Double-sided illumination device

Abstract

To improve the ease of assembly to the object being assembled. [Solution] In the lighting device 20, the detection plate 52 of the capacitance sensor 50, the light guide plate 60 for the mirror, the light guide plate 62 for the map lamp, the light source 70 for the mirror, and the light source 72 for the map lamp are housed in the case 32 of the housing 30, and the case 32 is light-transmitting. Therefore, the lighting device 20, with these parts in a unitized state, can be assembled to the sun visor 10 to be installed. This improves the ease of assembly of the lighting device 20 to the sun visor 10 compared to, for example, a configuration in which the housing 30 of the lighting device 20 is omitted and these parts are assembled to the sun visor 10 separately.

Description

Technical Field

[0001] The present invention relates to a two-sided light-emitting illumination device.

Background Art

[0002] Patent Document 1 below describes an in-vehicle illumination device provided in a visor of an automobile. The in-vehicle illumination device has a flexible wiring board provided inside the visor, a light source for a map lamp and a light source for a vanity mirror provided on the flexible wiring board, and a capacitance sensor provided on the flexible wiring board. When the approach of an operator's finger is detected by the capacitance sensor at the deployed position of the visor, the covers on both sides of the vanity mirror provided on the back surface of the visor body are illuminated by the light source for the vanity mirror. On the other hand, when the approach of an operator's finger is detected by the capacitance sensor at the stored position of the visor, the map lamp provided on the front surface of the visor body is illuminated by the light source for the map lamp.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the above in-vehicle illumination device has room for improvement in the following points. That is, in the above in-vehicle illumination device, the flexible wiring board, the cover for the map lamp and the cover for the vanity mirror that are the illumination targets are separately provided on the visor. Therefore, the assemblability to the assembly object (visor) of the in-vehicle illumination device may be reduced. Thus, the above in-vehicle illumination device has room for improvement in terms of improving the assemblability to the assembly object.

[0005] In consideration of the above facts, the present invention provides a double-sided emitting illumination device that can improve the ease of assembly to the object to be assembled. [Means for solving the problem]

[0006] One or more embodiments of the present invention are double-sided emitting illumination devices comprising: a detection plate constituting part of a capacitive sensor for detecting the approach of an operator; a first light guide provided on one side of the detection plate in the thickness direction; a second light guide provided on the other side of the detection plate in the thickness direction; a first light source provided on one side of the first light guide in an orthogonal direction perpendicular to the thickness direction, which irradiates the emitted light to the other side in the orthogonal direction; a second light source provided on one side of the second light guide in an orthogonal direction, which irradiates the emitted light to the other side in the orthogonal direction; and a housing including a light-transmitting case that accommodates the detection plate, the first light guide, the second light guide, the first light source, and the second light source. [Effects of the Invention]

[0007] According to one or more embodiments of the present invention, the ease of assembly to the object to be assembled can be improved. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view from the front of a sun visor to which the double-sided emitting illumination device according to this embodiment is applied. [Figure 2] Figure 1 is a perspective view of the sun visor from the rear. [Figure 3] Figure 2 is a three-view drawing showing the entire double-sided illumination device. [Figure 4] Figure 3 is an exploded perspective view of the double-sided illumination device shown. [Figure 5] This is a rear-view cross-sectional view (section 5-5 in Figure 3) showing the inside of the double-sided illumination device shown in Figure 3. [Figure 6] This is a cross-sectional view from the right side (section 6-6 in Figure 3) showing the inside of the double-sided illumination device shown in Figure 3. [Figure 7] This is a cross-sectional view corresponding to Figure 5, showing a double-sided illuminating device to which a modified case has been applied. [Figure 8] This is a cross-sectional view corresponding to Figure 6 of the double-sided illuminating device shown in Figure 7. [Figure 9] Figure 8 shows a cross-sectional view from above (section 9-9 in Figure 8) of the inside of the double-sided illumination device. [Modes for carrying out the invention]

[0009] Hereinafter, the double-sided emitting illumination device 20 (hereinafter simply referred to as the illumination device 20) according to this embodiment will be described with reference to the drawings. The illumination device 20 is applied to the sun visor 10 of a vehicle (automobile), and the sun visor 10 is provided at the front end of the ceiling of the vehicle. The arrows UP, FR, and RH shown in the drawings indicate the upper side, front side, and right side of the vehicle, respectively. In the following description, when using up and down, front and back, and left and right, unless otherwise specified, they refer to the vehicle's vertical direction, front and back direction, and left and right direction.

[0010] As shown in Figures 1 and 2, the sun visor 10 is formed in a hollow, substantially rectangular plate shape with the front-to-back direction as the thickness direction and the left-to-right direction as the longitudinal direction. At the upper end of the sun visor 10, a first notch 10A is formed at the left end. The first notch 10A is formed as a concave shape that is open to the upper and left sides when viewed from the front-to-back direction. At the upper end of the sun visor 10, a second notch 10B is formed on the right side. The second notch 10B is formed as a concave shape that is open to the upper side when viewed from the front.

[0011] The upper end of the sun visor 10 is supported by a hinge shaft 12 so as to be rotatable in the left-right direction as its axial direction. The hinge shaft 12 protrudes to the left from the upper end of the sun visor 10 and is located within the first notch 10A. The left end of the hinge shaft 12 is bent upward and connected to the ceiling of the vehicle. A locking shaft 14 is provided at the upper end of the sun visor 10 within the second notch 10B. The locking shaft 14 extends in the left-right direction, and both longitudinal ends of the locking shaft 14 are fixed to the sun visor 10. The locking shaft 14 is rotatably locked to a locking part (not shown) provided on the ceiling of the vehicle, thereby connecting the sun visor 10 to the ceiling of the vehicle. The sun visor 10 is rotatable between a stowed position where the rear wall faces the ceiling and an extended position where the front wall faces forward.

[0012] A mirror hole 10C is formed through the left side of the rear wall of the sun visor 10. The mirror hole 10C is formed in a substantially rectangular shape with the left-right direction as its longitudinal direction. A mirror cover 16 is provided inside the sun visor 10, and the mirror cover 16 is connected to the sun visor 10 so as to be slidable in the left-right direction. Specifically, the mirror cover 16 is configured to slide between a closed position (position shown in Figure 2) that closes the mirror hole 10C and an open position (not shown) that is slid to the right from the closed position. A vanity mirror (not shown) is provided inside the sun visor 10. When the mirror cover 16 is slid to the open position, the vanity mirror is exposed from the mirror hole 10C. Here, a switch (not shown) for detecting the open position of the mirror cover 16 is provided inside the sun visor 10, and the switch is electrically connected to the vehicle's control unit 80 (see Figure 6).

[0013] A hole 10D for mirror illumination is formed through the rear wall of the sun visor 10 to the left of the mirror hole 10C. The hole 10D for mirror illumination is formed in a substantially rectangular shape with the vertical direction as its longitudinal direction. A hole 10E for lamp illumination is formed through the left side of the front wall of the sun visor 10. The hole 10E for lamp illumination is formed in a substantially rectangular shape with the vertical direction as its longitudinal direction. The hole 10E for lamp illumination and the hole 10D for mirror illumination are positioned opposite each other in the front-to-back direction. An illumination device 20 is provided inside the left side of the sun visor 10. A portion of the rear of the illumination device 20 is exposed through the hole 10D for mirror illumination, and a portion of the front of the illumination device 20 is exposed through the hole 10E for lamp illumination.

[0014] (Regarding lighting device 20) As shown in Figures 3 to 6, the lighting device 20 is formed as a roughly rectangular parallelepiped with the front-to-back direction as the thickness direction and the up-to-down direction as the longitudinal direction. The lighting device 20 is composed of a housing 30, a substrate 40, a capacitance sensor 50, a mirror light guide plate 60 as a first light guide, a map lamp light guide plate 62 as a second light guide, a pair of left and right mirror light sources 70 as a first light source, and a pair of left and right map lamp light sources 72 as a second light source.

[0015] (Regarding Housing 30) The housing 30 constitutes the outer casing of the lighting device 20. The housing 30 includes a case 32 and a lid member 34. The case 32 is made of a light-transmitting material (in this embodiment, a resin material). The case 32 is formed in a substantially flattened box shape that is open to the top and has its thickness in the front-to-back direction. The case 32 is formed in a substantially rectangular shape with its longitudinal direction in the vertical direction when viewed from the front.

[0016] On the rear surface of the case 32, a mirror illumination unit 32A is formed. The mirror illumination unit 32A is formed in a rectangular shape similar to the mirror illumination hole portion 10D when viewed from the rear side, and protrudes from the case 32 to the rear side. The mirror illumination unit 32A is fitted into the mirror illumination hole portion 10D of the case 32 and is exposed to the rear side from the mirror illumination hole portion 10D. On the front surface of the case 32, a map lamp illumination unit 32B is formed. The map lamp illumination unit 32B is formed in a rectangular shape similar to the lamp illumination hole portion 10E when viewed from the front side, and protrudes from the case 32 to the front side. The map lamp illumination unit 32B is fitted into the lamp illumination hole portion 10E of the case 32 and is exposed to the front side from the lamp illumination hole portion 10E.

[0017] On the inner peripheral portion of the case 32, case-side support columns 32C for supporting a substrate 40 described later are integrally provided at the four corner portions. The case-side support columns 32C are formed in a substantially rectangular columnar shape extending in the vertical direction. The upper surface of the case-side support columns 32C is located below the upper end surface of the case 32.

[0018] The lid member 34 constitutes the outer contour of the upper end portion of the lighting device 20. The lid member 34 is formed in a substantially rectangular plate shape with the vertical direction as the plate thickness direction, is disposed adjacent to the upper side of the case 32, and closes the upper opening of the case 32. A fitting cylinder portion 34A is provided on the outer peripheral portion of the lower surface of the lid member 34. The fitting cylinder portion 34A is formed in a substantially rectangular cylindrical shape with the vertical direction as the axial direction, and is disposed at a position one step lower than the outer shape of the lid member 34. The fitting cylinder portion 34A is fitted into the upper opening of the case 32, and the lid member 34 is fixed to the case 32.

[0019] Multiple (six in this embodiment) lid-side support columns 34B for supporting the substrate 40, which will be described later, are integrally formed in the fitting cylinder portion 34A. Four of the lid-side support columns 34B are provided at the corners of the fitting cylinder portion 34A. The other lid-side support columns 34B are provided in the middle of the front and rear walls of the fitting cylinder portion 34A in the left-right direction. The lid-side support columns 34B are formed in a substantially rectangular column shape that extends in the vertical direction, and the lower end of the lid-side support columns 34B protrudes downward from the fitting cylinder portion 34A. A connector portion 34C is formed on the right side of the lid member 34. The connector portion 34C is formed in a rectangular cylindrical shape and protrudes upward from the lid member 34. The inside of the connector portion 34C is vertically penetrating.

[0020] (Regarding circuit board 40) The substrate 40 is formed in a substantially rectangular plate shape with the thickness direction in the vertical direction (corresponding to the orthogonal direction of the present invention) and the longitudinal direction in the horizontal direction. The substrate 40 is housed within the upper end of the case 32. The four corners of the substrate 40 are sandwiched from both the vertical and horizontal sides by the case-side support pillars 32C of the case 32 and the lid-side support pillars 34B of the lid member 34, thereby fixing the substrate 40 to the housing 30. A connector 42 is provided on the right side of the upper surface (one side in the vertical direction) of the substrate 40. The connector 42 has a plurality of terminals 42A, which are arranged within the connector portion 34C. The terminals 42A are connected to an external connector (not shown).

[0021] (Regarding the capacitive sensor 50) The capacitance sensor 50 comprises a detection plate 52 and a sensor circuit section 54 provided on the upper surface of the substrate 40. The detection plate 52 is made of a metal (conductor) such as silver and has reflectivity that allows it to reflect light. The detection plate 52 is formed in a substantially rectangular plate shape with the front-to-back direction as the plate thickness direction and the up-to-down direction as the longitudinal direction, and is housed inside the housing 30 on the lower side of the substrate 40. The upper end of the detection plate 52 is connected to the substrate 40 and is also electrically connected to the sensor circuit section 54. The sensor circuit section 54 is electrically connected to the vehicle's control unit 80. The capacitance sensor 50 detects the fingers of an operator approaching the lighting device 20, and the control unit 80 detects the operator's touch on the lighting device 20 in response to the detection signal from the capacitance sensor 50.

[0022] (Regarding the light guide plate 60 for the mirror) The mirror light guide plate 60 is made of a light-transmitting material. The mirror light guide plate 60 is arranged in a substantially rectangular shape with the front-to-back direction being the thickness direction and the up-to-down direction being the longitudinal direction. The mirror light guide plate 60 is positioned adjacent to the rear side of the detection plate 52 (one side in the thickness direction of the detection plate 52) and is fixed to the rear surface of the detection plate 52. Multiple first reflective grooves 60A are formed on the front surface of the mirror light guide plate 60 (the surface facing the detection plate 52 in the front-to-back direction) as first reflective parts. The first reflective grooves 60A are formed in a groove shape that extends in the left-to-right direction and opens to the front, and are formed in a substantially semicircular shape that opens to the front when viewed from the left-to-right direction. Multiple first reflective grooves 60A are arranged at predetermined intervals in the up-to-down direction and at equal intervals in the up-to-down direction.

[0023] (Regarding the light guide plate 62 for the map lamp) The map lamp light guide plate 62, like the mirror light guide plate 60, is made of a light-transmitting material. The map lamp light guide plate 62 has a structure that is the mirror light guide plate 60 inverted front to back. That is, the map lamp light guide plate 62 is arranged in a substantially rectangular plate shape with the front-to-back direction as the plate thickness direction and the up-to-down direction as the longitudinal direction. The map lamp light guide plate 62 is positioned adjacent to the front side of the detection plate 52 (the other side in the plate thickness direction of the detection plate 52) and is fixed to the front surface of the detection plate 52. In addition, multiple second reflective grooves 62A are formed on the rear surface of the map lamp light guide plate 62 (the surface facing the detection plate 52 in the front-to-back direction) as second reflective parts. The second reflective grooves 62A are formed in a groove shape that extends in the left-to-right direction and opens to the rear, and are formed in a substantially semicircular shape that opens to the rear when viewed from the left-to-right direction. Multiple second reflective grooves 62A are arranged at predetermined intervals in the up-to-down direction and at equal intervals in the up-to-down direction.

[0024] (Regarding the Mirror Light Source 70) As shown in Figure 6, the mirror light source 70 is an LED (Light Emitting Diode). The mirror light source 70 is provided on the lower surface (the other side in the vertical direction) of the substrate 40 and is positioned above the mirror light guide plate 60. Specifically, a pair of mirror light sources 70 are positioned on the left and right sides outward relative to the left-right center of the substrate 40 (in Figure 6, only the mirror light source 70 positioned to the left of the left-right center of the substrate 40 is shown). The mirror light source 70 is electrically connected to the vehicle's control unit 80, and the control unit 80 causes the mirror light source 70 to emit light. The mirror light source 70 directs the emitted light downwards (towards the mirror light guide plate 60). The light that enters the mirror light guide plate 60 is then reflected to the rear by the first reflection groove 60A, and the mirror illumination unit 32A of the lighting device 20 is illuminated by this light.

[0025] (Regarding the light source 72 for the map lamp) The map lamp light source 72 is an LED, similar to the mirror light source 70. The map lamp light source 72 is located on the underside of the substrate 40 and above the map lamp light guide plate 62. The pair of map lamp light sources 72 are positioned on the left and right sides outward relative to the left-right center of the substrate 40, similar to the mirror light source 70 (in Figure 6, only the map lamp light source 72 positioned to the left of the left-right center of the substrate 40 is shown). The map lamp light source 72 is electrically connected to the vehicle's control unit 80, and the control unit 80 causes the map lamp light source 72 to emit light. The map lamp light source 72 directs the emitted light downwards (towards the map lamp light guide plate 62). The light that enters the map lamp light guide plate 62 is then reflected forward by the second reflection groove 62A, and the map lamp illumination section 32B of the lighting device 20 is illuminated by this light.

[0026] (Effects and Benefits) Next, the effects and advantages of this embodiment will be described.

[0027] In the sun visor 10 configured as described above, when the mirror cover 16 slides from the closed position to the open position by the operator's operation, the control unit 80 detects the open position of the mirror cover 16 based on a detection signal from the switch. When the control unit 80 detects the open position of the mirror cover 16, the control unit 80 causes the mirror light source 70 to emit light. As a result, with the vanity mirror exposed, the mirror illumination unit 32A of the lighting device 20 is illuminated, and light is emitted from the mirror illumination unit 32A toward the rear.

[0028] Furthermore, when the sun visor 10 is rotated to its stowed position so that its rear surface faces the ceiling of the vehicle, and the operator touches the map lamp illumination unit 32B of the lighting device 20, the control unit 80 detects the touch to the map lamp illumination unit 32B based on the detection signal from the capacitance sensor 50. When the control unit 80 detects the touch to the map lamp illumination unit 32B, the control unit 80 causes the map lamp light source 72 to emit light. As a result, the map lamp illumination unit 32B of the lighting device 20 is illuminated, and light is emitted from the map lamp illumination unit 32B towards the interior of the vehicle (downward).

[0029] In the lighting device 20, the detection plate 52 of the capacitance sensor 50, the light guide plate 60 for the mirror, the light guide plate 62 for the map lamp, the light source 70 for the mirror, and the light source 72 for the map lamp are housed in the case 32 of the housing 30, and the case 32 is light-transmitting. Therefore, the lighting device 20, with these components unitized, can be assembled to the sun visor 10, which is the object to be assembled. This improves the ease of assembly of the lighting device 20 to the sun visor 10 compared to, for example, a configuration in which the housing 30 of the lighting device 20 is omitted and these components are assembled to the sun visor 10 separately.

[0030] Furthermore, a substrate 40 is provided above the detection plate 52, the mirror light guide plate 60, and the map lamp light guide plate 62, with the vertical direction being the thickness direction, and the mirror light source 70 and the map lamp light source 72 are provided on the lower surface of the substrate 40. This allows the mirror light source 70 and the map lamp light source 72 to be concentrated and arranged above the detection plate 52, the mirror light guide plate 60, and the map lamp light guide plate 62, thereby making the entire lighting device 20 more compact.

[0031] Furthermore, the mirror light guide plate 60 and the map lamp light guide plate 62 are formed in a flat plate shape with the front-to-back direction as the thickness direction. In other words, the thickness direction of the detection plate 52 coincides with the thickness direction of the mirror light guide plate 60 and the map lamp light guide plate 62. The detection plate 52 is sandwiched between the mirror light guide plate 60 and the map lamp light guide plate 62 from both the front-to-back sides. This makes it possible to make the lighting device 20 thinner in the front-to-back direction (the thickness direction of the sun visor 10) while arranging the lighting device 20 inside the sun visor 10.

[0032] Furthermore, a first reflective groove 60A is formed on the front surface (the surface facing the detection plate 52) of the mirror light guide plate 60 to reflect the light received from the mirror light source 70 to the rear side (the side opposite to the detection plate 52). In addition, a second reflective groove 62A is formed on the rear surface (the surface facing the detection plate 52) of the map lamp light guide plate 62 to reflect the light received from the map lamp light source 72 to the front side (the side opposite to the detection plate 52). This makes it possible to make the mirror light guide plate 60 (map lamp light guide plate 62) thinner while reflecting the light received by the mirror light guide plate 60 (map lamp light guide plate 62) from the mirror light source 70 (map lamp light source 72) to the side opposite to the detection plate 52, thereby illuminating the mirror illumination section 32A (map lamp illumination section 32B).

[0033] Furthermore, the detection plate 52 is a conductive material made of a silver-colored metal. In other words, the detection plate 52 is reflective. This allows the light that enters the mirror light source 70 (map lamp light source 72) into the mirror light guide plate 60 (map lamp light guide plate 62) to be reflected by the detection plate 52 towards the mirror illumination unit 32A (map lamp illumination unit 32B), thereby efficiently illuminating the mirror illumination unit 32A (map lamp illumination unit 32B). In addition, the detection plate 52 can suppress the leakage of light that enters the mirror light source 70 (map lamp light source 72) into the mirror light guide plate 60 (map lamp light guide plate 62) towards the map lamp light guide plate 62 (mirror light guide plate 60).

[0034] (Variation of Case 32) Next, a modified example of case 32 will be described using Figures 7 to 9. In the modified example of case 32, a light-shielding portion 36 is provided on the inner circumferential surface of case 32. The light-shielding portion 36 is made of a resin material that cannot transmit light, and the light-shielding portion 36 and case 32 are integrally formed by a method such as two-color molding. The light-shielding portion 36 is integrally provided on all surfaces of the inner circumferential surface of case 32 except for the front surface (the surface facing the map lamp light guide plate 62 in the front-rear direction) and the rear surface (the surface facing the mirror light guide plate 60 in the front-rear direction). That is, the light-shielding portion 36 is integrally provided on the left and right sides and the bottom surface of the inner circumferential surface of case 32. In the modified example of case 32, the case-side support column 32C is omitted, and both left and right ends of the substrate 40 are supported from below by the light-shielding portion 36.

[0035] A fitting groove 36A is formed on the inner circumferential surface of the light-shielding portion 36, into which the left and right outer periphery portions and the lower outer periphery portion of the detection plate 52 fit. That is, the fitting groove 36A extends along the circumferential direction of the detection plate 52. As a result, the inside of the case 32 is partitioned in the front-to-back direction by the detection plate 52. Therefore, in the lighting device 20 to which the modified case 32 is applied, the leakage of light from the mirror light source 70 (map lamp light source 72) into the mirror light guide plate 60 (map lamp light guide plate 62) to the map lamp light guide plate 62 (mirror light guide plate 60) can be further suppressed. Furthermore, the light-shielding portion 36 is integrally provided on the inner circumferential surface of the case 32, excluding the front and rear surfaces, and the fitting groove 36A is formed in the light-shielding portion 36. This effectively suppresses the leakage of light from the mirror light source 70 (map lamp light source 72) into the mirror light guide plate 60 (map lamp light guide plate 62) to the map lamp light guide plate 62 (mirror light guide plate 60).

[0036] In the modified case 32, the fitting groove 36A is formed in the light-shielding portion 36, but the fitting groove 36A may also be applied to the case 32 of this embodiment. That is, the thickness of the left and right side walls and the bottom wall of the case 32 may be set to be thicker than in this embodiment, and the fitting groove 36A may be formed on the left and right side surfaces and the bottom surface of the inner circumferential surface of the case 32.

[0037] Furthermore, in this embodiment, the mirror light source 70 is configured to emit light when the mirror cover 16 slides from the closed position to the open position by the operator's operation. However, for example, a switch (not shown) is provided inside the sun visor 10, which is electrically connected to the vehicle's control unit 80 and detects the deployed position of the sun visor 10. The control unit 80 detects the deployed position of the sun visor 10 based on the detection signal from the switch, and when it detects a touch on the mirror illumination unit 32A based on the detection signal from the capacitive sensor 50, the control unit 80 is configured to emit light from the mirror light source 70.

[0038] Furthermore, the present invention is not limited to the embodiments described above, and various modifications are possible without departing from the spirit of the invention. [Explanation of Symbols]

[0039] 20 Double-sided illumination device 30 Housing 32 cases 36 Light-shielding part 36A Fitting groove 40 circuit boards 50 Capacitive Sensors 52 Detection plate 60. Light guide plate for mirror (first light guide) 60A First reflective groove (first reflective section) 62. Light guide plate for map lamp (second light guide) 62A 2nd reflective groove (2nd reflective part) 70 Light source for mirror (first light source) 72. Light source for map lamp (second light source)

Claims

1. A detection plate which constitutes part of a capacitive sensor that detects the approach of an operator, A first light guide is provided on one side of the detection plate in the thickness direction, A second light guide is provided on the other side of the detection plate in the thickness direction, A first light source is provided on one side of the first light guide in a direction perpendicular to the plate thickness direction, and irradiates the emitted light to the other side in the same direction. A second light source is provided on one side of the second light guide in the direction perpendicular to the second light guide, and irradiates the emitted light to the other side in the direction perpendicular to the second light guide, A housing including the detection plate, the first light guide, the second light guide, the first light source, and a light-transmitting case that houses the second light source, A double-sided illuminating device equipped with this feature.

2. A substrate is provided on one side of the detection plate, the first light guide, and the second light guide in the orthogonal direction, with the orthogonal direction being the thickness direction. The double-sided light-emitting illumination device according to claim 1, wherein the first light source and the second light source are provided on the other side surface of the substrate in the orthogonal direction.

3. The first light guide and the second light guide are formed in a flat plate shape with the plate thickness direction as the plate thickness direction, A first reflective portion is formed on the opposing surface of the first light guide that faces the detection plate, for reflecting light received from the first light source to one side in the plate thickness direction. The double-sided light-emitting illumination device according to claim 1 or claim 2, wherein a second reflective portion is formed on the opposing surface of the second light guide that faces the detection plate, for reflecting light received from the second light source to the other side in the plate thickness direction.

4. The double-sided emitting illumination device according to claim 1, wherein the detection plate is a reflective light guide.

5. The double-sided emitting illumination device according to claim 1, wherein the case has a fitting groove formed in which the outer periphery of the detection plate fits.

6. The inner circumferential surface of the case is provided with light-shielding portions that block light, except for the surfaces facing the first and second light guides in the thickness direction. The double-sided emitting illumination device according to claim 5, wherein the fitting groove is provided in the light-shielding portion.

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