US20040071412A1 - Optical connector, optical element holding structure, and structure of a mount section of an optical connector - Google Patents
Optical connector, optical element holding structure, and structure of a mount section of an optical connector Download PDFInfo
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- US20040071412A1 US20040071412A1 US10/681,301 US68130103A US2004071412A1 US 20040071412 A1 US20040071412 A1 US 20040071412A1 US 68130103 A US68130103 A US 68130103A US 2004071412 A1 US2004071412 A1 US 2004071412A1
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Images
Classifications
-
- 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
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4274—Electrical aspects
- G02B6/4277—Protection against electromagnetic interference [EMI], e.g. shielding means
-
- 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
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4219—Mechanical fixtures for holding or positioning the elements relative to each other in the couplings; Alignment methods for the elements, e.g. measuring or observing methods especially used therefor
- G02B6/4236—Fixing or mounting methods of the aligned elements
- G02B6/4245—Mounting of the opto-electronic elements
-
- 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
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4266—Thermal aspects, temperature control or temperature monitoring
- G02B6/4268—Cooling
- G02B6/4269—Cooling with heat sinks or radiation fins
-
- 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
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4292—Coupling light guides with opto-electronic elements the light guide being disconnectable from the opto-electronic element, e.g. mutually self aligning arrangements
-
- 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
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4256—Details of housings
- G02B6/426—Details of housings mounting, engaging or coupling of the package to a board, a frame or a panel
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
An optical connector is constituted of a connector housing, a shielding case, and optical elements. The shielding case is split into a case main body section and a heatsink mechanism section, both joined together to constitute housing recesses. While the case main body section and the heatsink mechanism section are joined together, element main body sections are held between them. A non-joint plane of the heatsink mechanism section is housed in a case housing recess of the connector housing in an outwardly exposed state. A corrugated heatsink fin section is formed in the non-joint plane. The housing, recesses into which the element main body sections are to be housed are partitioned from each other.
Description
- 1. Field of Invention
- The present invention relates to an optical connector, an optical element holding structure, and a structure of a mount section of an optical connector to be employed in the field of optical communication such as that used in office automation, factory automation, and vehicle-mounted equipment.
- 2. Description of Related Art
- An optical connector which is to be fixedly mounted on a mount board while incorporating optical elements has been improved in terms of a noise resistance characteristic of optical elements for withstanding external noise. In order to suppress radiation noise origination from the optical elements, the optical elements are built into a connector housing while being housed in a shielding shell made of highly conductive material, such as metal.
- FIGS. 31 and 32 show conceivable constructions for grounding a shielding shell of an optical connector of this type.
- In an
optical connector 101 shown in FIG. 31, alead terminal 106 is provided at right angles on ashielding shell 102 for sheathing an optical element D, so as to project downward beyond aconnector housing 105. While theoptical connector 101 is mounted on amount board 108, thelead terminal 106 penetrates through themount board 108 and is soldered to a trace formed on a lower surface of themount board 108 for grounding purposes. As a result, theshielding shell 102 is grounded by way of thelead terminal 106. - The technique described in Japanese Patent Publication No. Hei. 5-3330 is exemplary of a related-art technology analogous to that mentioned above.
- In an
optical connector 110 shown in FIG. 32,ground tab pieces 113 are formed on both sides of ashielding shell 112 so as to jut outward from both sides of a main body section of aconnector housing 115. Theoptical connector 110 is fixedly mounted on amount board 118 such that thetab pieces 113 are brought, in an overlapped manner, into plane contact withground traces 119 formed on an upper surface of themount board 118. As a result, theshielding shell 112 is grounded by way of thetab pieces 113. - However, in the case of the
optical connector 101 shown in FIG. 31, theshielding shell 102 is merely grounded by way of the pin-shaped lead terminal 106. Hence, high ground resistance arises, and an insufficient electromagnetic shielding effect is achieved. - Moreover, in this related-art and the similar related-art thereof, an optical element is fittingly inserted into a housing recess formed in a metal case; an opening of the housing recess is formed so as to become slightly larger than the element main body so that the element main body of the optical element can be fitted into the recess.
- Accordingly, there is a chance of a slight clearance arising between an interior surface of the housing recess of the metal case and an exterior surface of the element main body. Such a clearance may, in turn, cause a drop in heat transfer efficiency.
- In the case of the
optical connector 110 shown in FIG. 32, thetab pieces 113 are brought into plane contact with theground traces 119. Hence, low ground resistance arises, and a sufficient electromagnetic shielding effect is achieved. However, theground tab pieces 113 significantly jut outward from both sides of the main body section of theconnector housing 115. Hence, it becomes necessary to use a large area for fixedly mounting theconnector 101. - The present invention has been conceived in light of the above problems and is aimed at providing an optical connector and an optical element holding structure which are superior in countermeasures against heat as well as against noise.
- Another aim of the present invention is to provide a structure to be used for mounting an optical connector and provision of an optical connector, which enable minimizing of ground resistance of a shielding shell and minimizing of an area required for mounting an optical connector.
- The first aspect of this invention is an optical connector including: a conductive shielding case which is to be used for connection with a ground circuit and has a housing recess; an element main body section of an optical element to be fittingly housed into the housing recess; lead terminals of the optical element which are arranged so as to project from the housing recess; and a connector housing having a case housing recess into which the shielding case is to be housed, wherein the shielding case is formed in a split structure from a casing main body section and a closure section, which constitute the housing recess when joined together; and wherein, while the case main body section and the closure section are joined together, the element main body section is placed in the housing recess and sandwiched and held between the case main body section and the closure section.
- A non-joint plane opposite to a joint plane of the closure section to be connected to the case main body section may be housed in the connector housing in an outwardly exposed state, and a corrugated heatsinking fin section may be provided in the non-joint plane.
- The optical element may be embodied as a plurality of optical elements, and housing recesses into which the optical elements are to be housed may be formed in the case main body section independently and side by side while being partitioned from each other.
- The case main body section and the closure section may be formed from metal material or conductive resin.
- Another aspect of this invention is an optical connector in which the element main body sections of the optical elements are housed in housing recesses formed in a connector housing and in which lead terminals of the optical elements project from the housing recesses, wherein the connector housing is made of a conductive material and is formed in a split structure from a housing main body section and a closure section, which constitute the housing recesses when joined together; and wherein, while the housing main body section and the closure section are joined together, the element main body sections are placed in the housing recesses and sandwiched and held between the case main body section and the closure section.
- Preferably, a corrugated heatsink fin is formed in a non-joint plane of the closure section opposite a joint plane thereof to be joined to the housing main body section.
- Further, the closure section may be formed from metal material.
- Another aspect of this invention is an optical element holding structure of a shielding case including:a case main body section of the shielding case to be housed into a case housing recess formed in a connector housing of an optical connector; an element main body section of an optical element which is to be fitted into the case main body section; and lead terminals of the optical element which are held while projecting from the case main body section, the structure comprising: a thermal conductive material assuming the form of a gel or liquid which is filled and poured into a clearance existing between an internal circumferential surface of the case main body section and an outer circumferential surface of the element main body section, exclusive of the position of a window for optical communication formed in the case main body section, and which is set.
- Alternatively, the technical means may be embodied as an optical element holding structure of a shielding case including: a case main body section of the shielding case to be housed into a case housing recess formed in a connector housing of an optical connector; an element main body section of an optical element which is to be fitted into the case main body section; and lead terminals of the optical element which are held while projecting from the case main body section, the structure comprising: a spring piece section which is provided integrally on or separately from at least one side surface of an internal circumferential surface of a case main body section and which presses an element main body section against another side surface of the internal circumferential surface.
- Preferably, the spring piece section is provided at a position on the internal circumferential surface opposite to the window formed in the case main body section.
- Preferably, a portion of the element main body section to be pressed by the spring piece section is situated in the vicinity of a heat source of an element main body section.
- Further preferably, the spring piece section is provided in the case main body section in a collapsed and extended manner by way of an opening edge of the case main body section into which the element main body section is to be fitted.
- Preferably, a clearance existing between an internal circumferential surface of a case main body section and an outer circumferential surface of an element main body section, exclusive of the position of an optical communication window formed in the case main body section, is filled with thermal conductive material assuming the form of a gel or liquid, and the thus-filled thermal conductive material is set.
- Further preferably, an elastic member is interposed in a compressed state in a clearance existing between an internal circumferential surface of a case main body section and an outer circumferential surface of an element main body section, exclusive of the position of an optical communication window formed in the case main body section.
- Another aspect of this invention is a structure of a mount section of an optical connector including: a connector housing in which a housing recess section is formed so as to open in a bottom surface; and a metal shielding shell having an element housing case section which is housed and arranged in the housing recess section while holding an optical element therein, the mount section comprising: a plate-shaped grounding piece which is provided so as to extend along the bottom surface of the connector housing and is formed integrally in the element housing case section; and a ground trace which is formed on the mount board and with which the grounding piece is electrically connected as a result of the grounding piece being interposed between the connector housing and one surface of the mount board while the optical connector is fixedly mounted on the one surface of the mount board.
- According to another aspect of the invention, the metal shielding shell may have a heatsink section, at least a part of which is exposed outside of the connector housing, and the grounding piece may act as a member for joining the element housing case to the heatsink section at a bottom surface side of the connector housing.
- According to another aspect of the invention, the grounding piece may be in plane contact with a ground trace formed on the one surface of the mount board.
- According to another aspect of the invention, a screw may be inserted into the mount board and the grounding piece from the other side of the mount board and screw-engaged with the connector housing through fastening.
- According to another aspect of the invention, a metal screw may be inserted into the mount board and the grounding piece from the other side of the mount board and screw-engaged with the connector housing through fastening while remaining in electrical connection with the ground trace formed on the other side of the mount board and in electrical connection with the grounding piece.
- Another aspect of the invention is an optical connector comprises: a connector housing in which a housing recess section is formed so as to open in a bottom surface; a metal shielding shell having an element housing case section which is housed and arranged in the housing recess section while holding an optical element therein; and a plate-shaped grounding piece which is provided so as to extend along the bottom surface of the connector housing and is electrically connectable to a ground trace formed on the mount board, the grounding piece being formed integrally in the element housing case section.
- FIG. 1 is an exploded perspective view of an optical connector according to an embodiment of the invention;
- FIG. 2 is a descriptive view showing assembly of a shielding case;
- FIG. 3 is a side view showing an assembled state of the shielding case;
- FIG. 4 is an exploded perspective view of an optical connector according to an embodiment of the invention;
- FIG. 5 is a descriptive view showing assembly of a connector housing;
- FIG. 6 is a side view showing an assembled state of the connector housing;
- FIG. 7 is a front view showing a shielding case holding an optical element according to a first embodiment of the invention;
- FIG. 8 is a rear view of the shielding case;
- FIG. 9 is a right side view of the shielding case shown in FIG. 7;
- FIG. 10 is a plan view of the shielding case shown in FIG. 7;
- FIG. 11 is a bottom view of the shielding case shown in FIG. 7;
- FIG. 12 is a cross-sectional view taken along line12-12 shown in FIG. 8;
- FIG. 13 is a cross-sectional view taken along line13-13 shown in FIG. 8;
- FIG. 14 is a cross-sectional view taken along line14-14 shown in FIG. 10;
- FIG. 15 is a cross-sectional view taken along line15-15 shown in FIG. 10;
- FIG. 16 is a descriptive view showing a mounted state of an optical connector;
- FIG. 17 is a front view of a shielding case holding an optical element according to a second embodiment of the invention;
- FIG. 18 is a rear view of the shielding case shown in FIG. 17;
- FIG. 19 is a right side view of the shielding case shown in FIG. 17;
- FIG. 20 is a plan view of the shielding case shown in FIG. 17;
- FIG. 21 is a bottom view of the shielding case shown in FIG. 17;
- FIG. 22 is a cross-sectional view taken along line22-22 shown in FIG. 18;
- FIG. 23 is a cross-sectional view taken along line23-23 shown in FIG. 18;
- FIG. 24 is a cross-sectional view taken along line24-24 shown in FIG. 20;
- FIG. 25 is a cross-sectional view taken along line25-25 shown in FIG. 20;
- FIG. 26 is a cross-sectional view showing the construction of a mount section of an optical connector according to an embodiment of the invention;
- FIG. 27 is a perspective view showing a metal shielding shell according to the optical connector;
- FIG. 28 is a cross-sectional view showing the construction of a mount section of an optical connector according to a first modification;
- FIG. 29 is a cross-sectional view showing the construction of a mount section of an optical connector according to a second modification;
- FIG. 30 is a plot showing results of an immunity test;
- FIG. 31 is an exploded perspective view showing a first background art; and
- FIG. 32 is an exploded perspective view showing a second background art.
- An embodiment of the invention will be described hereinbelow by reference to the accompanying drawings. As shown in FIGS. 1 through 3, an
optical connector 1 is primarily constituted of, e.g., resin having an insulation characteristic; ashielding case 3 made of metal material having conductivity, such as aluminum or an aluminum alloy; and a light-emittingelement 4 and a light-receivingelement 5, which act as optical elements and are paired with each other. - The
shielding case 3 is formed in the shape of a substantially-rectangular parallelepiped. The shieldingcase 3 has a two-way split structure consisting of a casemain body section 8 and aheatsink mechanism section 9. Housing recesses 7—into which are formed a rectangularly-parallelepiped elementmain body section 4 a of the light-emittingelement 4 and a rectangularly-parallelepiped elementmain body section 5 a of the light-emittingelement 5—are formed side by side in the casemain body section 8 with reference to a widthwise direction thereof while being partitioned independently from each other. Theheatsink mechanism section 9 acts as a closure section to be attached to the casemain body section 8 from its back in order to close rear opening sections of therespective housing recesses 7 in the casemain body section 8. - While the element
main body section 4 a of theoptical element 4 and the elementmain body section 5 a of theoptical element 5 are fitted into therespective housing recesses 7 of the casemain body section 8,lead terminals 4 b of theoptical element 4 and leadterminals 5 b of theoptical element 5 project downward from therespective housing recesses 7. While the elementmain body sections respective housing recesses 7.Window sections 7 a are formed in the casemain body section 8 so as to correspond to a light-emitting plane provided on the front side of the elementmain body section 4 a and a light-receiving plane provided in the front side of the elementmain body section 5 a. - A flat
mount piece section 8 a is projectingly formed in a lower end section on either side surface of the casemain body section 8. Ascrew insertion hole 8 b is formed in eachmount piece section 8 a. - A front surface of the
heatsink mechanism section 9; namely, ajoint plane 9 a to be connected to the rear surface of the casemain body section 8, is formed into the shape of a flat plane. Trenchsections 10 are formed in a rear surface of theheatsink mechanism section 9; that is, anon-joint plane 9 b opposite to thejoint plane 9 a, so as to become spaced apart from each other at appropriate intervals in a widthwise direction and extend vertically, thus constituting acorrugated heatsink fin 11. - A plate-like
mount piece section 9 c is projectingly formed at a lower position on either side surface of theheatsink mechanism section 9. When theheatsink mechanism section 9 is attached to the casemain body section 8, themount piece sections 9 c are superimposed on respective upper surfaces of themount piece sections 8 a. Ascrew insertion hole 9 d to be brought into communication with the correspondingscrew insertion hole 8 b is formed in each of themount piece sections 9 c. - The depth S of each
housing recess 7 is set so as to become slightly smaller than the cross directional thickness “t” of each of the elementmain body sections main body sections corresponding housing recesses 7 in a sandwiched manner while thejoint plane 9 a of theheatsink mechanism section 9 is fitted into the back of the casemain body section 8. - A
case housing recess 13 opens rearward in the back of theconnector housing 2. The casemain body section 8 of the shieldingcase 3 is fitted into thecase housing recess 13. Further, mountpiece sections 2 a are projectingly formed at lower positions on respective rear side surfaces of theconnector housing 2, wherein themount piece sections 2 a are to be superimposed on respective upper surfaces of themount pieces 9 a of theheatsink mechanism section 9. Female thread holes 2 b are formed in the respectivemount piece sections 2 a so as to be brought into communication with the respectivescrew insertion holes 8 b and thescrew insertion holes 9 d. - Cylindrical
ferrule guide sections 14 are formed in theconnector housing 2 so as to be brought into communication with therespective window sections 7 a while the casemain body section 8 of theshield case 2 is fitted into thecase housing recess 13. - The embodiment has been constructed in the foregoing manner. When the
optical connector 1 is mounted on thecircuit board 16, the elementmain body sections optical elements respective housing recesses 7 of the casemain body section 8. Further, while thejoint plane 9 a of theheatsink mechanism section 9 is joined to the back of the casemain body section 8 and while the casemain body section 8 is fitted into thecase housing recess 13 of theconnector housing 2, thelead terminals circuit board 16. Further, a lower surface of theshield case 3 is placed at a predetermined location while remaining in plane contact with a ground circuit of thecircuit board 16. - In this state, fastening screws are sequentially inserted, from below the lower surface of the
circuit board 16, into screw insertion holes 16 a formed in thecircuit board 16, thescrew insertion holes 8 b formed in themount piece sections 8 a, and thescrew insertion holes 9 d of themount piece sections 9 c, and screw-engaged with thefemale thread holes 2 b of themount piece sections 2 a. As a result, theconnector housing 2, the shieldingcase 3, and theoptical elements circuit board 16. - At this time, the depth “S” of each
housing recess 7 is slightly smaller than the cross directional thickness “t” of each of the elementmain body sections optical elements main body section 8 is connected to theheatsink mechanism section 9, theoptical elements main body section 8 and theheatsink mechanism section 9. - As mentioned above, according to the embodiment, the element
main body sections optical elements respective housing recesses 7 formed in theshielding case 3 made of metal material; that is, a combination of the casemain body section 8 and theheatsink mechanism section 9. Hence, the elementmain body sections main body section 8, and theheatsink mechanism section 9 can be retained tightly without involvement of clearance, thereby enabling efficient heat transfer and heatsinking. Further, the casemain body section 8 and theheatsink mechanism section 9 are held in plane contact with the ground circuit, thus realizing a superior shielding effect. Moreover, there is an advantage of superior countermeasures against noise and heat are yielded. - Since the influence of heat and noise can be lessened, the
optical connector 1 can use a light-emittingelement 4 and light-receivingelement 5. - Further, the
heatsink fin section 11 of theshield case 3 is housed and retained in theconnector housing 2 in an outwardly-exposed manner. Theheatsink fin section 11 enables more efficient radiation. Even in this regard, the optical connector is superior in measures against heat. - Further, since the
housing recesses 7 are formed independently, therespective housing recesses 7 can hold the elementmain body sections main body sections respective housing recesses 7. Even in this regard, there is yielded an advantage of the ability to achieve superior countermeasures against noise and heat. - Further, fastening screws are sequentially inserted into the screw insertion holes16 a formed in the
circuit board 16, the screw insertion holes 7 b of themount piece sections 8 a, and thescrew insertion holes 9 d formed in themount piece sections 9 c and screw-engaged with thefemale thread holes 2 b of themount piece sections 2 a. As a result, theconnector housing 2, the shieldingcase 3, and theoptical elements circuit board 16. Hence, theconnector housing 2 is superior even in ease of assembly. - In this embodiment, the case
main body section 8 and theheatsink mechanism 9 are respectively made of metal material. Alternatively, the casemain body section 8 and theheatsink mechanism section 9 may be made of conductive resin. In this case, theoptical elements respective housing recesses 7 in a sandwiched manner by means of elastic action of plastic and superior holding force. Further alternatively, either the casemain body section 8 or theheatsink mechanism section 9 may be formed from conductive resin. - The embodiment shows that the
optical elements - The
connector housing 2, the casemain body section 8, and theheatsink mechanism section 9 are fastened to thecircuit board 16 with fastening screws. As a result, they are mounted and fixed on thecircuit board 16 in one piece. Alternatively, the casemain body section 8 and theheatsink mechanism section 9 may be fastened together beforehand, after which the thus-fixedshielding case 3 is housed in thecase housing recess 13 of theconnector housing 2. Theconnector housing 2 may be mounted on thecircuit board 16. - Further, the case
main body section 8 is shown as having the housing recesses 7. Alternatively, theheatsink mechanism section 9 may have the housing recesses 7. Further alternatively, recesses may be formed in theheatsink mechanism section 9 as well as in the casemain body section 8 such that thehousing recesses 7 are formed when they are joined together. - As has been described, according to an optical connector of the invention, a shielding case is formed in a split manner from a case main body section and a closure section, which constitute a housing recess when joined together. When the case main body section and the closure section are joined together, an element main body section of an optical element is situated in the housing recess and retained and sandwiched between the case main body section and the closure section. Thus, the optical element can be held tightly without involvement of clearance. There is yielded an advantage of efficient heat transfer, efficient heatsinking, and superior countermeasures against noise and heat.
- A non-joint plane opposite to a joint plane of the closure section to be connected to the case main body section is to be housed in the connector housing in an outwardly exposed state. A corrugated heatsinking fin section is provided in the non-joint plane. Even in this regard, there is yielded an advantage of superior countermeasures against heat.
- The optical element is embodied as a plurality of optical elements, and housing recesses into which the optical elements are to be housed are formed in the case main body section independently and side by side while being partitioned from each other. Such a structure yields an advantage of the ability to realize independent shielding and much superior countermeasures against noise and heat.
- When the case main body section and the closure section are formed from metal material, there is yielded an advantage of superior heatsinking. In contrast, when they are made of conductive resin, there is yielded an advantage of the ability to generate superior clamping force.
- An embodiment of the invention will be described hereinbelow by reference to the accompanying drawings. As shown in FIGS. 4 through 6, an
optical connector 201 is primarily constituted of aconnector housing 202 which is formed from conductive material, e.g., metal material such as aluminum or an aluminum alloy; and a light-emittingelement 203 and a light-receivingelement 204, which act as optical elements and are paired with each other. - The
connector housing 202 is formed in the shape of a substantially-rectangular parallelepiped. Theconnector housing 202 has a two-way split structure consisting of a housingmain body section 207 and aheatsink mechanism section 209. Housing recesses 206—into which are formed a rectangularly-parallelepiped elementmain body section 203 a of the light-emittingelement 203 and a rectangularly-parallelepiped elementmain body section 204 a of the light-emittingelement 204—are formed side-by-side in the housingmain body section 207 with reference to a widthwise direction thereof while being partitioned separately from each other. Theheatsink mechanism section 209 acts as a closure section to be attached to the housingmain body section 207 from its back in order to close rear opening sections of therespective housing recesses 206 in the housingmain body section 207. - While the element
main body section 203 a of theoptical element 203 and the elementmain body section 204 a of theoptical element 204 are fitted into therespective housing recesses 206 of the housingmain body section 207,lead terminals 203 b of theoptical element 203 andlead terminals 204 b of theoptical element 204 project downward from the respective housing recesses 206. While the elementmain body sections respective housing recesses 206,cylindrical ferrules 211 are formed in the housingmain body 207 so as to correspond to a light-emitting plane provided on the front side of the elementmain body section 203 a and a light-receiving plane provided on the front side of the elementmain body section 204 a. - Two-stage
mount piece sections main body section 207. Uppermount piece sections 207 a are formed into the shape of plates, and female thread holes 207 c are formed in the respective uppermount piece sections 207 a. The lowermount piece sections 207 b are formed so as to assume a substantially U-shaped cross-sectional profile when viewed from the bottom. Fastening screws to be screwed into the female thread holes 207 c can be inserted by way of U-shaped spaces. - A front surface of the
heatsink mechanism section 9; namely, a joint plane 209 a to be connected to the rear surface of the housingmain body section 207, is formed into the shape of a flat plane.Trenches 213 are formed in a rear surface of theheatsink mechanism section 9; that is, anon-joint plane 209 b opposite the joint plane 209 a, so as to become spaced apart from each other at appropriate intervals in a widthwise direction and extend vertically, thus constituting acorrugated heatsink fin 214. - A plate-like
mount piece section 209 c is projectingly formed at a lower position on either side surface of theheatsink mechanism section 209. When theheatsink mechanism section 209 is attached to the housingmain body section 207, themount piece sections 209 c are fitted into corresponding spaces, each being defined between the upper and lowermount piece sections screw insertion hole 209 d to be brought into communication with thefemale thread hole 207 c is formed in each of themount piece sections 209 c. - The depth S of each
housing recess 206 is set so as to become slightly smaller than the cross directional thickness “t” of each of the elementmain body sections main body sections corresponding housing recesses 206 in a sandwiched manner while the joint plane 209 a of theheatsink mechanism section 209 is fitted into the back of the housingmain body section 207. - The embodiment has been constructed in the foregoing manner. When the
optical connector 201 is mounted on acircuit board 216, the elementmain body sections optical elements respective housing recesses 206 of the housingmain body section 207. Further, while the joint plane 209 a of theheatsink mechanism section 209 is joined to the back of the housingmain body section 207, thelead terminals circuit board 216. A lower surface of the housingmain body section 207 and/or a lower surface of theheatsink mechanism section 209 are/is placed at a predetermined location(s) while remaining in plane contact with a ground circuit of thecircuit board 216. - In this state, fastening screws are sequentially inserted, from below the lower surface of the
circuit board 216, into screw insertion holes 216 a formed in thecircuit board 216, the spaces of themount piece sections 207 b, and the screw insertion holes 209 d formed in themount piece sections 209 c and screw-engaged with the female thread holes 207 c of themount piece sections 207 a. As a result, the housingmain body section 207 and theheatsink mechanism section 209 are fixedly mounted in one piece on thecircuit board 216. - At this time, the depth “S” of each
housing recess 206 is slightly smaller than the cross directional thickness “t” of each of the elementmain body sections optical elements main body section 207 is connected to theheatsink mechanism section 209, theoptical elements main body section 207 and theheatsink mechanism section 209. - As mentioned above, according to the embodiment, the element
main body sections optical elements respective housing recesses 206 formed in theconnector housing 202 made of metal material; that is, a combination of the housingmain body section 207 and theheatsink mechanism section 209. Hence, the elementmain body sections main body section 207, and theheatsink mechanism section 209 can be retained tightly without involvement of clearance, thereby enabling efficient heat transfer and heatsinking. Theconnector housing 202 according to the embodiment does not involve retention of heat and enables heatsinking of theoverall connector housing 202. Even in this regard, theconnector housing 202 is superior to a related-art connector housing in which optical elements are housed in a metal case and the metal case is housed further in a plastic housing. - The
connector housing 202 has a structure in which the housingmain body section 207 and/or theheatsink mechanism 209 are held in plane contact with a ground circuit. Hence, theconnector housing 202 yields an advantage of the ability to achieve a superior shielding effect, superior countermeasures against noise and heat, and obviation of a metal case, which is required in the related art. - Since the influence of heating and noise can be lessened, the
optical connector 201 can use the light-emittingelement 203 and the light-receivingelement 204, which operate at faster speed. - Further, the
heatsink fin 214 of theshield case 203 enables more efficient heatsinking. Even in this regard, theconnector housing 202 is superior in countermeasures against heat. - The geometry of the
heatsink fin 214 is changed appropriately in accordance with the amount of heat generated by theoptical elements connector housing 202. Thus, there is also yielded an advantage of the ability to effect adjustment so as to achieve a desired amount of heat to be dissipated. - Further, since the
housing recesses 206 are formed independently, therespective housing recesses 206 can hold the elementmain body sections main body sections - Further, fastening screws are sequentially inserted, from below the lower surface of the
circuit board 216, into the screw insertion holes 216 a formed in thecircuit board 216, the spaces of themount piece sections 207 b, and the screw insertion holes 209 d formed in themount piece sections 209 c and screw-engaged with the female thread holes 207 c of themount piece sections 207 a. As a result, theconnector housing 202 and theoptical elements circuit board 216. Hence, theconnector housing 202 is superior even in ease of assembly. - In the embodiment, the housing
main body section 207 and theheatsink mechanism 209 are made of metal material. Alternatively, the housingmain body section 207 and theheatsink mechanism section 209 may be made of conductive resin. In this case, theoptical elements respective housing recesses 206 in a sandwiched manner by means of elastic action of plastic and superior holding force. Further alternatively, either the housingmain body section 207 or theheatsink mechanism section 209 may be formed from conductive resin. In this case, even in terms of a heatsinking characteristic, theheatsink mechanism section 209 having theheatsink fin 214 is preferably formed from metal material. Furthermore, the housingmain body section 207 may be imparted with conductivity, by means of plating the surface of the housingmain body section 207 with metal. - The embodiment shows that the
optical elements - The housing
main body section 207 and theheatsink mechanism section 209 are fastened to thecircuit board 216 with fastening screws. As a result, they are mounted and fixed on thecircuit board 216 in one piece. Alternatively, the housingmain body section 207 and theheatsink mechanism section 209 may be fastened together beforehand, and the thus-fixedconnector housing 202 may be mounted and fixed on thecircuit board 216. - Further, the housing
main body section 207 is shown as having the housing recesses 206. Alternatively, theheatsink mechanism section 209 may have the housing recesses 206. Further alternatively, recesses may be formed in theheatsink mechanism section 209 as well as in the housingmain body section 207 such that thehousing recesses 206 are formed when they are joined together. - As has been described, according to an optical connector of the invention, a connector housing is formed from conductive material. Further, the connector housing is formed in a split manner from a housing main body section and a closure section, which constitute housing recesses when joined together. When the housing main body section and the closure section are joined together, element main body sections are situated in the housing recesses and retained and sandwiched between the housing main body section and the closure section. Thus, the optical elements can be held tightly without involvement of clearance, thus yielding an advantage of efficient heat transfer, efficient heatsinking, and superior countermeasures against noise and heat.
- A corrugated heatsinking fin section is provided in a non-joint plane of the closure section opposite a joint plane thereof to be connected to the housing main body section. Even in this regard, there is yielded an advantage of superior countermeasures against heat.
- If the closure section is formed from metal material, there is yielded an advantage of superior heat conductivity and heatsinking characteristic.
- A first modification of this embodiment will be described hereinbelow by reference to the drawings. As shown in FIG. 16, an
optical connector 301 is constituted primarily of ashielding case 303 capable of housing an elementmain body section 302 a of anoptical element 302 made of a light-emitting element or a light-receiving element; and aconnector housing 305 which is formed from insulating resin and has a casehousing recess section 304 for housing and holding the shieldingcase 303. - The number of
optical elements 302 to be housed in theoptical connector 301 is not limited to one, and may be two or more, as required. - As shown in FIGS. 7 through 15, the shielding
case 303 is formed by means of punching and folding a conductive material; e.g., a plate material made of metal material such as brass, phosphor bronze, stainless steel, or German silver (nickel silver). The shieldingcase 303 has a casemain body section 307 capable of housing an elementmain body section 302 a of theoptical element 2; and leadsections 308 extending downward from the casemain body section 307. - The case
main body section 307 is formed into a substantially box-shaped form, and an opening is formed in a bottom of the casemain body section 307. When the elementmain body section 302 a of the optical element is fitted into the casemain body section 307 from the opening, the entirety of the elementmain body section 302 a is housed and arranged in the casemain body section 307. In this state, the entirety of the elementmain body section 302 a is covered with the casemain body section 307. By means of grounding thelead sections 308, as required, theoptical element 302 is electromagnetically shielded. For example, thelead sections 308 are grounded by means of soldering thelead sections 308 to aground circuit 311 formed on acircuit board 310. - A horizontally-elongated
window section 307 a for optical communication purpose is formed in a front surface side of the casemain body section 307. A light-receiving or light-emitting plane provided in a front surface side of the elementmain body section 302 a faces the outside by way of thewindow section 307 a. When the shieldingcase 303 is fittingly housed in thecase housing recess 304 of theconnector housing 305, acylindrical ferrule 313 is formed at a position on theconnector housing 305 corresponding to the position of thewindow 307 a of the casemain body section 307. - The leads308 are formed so as to extend downward from the peripheral edge of the opening formed in the bottom of the case
main body section 307. - Positioning bumps307 b are formed on a front wall section, a rear wall section, and side wall sections of the case
main body section 307 so as to bulge toward the inside of the casemain body section 307. When the elementmain body section 302 a of theoptical element 302 is fitted into the casemain body section 307, the elementmain body section 302 a can be retained at a predetermined position within the casemain body section 307. - While the element
main body section 302 a is housed in the casemain body section 307,lead terminals 302 b extending downward from the elementmain body section 302 a extend downward from the opening formed in the bottom of the casemain body section 307. Therespective lead terminals 302 b can be soldered to a predetermined trace formed on thecircuit board 310. - While the element
main body section 302 a is positioned in the casemain body section 307, a clearance existing between an internal circumferential surface of the casemain body section 307 and an outer circumferential surface of the elementmain body section 302 a, except for the position of thewindow 307 a, is filled with thermalconductive material 315 which is a gel or a liquid, has a superior heat transfer characteristic, and sets under certain temperature conditions. Accordingly, the elementmain body section 302 a is fixedly held in the casemain body section 307 without involvement of a clearance. - As the thermal
conductive material 315 to be used for filling, there is employed, e.g., a material made by means of mixing a metal filler or aluminum powder into silicon, or a material made by means of mixing, into silicon, a conductive powder, such as carbon powder or a metal filler, and magnetic powder, such as ferrite or Sendust. - Preferably, during the step filling the clearance with the thermal
conductive material 315, the position of thewindow section 307 a and the position of a light-receiving or light-emitting plane of the elementmain body section 302 a are temporarily covered with an elastic material so as to prevent attachment of the thermalconductive material 315 to these positions. Alternatively, walls may be set around the positions, thereby preventing entry of the thermalconductive material 315 into the light-receiving or light-emitting plane. - Since the present modification is embodied in the manner described previously, when the
optical connector 301 is fixedly mounted on thecircuit board 310, the elementmain body section 302 a of theoptical element 302 is fittingly housed in the casemain body section 307 of the shieldingcase 303 beforehand, and the clearance is filled with the thermalconductive material 315. In a state in which the thus-filled thermal conductive material has set and fixedly holds the elementmain body section 302 a, the casemain body section 307 is fitted into thecase housing recess 304 of theconnector housing 305. Therespective lead terminals 302 b are inserted into insertion holes formed in predetermined circuit traces of thecircuit board 310. Thelead sections 308 are inserted into theground circuit 311 and placed at predetermined positions. Theoptical connector 301 is mounted on and fixed to thecircuit board 310 by way of unillustrated screw sections provided on both sides of theconnector housing 305. At this time, thelead terminals 302 b and thelead sections 308 are connected to predetermined circuits by means of soldering. - Here, the element
main body section 302 a of theoptical element 302 is housed in theshielding case 303 and has superior resistance to noise. - The heat developing in the element
main body section 302 a of theoptical element 302 escapes to the outside by way of the casemain body section 7. At this time, the clearance existing between the internal circumferential surface of the casemain body section 307 and the outer circumferential surface of the elementmain body section 302 a is filled with the thermalconductive material 315 which is superior in heat conductivity to air. Hence, the heat developing in the elementmain body section 302 a is efficiently transferred to the casemain body section 307 by way of the thermalconductive material 315. Thus, theoptical connector 301 is superior in heat transfer characteristic. - Since the
optical connector 301 is superior in noise resistance and heatsink characteristics, theoptical element 302 can be stably activated at a higher speed (i.e., a higher frequency). - So long as a conductive, magnetic, and elastic material (i.e., an elastic material having conductivity and magnetic properties) is used as the thermal
conductive material 315, the following effects are yielded. - In the
shielding case 303 housing theoptical element 302, a light-emitting or light-receiving plane of theoptical element 302 faces the outside. Hence, awindow section 307 a becomes indispensable. However, an eddy current develops in a conductive portion of the edge of thewindow 307 a because of external noise, and the eddy current induces radiation of an electromagnetic wave. Further, theoptical element 302 per se produces an electromagnetic wave. Particularly, an electromagnetic wave stemming from activation of theoptical element 302 at high frequency is subjected to irregular reflection in an internal space within the casemain body section 307. - Conductivity and a magnetic property are imparted to the thermal
conductive material 315, thereby absorbing a radiated electromagnetic wave stemming from the eddy current that has developed in the peripheral edge of thewindow section 307 a. Further, the electromagnetic wave generated by theoptical element 302 is also absorbed, thereby preventing occurrence of irregular reflection. Particularly, a magnetic property is imparted to the thermalconductive material 315, which thereby exhibits an effective electromagnetic wave absorption effect. There is prevented occurrence of reflection of an electromagnetic wave (i.e., incidence noise), which would otherwise be caused by the surface of the thermalconductive material 315, or occurrence of re-radiation of noise, by means of suppressing a high-frequency current developing in the surface of the shieldingcase 303. - An elastic material is used for the thermal
conductive material 315, thereby preventing occurrence of displacement of the elementmain body section 302 a, by means of absorbing the mechanical/thermal vibration applied to theshielding case 303. As a result, in addition to the effect of absorbing an electromagnetic wave, the thermalconductive material 315 also yields an effect of tightly fixing the elementmain body section 302 a in an accurate position within the casemain body section 307. Furthermore, the thermalconductive material 305 absorbs mechanical displacements and thermal natural oscillation stemming from differences in material, dimensions, geometry, and mounting method between the shieldingcase 307 and theoptical element 302, thereby preventing occurrence of breakage in thelead terminals 302 b. - FIGS. 17 through 26 show a second modification of the embodiment. Those constituent elements which are the same as those described in connection with the first modification are assigned the same reference numerals, and their explanations are omitted.
- In the modification, a
spring piece section 317 having an appropriate width is provided integrally in the casemain body section 307 in a collapsed form by way of an open edge formed in the lower end of the rear wall section opposite to thewindow section 307 a of the casemain body section 307. Thespring piece section 317 is provided so as to extend to the vicinity of a top in the casemain body section 307. - In the present modification, the positioning bumps307 b are formed only on side wall sections of the case
main body section 307. - When the element
main body section 302 a is inserted into the casemain body section 307, thespring piece section 317 is elastically deformed. In a state in which the elementmain body section 302 a is fitted into the casemain body section 307, the elementmain body section 302 a is retained while being pressed against the interior surface of the front wall section by means of restoration force of thespring piece section 317. - Since the modification is constructed in the manner as mentioned above, when the
optical connector 301 is mounted on thecircuit board 310, the casemain body section 307 is fitted into the casehousing recess section 304 of theconnector housing 305 while the elementmain body section 302 a of theoptical element 302 is fittingly housed in the casemain body section 307 of the shieldingcase 303. Further, thelead terminals 302 b are inserted into the insertion holes of the predetermined circuit trace of thecircuit board 310. Thelead sections 308 are inserted into theground circuit 311, thereby placing theoptical connector 301 into a predetermined position. Theoptical connector 301 is fixedly mounted on thecircuit board 310 by means of the screw sections provided on both sides of theconnector housing 305. At this time, thelead terminals 302 b and thelead sections 308 are connected to a predetermined circuit by means of soldering. - As in the case of the first modification, the element
main body section 302 a of theoptical element 302 is housed in theshielding case 303 and has superior noise resistance. - The heat developing in the element
main body section 302 a of theoptical element 302 escapes to the outside by way of the casemain body section 307. At this time, the elementmain body section 302 a is pressed against the interior surface of the front wall section within the casemain body section 307, by means of the restoration force of thespring piece section 317. The front surface of the elementmain body section 302 a remains in intimate contact with the interior surface of the front wall section of the casemain body section 307. The heat developing in the elementmain body section 302 a is efficiently transferred to the casemain body section 307 by way of the front wall section or thespring piece section 317 which exerts pressing force. Thus, the elementmain body section 302 a has a superior heatsink characteristic. - The
spring piece section 317 is provided on the rear wall section, thereby pressing the elementmain body section 302 a against the interior surface of the front wall section. The light-emitting or light-receiving plane of the elementmain body section 302 a is placed closer to thewindow section 307 a. Thus, a distance between the side of theoptical element 302 to be connected to theoptical connector 301 and an optical fiber can be shortened further, thereby enabling an attempt to improve stability when optical communication is performed. - As compared with a case where the
spring piece section 317 is formed by means of cutting and raising a portion of the rear wall section, an improved electromagnetic shielding function can be exhibited when a portion extending from the lower end of the rear wall section is folded. - The
optical connector 301 has a superior heatsink characteristic and noise resistance. Consequently, theoptical element 302 can be stably activated at a higher speed (i.e., a higher frequency). - The second modification has shown the structure in which the
spring piece section 317 is provided integrally. However, thespring piece section 317 may be formed separately and attached to the interior surface of the casemain body section 307. The number ofspring piece sections 317 is not limited to one, and thespring piece sections 317 may be provided at multiple locations. - If the
spring piece section 317 forcefully presses the neighborhood of a heat source, such as a drive circuit portion of the elementmain body section 302 a, heat is transferred more effectively, thereby greatly enhancing a heatsinking effect. - As in the case of the first modification, the second modification may employ a structure in which a clearance existing between the internal circumferential surface of the case
main body section 307 and the outer circumferential surface of the elementmain body section 302 a is filled with the thermalconductive material 315 which assumes the form of a gel or liquid, sets at a certain temperature condition, and has a superior heat transfer characteristic. Even in this case, heat transfer is effected more effectively, thereby further enhancing a heatsinking effect. - Rather than the clearance between the internal circumferential surface of the case
main body section 307 and the outer circumferential surface of the elementmain body section 302 a being filled with the thermalconductive material 315, an elastic member having a superior heat transfer characteristic; for example, an elastic member such as one made of rubber—in which a conductive powder such as a carbon powder or a metal filler and a magnetic powder such as ferrite or Sendust are mixed—may be interposed in a compressed state in the clearance. Even in this case, heat transfer is performed more effectively, thereby further enhancing the heatsinking effect. A soft material involving little compression set is preferable as an elastic material. - In the respective modifications, the
connector housing 305 is not limited to resin and may be formed from a metal material such as aluminum or an aluminum alloy. When theconnector housing 305 per se is formed from metal material, the heat developing in theoptical element 302 becomes likely to escape to the outside from the shieldingcase 303 by way of theentire connector housing 305. Such an optical connector is superior in ease of heat dissipation of theoptical element 302 to theoptical connector 301 in which theconnector housing 305 is formed from resin having a poor heat transfer characteristic. - As has been described, according to the optical element holding structure of the shielding case of the invention, a clearance existing between an internal circumferential surface of a case main body section and an outer circumferential surface of an element main body section, exclusive of the position of a window for optical communication formed in the case main body section, is filled with thermal conductive material assuming the form of a gel or liquid, and the thus-filled thermal conductive material is set. Heat developing in the element main body section is efficiently transferred to the case main body section by way of the thermal conductive material. The optical element holding structure is advantageously superior in countermeasures against noise and heat.
- Provided integrally on or separately from at least one side surface of an internal circumferential surface of a case main body section is a spring piece section for pressing an element main body section against another side surface of the internal circumferential surface. Even such a construction yields an advantage of the heat developing in the element main body section being efficiently transferred to the spring piece section for exerting a pressing force and to the case main body section against which the element main body section is pressed. Thus, the shielding case is superior in countermeasures against noise and heat.
- The spring piece section is provided at a position on the internal circumferential surface opposing the window section for optical communication formed in the case main body section. A distance between the optical element and an optical fiber to be connected to the optical connector can be shortened greatly, thereby yielding an advantage of an improvement in stability of optical communication.
- The portion of the element main body section to be pressed by the spring piece section corresponds to a neighborhood of a heat source of the element main body section. Heat transfer is more effectively performed, thereby further enhancing a heatsinking effect.
- The spring piece section is provided in the case main body section in a collapsed and extended manner by way of the opening edge section into which the element main body section of the case main body section is fitted. Such a structure yields an advantage of the ability to exhibit a more favorable electromagnetic shielding function.
- A clearance existing between an internal circumferential surface of a case main body section and an outer circumferential surface of an element main body section, exclusive of the position of an optical communication window formed in the case main body section, is filled with thermal conductive material assuming the form of a gel or liquid, and the thus-filled thermal conductive material is set. Such a structure yields an advantage of the ability to perform heat transfer more effectively to thereby further enhance a heatsinking effect.
- Further, an elastic member is interposed in a compressed state in the clearance existing between the internal circumferential surface of the case main body section and the outer circumferential surface of the element main body section, exclusive of the position of a window for optical communication formed in the case main body section. Even in this case, heat transfer is performed more effectively, thereby further enhancing the heatsinking effect.
- The construction of a mount section of an optical connector according to an embodiment of the invention will be described hereinbelow.
- As shown in FIG. 26, the mount section of an optical connector has a construction to be used for mounting, on a
mount board 430, anoptical connector 401 having incorporated therein optical elements D, such as a light-emitting element and a light-receiving element. - The
optical connector 401 comprises aconnector housing 402 formed from insulation material, such as resin, and ametal shielding shell 410 made of metal material. - A
housing recess section 404 which is open at a bottom thereof is formed in theconnector housing 402. - More specifically, the
housing recess section 404 is formed in a housingmain body section 403 located in the rear part of theconnector housing 402, and guidesleeve sections 406 are formed in theconnector housing 402 so as to protrude forward from the forward part of themain body section 403. - The
housing recess section 404 is open in the bottom surface of themain body section 403. An element housing case section 411 (to be described later) of themetal shielding shell 410 is to be housed in thehousing recess section 404 by way of the opening formed in the bottom. - Of the housing
main body section 403, a bottom surface of arear wall section 403a of thehousing recess section 404 recedes from the remaining bottom surface of theconnector housing 402. While theconnector housing 402 is mounted on themount board 430, a ground piece 418 (to be described later) can be interposed between the bottom surface of arear wall section 403 a and an upper surface of themount board 430. - Each of the
guide sleeve sections 406 is formed in a substantially-cylindrical member projecting forward of themain body section 403. Formed in theguide sleeve section 406 is aguide hole 406 h which enables insertion of aferule 450 of a mating optical connector. Theguide hole 406 h is in communication with thehousing recess 404. When theferrule 450 is inserted into any of theguide sleeve sections 406, an end face of an optical fiber held in theferrule 450 is positioned so as to oppose an optical coupling section Db of the optical element D housed in the housing recess 404 (i.e., an optical light-emitting plane or an optical light-receiving plane). As a result, optical coupling is established between the optical fiber and the optical element D. - The
guide sleeve sections 406 are enclosed by a substantially-angularly-cylindricalprotective wall section 407 while being spaced a given interval away from each other. - As shown in FIGS. 26 and 27, the
metal shielding shell 410 is formed by means of punching and bending, e.g., a metal plate, as required. Theelement housing case 411 capable of housing the optical element D, aheatsink section 415, and agrounding piece 418 are formed into a single piece. - The
element housing case 411 is formed so as to be able to be housed in theconnector housing 402 while housing the optical element D therein. - More specifically, the element
housing case section 411 is formed into substantially the shape of a box capable of housing the entirety of an element main body Da of the optical element D. The bottom surface of the elementhousing case section 411 is open. The element main body section Da is inserted and housed in the elementhousing case section 411 by way of the opening formed in the bottom thereof Awindow section 411 h is formed in a front surface of the elementhousing case section 411. The optical coupling section Db of the element main body section Da (i.e., the light-emitting plane of the light-emitting element or the light-receiving plane of the light-receiving element) faces outside by way of thewindow section 411 h. - The
grounding piece 418 is formed into the shape of a plate extending along the bottom surface of theconnector housing 402. - In the embodiment, the
grounding piece 418 is provided so as to extend along the bottom surface of therear wall section 403 a of thehousing recess section 404. While theconnector housing 402 is mounted on themount board 430, thegrounding piece 418 is interposed between the bottom surface of therear wall section 403 a and themount board 430. Further, a lower surface of thegrounding piece 418 is formed so as to be able to come into plane contact with a predetermined ground trace 431 e formed on the upper surface of themount board 430. - More specifically, the
heatsink section 415 is formed such that at least a part of theheatsink section 415 is exposed outside of theconnector housing 402. - Specifically, the
heatsink section 415 is formed into the shape of a substantially-square plate corresponding to the back of theconnector housing 402. Theheatsink section 415 is spaced a predetermined interval from and in parallel with the back of theelement housing case 411. A lower edge of theheatsink section 415 and a lower edge of the back of theelement housing case 411 are joined together at the bottom surface of therear wall section 403 a by means of thegrounding piece 418. - Lead
terminals 419 project downward at right angles from the four corners of themetal shielding shell 410. While themetal shielding shell 410 is attached to theconnector housing 402, thelead terminals 419 project downward from theconnector housing 402 and can be soldered to themount board 430. - The
mount board 430 is a well-known board on which predetermined traces are formed from copper foil. As shown in FIG. 26, a ground trace 431 e is formed in an area assigned to thegrounding piece 418 on one surface of the mount board 430 (i.e., an upper surface side of themount board 430 shown in FIG. 26) within the area in which theoptical connector 401 is to be mounted. Formed in the area in which theoptical connector 401 is to be mounted are throughholes 430 h which enable insertion of a lead terminal Dc of the optical element D and thelead terminals 419 of themetal shielding shell 410. Anotherpredetermined ground trace 432 e and asignal trace 433 are formed on the other surface side of the mount board 430 (i.e., a lower surface of themount board 430 shown in FIG. 26). - The
optical connector 401 is assembled in the manner set forth and mounted on themount board 430. - First, while the optical element D is housed in the element
housing case section 411 of themetal shielding shell 410, the elementhousing case section 411 is inserted into thehousing recess 404, and theheatsink section 415 is provided along the back of theconnector housing 402. Themetal shielding shell 410 is inserted into theconnector housing 402 from below until thegrounding piece 418 contacts the bottom surface of therear wall section 403 a, thus completing assembly of theconnector housing 402. - Next, the
lead terminals 419 of themetal shielding shell 410 and the lead terminal Dc of the optical element D are inserted into the corresponding throughholes 430 h. When theoptical connector 401 is mounted within a predetermined mount area on themount board 430, thegrounding piece 418 comes into plane contact with the ground trace 43le provided on themount board 430. In this state, thelead terminals 419 projecting beyond the lower surface of themount board 430 are soldered to theground trace 432 e, and the lead terminal Dc is soldered to thesignal trace 433, whereby theoptical connector 401 is fixedly mounted on themount board 430. - By means of the construction of the mount section of the
optical connector 401, themetal shielding shell 410 is grounded by way of the plane contact existing between thegrounding piece 418 and the ground trace 431 e, as well as by way of the soldered portion existing between thelead terminals 419 and theground trace 432 e. - By means of the construction of the mount section of the
optical connector 401 configured in the manner mentioned above, the plate-like grounding piece 418 that is provided so as to extend along the bottom surface of theconnector housing 402 is formed integrally in the elementhousing case section 411. Themetal shielding shell 410 is grounded by way of thegrounding piece 418. As compared with the related-art example shown in FIG. 31 in which an optical connector is grounded by way of only a pin-shaped lead terminal, the optical connector of the invention can minimize ground resistance. - In pursuant to the embodiment, the
grounding piece 418 is brought into plane contact with the ground trace 431 e formed on one surface of themount board 430. By means of a configuration of plane contact, contact resistance developing between thegrounding piece 418 and the ground trace 431 e can be reduced, thus minimizing ground resistance. - In the embodiment, the
lead terminals 419 of themetal shielding shell 410 are formed and soldered to theground trace 432 e. However, thelead terminals 419 may be omitted. - In the
metal shielding shell 410, the heat developing in the optical element D is in principle transferred from the elementhousing case section 411 to theheatsink section 415 by way of thegrounding piece 418. The heat is then dissipated outside from theheatsink section 415. In the embodiment, thegrounding piece 418 remains in plane contact with the ground trace 431 e, and hence the heat developing in the optical element D is also transferred from the elementhousing case section 411 to the trace 431 e by way of thegrounding piece 418. The heat is then dissipated outside from the trace 431 e. Hence, the optical element D is also superior in a heatsink characteristic. - Since the
grounding piece 418 is provided so as to extend along the bottom surface of theconnector housing 402, thegrounding piece 418 does not jut outward of theconnector housing 402. Hence, the area required for mounting theoptical connector 401 can be minimized. Further, the construction of theconnector housing 402 can be simplified. Hence, a die employed for manufacturing theconnector housing 402 can also be simplified. - In the embodiment, the
heatsink section 415 may be omitted. - In the embodiment, the
grounding piece 418 is a member to be used for coupling the elementhousing case section 411 with theheatsink section 415 at the bottom surface of theconnector housing 402. By utilization of thegrounding piece 418 by way of which the elementhousing case section 411 and theheatsink section 415 are coupled together, themetal shielding shell 410 can be grounded efficiently. - Like the construction of a mount section of an
optical connector 401B according to a first modification shown in FIG. 28, a screw through hole 418Bh is formed in thegrounding piece 418, and a screw through hole 430Bh is formed in themount board 430. Ascrew hole 403 aBh is formed in the bottom of therear wall section 403 a of thehousing recess 404 of theconnector housing 402. A screw S is inserted into the screw insertion holes 430Bh, 418Bh from below the lower surface of themount board 430. The thus-inserted screw S is screw-engaged with ascrew hole 403 aBh and may be fastened so as to bring thegrounding piece 418 into pressing contact with the ground trace 431 e. In this case, the screw S is to be used for bringing thegrounding piece 418 into pressing contact with the ground trace 431 e. Hence, the screw S may be made of metal or resin. - Although the first modification omits the
lead terminals 419 and the corresponding throughholes 430 h, they may be retained. - In the first modification, the
grounding piece 418 and the ground trace 431 e are forcibly brought into pressing contact with each other by means of fastening force of the screw S. For this reason, ground resistance can be made much lower. - Like a mount section of an optical connector401C according to a second modification shown in FIG. 29, a metal screw Sm is brought into electrical contact with the
grounding piece 418, as well as with aground trace 434 e formed on the lower surface of themount board 430. In this case, the screw Sm may be inserted into themount board 430 and thegrounding piece 418 from the lower surface of themount board 430 and fastened to theconnector housing 402. - More specifically, a screw insertion hole430Ch is formed in the
mount board 430, and a screw hole 418Ch is formed in thegrounding piece 418. Further, ascrew hole 403 aCh is formed in the bottom of therear wall section 403 a of thehousing recess 404 in theconnector housing 402. Theground trace 434 e is formed in the area surrounding thescrew hole 403 aCh on the lower surface of themount board 430. The metal screw Sm is screwed and fastened, from the lower surface of themount board 430, to the screw hole 418Ch and thescrew hole 403 aCh by way of the screw insertion hole 430Ch. - In the second modification, the
metal shielding shell 410 is electrically connected as a result of the metal screw Sm being screw-engaged with the screw hole 418Ch. Further, a portion of a screw head Sma of the metal screw Sm close to a screw shaft Smb is brought into plane contact with and electrically connected to theground trace 434 e. Hence, thegrounding piece 418 is connected to thetrace 434 e and grounded by way of the metal screw Sm having a comparatively large diameter. - As compared with the related-art example in which the optical connector is grounded by way of only the pin-shaped lead terminal, the second modification also enables minimization of ground resistance.
- In place of the construction which has been described in connection with the embodiment and in which the
grounding piece 418 is brought into plane contact with and grounded by way of the ground trace 431 e provided on themount board 430, the second modification employs a construction in which thegrounding piece 418 is connected to theground trace 434 e by way of the metal screw Sm and is thus grounded. As a matter of course, both constructions can be adopted. - In the embodiment, an optical connector mounted on a mount board was actually manufactured. The optical connector was subjected to an immunity test.
- Objects of the test were an optical connector grounded (plane-grounded type) by means of bringing the
grounding piece 418 into plane contact with the ground trace 431 e in the manner as described in connection with the embodiment, and an optical grounded (screw-grounded type) by way of the metal screw Sm in the manner as mentioned in connection with the second modification. For the purpose of comparison, an optical connector similar to that described in connection with the embodiment but not grounded (non-grounded type) and an optical connector grounded (lead-terminal-grounded type) by way of only onelead terminal 419 were also subjected to an immunity test. - The tests were conducted in accordance with the TEM cell method under specified conditions; namely, a frequency range of 430 through 350 MHz, an applied electromagnetic field of 200 V/m, and 80% AM modulation.
- As shown in FIG. 30, the optical connector of screw-grounded type was improved in degradation of receiving level as compared with the optical connector of lead-terminal-grounded type corresponding to the related-art optical connector and the optical connector of non-grounded type. The optical connector of plane-grounded type was improved as compared with the optical connector of screw-grounded type. The test results show that sufficient electromagnetic shielding effect was achieved by virtue of a reduction in ground resistance.
- By means of the structure of the mount section of the optical connector according to this embodiment constructed in the manner mentioned previously, a plate-like grounding piece which is provided so as to extend along a bottom surface of a connector housing is formed integrally in an element housing case. A metal shield shell is grounded by way of the grounding piece. Hence, as compared with a related-art example in which an optical connector is grounded by way of only a pin-shaped lead terminal, the optical connector can minimize ground resistance.
- The grounding piece is provided so as to extend along the bottom surface of the connector housing. Hence, the grounding piece does not jut out from the connector housing. Further, an area required for fixedly mounting the optical connector can also be minimized.
- By means of the construction of the mount section of the optical connector according to this embodiment, the metal shielding shell is grounded efficiently by means of utilization of the element housing case section and the heatsink section.
- As described in this embodiment, the grounding piece is brought into plane contact with a ground trace formed on one side of a mount board, thereby diminishing resistance existing between the grounding piece and the ground trace and minimizing ground resistance.
- In this case, as described in this embodiment, a screw is inserted into the mount board and the grounding piece from the other side of the mount board and screw-engaged with the connector housing by means of fastening. By means of the fastening force of the screw, the grounding piece and the ground trace are forcibly brought into contact with each other, thereby diminishing ground resistance to a much greater extent.
- As described in this embodiment, a metal screw is brought into electrical contact with the ground trace formed on the other side of the mount board and into electrical contact with the grounding piece. In this state, the metal screw is inserted into the mount board and the ground piece from the other side of the mount board and screw-engaged with the connector housing by means of fastening. By way of the metal screw, the metal shielding shell can be electrically connected to the ground trace while involving much lower ground resistance.
- By means of the optical connector according to the invention, a plate-like grounding piece which is provided so as to extend along the bottom surface of the connector housing formed on the mount board and which is electrically connectable to the ground trace is formed integrally in an element housing case section. As compared with the related-art optical connector which is grounded by means of only a pin-shaped lead terminal, the optical connector can minimize ground resistance.
- The grounding piece is provided so as to extend along the bottom surface of the connector housing. Hence, the grounding piece does not jut out from the connector housing, and the area required for fixedly mounting the optical connector can be minimized.
Claims (10)
1. An optical element holding structure comprising:
a case main body section of a shielding case,
an element main body section of an optical element which is to be fitted into the case main body section, and
a thermal conductive material disposed between an internal surface of the case main body section and an outer surface of the element main body section.
2. The optical element holding structure according to claim 1 , wherein
the thermal conductive material is poured into a clearance between an internal surface of the case main body section and an outer surface of the element main body section as the form of a gel or liquid and is cured.
3. The optical element holding structure according to claim 1 , wherein
the thermal conductive material is provided except for the position of a window for optical communication formed in the case main body section.
4. An optical element holding structure comprising:
a case main body section of a shielding case,
an element main body section of an optical element which is to be fitted into the case main body section,
a spring piece section which is provided on an internal circumferential surface of the case main body section, wherein
the spring piece presses the element main body section against the internal circumferential surface the case main body section.
5. The optical element holding structure according to claim 4 , wherein
the spring piece section is formed integrally with or separately from the element main body section.
6. The optical element holding structure according to claim 4 , wherein
the spring piece section is provided at a position on the internal circumferential surface opposing a window formed in the case main body section.
7. The optical element holding structure according to claim 4 , wherein
a portion of the element main body section to be pressed by the spring piece section is situated in the vicinity of a heat source of an element main body section.
8. The optical element holding structure according to claim 4 , wherein
the spring piece section extends from an opening edge of the case main body section and is folded back into the inside of the case main body section.
9. The optical element holding structure according to claim 4 , further comprising:
a thermal conductive material existing between an internal surface of the case main body section and an outer surface of the element main body section.
10. The optical element holding structure according to claim 4 , wherein
an elastic member is interposed in a clearance existing between an internal surface of the case main body section and an outer surface of the element main body section.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/681,301 US20040071412A1 (en) | 2001-04-03 | 2003-10-09 | Optical connector, optical element holding structure, and structure of a mount section of an optical connector |
Applications Claiming Priority (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001-104426 | 2001-04-03 | ||
JP2001104367A JP2002303764A (en) | 2001-04-03 | 2001-04-03 | Optical connector |
JP2001104426A JP2002303762A (en) | 2001-04-03 | 2001-04-03 | Optical connector |
JP2001-104367 | 2001-04-03 | ||
JP2001-105479 | 2001-04-04 | ||
JP2001105479A JP2002299652A (en) | 2001-04-04 | 2001-04-04 | Optical element holding structure of shield case |
JP2001176540A JP2002365486A (en) | 2001-06-12 | 2001-06-12 | Structure of optical connector mounting part and optical connector |
JP2001-176540 | 2001-06-12 | ||
US10/109,684 US6939054B2 (en) | 2001-04-03 | 2002-04-01 | Holding structures for optical elements of an optical connector |
US10/681,301 US20040071412A1 (en) | 2001-04-03 | 2003-10-09 | Optical connector, optical element holding structure, and structure of a mount section of an optical connector |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/109,684 Division US6939054B2 (en) | 2001-04-03 | 2002-04-01 | Holding structures for optical elements of an optical connector |
Publications (1)
Publication Number | Publication Date |
---|---|
US20040071412A1 true US20040071412A1 (en) | 2004-04-15 |
Family
ID=27482171
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/109,684 Expired - Fee Related US6939054B2 (en) | 2001-04-03 | 2002-04-01 | Holding structures for optical elements of an optical connector |
US10/681,301 Abandoned US20040071412A1 (en) | 2001-04-03 | 2003-10-09 | Optical connector, optical element holding structure, and structure of a mount section of an optical connector |
US10/681,299 Expired - Fee Related US6860643B2 (en) | 2001-04-03 | 2003-10-09 | Optical connector with a surface mounted shield |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US10/109,684 Expired - Fee Related US6939054B2 (en) | 2001-04-03 | 2002-04-01 | Holding structures for optical elements of an optical connector |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/681,299 Expired - Fee Related US6860643B2 (en) | 2001-04-03 | 2003-10-09 | Optical connector with a surface mounted shield |
Country Status (3)
Country | Link |
---|---|
US (3) | US6939054B2 (en) |
EP (2) | EP1524538B1 (en) |
DE (2) | DE60221736T2 (en) |
Cited By (4)
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US20070230965A1 (en) * | 2004-06-03 | 2007-10-04 | Rohm Co., Ltd | Optical Communication Module |
US20120082420A1 (en) * | 2009-06-15 | 2012-04-05 | Fujitsu Optical Components Limited | Optical module |
EP2711753A1 (en) * | 2012-09-24 | 2014-03-26 | The Boeing Company | Optical connector |
US9083137B2 (en) | 2009-06-16 | 2015-07-14 | Autonetworks Technologies, Ltd. | Optical communication module |
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JP4411506B2 (en) * | 2002-09-18 | 2010-02-10 | 住友電気工業株式会社 | Optical communication device |
JP2005116400A (en) * | 2003-10-09 | 2005-04-28 | Auto Network Gijutsu Kenkyusho:Kk | Optical active connector |
DE102004009967B4 (en) * | 2004-03-01 | 2010-03-18 | Airbus Deutschland Gmbh | Cable holder for an aircraft, cable holder kit and aircraft with a cable holder |
CN201130260Y (en) * | 2007-11-09 | 2008-10-08 | 富士康(昆山)电脑接插件有限公司 | Optical fiber connector |
TWI475519B (en) * | 2008-03-26 | 2015-03-01 | Nohmi Bosai Ltd | Photoelectric smoke detector |
EP2138881A1 (en) * | 2008-06-24 | 2009-12-30 | Comoss Electronic Co. Ltd. | Optical-isolation apparatus of an optical-fiber connector |
JP5942967B2 (en) * | 2013-11-29 | 2016-06-29 | 株式会社デンソー | Drive device |
JP7359579B2 (en) * | 2019-07-05 | 2023-10-11 | 日東電工株式会社 | Optical and electrical composite transmission module |
DE102020123465B4 (en) | 2020-09-09 | 2022-03-17 | HARTING Electronics GmbH | Optoelectronic module, optoelectronic connector and optoelectronic sub-distribution |
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Also Published As
Publication number | Publication date |
---|---|
EP1248128A3 (en) | 2004-06-02 |
EP1248128B1 (en) | 2007-08-15 |
US6860643B2 (en) | 2005-03-01 |
US20020141706A1 (en) | 2002-10-03 |
DE60222815T2 (en) | 2008-07-03 |
EP1248128A2 (en) | 2002-10-09 |
US6939054B2 (en) | 2005-09-06 |
EP1524538B1 (en) | 2007-10-03 |
US20040071406A1 (en) | 2004-04-15 |
DE60221736T2 (en) | 2008-06-05 |
DE60222815D1 (en) | 2007-11-15 |
DE60221736D1 (en) | 2007-09-27 |
EP1524538A1 (en) | 2005-04-20 |
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Legal Events
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |