JP5190020B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device in which a plurality of light emitters such as light emitting diodes (LEDs) are juxtaposed as a light source.

  An illumination device using a plurality of LEDs as a light source as a light source is used in, for example, an image processing device. However, if the device has been operating for a long time, the LED as a light source deteriorates with time and decreases its brightness and light quantity. There is a case. In such a case, the luminance and light intensity may be temporarily improved by passing a large amount of current over an LED that has deteriorated over time, but this is only an emergency measure and the LED must be replaced in a short period of time. The In any case, it is required to quickly detect deterioration and malfunction of the LED over time.

  In view of this, in such an illuminating device, a device has been devised that constantly monitors the luminance and light amount emitted from the LED and detects deterioration and malfunction of the LED over time. For example, the illumination system shown in FIG. 16 includes a housing 100, a plurality of LEDs 101 installed on a substrate 102 provided on the inner bottom surface thereof, and a condenser 103 that collects light from the LEDs. The light collected by the vessel 103 is reflected by a reflector 109 provided with a reflective coating 105 on the inner surface arranged on the upper portion of the housing 100 through a diffusion plate 110 arranged in the light exit window 104 to obtain irradiated light. In this illumination system, a protruding portion 107 protruding downward from the side surface 106 of the condenser 103 is provided, and a part of the light reflected by the exit window 104 out of the light from the LED 101 is introduced into the protruding portion 107, By detecting with an optical sensor 108 provided on the substrate 102, a subtle decrease in the luminance and light quantity of the LED is detected, and deterioration with time and malfunction of the LED are judged (Patent Document 1).

Special table 2008-515140

  However, in the case of the illumination system of Patent Document 1, since the emitted light of the LED extracted from the protruding portion 107 is originally usable as irradiation light, by such extraction, although it is a little, irradiation is performed. Reduce the amount of light. In addition, since the reflector 109 and the protrusion 107 are provided, the lighting device has been increased in size.

  The objective of this invention is providing the illuminating device which can implement | achieve time-dependent deterioration and malfunction detection of a light-emitting body with a compact structure, without reducing irradiation light quantity.

  In order to achieve the above object, an illumination device according to the present invention is provided with a plurality of light emitters arranged side by side, a lens body arranged in front of the light emitter and on the rear side of the light emitter. A light receiving element, and the lens body is disposed in an area that is disposed between the irradiation unit that directs the emitted light from the light emitter in a predetermined direction and a plurality of adjacent light emitters and is out of the irradiation unit. It has a reflection part that reflects the emitted light of each light-emitting body that enters the light backward and a light guide part that guides the reflected emitted light to the light receiving element.

  According to this configuration, since the outgoing light that enters the area outside the irradiation part of the lens body is guided to the light receiving element through the reflection part and the light guiding part of the lens body, the luminance from the light emitting body by this light receiving element. Or the amount of light can be detected to determine the presence or absence of deterioration of the light emitter over time. Thus, the emitted light used for light reception by the light receiving element is not emitted light that is effectively used by being directed in a predetermined direction from the irradiating unit, but is originally used as being incident on an area outside the irradiating unit. Since the light is wasted as stray light, the amount of light emitted from the lighting device is not reduced. In addition, since the reflecting portion of the lens body is disposed between the adjacent light emitters, the state of emission from the plurality of light emitters is recognized at the same time, and the presence / absence of deterioration of the light emitters with time is determined at the same time. it can. Furthermore, since the light receiving element is disposed behind the light emitter, an increase in the width of the proving device is suppressed.

  In the present invention, the reflecting portion has a recess recessed backward and a flat surface around the front opening of the recess, and the emitted light reflected on the inside of the flat surface is on the side surface of the recess. You may make it reflect in a back side and go back. By using the reflection action in this manner, the emitted light can be smoothly directed rearward, and the structure can be simplified.

  In the present invention, the concave portion of the reflecting portion is formed in a quadrangular pyramid shape located in the center of a quadrilateral connecting the centers of four light emitters adjacent in plan view, and the quadrangular pyramid tapers backward. It is preferable that the shape is a shape and each side surface thereof faces the corresponding light emitter. Here, the “quadrangular pyramid” is a shape including both a quadrangular pyramid and a quadrangular pyramid. According to this configuration, the concave portion of the reflecting portion is formed in a quadrangular pyramid shape tapered toward the rear, so that light from the four light emitters around the concave portion is efficiently guided to the light guide portion. it can. In addition, since each side surface of the quadrangular pyramid faces each light emitter, light from any light emitter is reflected by the corresponding side surface and can be uniformly guided to the light guide section.

  In the present invention, it is preferable that the light guide portion has a tapered shape toward the rear. Here, the tapered shape may be a conical shape or a quadrangular pyramid shape. According to this configuration, the light from the light emitter reflected on each side surface of the recess of the reflecting portion is guided to the light guide portion, and the light guide portion has a tapered shape toward the rear. It is condensed on the central part of the light part. This increases the amount of light received by the light receiving element.

  In the present invention, preferably, a first wiring board on which the light emitter is mounted, a second wiring board on which the light receiving element is mounted, first and second sheets of electrical insulation, and rear A highly thermally conductive support having an open-shaped cross-sectional shape, and a highly thermally conductive case for housing the lens body, the first and second wiring boards, and the first and second sheets; The first wiring board is supported on the front surface of the bottom wall of the support body via the first sheet, and the second wiring board is supported on the rear surface of the bottom wall of the support body via the second sheet. The rear surfaces of both side walls of the support are in contact with the bottom wall of the case. Here, high thermal conductivity means having a thermal conductivity of 5 W / (m · K) or more at room temperature (25 ° C.), and corresponds to silicon, iron, aluminum, and the like.

  According to this configuration, it is possible to obtain a compact lighting device having both an irradiation function that is an original function and a detection function that detects deterioration with time of the light emitter. In addition, since the support and the case have high thermal conductivity, and the rear surfaces of both side walls of the support are in contact with the bottom wall of the case, the heat generated inside is radiated to the outside through the support and the case. Therefore, the first wiring board and the second wiring board are hardly affected by heat, and thermal damage can be avoided as much as possible.

  In the present invention, a cover that covers the front opening of the case, and a pressing member that presses the support body against the bottom wall of the case by pressing the lens body backward between the cover and the lens body. And a member. The front opening of the case is covered with a cover, so that foreign matter such as dust and moisture can be prevented from entering from above, and the lens body is stably supported by the support member by the pressing member. Even if some vibration is applied, the lens body is not displaced and its directivity and light guiding properties are not impaired, so that stable irradiation and light guiding are performed.

  In the present invention, a mask that exposes the irradiation part of the lens body and covers the reflection part from the front may be provided. Since only the reflection part is covered with the mask from the front, the light from the outside is reflected by the mask, so that it does not enter the light receiving element from the reflection part through the light guide part and transmits from the reflection part to the outside. Part of the light from the light emitter that passes through is also reflected by the mask and guided to the light guide. Accordingly, since only a part of the light emitted from the light emitter can be received by the light receiving element, it is possible to accurately detect deterioration with time of the light emitter.

  In the present invention, the light emitter may be mounted on the front surface of the first wiring board, and the light receiving element may be mounted on the rear surface of the first wiring board. In this way, the number of wiring boards, one of the first and second sheets, and the support can be reduced, the structure is simplified, the dimensions in the front-rear direction can be reduced, and more compact. It can be set as a lighting device.

  According to the present invention, since the outgoing light that enters the area outside the irradiation part of the lens body is guided to the light receiving element through the reflection part and the light guiding part of the lens body, the luminance from the light emitting body by this light receiving element. Or the amount of light can be detected to determine the presence or absence of deterioration of the light emitter over time. At this time, light that is not originally used and is wasted as stray light is guided to the light receiving element, so that the irradiation light quantity of the lighting device is not reduced. In addition, it is possible to simultaneously recognize the emission states from the plurality of light emitters and to simultaneously determine whether the plurality of light emitters are deteriorated with time. Furthermore, since the light receiving element is disposed behind the light emitter, an increase in the width of the lighting device is suppressed.

It is a disassembled perspective view of the illuminating device concerning 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the illuminating device. It is a top view of the illumination device. It is a front view of the illumination device. It is the perspective view which looked at the same illuminating device from diagonally upward. It is the perspective view which looked at the same illuminating device from diagonally downward. It is a top view of a lens body. It is the perspective view which looked at the same lens body from the incident direction. It is a top view of the 1st wiring board. It is a top view of the 2nd wiring board. It is a principal part expanded sectional view explaining operation | movement of 1st Embodiment. It is a disassembled perspective view which shows the mask and lens body which are used with the illuminating device concerning 2nd Embodiment of this invention. It is a principal part expanded sectional view explaining operation | movement of 2nd Embodiment. It is a cross-sectional view of the illuminating device concerning 3rd Embodiment of this invention. It is a bottom view of the 1st wiring board used with the illumination device. It is a longitudinal cross-sectional view which shows the conventional illuminating device.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view of a lighting device according to a first embodiment of the present invention. This illuminating device is disposed on the first wiring board 1 on which a plurality of light emitters 10 made of LEDs are mounted, and on the front side (upper side in FIG. 1) of the first wiring board 1 on the emission side of the light emitters 10. Lens body 2, second wiring board 3 on which light receiving element 31 located behind light emitting body 10 (downward in FIG. 1) is mounted, and first and first layers having electrical insulation and high thermal conductivity. 2 and 4, a highly heat conductive support 6 having a U-shaped cross section opened rearward, the lens body 2, the first and second wiring boards 1, 3, and the first and first 2 and a highly heat conductive case 7 for storing the second sheets 4 and 5. The light emitters 10 are arranged in three rows, and a total of 15 light emitters 10 are arranged at equal pitches in each row. Adjacent rows of light emitters 10 are offset from each other by a half pitch. The first wiring board 1 is supported on the front surface of the bottom wall 60 of the support 6 via the first sheet 4, and the rear surface of the bottom wall 60 of the support 6 is interposed via the second sheet 5. The second wiring board 3 is supported.

  As shown in FIG. 2, which is a longitudinal sectional view, both side walls 61, 61 of the support 6 are slightly spaced on the inner surfaces of the side walls 71, 71 of the case 7 having a U-shaped cross section opened forward. Although they are close to each other, they may be brought into contact with each other. The rear surface 61 a of each side wall 61 of the support 6 shown in FIG. 1 is in contact with the inner surface of the bottom wall 70 of the case 7. An insertion hole 62 is provided through the support 6 so that a light guide portion 24 of the lens body 2 to be described later can be inserted.

  The first sheet 4 is formed of, for example, a silicon sheet that is excellent in electrical insulation and thermal conductivity and imparts adhesiveness, and the second sheet 5 is also formed of, for example, a silicon sheet. These sheets 4 and 5 together with the support 6 serve to conduct heat from the light emitter 10 and the control electronic component 63 described later to the case 7 side to radiate and cool the interior of the lighting device. It also has a function of holding the two wiring boards 1 and 3. Further, the first wiring board 1 is provided with an insertion hole 11, and the first sheet 4 is provided with an insertion hole 41, and a light guide portion 24, which will be described later, is provided in the insertion hole 11 and the insertion hole 41 when assembled. It is designed to be inserted. Since both the support 6 and the case 7 are made of a material having excellent thermal conductivity, for example, aluminum, the heat generated inside is radiated to the outside through the support 6 and the case 7, so that the first The wiring board 1 and the second wiring board 3 are not easily affected by heat generated by the light emitter 10 and the electronic circuit, and thermal damage can be avoided as much as possible.

  Further, the front opening of the case 7 is covered with a cover 8, and a pair of thin pressing members 12, 12 are provided between the cover 8 and the lens body 2. By attaching the cover 8 to the case 7, the pressing member 12 is pushed down by the cover 8 and presses the lens body 2 backward, thereby pressing the support 6 against the bottom wall 70 of the case 7. Further, end plates 13 and 13 for closing the both sides of the case 7 are attached to the case 7 by screw bodies 15A and 15B. The cover 8 is formed of a material having excellent transparency such as a transparent resin, and is connected to the first wiring board 1 after assembling the lighting device at the rear (lower) corner of the case 7. An extraction hole 72 for drawing the electric wire 16 to the outside is provided. The first wiring board 1 and the second wiring board 3 are electrically connected by a connection line (not shown).

  As shown in FIG. 2, the lens body 2 is arranged in front of the light emitting bodies 10 mounted on the first wiring board 1 on the emission side. The lens body 2 is disposed between a plurality of irradiation units 22 that direct light emitted from the light emitter 10 forward in a predetermined direction and a plurality of adjacent light emitters 10 and 10, and the irradiation unit 22. A plurality of reflecting portions 23 that reflect the outgoing light that enters a part of the region that is out of the range toward the rear, and a light guide portion 24 that guides the reflected outgoing light to the light receiving element 31. The light guide 24 extends so as to be in contact with or close to the upper surface of the band-pass filter 17 disposed so as to cover the light incident surface (upper surface) of the light receiving element 31 mounted on the second wiring board 3. Has been. The band pass filter 17 transmits only light having a specific wavelength, and the light having a specific wavelength is received by the light receiving element 31. The bandpass filter 17 may not be provided. A control electronic component 63 is mounted on the back side of the second wiring board 3.

  Each irradiation unit 22 is located right above each light emitter 10 mounted on the first wiring board 1 and is formed in a hemispherical shape. As shown in FIG. 11, which is an enlarged cross-sectional view of the main part, the reflection part 23 is provided at a position corresponding to a valley between the irradiation parts 22 and 22, and a recess 23a recessed rearward and a front opening thereof are provided. A surrounding flat surface 23b, and the outgoing light reflected on the inside of the lens body 2 of the flat surface 23b is reflected on the back side of the side surface of the recess 23a (inside the lens body 2) so as to be directed backward. Has been. The recess 23a has a quadrangular pyramid shape having a side surface 23aa and a bottom surface 23ab of a quadrangular pyramid that are tapered toward the rear.

  As shown in FIG. 7, which is a plan view of the lens body 2, the irradiation unit 22 a is located at the center of four adjacent irradiation units 22 in plan view, that is, at the center of a quadrilateral connecting the centers of the light emitters 10. Each side surface 23aa of the square pyramid faces the corresponding light emitter 10. In other words, the first wiring board 1 of FIG. 9 has two light emitter groups 10G composed of four light emitters 10, and the centers of the light emitters 10 and 10 facing each other in the longitudinal direction in each light emitter group 10G. The center of the recess 23a in FIG. 7 is on the intersection of the center line H1 connecting C1 and C1 and the center line H2 connecting the centers C2 and C2 of the light emitters 10 and 10 facing each other in the lateral direction perpendicular to the longitudinal direction. C is located. The shape of the recess 23a varies depending on the number of light emitters 10 around it. When there are three light emitters 10 around the recess 23a, the recess 23a has a triangular frustum shape, and when there are five, the recess 23a has a pentagonal frustum shape.

  As shown in FIG. 3, which is a plan view of the illumination device with the cover removed, the illumination device assembled in this way is provided with fifteen irradiation parts 22 in a staggered manner at predetermined intervals on the lens body 2. There are two irradiation groups 22G composed of four irradiation units 22 adjacent to the left and right, and the reflection unit 23 is located at the center of each irradiation group 22G. The screw holes 13a on the front surface of the end plates 13 and 13 disposed at both ends in the longitudinal direction are provided at the portions that coincide with the screw insertion holes 8a of the cover 8 of FIG. 1 described above, and are attached to the end plate 13 by screw bodies 15C. Thus, the front (upper) opening of the case 7 is closed.

  As shown in FIG. 4 which is a front view, screw insertion holes 7a and 7a are provided in the upper part (front part) of both ends in the longitudinal direction of the case 7, and the screw insertion hole 7a and the screw member 12 of FIG. The case 7 and the pressing member 12 are fastened to the end plate 13 by inserting the screw body 15 </ b> A through the hole 12 a and screwing into the screw hole 13 b of the end plate 13. Thereby, the pressing member 12 presses the lens body 2 and the first wiring board 1, and the side wall 61 of the support 6 is pressed against the bottom wall 70 of the case 7.

  As shown in FIG. 5 which is a perspective view seen obliquely from above, the electric wire 16 fixed to the back end of the first wiring board 1 shown in FIG. 1 is drawn out from the take-out hole 72 of the case 7 to the outside. Yes. Further, as shown in FIG. 6, mounting screw portions 19, 19 in which female threads are formed by burring are formed on the back surface of the case 7, and the lighting device is not illustrated using the mounting screw portions 19, 19. Can be attached to other equipment.

  As shown in FIG. 8, the light guide 24 that protrudes toward the back side of the lens body 2 has a tapered truncated cone shape. A projection 28 is formed at the center of the rear surface side of the lens body 2, and when the projection 28 is superimposed on the first wiring substrate 1 of FIG. It is easy to position the two by being fitted in.

  As shown in FIG. 10, the second wiring board 3 is housed in the downward U-shaped support body 6 of FIG. 2, and thus has a shape that is slightly smaller in width than the first wiring board 1. The light receiving elements 31, 31 are mounted on the upper surface side. As shown in FIG. 11, the light receiving element 31 is provided below the reflecting portion 23, that is, at a position facing the tip of the light guide portion 24. Two mounting holes 32 are formed in the second wiring board 3 of FIG. 10, and as shown in FIG. 1, the second sheet is formed from the back surface side of the second wiring board 3 by the screw body 15 </ b> D. 5 is attached to the support plate 6 through the attachment holes 51. A cutout portion 52 is formed in the second sheet 5, and the light receiving element 31 is accommodated in the cutout portion 52 when assembled.

  Next, the operation of the illumination device according to the first embodiment will be described. When the light emitter 10 mounted on the first wiring board 1 shown in FIG. 11 emits light, most of the light from the light emitter 10 is emitted from the hemispherical irradiation portion 22 of the lens body 2 as irradiation light V1. . Of the light emitted from the light emitter 10, the light V <b> 2 directed in the right direction in FIG. 11 causes total reflection at the flat plate portion 27 of the lens body 2 and is not effectively used as irradiation light as it is. On the other hand, the light V3 that is directly incident on the recess 23a of the reflecting portion 23 of the lens body 2 out of the light directed in the left direction is refracted and emitted to the outside, but on the flat surface 23b of the reflecting portion 23 of the lens body 2. The impinging light V4 is totally reflected on the back surface (inside the light emitter 2) and then totally reflected on the back surface (inside the light emitter 2) of the side surface 23aa of the recess 23a, and extends downward. Led to. In this manner, by utilizing the reflection action by the flat surface 23b and the recess 23a, a part of the emitted light can be easily directed to the rear light guide unit 24.

  At this time, a part of the light is totally reflected by the conical side surface of the light guide 24 and becomes a light beam V <b> 5 toward the center of the light guide 24, and is effectively condensed and located at the center of the light receiving element 31. Light enters a sensitive part (not shown). As a result, the amount of light incident on the light receiving element 31 increases, so that the accuracy of detecting changes in the luminance and light amount of the light emitter 10 is improved.

  Since the emitted light used for light reception by the light receiving element 31 is not the irradiation light V1 that is effectively used by being directed from the irradiation unit 22 in a predetermined direction, it is light that is not originally used but is wasted as stray light. The amount of irradiation light is not reduced. Moreover, since the reflection part 22 of the lens body 2 is disposed in the middle of the plurality of adjacent light emitters 10, it recognizes the emission state from the plurality of light emitters 10 at the same time, and degrades the plurality of light emitters 10 over time. The presence or absence can be judged at the same time. In this example, when the amount of light received by the light receiving element 31 decreases, it can be determined that one or more of the four light emitters 10 have deteriorated. Furthermore, since the light receiving element 31 is disposed behind the light emitter 10, an increase in the width dimension of the lighting device is suppressed. Thus, according to the first embodiment, it is possible to obtain a compact lighting device that has both the irradiation function, which is the original function, and the detection function for detecting deterioration with time of the light emitter 10.

  Further, since the front opening of the case 7 is covered with the cover 8, entry of foreign matter such as dust and moisture from above can be prevented. Further, since the lens body 2 is stably supported by the support body 6 by the pressing members 12 and 12, the lens body 2 is not displaced even if some vibration is applied to the illumination device, and the directivity thereof. In addition, since the light guide property is not impaired, stable irradiation and light guide are performed.

  Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, a mask 50 is arranged on the upper side of the lens body 2 to cover the front surface of the lens body 2 excluding the irradiation unit 22 (see FIG. 2). The mask 50 is formed with a circular cutout portion 51 corresponding to the irradiation portion 22 of the lens body 2, and other portions, that is, portions corresponding to the reflection portion 23 and the flat plate portion 27 of the lens body 2. Covering. The mask 50 may be made of a material that does not transmit light, such as a stainless steel plate.

  Further, the mask 50 may be one in which a reflective coating is applied to the back surface, that is, the contact surface with the lens body 2. When a reflective coating is applied to the back surface of the mask 50, the amount of light reflected by the reflecting portion 23 can be increased to increase the amount of light incident on the light receiving element 31 in FIG. That is, as shown in FIG. 13, the light from the light emitter 10 is the light that passes through the side surface 23aa of the recess 23a of the reflecting portion 23 of the lens body 2 among the light directed to the left side in FIG. And part of the light V6 is guided to the light guide 24 and enters the light receiving element 31 below through the light guide 24, so that the amount of light incident on the light receiving element 31 increases. Another part V7 of the light reflected by the mask 50 enters the adjacent irradiation unit 22 side and is emitted as effective irradiation light V1.

  As described above, according to the second embodiment, the light that enters the region outside the irradiation unit 22 of the lens body 2 out of the light emitted from the light emitter 10 is not emitted to the outside due to the presence of the mask 50. . As a result, light leaking outside when the mask 50 is not present can be guided to the light guide 24 and received by the light receiving element 31, so that the light receiving sensitivity of the light receiving element 31 is improved. Moreover, since a part of the light reflected by the mask 50 becomes effective irradiation light, the amount of irradiation light also increases.

  Next, a third embodiment of the present invention will be described with reference to FIG. In the third embodiment, the light receiving element 31 is mounted on the rear surface using the first wiring board 1 on which the light emitter 10 is mounted on the front surface. In addition, a connection terminal 76 to which the electric wire 16 is soldered is provided on the rear surface. The band pass filter 17 is not provided. The connection terminal 76 is also provided on the rear surface of the first wiring board 1 in the first embodiment of FIG.

  As described above, the third embodiment can reduce the number of parts such as the support 6, the second sheet 5, the bandpass filter 17 and the like, and can be reduced in height and more compact than the first embodiment. Can be obtained. In FIG. 14, the mask 50 is disposed on the reflecting portion 23 of the lens body 2, but the mask 50 may not be provided. Further, the third embodiment is characterized in that the lighting device is made compact, so that the space for storing the control electronic component 63 as in the first embodiment shown in FIG. The electronic component is provided outside the lighting device. Of course, the control electronic component may be mounted on the first wiring board 1.

  As described above, the preferred embodiments have been described with reference to the drawings. However, those skilled in the art will readily understand various changes and modifications within the obvious scope by looking at the present specification. Accordingly, such changes and modifications are to be construed as within the scope of the invention as defined by the appended claims.

DESCRIPTION OF SYMBOLS 1 1st wiring board 2 Lens body 3 2nd wiring board 4 1st sheet | seat 5 2nd sheet | seat 6 Support body 7 Case 8 Cover 10 Light-emitting body 12 Pressing member 22 Irradiation part 23 Reflection part 23a Recess 23b Flat surface 24 light guide portion 27 flat plate portion 31 light receiving element 50 mask 60 bottom wall of support 70 bottom wall of case

Claims (8)

A plurality of light emitters juxtaposed, a lens body disposed in front of the light emitter, and a light receiving element disposed behind the light emitter,
The lens body includes an irradiating unit that directs light emitted from the illuminant in a predetermined direction, and each illuminant that is disposed in the middle of a plurality of adjacent illuminating units and enters a region outside the irradiating unit. An illuminating device comprising: a reflecting portion that reflects outgoing light backward; and a light guide portion that guides the reflected outgoing light to the light receiving element.   In Claim 1, The said reflection part has the recess recessed backward, and the flat surface around the front opening of this recess, The emitted light reflected inside the said flat surface is the side surface of the said recess. Lighting device that is reflected on the back side of the camera and heads backward.   In Claim 2, the recess of the said reflection part is formed in the square pyramid shape located in the center of the square which connected the center of the four light-emitting bodies adjacent in planar view, and the said square pyramid goes back. A lighting device having a tapered shape and each side surface of which corresponds to each corresponding light emitter.   The illuminating device according to any one of claims 1 to 3, wherein the light guide portion has a tapered shape toward the rear. 5. The lighting device according to claim 1, wherein the first wiring board on which the light emitter is mounted, the second wiring board on which the light receiving element is mounted, and an electrically insulating first wiring board. The first and second sheets, a highly thermally conductive support having a cross-sectional shape with a cross-section opened rearward, the lens body, the first and second wiring boards, and the first and second sheets are accommodated. With a high thermal conductivity case
The first wiring board is supported on the front surface of the bottom wall of the support via the first sheet,
The second wiring board is supported on the rear surface of the bottom wall of the support via the second sheet,
The lighting device in which rear surfaces of both side walls of the support are in contact with a bottom wall of the case.   6. The cover according to claim 5, further comprising a cover that covers the front opening of the case, and a lens body that is interposed between the cover and the lens body to press the support body against the bottom wall of the case. A lighting device comprising a pressing member.   The illuminating device according to claim 1, further comprising a mask that exposes the irradiation portion of the lens body and covers the reflection portion from the front.   The lighting device according to any one of claims 1 to 4 and 6 to 7, wherein the light emitter is mounted on a front surface of a first wiring board, and the light receiving element is mounted on a rear surface of the first wiring board. The mounted lighting device.

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