US3704928A - Dental light with dichroic and infrared filters - Google Patents
Dental light with dichroic and infrared filters Download PDFInfo
- Publication number
- US3704928A US3704928A US87792A US3704928DA US3704928A US 3704928 A US3704928 A US 3704928A US 87792 A US87792 A US 87792A US 3704928D A US3704928D A US 3704928DA US 3704928 A US3704928 A US 3704928A
- Authority
- US
- United States
- Prior art keywords
- light
- lens
- filter
- disposed
- dichroic
- 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 - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/04—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for filtering out infrared radiation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/04—Optical design
- F21V7/08—Optical design with elliptical curvature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/22—Reflectors for light sources characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/08—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for producing coloured light, e.g. monochromatic; for reducing intensity of light
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0005—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
- F21W2131/20—Lighting for medical use
- F21W2131/202—Lighting for medical use for dentistry
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S362/00—Illumination
- Y10S362/804—Surgical or dental spotlight
Definitions
- index of the light from the cievice is 97 5 w the 2,798,943 7/1957 Pndeaux ..353/55 X infrared filter iS added, this drops to 0 but the 2,827,554 3/1958 Gunther et a1 ..350/316 X dition of the (chi-oic visih
- the usual infrared filters have a broad cutoff and also absorb visible light in some parts of the spectrum.
- the quality of the light emitted from the fixture without the filter is such that its color-rendering index is 97.5, which is considered excellent, but the addition of the filter drops this index to 88, which is undesirable, since the dentist needs to see the patients teeth in their natural colors.
- the glass filters available for cutting off the far infrared are found to transmit more in the green and yellow than in the blue, and since the incandescent source is comparatively low in blue radiation, this means that the green light will predominate and give the light a greenish tinge which is undesirable.
- FIG. 2 is a longitudinal section through the centerline of the fixture.
- the dotted curve shows the transmission of the infrared filter for visible light and is to be somewhat low in the blue (400-500 millimicrons), higher in the green and yellow (500-600 millimicrons), and low again in the red (600-750 millimicrons). This, in conjunction with the incandescent filament source, produces a somewhat greenish light.
- the full-line curve shows the transmission of the diehroie filter, which is high in the blue, and low in the yellow and green, rising somewhat toward the red.
- the transmission of the infrared filter drops to zero at about 900 millimicrons and continues there up to at least 2,700 millimicrons, which was the limit of the measuring equipment.
- the major components comprise a main housing canister I0, an optical system I2 located within the canister and a flexible boot l4 affixed to the rear end of the canister.
- the boot 14 covers and holds the electrical connections for a lamp [6.
- the lamp being one of the components of the optical system of the fixture, is positioned within an ellipsoidal-shaped reflector I8.
- the lamp and reflector produce an intense source whose light is directed through a rectangular opening 24 centrally located in a fixed light gate 20.
- a spacing rim 22 spaces the lamp and reflector from the light gate so that an optimum amount of light produced by the lamp 16 passes through the gate opening 24 and thence to an aspheric lens 26, and an exterior heat absorbing cover glass 32.
- the optically clad glass rod 40 shown in FIG. 2 is made of a glass rod probe with optically polished ends and encased within a metal casing. One end of the rod 40 extends into the housing 10, and passes through the reflector and terminates just short of the envelope 51 of the lamp, and perpendicular to the axis of the filament 50. The other end of the rod 40 extends outwardly from the housing 10 and is connected to a flexible fiber optic conduit comprised ofa standard bundle of flexible glass fibers 44 in the shape of a conduit having an approximately circular cross section.
- the rod 40 collects from the filament light which travels over the conduit 44 to emerge at the light exit end 48.
- the lens surface facing the source of light that is, the back surface 28 of the lens 26 is coated with a dichroic filter 9 which transmits more blue light than green, and
- the filter can be made in the usual manner with successive thin coats or layers of magnesium fluoride and zinc sulfide, each about onefourth wavelength thick, there being 9 coats of magnesium fluoride and 10 coats of zinc sulfide in all.
- the coatings can be applied by vacuum disposition in the usual manner.
- a lens disposed in front of said light gate, said lens having a spheric side facing said light gate, the other side of said lens being aspheric;
- a dichroic coating disposed on said spheric side of said lens, said coating having higher transmission of blue light than of green, yellow, orange or red light;
Abstract
A fixture for dental illumination, in which an elliptical reflector and light source is used with a light gate and projection lens, these being set in an enclosing canister with the light emerging through the lens, an infrared filter in the path of the light rays to absorb unwanted heat radiation, and a dichroic filter on the surface of the lens facing the reflector to correct the light-rendering index of the emitted light. Without any filter, neither infrared nor visible, the color rendering index of the light from the device is 97.5. When the infrared filter is added, this drops to 88.0, but the addition of the dichroic visible-light filter brings this back to 97.5, which is very good.
Description
()R 3,70 ,92 SEARCH ROOM United States Patent V [151 3,704,928
Cmmbselal- SUBSTITUTE FOR MlSSING on Dec-$1972 [5 1 DENTAL LIGHT WITH DICHRQIC AND 1,279,638 9/1918 Blake ..240/41.a
INFRARED FILTERS OTHER PUBLICATIONS [72] Inventors: Peter M. Coombs, Newton, N.H.;
Ernest Davey, Lynn; Com-ad Degenkolb, et al., Dichroic Safeguards, Journal of ward Kowabki, Marblehead, both the S.M.P.T.E, V01. 76, No. 1,.1an. 1967, pp. 15-17 of Mass. Pr'ma Exam Dav'd Schonber [73] Assrgnee: Sylvnnla Electric Products, Inc. L- Kusmegr [22] Filed: Nov. 9, 1970 Attorney-Norman J. O'Malley, Laurence Burns and [211 App]. No.: 87,792 Ryan [57] ABSTRACT [52] US. Cl. ..350/l, 240/41.15, 240/41.3, A fixture for denial illumination in which an elliptical 5i] i t Cl :;35822 reflector and light source is used with a light gate and [58] d 163 166 projection lens, these being set in an enclosing e 0 canister with the light emerging through the lens, an
350/316; 240/4115 413; 353,55 infrared filter in the path of the light rays to absorb unwanted heat radiation, and a dichroic filter on the [56] References Cited surface of the lens facing the reflector to correct the UNITED STATES PATENTS light-rendering index of the emitted light. Without any filter, neither infrared nor visible, the color rendering 3,371,202 2/1968 Moore et a1. ..240/41.3 index of the light from the cievice is 97 5 w the 2,798,943 7/1957 Pndeaux ..353/55 X infrared filter iS added, this drops to 0 but the 2,827,554 3/1958 Gunther et a1 ..350/316 X dition of the (chi-oic visih|e iight filter brings ihiS 3,113,033 12/1963 Hoxie et al. ..350/1 X back to 97 which is very good.
1,349,706 8/1920 Worcester ..240/41.3
2,338,901 1/1944 Chiti ..240/4l.3 l C1alrn,2 Drawing Flgures PAIENTEDuEc 5 m2 UNCOATED WAVELENGTH IN MILL IMICRONS 400 425 wozsitzwzdmk PETER M. COOMBS ERNEST DAVEY C. EDWARD KOWALSKI INVENTORS ATTORNEY DENTAL LIGHT WITH DICIIROIC AND INFRARED FILTERS BACKGROUND OF THE INVENTION I. Field oflnvention This invention relates to fixtures for dental illumination, and in particular to such fixtures which utilize a heat-absorbing filter to prevent excessive heating of the patients face by infrared radiation.
2. Brief Summary of Prior Art Dental fixtures have been developed using a light source at one focus of an ellipsoidal reflector, and at the other focus a gate having an opening defining the extent of the beam. These provide a high intensity of light on the patients face, but since the light source is an incandescent lamp, most of its radiated energy is infrared, which does not assist the dentist in seeing, but can undesirably heat up the face of the patient on which it falls. A filter plate is used in front of the lens, that is between the lens and the patient's face to absorb the infrared and produce a cooler light.
The usual infrared filters have a broad cutoff and also absorb visible light in some parts of the spectrum. The quality of the light emitted from the fixture without the filter is such that its color-rendering index is 97.5, which is considered excellent, but the addition of the filter drops this index to 88, which is undesirable, since the dentist needs to see the patients teeth in their natural colors.
The glass filters available for cutting off the far infrared are found to transmit more in the green and yellow than in the blue, and since the incandescent source is comparatively low in blue radiation, this means that the green light will predominate and give the light a greenish tinge which is undesirable.
BRIEF SUMMARY OF INVENTION It is here that our invention solves the problem by using an additional filter which cuts down on the green and has high transmission for the blue. The filter also cuts down on the yellow, orange and red somewhat, but since the source is rich in these colors anyway, this merely helps to give a balanced light. The color temperature is raised to an acceptable balance, and the color rendering index is brought back to 97.5. We have discovered that this filter can best be utilized by making it of the dichroic type, which can be coated onto some light-transmitting part of the device. The dichroic filter was tried at the light gate, but the high radiation density at that point destroyed the dichroic coating. A coating on the back of the infrared filter, that is, on the side nearest the lens, was found to give secondary reflections back onto the gate, which was transmitted into the illuminating pattern, which was undesirable. A third approach was tried by coating the external surface of the infrared filter, but this left the coating vunerable to abrasion when cleaned.
We have discovered that all these disadvantages can be overcome by having a dichroic coating on the lens surface which faces the source of light. In the optical system used, this was the spheric side of the lens, the other side being aspheric.
BRIEF SUMMARY OF DRAWINGS Other features, objects and advantages of the invention will be apparent from the following specification, taken in connection with the accompanying drawings in which:
FIG. 1 is a graph of transmittance against wavelength for the infrared filter and for the dichroie filter on the lens; and
FIG. 2 is a longitudinal section through the centerline of the fixture.
DESCRIPTION OF SPECIFIC EMBODIMENTS In FIG. I, the dotted curve shows the transmission of the infrared filter for visible light and is to be somewhat low in the blue (400-500 millimicrons), higher in the green and yellow (500-600 millimicrons), and low again in the red (600-750 millimicrons). This, in conjunction with the incandescent filament source, produces a somewhat greenish light.
The full-line curve shows the transmission of the diehroie filter, which is high in the blue, and low in the yellow and green, rising somewhat toward the red.
Although only the visible transmissions of the filters are shown, the transmission of the infrared filter drops to zero at about 900 millimicrons and continues there up to at least 2,700 millimicrons, which was the limit of the measuring equipment.
Referring to FIG. 2, a cross sectional view of the medical and dental fixture is shown. The major components comprise a main housing canister I0, an optical system I2 located within the canister and a flexible boot l4 affixed to the rear end of the canister. The boot 14 covers and holds the electrical connections for a lamp [6. The lamp, being one of the components of the optical system of the fixture, is positioned within an ellipsoidal-shaped reflector I8. The lamp and reflector produce an intense source whose light is directed through a rectangular opening 24 centrally located in a fixed light gate 20. A spacing rim 22 spaces the lamp and reflector from the light gate so that an optimum amount of light produced by the lamp 16 passes through the gate opening 24 and thence to an aspheric lens 26, and an exterior heat absorbing cover glass 32.
The lens 26 and heat absorbing cover glass 32 are spaced from one another and held by a circular bezel 30. This segment of the optical system produces a very sharply defined rectangular light pattern.
The optically clad glass rod 40 shown in FIG. 2 is made of a glass rod probe with optically polished ends and encased within a metal casing. One end of the rod 40 extends into the housing 10, and passes through the reflector and terminates just short of the envelope 51 of the lamp, and perpendicular to the axis of the filament 50. The other end of the rod 40 extends outwardly from the housing 10 and is connected to a flexible fiber optic conduit comprised ofa standard bundle of flexible glass fibers 44 in the shape of a conduit having an approximately circular cross section.
With this arrangement the rod 40 collects from the filament light which travels over the conduit 44 to emerge at the light exit end 48.
The lens surface facing the source of light, that is, the back surface 28 of the lens 26 is coated with a dichroic filter 9 which transmits more blue light than green, and
which also passes the red. The filter can be made in the usual manner with successive thin coats or layers of magnesium fluoride and zinc sulfide, each about onefourth wavelength thick, there being 9 coats of magnesium fluoride and 10 coats of zinc sulfide in all. The coatings can be applied by vacuum disposition in the usual manner.
What we claim is: l. A dental lighting fixture comprising: an optical system including an ellipsoidal reflector having a light source disposed at one focus thereof; a fixed light gate disposed in front of said optical system, said gate having a rectangular opening disposed at the other focus of said ellipsoidal reflector;
a lens disposed in front of said light gate, said lens having a spheric side facing said light gate, the other side of said lens being aspheric;
a dichroic coating disposed on said spheric side of said lens, said coating having higher transmission of blue light than of green, yellow, orange or red light; and
an infrared absorbing glass fllter disposed in front of said lens, the combination of said dichroic coating and said filter yielding light of high color rendering index.
i l I I!
Claims (1)
1. A dental lighting fixture comprising: an optical system including an ellipsoidal reflector having a light source disposed at one focus thereof; a fixed light gate disposed in front of said optical system, said gate having a rectangular opening disposed at the other focus of said ellipsoidal reflector; a lens disposed in front of said light gate, said lens having a spheric side facing said light gate, the other side of said lens being aspheric; a dichroic coating disposed on said spheric side of said lens, said coating having higher transmission of blue light than of green, yellow, orange or red light; and an infrared absorbing glass filter disposed in front of said lens, the combination of said dichroic coating and said filter yielding light of high color rendering index.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US8779270A | 1970-11-09 | 1970-11-09 |
Publications (1)
Publication Number | Publication Date |
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US3704928A true US3704928A (en) | 1972-12-05 |
Family
ID=22207296
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US87792A Expired - Lifetime US3704928A (en) | 1970-11-09 | 1970-11-09 | Dental light with dichroic and infrared filters |
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Cited By (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3930149A (en) * | 1974-05-28 | 1975-12-30 | Sterndent Corp | Variable intensity dental light |
US4151584A (en) * | 1977-03-14 | 1979-04-24 | Electro Controls Inc. | Light-collecting reflector |
US4195329A (en) * | 1975-11-28 | 1980-03-25 | Les Produits Associes Lpa Sa | Diagnostic lamp, particularly for checking teeth |
US4234247A (en) * | 1978-10-30 | 1980-11-18 | Corning Glass Works | Method of making a reflector |
US4240133A (en) * | 1977-04-19 | 1980-12-16 | Gesellschaft fur Strahlen-und Umweltforschung mbH, Munchen | Quasimonochromatic light source |
US4254455A (en) * | 1979-12-21 | 1981-03-03 | Pelton & Crane Company | Reflector for dental, medical or the like lighting device |
US4266535A (en) * | 1978-04-14 | 1981-05-12 | Les Produits Associes Bpa Sa | Diagnostic lamp |
US4292664A (en) * | 1978-08-17 | 1981-09-29 | Clairol Incorporated | Dental plaque disclosing light and method |
US4386292A (en) * | 1980-07-02 | 1983-05-31 | Gte Products Corporation | Projection lamp comprising single ended arc discharge lamp and an interference filter |
EP0120549A1 (en) * | 1982-04-28 | 1984-10-03 | John Anderson Oram | Lamp unit |
US4571665A (en) * | 1982-04-02 | 1986-02-18 | Espe Fabrik Pharmazeutischer Praeparate Gmbh | Apparatus for treating dental materials |
US4897772A (en) * | 1987-12-25 | 1990-01-30 | G-C Dental Industrial Corp. | Dental astral lamp |
US5003434A (en) * | 1988-09-30 | 1991-03-26 | Den-Tal-Ez, Inc. | Miniature hand-held spot source of illumination |
US5093769A (en) * | 1990-10-04 | 1992-03-03 | Luntsford K Paul | Surgical lighting system |
WO1994010499A1 (en) * | 1992-11-05 | 1994-05-11 | Cunningham David W | Lighting fixture |
US5728994A (en) * | 1993-11-05 | 1998-03-17 | Vari-Lite, Inc. | Laser ablation method for making a light pattern generator on a transparent substrate |
US6369964B1 (en) | 1998-09-04 | 2002-04-09 | General Scientific Corporation | Optical filters for reducing eye strain, during surgery |
US6890175B2 (en) | 2002-12-18 | 2005-05-10 | Ultradent Products, Inc. | Cooling system for hand-held curing light |
US6940659B2 (en) | 2002-01-11 | 2005-09-06 | Ultradent Products, Inc. | Cone-shaped lens having increased forward light intensity and kits incorporating such lenses |
US6994546B2 (en) | 2002-12-18 | 2006-02-07 | Ultradent Products, Inc. | Light curing device with detachable power supply |
US7056116B2 (en) | 2004-10-26 | 2006-06-06 | Ultradent Products, Inc. | Heat sink for dental curing light comprising a plurality of different materials |
US7074040B2 (en) | 2004-03-30 | 2006-07-11 | Ultradent Products, Inc. | Ball lens for use with a dental curing light |
US20060188836A1 (en) * | 1998-01-20 | 2006-08-24 | Kerr Corporation | Apparatus and method for curing materials with light radiation |
US7106523B2 (en) | 2002-01-11 | 2006-09-12 | Ultradent Products, Inc. | Optical lens used to focus led light |
US7144250B2 (en) | 2003-12-17 | 2006-12-05 | Ultradent Products, Inc. | Rechargeable dental curing light |
US7192276B2 (en) | 2003-08-20 | 2007-03-20 | Ultradent Products, Inc. | Dental curing light adapted to emit light at a desired angle |
US7195482B2 (en) | 2003-12-30 | 2007-03-27 | Ultradent Products, Inc. | Dental curing device having a heat sink for dissipating heat |
US20080106906A1 (en) * | 2006-11-07 | 2008-05-08 | Sheervision, Inc. | Clamp with movable light filter/lens/prism/diffuser |
US20100220490A1 (en) * | 2008-09-01 | 2010-09-02 | Timothy George Bushell | Light emitting device |
US20100254149A1 (en) * | 2009-04-02 | 2010-10-07 | Owen Gill | Curing light device |
EP2271872A1 (en) * | 2008-04-25 | 2011-01-12 | OSRAM Opto Semiconductors GmbH | Illumination unit |
US20140334132A1 (en) * | 2013-05-13 | 2014-11-13 | River Point, Llc | Medical Headlamp Optics |
US9072572B2 (en) | 2009-04-02 | 2015-07-07 | Kerr Corporation | Dental light device |
US10634330B1 (en) | 2017-10-31 | 2020-04-28 | Riverpoint Medical, Llc | Headband assembly |
US10690325B2 (en) | 2013-05-13 | 2020-06-23 | Riverpoint Medical, Llc | Medical headlamp optical arrangement permitting variable beam width |
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US1349706A (en) * | 1920-08-17 | Light-projecting lantern | ||
US2338901A (en) * | 1939-05-22 | 1944-01-11 | Chiti Aroldo | Vehicle lamp |
US2798943A (en) * | 1955-10-20 | 1957-07-09 | Gen Electric | Spotlight apparatus |
US2827554A (en) * | 1953-10-14 | 1958-03-18 | Gunther Franz | Operating table lamp |
US3113033A (en) * | 1960-05-16 | 1963-12-03 | Corning Glass Works | Light filter |
US3371202A (en) * | 1966-07-21 | 1968-02-27 | Wech Allyn Inc | Medical headlight |
-
1970
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US1349706A (en) * | 1920-08-17 | Light-projecting lantern | ||
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US2827554A (en) * | 1953-10-14 | 1958-03-18 | Gunther Franz | Operating table lamp |
US2798943A (en) * | 1955-10-20 | 1957-07-09 | Gen Electric | Spotlight apparatus |
US3113033A (en) * | 1960-05-16 | 1963-12-03 | Corning Glass Works | Light filter |
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Degenkolb, et al., Dichroic Safeguards, Journal of the S.M.P.T.E, Vol. 76, No. 1, Jan. 1967, pp. 15 17 * |
Cited By (48)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3930149A (en) * | 1974-05-28 | 1975-12-30 | Sterndent Corp | Variable intensity dental light |
US4195329A (en) * | 1975-11-28 | 1980-03-25 | Les Produits Associes Lpa Sa | Diagnostic lamp, particularly for checking teeth |
US4151584A (en) * | 1977-03-14 | 1979-04-24 | Electro Controls Inc. | Light-collecting reflector |
US4240133A (en) * | 1977-04-19 | 1980-12-16 | Gesellschaft fur Strahlen-und Umweltforschung mbH, Munchen | Quasimonochromatic light source |
US4266535A (en) * | 1978-04-14 | 1981-05-12 | Les Produits Associes Bpa Sa | Diagnostic lamp |
US4292664A (en) * | 1978-08-17 | 1981-09-29 | Clairol Incorporated | Dental plaque disclosing light and method |
US4234247A (en) * | 1978-10-30 | 1980-11-18 | Corning Glass Works | Method of making a reflector |
US4254455A (en) * | 1979-12-21 | 1981-03-03 | Pelton & Crane Company | Reflector for dental, medical or the like lighting device |
US4386292A (en) * | 1980-07-02 | 1983-05-31 | Gte Products Corporation | Projection lamp comprising single ended arc discharge lamp and an interference filter |
US4571665A (en) * | 1982-04-02 | 1986-02-18 | Espe Fabrik Pharmazeutischer Praeparate Gmbh | Apparatus for treating dental materials |
EP0120549A1 (en) * | 1982-04-28 | 1984-10-03 | John Anderson Oram | Lamp unit |
US4897772A (en) * | 1987-12-25 | 1990-01-30 | G-C Dental Industrial Corp. | Dental astral lamp |
US5003434A (en) * | 1988-09-30 | 1991-03-26 | Den-Tal-Ez, Inc. | Miniature hand-held spot source of illumination |
US5093769A (en) * | 1990-10-04 | 1992-03-03 | Luntsford K Paul | Surgical lighting system |
WO1994010499A1 (en) * | 1992-11-05 | 1994-05-11 | Cunningham David W | Lighting fixture |
US5345371A (en) * | 1992-11-05 | 1994-09-06 | Cunningham David W | Lighting fixture |
US5446637A (en) * | 1992-11-05 | 1995-08-29 | Cunningham; David W. | Lighting fixture |
US5728994A (en) * | 1993-11-05 | 1998-03-17 | Vari-Lite, Inc. | Laser ablation method for making a light pattern generator on a transparent substrate |
US5959768A (en) * | 1993-11-05 | 1999-09-28 | Vari-Lite, Inc. | Light pattern generator formed on a transparent substrate |
US8568140B2 (en) | 1998-01-20 | 2013-10-29 | Jozef Kovac | Apparatus and method for curing materials with radiation |
US9622839B2 (en) | 1998-01-20 | 2017-04-18 | Kerr Corporation | Apparatus and method for curing materials with radiation |
US20060188836A1 (en) * | 1998-01-20 | 2006-08-24 | Kerr Corporation | Apparatus and method for curing materials with light radiation |
US20070231769A1 (en) * | 1998-01-20 | 2007-10-04 | Jozef Kovac | Apparatus and method for curing materials with radiation |
US9572643B2 (en) | 1998-01-20 | 2017-02-21 | Kerr Corporation | Apparatus and method for curing materials with radiation |
US6369964B1 (en) | 1998-09-04 | 2002-04-09 | General Scientific Corporation | Optical filters for reducing eye strain, during surgery |
US6940659B2 (en) | 2002-01-11 | 2005-09-06 | Ultradent Products, Inc. | Cone-shaped lens having increased forward light intensity and kits incorporating such lenses |
US7106523B2 (en) | 2002-01-11 | 2006-09-12 | Ultradent Products, Inc. | Optical lens used to focus led light |
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