Light receiving device

Abstract

To facilitate easy and inexpensive configuration of a reflective layer.SOLUTION: A light-receiving device 4 includes a cylindrical light guide part 5, a light-receiving part 6 arranged on the end part of the cylindrical inside part of the light guide part 5, a reflective part 7 provided along an inner circumferential surface 5Aa of the light guide part 5. The reflective part 7 includes a support plate 7A arranged along the inner circumferential surface 5Aa of the light guide part 5 and a reflective layer 7B provided on a plate surface of the support plate 7A.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a light receiving device. [Background technology]

[0002] A remote control light receiving device has been disclosed in, for example, Patent Document 1. This light receiving device has an infrared receiving window that allows infrared rays to pass through, a container that forms a space for installing the infrared receiving element together with the infrared receiving window, an infrared receiving element that is held so that its light receiving surface faces the space for installing the infrared receiving element from a wall surface of the container, and a reflective film layer that is provided on the wall surface of the container that faces the space for installing the infrared receiving element. Therefore, this light receiving device can receive infrared rays that enter the space for installing the infrared receiving element and are reflected by the reflective film layer. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-311683 A Summary of the Invention [Problem to be solved by the invention]

[0004] Patent Document 1 shows that the reflective film layer is composed of aluminum foil, mirror finish, plating finish, or reflective film. However, since the reflective film layer of aluminum foil or reflective film is thin and easily deformed, when the space for installing the infrared receiving element in the container is narrow, the installation is difficult and the workability is poor. In addition, the manufacturing cost is high with the mirror finish or plating finish. For this reason, improvements are desired to facilitate assembly and reduce manufacturing costs.

[0005] An object of the present invention is to provide a light-receiving device in which a reflective layer can be formed easily and inexpensively. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, a light-receiving device of one embodiment of the present invention comprises a cylindrical light-guiding section, a light-receiving section arranged at an end of the cylindrical interior of the light-guiding section, and a reflecting section provided along an inner surface of the light-guiding section, wherein the reflecting section includes a support plate arranged along the inner surface of the light-guiding section, and a reflective layer provided on a plate surface of the support plate. Effect of the Invention

[0007] According to the present invention, the reflective layer can be formed easily and inexpensively. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a front view of an apparatus to which a light receiving device according to an embodiment is applied. [Diagram 2] FIG. 2 is a schematic diagram of a usage form of the light receiving device according to the embodiment. [Diagram 3] FIG. 3 is a cross-sectional plan view of the light receiving device according to the embodiment. [Figure 4] FIG. 4 is a perspective view of a reflecting portion of the light receiving device according to the embodiment. [Diagram 5] FIG. 5 is a front view of a reflecting portion of the light receiving device according to the embodiment. [Figure 6] FIG. 6 is an assembled perspective view of the light receiving device according to the embodiment. [Figure 7] FIG. 7 is a cross-sectional front view of the light receiving device according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a mode for carrying out the invention (hereinafter, referred to as an embodiment) will be described in detail with reference to the drawings. Note that the present invention is not limited to the following embodiment. Furthermore, the components in the following embodiment include those that a person skilled in the art can easily imagine, those that are substantially the same, and those that are within the so-called equivalent range. Furthermore, the components disclosed in the following embodiment can be appropriately combined.

[0010] Fig. 1 is a front view of an apparatus to which a light receiving device according to an embodiment is applied, and Fig. 2 is a schematic diagram of a usage form of the light receiving device according to an embodiment.

[0011] 1, the device according to the present embodiment is an electronic device 1 mounted inside a vehicle, for example, an AV (Audio Visual) integrated car navigation device. The electronic device 1 has a display panel 2, a front panel 3, and a light receiving device 4.

[0012] The display panel 2 is formed in a rectangular shape, and has a display surface 2A on the front side. The front side is the surface viewed by operators 100A, 100B as shown in Fig. 2, and in the case of a car navigation device mounted inside a vehicle, it is disposed at the front of the vehicle, and therefore the surface faces toward the rear of the vehicle. The display surface 2A has a rectangular shape smaller than the rectangular shape of the display panel 2. For example, the display surface 2A of the display panel 2 can be a pressure-sensitive touch panel.

[0013] The front panel 3 is made of synthetic resin and is formed in a rectangular shape so as to surround the periphery of the display panel 2. The front panel 3 has a rectangular frame portion 3A that surrounds the periphery of the display panel 2, and a rectangular window portion 3Aa that exposes the display surface 2A of the display panel 2 inside the frame portion 3A.

[0014] The front panel 3 may be provided with a push button 3B. As shown in Fig. 1, the push button 3B is located on the frame portion 3A of the front panel 3, which in this embodiment is on the right side as you face the front panel 3 in Fig. 1, on the front side of the front panel 3. In this embodiment, a plurality of push buttons 3B (five buttons) are arranged vertically as shown in Fig. 1. The push button 3B operates a switch element provided on the back side thereof when pressed.

[0015] 2, the light receiving device 4 is for receiving a signal from a remote control device (remote controller) 10 held by an operator 100A or 100B. The electronic device 1 operates based on the signal received by the light receiving device 4.

[0016] The light receiving device 4 will be described in detail below. Fig. 3 is a plan view cross-sectional view (cross-sectional view taken along line AA in Fig. 1) of the light receiving device according to the embodiment. Fig. 4 is a perspective view of a reflecting portion of the light receiving device according to the embodiment. Fig. 5 is a front view of a reflecting portion of the light receiving device according to the embodiment. Fig. 6 is an assembled perspective view of the light receiving device according to the embodiment. Fig. 7 is a front view cross-sectional view (cross-sectional view taken along line BB in Fig. 3) of the light receiving device according to the embodiment.

[0017] In this embodiment, the light receiving device 4 is for receiving an infrared signal from the remote control device 10. The light receiving device 4 includes a light guiding section 5, a light receiving section 6, and a reflecting section .

[0018] The light guide 5 has a cylindrical main body 5A. In the embodiment, the main body 5A is formed in a cylindrical shape with a rectangular cross section along the circumferential direction. The main body 5A is not limited to a rectangular shape, and may be a polygonal or circular cylindrical shape along the circumferential direction. In the embodiment, the main body 5A is formed in a rectangular cylindrical shape along the circumferential direction, and the inner peripheral surface 5Aa has a short side portion and a long side portion as shown in FIG. 6. The main body 5A also includes a trapezoidal cylindrical shape as a configuration in which the inner peripheral surface 5Aa has a short side portion and a long side portion. The main body 5A is inserted from the back side into a hole 3Ab formed in the frame portion 3A of the front panel 3 so that the cylindrically extending ends face the front and back sides.

[0019] The light guide 5 has a light-transmitting section 5B formed in a closed portion of the front end of the main body 5A. The light-transmitting section 5B is formed of a material that transmits an infrared signal from the remote control device 10. That is, the light-transmitting section 5B is configured as a window that transmits infrared rays. The light-transmitting section 5B is formed to protrude from the closed portion of the front end of the main body 5A toward the front side, and is formed inside the main body 5A to be recessed toward the front side. The portion of the light-transmitting section 5B that protrudes from the closed portion of the front end of the main body 5A toward the front side fits into a hole 3Ab formed in the frame 3A of the front panel 3.

[0020] The light guide 5 has an opening at the end on the rear side of the main body 5A, and has flanges 5C extending outward from the edge of the opening. The flanges 5C are provided so as to intersect (orthogonally) in the front-rear direction. In this embodiment, as shown in Figs. 6 and 7, the flanges 5C are formed extending in opposite directions from opposing short sides of the main body 5A.

[0021] The light guide 5 has an abutment portion around the recess of the light-transmitting portion 5B toward the front side inside the main body 5A at a closed portion of the end on the front side of the main body 5A. As shown in Figs. 3 and 6, the abutment portion includes a plane 5Da facing the rear side around the recess of the light-transmitting portion 5B, and a protrusion 5Db protruding from the plane 5Da to the rear side.

[0022] The light receiving unit 6 is a light receiving element that receives an infrared signal from the remote control device 10. The light receiving unit 6 is mounted on a surface 6Aa facing the front side of the substrate 6A. The terminal 6a of the light receiving unit 6 is connected by soldering to a print pattern (not shown) formed on the surface 6Aa of the substrate 6A. As shown in FIG. 3, the substrate 6A is arranged with its surface 6Aa side abutting against the flange portion 5C of the light guide portion 5. As shown in FIG. 3 and FIG. 7, the substrate 6A has an abutment portion formed on the surface 6Aa side in a portion located inside the main body portion 5A of the light guide portion 5. The abutment portion includes the surface 6Aa of the substrate 6A and a protrusion 6Ab protruding from the surface 6Aa to the front side.

[0023] 3 to 7, the reflecting portion 7 is provided along the inner circumferential surface 5Aa inside the main body portion 5A of the light guiding portion 5, and serves to reflect the infrared rays that have transmitted through the light-transmitting portion 5B and guide them to the light-receiving portion 6. The reflecting portion 7 includes a support plate 7A and a reflective layer 7B.

[0024] The support plate 7A is formed in a plate shape from a resin material such as polyethylene terephthalate. The support plate 7A has elasticity. The support plate 7A has each plate portion 7Aa formed to match the short side portion and the long side portion of the inner peripheral surface 5Aa so as to follow the inner peripheral surface 5Aa inside the main body portion 5A of the light guide portion 5. In the embodiment, the plate portion 7Aa is formed extending in the front-rear direction, and the plate portion 7Aa is formed to match the two long side portions of the inner peripheral surface 5Aa of the main body portion 5A, which is formed in a rectangular cylindrical shape, on both sides of the plate portion 7Aa that matches one short side portion of the inner peripheral surface 5Aa of the main body portion 5A, and is provided continuously in the cylindrical circumferential direction. Therefore, the support plate 7A is formed such that the plate portion 7Aa is continuous in the circumferential direction except for a portion corresponding to one short side portion, and each plate portion 7Aa is bent so as to follow the rectangular inner peripheral surface 5Aa. 4 and 5, the support plate 7A is formed such that each plate portion 7Aa opens at an angle θ (for example, about 135 degrees) larger than 90 degrees with respect to the inner peripheral surface 5Aa of the main body portion 5A formed in a rectangular cylindrical shape. Therefore, when the support plate 7A is arranged inside the main body portion 5A, each plate portion 7Aa is bent at about 90 degrees and has an elastic force that spreads outward (in the direction of arrow F) of the cylindrical shape of the main body portion 5A. Note that, for the main body portion 5A formed in a circular cylindrical shape, the support plate 7A is formed in a C shape curved along the circular shape, and has an elastic force that spreads outward of the cylindrical shape.

[0025] The support plate 7A has abutment portions at its peripheral edge in the front-rear direction. The abutment portions abut against the abutment portions (flat surface 5Da, protrusions 5Db) of the main body portion 5A of the light guide portion 5 and the abutment portions (surface 6Aa, protrusions 6Ab) of the substrate 6A of the light receiving portion 6. At its peripheral edge on the front side, the abutment portion includes a protrusion 7Ab extending in the front direction from a plate portion 7Aa forming a short side of the support plate 7A, a protrusion 7Ab extending in the front direction from one plate portion 7Aa forming a long side of the support plate 7A, and a peripheral edge 7Ac which is the peripheral edge on the front side of the other plate portion 7Aa forming the long side of the support plate 7A. In this abutment portion, each protrusion 7Ab abuts against each flat surface 5Da which is an abutment portion of the main body 5A of the light guide 5, and the peripheral end 7Ac abuts against the protrusion 5Db which is an abutment portion of the main body 5A of the light guide 5. Meanwhile, the abutment portion includes, at its peripheral end portion on the rear side, a protrusion 7Ab extending in the rear direction from a plate portion 7Aa which forms a short side portion of the support plate 7A, a protrusion 7Ab extending in the rear direction from one plate portion 7Aa which forms a long side portion of the support plate 7A, and a peripheral end 7Ac which is a peripheral end portion on the rear side of the other plate portion 7Aa which forms the long side portion of the support plate 7A. In this abutment portion, each protrusion 7Ab abuts against the surface 6Aa which is an abutment portion of the substrate 6A of the light receiving unit 6, and the peripheral end 7Ac abuts against the protrusion 6Ab which is an abutment portion of the substrate 6A of the light receiving unit 6. The contact portion (projection piece 7Ab, peripheral end 7Ac) of the support plate 7A is in a symmetrical position even if it is inverted in the front-rear direction. There is also a form in which the projection 6Ab is not present in the contact portion. In the case of a form in which the projection 6Ab is not present, the two projection pieces 7Ab of the support plate 7A are in contact with the substrate 6A, and the peripheral end 7Ac is not in contact with the substrate 6A and is floating. The two projection pieces 7Ab form a contact surface S in a triangular range shown in FIG. 6 and FIG. 7. On the other hand, the peripheral end 7Ac does not contact the substrate 6A, thereby avoiding the contact of the support plate 7A with the light receiving unit 6. The non-contact peripheral end 7Ac is located outside the triangular contact surface S with respect to the substrate 6A, and therefore there is a concern that the support plate 7A may wobble in the front-rear direction. However, the support plate 7A is in close contact with the inner peripheral surface 5Aa of the main body 5A due to the reaction force of bending, so the non-contact portion does not wobble in the front-rear direction.

[0026] The reflective layer 7B is provided on the inner plate surface of the support plate 7A that is folded. The reflective layer 7B is made of, for example, a sheet made of aluminum or an alloy thereof, and is attached to the plate surface of the support plate 7A. The reflective layer 7B has layer portions 7Ba formed to match the plate portions 7Aa of the support plate 7A. The layer portions 7Ba are provided continuously in the same manner as the plate portions 7Aa. The layer portions 7Ba are provided, for example, about 1.5 mm away from the ends (peripheral edges 7Ac) on the front and back sides of the plate portions 7Aa.

[0027] In the light receiving device 4 configured in this manner, as shown in FIG. 6, the reflecting portion 7 is inserted into the main body 5A of the light guide 5 from the back side to the front side. At this time, the reflecting portion 7 is inserted while being bent smaller than the cylindrical shape of the main body 5A against the elastic force. The reflecting portion 7 is inserted along the inner peripheral surface 5Aa of the main body 5A except for one of the short sides of the inner peripheral surface 5Aa of the main body 5A, so that the workability of the insertion is good. Then, the reflecting portion 7 abuts against the front side inside the main body 5A of the light guide 5. Specifically, the reflecting portion 7 abuts against the front side by the fact that each protrusion 7Ab of the abutment abuts against each flat surface 5Da which is the abutment portion of the main body 5A, and the peripheral end 7Ac of the abutment abuts against the protrusion 5Db which is the abutment portion of the main body 5A of the light guide 5. As shown in FIG. 7, the reflecting portion 7 has a support plate 7A arranged in a U-shape along the inner peripheral surface 5Aa of the main body 5A, except for one of the short sides of the inner peripheral surface 5Aa. The reflecting portion 7 has a reflective layer 7B arranged on the bent inner plate surface of the support plate 7A. After that, the light receiving device 4 has the substrate 6A of the light receiving portion 6 attached to the flange portion 5C of the light guide portion 5 from the rear side, as shown in FIG. 3. At this time, the reflecting portion 7 abuts against the substrate 6A on the rear side. Specifically, the reflecting portion 7 abuts against the substrate 6A on the rear side, as each protrusion 7Ab of the abutment portion abuts against the surface 6Aa, which is the abutment portion of the substrate 6A, and the peripheral end 7Ac of the abutment portion abuts against the protrusion 6Ab, which is the abutment portion of the substrate 6A, on the rear side. In this way, the light receiving device 4 has the abutment portions of the support plate 7A of the reflector 7 abut against the abutment portions on the front and back sides, respectively, and the support plate 7A abuts against the inner surface 5Aa of the main body portion 5A due to the elastic force from the configuration shown in Figure 7, thereby positioning the reflector 7 inside the main body portion 5A.

[0028] Here, as shown in FIG. 7, the light receiving device 4 is disposed so that the reflecting portion 7 surrounds the light receiving portion 6. As shown in FIG. 3, the reflecting portion 7 is disposed so that the peripheral end is spaced apart from the substrate 6A by the projections 7Ab of the contacting portion contacting the surface 6Aa, which is the abutment portion of the substrate 6A, and the peripheral end 7Ac of the contacting portion contacting the projections 6Ab, which is the abutment portion of the substrate 6A, on the rear side. Therefore, the light receiving device 4 prevents the reflecting portion 7 from contacting the light receiving portion 6, the terminals 6a of the light receiving portion 6, or the printed pattern (not shown) of the substrate 6A, so that the light receiving portion 6 is not subjected to a load and the reflecting layer 7B does not short-circuit the circuit. Furthermore, even if the reflecting layer 7B is provided away from the peripheral end of the support plate 7A, the reflecting layer 7B does not short-circuit the circuit.

[0029] In addition, as shown in FIG. 2, the light receiving device 4 of the present embodiment is disposed on the right side as viewed from the front side in the electronic device 1 disposed in the center in the left-right direction inside the vehicle. In such a case, the operator 100A on the right side of the operator 100B sitting in the driver's seat or the passenger seat transmits an infrared signal from a relatively close position to the light receiving device 4 by the remote control device 10, and the operator 100B on the left side transmits an infrared signal from a relatively far oblique position to the light receiving device 4 by the remote control device 10. In response to such a situation, as shown in FIG. 7, the light receiving device 4 of the present embodiment has a support plate 7A disposed in a U-shape along the inner peripheral surface 5Aa of the main body 5A, except for one short side portion on the left side of the inner peripheral surface 5Aa of the main body 5A. Even if an infrared signal is transmitted by the remote control device 10 from a relatively far oblique position on the left side, the light receiving device 4 can appropriately reflect infrared rays toward the light receiving unit 6 because the reflecting portion 7 exists on the short side portion on the right side of the inner peripheral surface 5Aa of the main body 5A. In addition, when an infrared signal is transmitted by the remote control device 10 from relatively close on the right side, the support plate 7A is formed so as to exclude one of the short sides on the left side of the inner surface 5Aa of the main body portion 5A when viewed from the front side, but since the support plate 7A is arranged along each long side of the inner surface 5Aa of the main body portion 5A, the infrared light can be appropriately reflected toward the light receiving unit 6.

[0030] Thus, the light receiving device 4 of the embodiment comprises a cylindrical light guiding section 5, a light receiving section 6 arranged at the end of the cylindrical interior of the light guiding section 5, and a reflecting section 7 provided along the inner surface 5Aa of the light guiding section 5, and the reflecting section 7 includes a support plate 7A arranged along the inner surface 5Aa of the light guiding section 5, and a reflective layer 7B provided on the plate surface of the support plate 7A.

[0031] In this light-receiving device 4, the support plate 7A can be disposed along the inner peripheral surface 5Aa of the light-guiding section 5, and even the reflective layer 7B, which is a thin film and easily deformed, can be disposed along the inner peripheral surface 5Aa of the light-guiding section 5 via the support plate 7A, improving the workability of attaching the reflective section 7 and making it easy to configure the reflective section 7. Furthermore, according to this light-receiving device 4, the reflective layer 7B, which is a sheet made of aluminum or an alloy thereof, can be attached to the plate surface of the support plate 7A, so there is no need to provide the reflective layer 7B by mirror finishing, plating finishing, or vapor deposition, which have higher manufacturing costs compared to these, and the device can be configured at low cost.

[0032] In addition, in the embodiment of the light receiving device 4, the light guiding section 5 has a cylindrical inner surface 5Aa that is formed in a polygonal shape along the circumferential direction, and the reflecting section 7 is formed by continuously bending the support plate 7A along the polygonal inner surface 5Aa of the light guiding section 5.

[0033] According to this light receiving device 4, the support plate 7A is continuously bent to match the shape of the light guiding section 5, whose inner circumferential surface 5Aa is polygonal, so that the reflecting section 7 can be easily attached along the inner circumferential surface 5Aa of the light guiding section 5. Here, the reflecting section 7 is formed with a portion removed from the rectangular (polygonal) cylindrical inner circumferential surface 5Aa of the light guiding section 5, but the reflecting section 7 may be continuously bent along the polygonal inner circumferential surface 5Aa of the light guiding section 5. The light receiving device 4 is able to sufficiently reflect light to the light receiving section 6 by forming the reflecting section 7 by continuously bending along the polygonal inner circumferential surface 5Aa of the light guiding section 5.

[0034] Furthermore, in the light receiving device 4 of the embodiment, the light guiding section 5 has a cylindrical inner surface 5Aa formed in a polygonal shape having short sides and long sides along the circumferential direction, and the reflecting section 7 is formed so that the support plate 7A is continuous in the circumferential direction except for a portion corresponding to one of the short sides and is bent to fit along the polygonal inner surface 5Aa.

[0035] In this light receiving device 4, the support plate 7A is continuously bent except for a portion corresponding to one of the short sides of the polygonal light guiding section 5 whose inner circumferential surface 5Aa has short sides and long sides, and the support plate 7A can be bent small by using the bent portion. Therefore, when attaching the light receiving device 4 to the cylindrical light guiding section 5, the bent reflecting section 7 can be easily inserted. As a result, according to this light receiving device 4, the reflecting section 7 can be attached more easily along the inner circumferential surface 5Aa of the light guiding section 5. In addition, in this light receiving device 4, the support plate 7A is formed except for a portion corresponding to one of the short sides of the polygonal shape, and since the short side has a relatively small area, the effect of insufficient reflection on the light receiving section 6 can be suppressed.

[0036] In the light receiving device 4 of the embodiment, the reflecting section 7 has an elastic force that causes the support plate 7A to expand outside the cylindrical light guiding section 5.

[0037] According to this light receiving device 4, the support plate 7A is pressed along the cylindrical inner circumferential surface 5Aa of the light guiding section 5 by the elastic force, so that the installation state of the reflecting section 7 can be maintained.

[0038] Furthermore, in the light receiving device 4 of the embodiment, the reflecting portion 7 has an abutment portion (projection piece 7Ab, peripheral end 7Ac) formed at the peripheral end portion of the support plate 7A that does not have the reflective layer 7B, and abutment portions (surface 6Aa, projection 6Ab) against which the abutment portions (projection piece 7Ab, peripheral end 7Ac) abut are formed on the substrate 6A on which the light receiving portion 6 is mounted.

[0039] According to this light receiving device 4, by abutting the abutment portion (projection piece 7Ab, peripheral edge 7Ac) of the support plate 7A, which does not have a reflective layer 7B, against the abutment portion (surface 6Aa, projection 6Ab) of the substrate 6A of the light receiving section 6, the support plate 7A and the reflective layer 7B can be prevented from coming into contact with the light receiving section 6, thereby protecting the light receiving section 6. [Explanation of symbols]

[0040] 4 Light receiving device 5 light guide part 5Aa Inner Surface 6 Light receiving part 6A substrate 6Aa Surface (protruding part) 6Ab protrusion (protrusion) 7 Reflector 7A Support Board 7Ab tab (joint) 7Ac Zhou Duan (when connecting part) 7B Reflective layer

Claims

1. A cylindrical light guiding portion; A light receiving unit disposed at an end of a cylindrical interior of the light guiding unit; A reflecting portion provided along an inner peripheral surface of the light guiding portion; Equipped with The light guide portion has a cylindrical inner peripheral surface formed in a polygonal shape having short sides and long sides along a circumferential direction, A light-receiving device in which the reflective portion includes a support plate arranged along the inner surface of the light-guiding portion and a reflective layer provided on the plate surface of the support plate, the support plate being continuous in the circumferential direction except for a portion corresponding to one of the short side portions and being bent to fit along the inner surface of the polygonal shape.

2. A cylindrical light guiding portion; A light receiving unit disposed at an end of a cylindrical interior of the light guiding unit; A reflecting portion provided along an inner peripheral surface of the light guiding portion; Equipped with The reflecting portion includes a support plate arranged along the inner surface of the light-guiding portion and a reflecting layer provided on the plate surface of the support plate, and an abutment portion is formed on the peripheral end portion of the support plate that does not have the reflecting layer, and a bump portion against which the abutment portion abuts is formed on a substrate on which the light-receiving portion is mounted.

3. The light receiving device according to claim 1 , wherein the reflecting portion has an abutment portion formed on a peripheral end portion of the support plate that does not have the reflective layer, and a bump portion against which the abutment portion abuts is formed on a substrate on which the light receiving portion is mounted.

4. 4. The light receiving device according to claim 1, wherein the light guiding portion has a cylindrical inner surface formed in a polygonal shape along a circumferential direction, and the reflecting portion is formed by continuously bending the support plate along the polygonal inner surface of the light guiding portion.

5. The light receiving device according to claim 1 , wherein the reflecting portion has an elastic force that causes the support plate to expand outwardly of the cylindrical light guiding portion.

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