporation | Automotive lane change aid |
| US7697027B2 (en) | 2001-07-31 | 2010-04-13 | Donnelly Corporation | Vehicular video system |
| US7008090B2 (en) * | 2001-08-30 | 2006-03-07 | Donnelly Corporation | Vehicle mirror system with light conduiting member |
| US7543946B2 (en) * | 2002-01-10 | 2009-06-09 | Gentex Corporation | Dimmable rearview assembly having a glare sensor |
| US6836576B2 (en) * | 2002-02-08 | 2004-12-28 | Wavien, Inc. | Polarization recovery system using light pipes |
| EP1504276B1 (en) | 2002-05-03 | 2012-08-08 | Donnelly Corporation | Object detection system for vehicle |
| US7683326B2 (en) * | 2002-07-09 | 2010-03-23 | Gentex Corporation | Vehicle vision system with high dynamic range |
| US7565006B2 (en) * | 2002-08-21 | 2009-07-21 | Gentex Corporation | Image acquisition and processing methods for automatic vehicular exterior lighting control |
| WO2004076226A2 (en) | 2003-02-21 | 2004-09-10 | Gentex Corporation | Automatic vehicle exterior light control system assemblies |
| US8045760B2 (en) * | 2003-02-21 | 2011-10-25 | Gentex Corporation | Automatic vehicle exterior light control systems |
| US8326483B2 (en) * | 2003-02-21 | 2012-12-04 | Gentex Corporation | Monitoring and automatic equipment control systems |
| US20040217258A1 (en) * | 2003-04-30 | 2004-11-04 | Clugston P. Edward | Solar sensor including reflective element to transform the angular response |
| WO2004098953A2 (en) | 2003-05-06 | 2004-11-18 | Gentex Corporation | Vehicular rearview mirror elements and assemblies incorporating these elements |
| EP1648361A1 (en) * | 2003-07-10 | 2006-04-26 | Lightswitch Safety Systems, Inc. | Light sensor arrangement for auto-darkening lenses and method |
| US7308341B2 (en) | 2003-10-14 | 2007-12-11 | Donnelly Corporation | Vehicle communication system |
| US7526103B2 (en) | 2004-04-15 | 2009-04-28 | Donnelly Corporation | Imaging system for vehicle |
| DE102004027611B4 (en) * | 2004-06-05 | 2011-06-30 | SMR Patents S.à.r.l. | Switching device for dimming an EC mirror glass of a rearview mirror of a motor vehicle |
| US7881496B2 (en) | 2004-09-30 | 2011-02-01 | Donnelly Corporation | Vision system for vehicle |
| US8924078B2 (en) | 2004-11-18 | 2014-12-30 | Gentex Corporation | Image acquisition and processing system for vehicle equipment control |
| US7881839B2 (en) * | 2004-11-18 | 2011-02-01 | Gentex Corporation | Image acquisition and processing systems for vehicle equipment control |
| US7720580B2 (en) | 2004-12-23 | 2010-05-18 | Donnelly Corporation | Object detection system for vehicle |
| TWI282448B (en) * | 2005-12-28 | 2007-06-11 | Benq Corp | Light guide and display device incorporating the same |
| US7404655B2 (en) * | 2006-05-10 | 2008-07-29 | Gentex Corporation | Vehicle rearview assembly including a map light |
| WO2008024639A2 (en) | 2006-08-11 | 2008-02-28 | Donnelly Corporation | Automatic headlamp control system |
| WO2008127752A2 (en) | 2007-01-25 | 2008-10-23 | Magna Electronics | Radar sensing system for vehicle |
| US7914187B2 (en) | 2007-07-12 | 2011-03-29 | Magna Electronics Inc. | Automatic lighting system with adaptive alignment function |
| US8017898B2 (en) | 2007-08-17 | 2011-09-13 | Magna Electronics Inc. | Vehicular imaging system in an automatic headlamp control system |
| EP2191457B1 (en) | 2007-09-11 | 2014-12-10 | Magna Electronics | Imaging system for vehicle |
| US8446470B2 (en) | 2007-10-04 | 2013-05-21 | Magna Electronics, Inc. | Combined RGB and IR imaging sensor |
| EP2401176B1 (en) | 2009-02-27 | 2019-05-08 | Magna Electronics | Alert system for vehicle |
| US8376595B2 (en) | 2009-05-15 | 2013-02-19 | Magna Electronics, Inc. | Automatic headlamp control |
| WO2011014497A1 (en) | 2009-07-27 | 2011-02-03 | Magna Electronics Inc. | Vehicular camera with on-board microcontroller |
| CN102481874B (en) | 2009-07-27 | 2015-08-05 | 马格纳电子系统公司 | Parking assistance system |
| ES2538827T3 (en) | 2009-09-01 | 2015-06-24 | Magna Mirrors Of America, Inc. | Imaging and display system for a vehicle |
| US8890955B2 (en) | 2010-02-10 | 2014-11-18 | Magna Mirrors Of America, Inc. | Adaptable wireless vehicle vision system based on wireless communication error |
| US9117123B2 (en) | 2010-07-05 | 2015-08-25 | Magna Electronics Inc. | Vehicular rear view camera display system with lifecheck function |
| US8964278B2 (en) | 2010-08-09 | 2015-02-24 | Gentex Corporation | Electro-optic system configured to reduce a perceived color change |
| US8228590B2 (en) | 2010-08-09 | 2012-07-24 | Gentex Corporation | Electro-optic system configured to reduce a perceived color change |
| US9180908B2 (en) | 2010-11-19 | 2015-11-10 | Magna Electronics Inc. | Lane keeping system and lane centering system |
| US20120129378A1 (en) * | 2010-11-19 | 2012-05-24 | Delphi Technologies, Inc. | Battery charger having handle that includes light source that emits light through aperture in handle connector |
| WO2012075250A1 (en) | 2010-12-01 | 2012-06-07 | Magna Electronics Inc. | System and method of establishing a multi-camera image using pixel remapping |
| US9264672B2 (en) | 2010-12-22 | 2016-02-16 | Magna Mirrors Of America, Inc. | Vision display system for vehicle |
| WO2012103193A1 (en) | 2011-01-26 | 2012-08-02 | Magna Electronics Inc. | Rear vision system with trailer angle detection |
| US9194943B2 (en) | 2011-04-12 | 2015-11-24 | Magna Electronics Inc. | Step filter for estimating distance in a time-of-flight ranging system |
| US9547795B2 (en) | 2011-04-25 | 2017-01-17 | Magna Electronics Inc. | Image processing method for detecting objects using relative motion |
| US9357208B2 (en) | 2011-04-25 | 2016-05-31 | Magna Electronics Inc. | Method and system for dynamically calibrating vehicular cameras |
| US9834153B2 (en) | 2011-04-25 | 2017-12-05 | Magna Electronics Inc. | Method and system for dynamically calibrating vehicular cameras |
| US8620523B2 (en) | 2011-06-24 | 2013-12-31 | Gentex Corporation | Rearview assembly with multiple ambient light sensors |
| WO2013016409A1 (en) | 2011-07-26 | 2013-01-31 | Magna Electronics Inc. | Vision system for vehicle |
| US9491450B2 (en) | 2011-08-01 | 2016-11-08 | Magna Electronic Inc. | Vehicle camera alignment system |
| US9224889B2 (en) | 2011-08-05 | 2015-12-29 | Gentex Corporation | Optical assembly for a light sensor, light sensor assembly using the optical assembly, and vehicle rearview assembly using the light sensor assembly |
| DE112012003931T5 (en) | 2011-09-21 | 2014-07-10 | Magna Electronics, Inc. | Image processing system for a motor vehicle with image data transmission and power supply via a coaxial cable |
| US9681062B2 (en) | 2011-09-26 | 2017-06-13 | Magna Electronics Inc. | Vehicle camera image quality improvement in poor visibility conditions by contrast amplification |
| US9146898B2 (en) | 2011-10-27 | 2015-09-29 | Magna Electronics Inc. | Driver assist system with algorithm switching |
| US9491451B2 (en) | 2011-11-15 | 2016-11-08 | Magna Electronics Inc. | Calibration system and method for vehicular surround vision system |
| US10099614B2 (en) | 2011-11-28 | 2018-10-16 | Magna Electronics Inc. | Vision system for vehicle |
| WO2013086249A2 (en) | 2011-12-09 | 2013-06-13 | Magna Electronics, Inc. | Vehicle vision system with customized display |
| WO2013126715A2 (en) | 2012-02-22 | 2013-08-29 | Magna Electronics, Inc. | Vehicle camera system with image manipulation |
| US8694224B2 (en) | 2012-03-01 | 2014-04-08 | Magna Electronics Inc. | Vehicle yaw rate correction |
| US10609335B2 (en) | 2012-03-23 | 2020-03-31 | Magna Electronics Inc. | Vehicle vision system with accelerated object confirmation |
| WO2013158592A2 (en) | 2012-04-16 | 2013-10-24 | Magna Electronics, Inc. | Vehicle vision system with reduced image color data processing by use of dithering |
| US8879139B2 (en) | 2012-04-24 | 2014-11-04 | Gentex Corporation | Display mirror assembly |
| US10089537B2 (en) | 2012-05-18 | 2018-10-02 | Magna Electronics Inc. | Vehicle vision system with front and rear camera integration |
| US8983135B2 (en) | 2012-06-01 | 2015-03-17 | Gentex Corporation | System and method for controlling vehicle equipment responsive to a multi-stage village detection |
| WO2013188523A1 (en) | 2012-06-12 | 2013-12-19 | Gentex Corporation | Vehicle imaging system providing multi-stage aiming stability indication |
| WO2014022630A1 (en) | 2012-08-02 | 2014-02-06 | Gentex Corporation | System and method for controlling exterior vehicle lights responsive to detection of a semi-truck |
| US9340227B2 (en) | 2012-08-14 | 2016-05-17 | Magna Electronics Inc. | Vehicle lane keep assist system |
| DE102013217430A1 (en) | 2012-09-04 | 2014-03-06 | Magna Electronics, Inc. | Driver assistance system for a motor vehicle |
| US9446713B2 (en) | 2012-09-26 | 2016-09-20 | Magna Electronics Inc. | Trailer angle detection system |
| US9558409B2 (en) | 2012-09-26 | 2017-01-31 | Magna Electronics Inc. | Vehicle vision system with trailer angle detection |
| US9723272B2 (en) | 2012-10-05 | 2017-08-01 | Magna Electronics Inc. | Multi-camera image stitching calibration system |
| US9121319B2 (en) | 2012-10-16 | 2015-09-01 | Universal Acoustic & Emission Technologies | Low pressure drop, high efficiency spark or particulate arresting devices and methods of use |
| US9743002B2 (en) | 2012-11-19 | 2017-08-22 | Magna Electronics Inc. | Vehicle vision system with enhanced display functions |
| US9090234B2 (en) | 2012-11-19 | 2015-07-28 | Magna Electronics Inc. | Braking control system for vehicle |
| US10025994B2 (en) | 2012-12-04 | 2018-07-17 | Magna Electronics Inc. | Vehicle vision system utilizing corner detection |
| US9481301B2 (en) | 2012-12-05 | 2016-11-01 | Magna Electronics Inc. | Vehicle vision system utilizing camera synchronization |
| US20140218529A1 (en) | 2013-02-04 | 2014-08-07 | Magna Electronics Inc. | Vehicle data recording system |
| US9092986B2 (en) | 2013-02-04 | 2015-07-28 | Magna Electronics Inc. | Vehicular vision system |
| US9870753B2 (en) | 2013-02-12 | 2018-01-16 | Gentex Corporation | Light sensor having partially opaque optic |
| US9207116B2 (en) | 2013-02-12 | 2015-12-08 | Gentex Corporation | Light sensor |
| US10179543B2 (en) | 2013-02-27 | 2019-01-15 | Magna Electronics Inc. | Multi-camera dynamic top view vision system |
| US9688200B2 (en) | 2013-03-04 | 2017-06-27 | Magna Electronics Inc. | Calibration system and method for multi-camera vision system |
| US8867116B1 (en) | 2013-03-15 | 2014-10-21 | Gentex Corporation | Distate electrochromic device |
| US10027930B2 (en) | 2013-03-29 | 2018-07-17 | Magna Electronics Inc. | Spectral filtering for vehicular driver assistance systems |
| US9327693B2 (en) | 2013-04-10 | 2016-05-03 | Magna Electronics Inc. | Rear collision avoidance system for vehicle |
| US10232797B2 (en) | 2013-04-29 | 2019-03-19 | Magna Electronics Inc. | Rear vision system for vehicle with dual purpose signal lines |
| US9508014B2 (en) | 2013-05-06 | 2016-11-29 | Magna Electronics Inc. | Vehicular multi-camera vision system |
| US9205776B2 (en) | 2013-05-21 | 2015-12-08 | Magna Electronics Inc. | Vehicle vision system using kinematic model of vehicle motion |
| US9563951B2 (en) | 2013-05-21 | 2017-02-07 | Magna Electronics Inc. | Vehicle vision system with targetless camera calibration |
| US10567705B2 (en) | 2013-06-10 | 2020-02-18 | Magna Electronics Inc. | Coaxial cable with bidirectional data transmission |
| US9260095B2 (en) | 2013-06-19 | 2016-02-16 | Magna Electronics Inc. | Vehicle vision system with collision mitigation |
| US20140375476A1 (en) | 2013-06-24 | 2014-12-25 | Magna Electronics Inc. | Vehicle alert system |
| US10326969B2 (en) | 2013-08-12 | 2019-06-18 | Magna Electronics Inc. | Vehicle vision system with reduction of temporal noise in images |
| KR101848451B1 (en) | 2013-08-19 | 2018-04-12 | 젠텍스 코포레이션 | Vehicle imaging system and method for distinguishing between vehicle tail lights and flashing red stop lights |
| CN105555611B (en) | 2013-08-19 | 2017-07-07 | 金泰克斯公司 | Vehicle imaging systems and the method for differentiating reflection object and the lamp of another vehicle |
| KR101766635B1 (en) | 2013-09-24 | 2017-08-09 | 젠텍스 코포레이션 | Display mirror assembly |
| CN105593061B (en) | 2013-10-01 | 2018-03-27 | 金泰克斯公司 | System and method for controlling exterior vehicle lights on fast traffic lane |
| US9891100B2 (en) * | 2013-10-10 | 2018-02-13 | Apple, Inc. | Electronic device having light sensor package with diffuser for reduced light sensor directionality |
| EP3068647B1 (en) | 2013-11-15 | 2023-05-10 | Gentex Corporation | Imaging system including dynamic compensation for color attenuation for vehicle windscreens |
| US9499139B2 (en) | 2013-12-05 | 2016-11-22 | Magna Electronics Inc. | Vehicle monitoring system |
| US9988047B2 (en) | 2013-12-12 | 2018-06-05 | Magna Electronics Inc. | Vehicle control system with traffic driving control |
| WO2015116915A1 (en) | 2014-01-31 | 2015-08-06 | Gentex Corporation | Backlighting assembly for display for reducing cross-hatching |
| US10160382B2 (en) | 2014-02-04 | 2018-12-25 | Magna Electronics Inc. | Trailer backup assist system |
| EP3119643B1 (en) | 2014-03-21 | 2018-05-23 | Gentex Corporation | Tri-modal display mirror assembly |
| US9834146B2 (en) | 2014-04-01 | 2017-12-05 | Gentex Corporation | Automatic display mirror assembly |
| US9623878B2 (en) | 2014-04-02 | 2017-04-18 | Magna Electronics Inc. | Personalized driver assistance system for vehicle |
| US9487235B2 (en) | 2014-04-10 | 2016-11-08 | Magna Electronics Inc. | Vehicle control system with adaptive wheel angle correction |
| US10328932B2 (en) | 2014-06-02 | 2019-06-25 | Magna Electronics Inc. | Parking assist system with annotated map generation |
| US9694751B2 (en) | 2014-09-19 | 2017-07-04 | Gentex Corporation | Rearview assembly |
| JP6505839B2 (en) | 2014-11-07 | 2019-04-24 | ジェンテックス コーポレイション | Full screen display mirror actuator |
| JP6367486B2 (en) | 2014-11-13 | 2018-08-01 | ジェンテックス コーポレイション | Rearview mirror system with display device |
| KR101997815B1 (en) | 2014-12-03 | 2019-07-08 | 젠텍스 코포레이션 | Display mirror assembly |
| USD746744S1 (en) | 2014-12-05 | 2016-01-05 | Gentex Corporation | Rearview device |
| US9744907B2 (en) | 2014-12-29 | 2017-08-29 | Gentex Corporation | Vehicle vision system having adjustable displayed field of view |
| US9916660B2 (en) | 2015-01-16 | 2018-03-13 | Magna Electronics Inc. | Vehicle vision system with calibration algorithm |
| US9720278B2 (en) | 2015-01-22 | 2017-08-01 | Gentex Corporation | Low cost optical film stack |
| US10286855B2 (en) | 2015-03-23 | 2019-05-14 | Magna Electronics Inc. | Vehicle vision system with video compression |
| EP3286038A4 (en) | 2015-04-20 | 2018-04-25 | Gentex Corporation | Rearview assembly with applique |
| US10946799B2 (en) | 2015-04-21 | 2021-03-16 | Magna Electronics Inc. | Vehicle vision system with overlay calibration |
| US10819943B2 (en) | 2015-05-07 | 2020-10-27 | Magna Electronics Inc. | Vehicle vision system with incident recording function |
| WO2016187215A1 (en) | 2015-05-18 | 2016-11-24 | Gentex Corporation | Full display rearview device |
| WO2016209877A1 (en) | 2015-06-22 | 2016-12-29 | Gentex Corporation | System and method for processing streamed video images to correct for flicker of amplitude-modulated lights |
| US10214206B2 (en) | 2015-07-13 | 2019-02-26 | Magna Electronics Inc. | Parking assist system for vehicle |
| US10078789B2 (en) | 2015-07-17 | 2018-09-18 | Magna Electronics Inc. | Vehicle parking assist system with vision-based parking space detection |
| US10086870B2 (en) | 2015-08-18 | 2018-10-02 | Magna Electronics Inc. | Trailer parking assist system for vehicle |
| CN108349435B (en) | 2015-10-30 | 2021-06-15 | 金泰克斯公司 | Switching board |
| USD798207S1 (en) | 2015-10-30 | 2017-09-26 | Gentex Corporation | Rearview mirror assembly |
| EP3368375B1 (en) * | 2015-10-30 | 2020-03-04 | Gentex Corporation | Rearview device |
| USD797627S1 (en) | 2015-10-30 | 2017-09-19 | Gentex Corporation | Rearview mirror device |
| USD800618S1 (en) | 2015-11-02 | 2017-10-24 | Gentex Corporation | Toggle paddle for a rear view device |
| US11277558B2 (en) | 2016-02-01 | 2022-03-15 | Magna Electronics Inc. | Vehicle vision system with master-slave camera configuration |
| US11433809B2 (en) | 2016-02-02 | 2022-09-06 | Magna Electronics Inc. | Vehicle vision system with smart camera video output |
| US10160437B2 (en) | 2016-02-29 | 2018-12-25 | Magna Electronics Inc. | Vehicle control system with reverse assist |
| US20170253237A1 (en) | 2016-03-02 | 2017-09-07 | Magna Electronics Inc. | Vehicle vision system with automatic parking function |
| US10055651B2 (en) | 2016-03-08 | 2018-08-21 | Magna Electronics Inc. | Vehicle vision system with enhanced lane tracking |
| USD845851S1 (en) | 2016-03-31 | 2019-04-16 | Gentex Corporation | Rearview device |
| USD817238S1 (en) | 2016-04-29 | 2018-05-08 | Gentex Corporation | Rearview device |
| CN109153355B (en) | 2016-05-26 | 2022-03-22 | 金泰克斯公司 | Waveguide mirror display system |
| US10434948B2 (en) | 2016-06-03 | 2019-10-08 | Gentex Corporation | Display system with phase oriented reflective control |
| US10025138B2 (en) | 2016-06-06 | 2018-07-17 | Gentex Corporation | Illuminating display with light gathering structure |
| WO2018071395A1 (en) | 2016-10-13 | 2018-04-19 | Gentex Corporation | Waveguide mirror display system |
| USD809984S1 (en) | 2016-12-07 | 2018-02-13 | Gentex Corporation | Rearview assembly |
| USD854473S1 (en) | 2016-12-16 | 2019-07-23 | Gentex Corporation | Rearview assembly |
| JP2020505802A (en) | 2016-12-30 | 2020-02-20 | ジェンテックス コーポレイション | Full screen mirror with on-demand spotter view |
| EP3595931A1 (en) | 2017-03-17 | 2020-01-22 | Gentex Corporation | Dual display reverse camera system |
| EP4311978A1 (en) * | 2022-07-28 | 2024-01-31 | Valeo Comfort and Driving Assistance | Display |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4443057A (en) * | 1981-06-01 | 1984-04-17 | Gentex Corporation | Automatic rearview mirror for automotive vehicles |
| CA1247415A (en) * | 1984-03-02 | 1988-12-28 | Isao Sasaki | Light-transmitting fiber |
| JPH0623817B2 (en) * | 1985-07-18 | 1994-03-30 | 旭光学工業株式会社 | LCD projection image display device |
| US4917477A (en) * | 1987-04-06 | 1990-04-17 | Gentex Corporation | Automatic rearview mirror system for automotive vehicles |
| JPH02150812A (en) * | 1988-12-01 | 1990-06-11 | Sharp Corp | Optical circuit coupling element |
| US5315673A (en) * | 1992-03-09 | 1994-05-24 | Transducer Research, Inc. | Optical waveguide vapor sensor |
| US5204778A (en) * | 1992-04-06 | 1993-04-20 | Gentex Corporation | Control system for automatic rearview mirrors |
-
1993
- 1993-08-23 US US08/110,373 patent/US5434407A/en not_active Expired - Fee Related
-
1994
- 1994-03-25 CA CA002119962A patent/CA2119962C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| US5434407A (en) | 1995-07-18 |
| CA2119962A1 (en) | 1995-02-24 |
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