Light emitting device

Abstract

The utility model provides a light-emitting device. The present invention is provided with: a substrate including a first main surface and a second main surface; a light-emitting element located on the first main surface; and a light guide that includes an incident surface on which light emitted from the light-emitting element is incident and an exit surface on which light incident from the incident surface is emitted as exit light, a through-hole connecting the first main surface and the second main surface is provided in the substrate, and the light guide overlaps the through-hole when viewed in the normal direction of the first main surface, and the light guide is disposed in the through-hole when viewed in the normal direction of the second main surface. The emission surface emits emission light to both the first main surface side and the second main surface side.

Description

Technical Field

[0001] The utility model relates to a double-sided luminous device. Background Art

[0002] As a technology related to the existing light-emitting device, for example, a double-sided light-emitting body described in Patent Document 1 and a double-sided advertising type internally illuminated signboard incorporating the double-sided light-emitting body are known. The double-sided light-emitting body described in Patent Document 1 includes a substrate and a plurality of light-emitting elements. The substrate has electrical wiring. The electrical wiring is formed only on one surface of the substrate. The plurality of light-emitting elements are arranged almost regularly with respect to the substrate. In addition, the plurality of light-emitting elements are arranged facing each other on both surfaces of the substrate.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2010-286600

[0004] The structure of Patent Document 1 requires light emitters on both sides of the substrate, which increases the number of light emitters. Utility Model Content

[0005] Therefore, an object of the present invention is to provide a light emitting device capable of double-sided light emission without increasing the number of light emitting elements.

[0006] A light-emitting device according to one embodiment of the present invention comprises: a substrate including a first main surface and a second main surface; a light-emitting element located on the first main surface; a light guide including an incident surface for incident light emitted by the light-emitting element and an emission surface for emitting light incident from the incident surface as emitted light, wherein a through hole connecting the first main surface and the second main surface is provided on the substrate, the light guide overlaps with the through hole when observed in the normal direction of the first main surface, and the emission surface emits the emitted light to both the first main surface side and the second main surface side.

[0007] A light-emitting device according to one embodiment of the present invention comprises: a substrate including a first main surface and a second main surface; a light-emitting element which is a lead frame type LED; and a light guide including an incident surface for incident light emitted by the light-emitting element and an emission surface for emitting light incident from the incident surface as emitted light, wherein a through hole connecting the first main surface and the second main surface is provided on the substrate, wherein the light guide overlaps with the through hole when viewed in the normal direction of the first main surface, wherein the light-emitting element is arranged at a position overlapping with the through hole when viewed in the normal direction of the first main surface, and wherein the emission surface emits the emitted light to both the first main surface side and the second main surface side.

[0008] A light-emitting device according to one embodiment of the present invention comprises: a substrate, comprising the first main surface and the second main surface arranged along the normal direction of the first main surface; a light-emitting element, which is located on the first main surface; and one or more light guides, comprising an incident surface for incident light emitted by the light-emitting element and a boundary surface for reflecting the light incident from the incident surface as reflected light and emitting it as emitted light, wherein the boundary surface emits the light to both the first main surface side and the second main surface side.

[0009] According to the utility model, double-sided light emission can be achieved without increasing the number of light-emitting elements. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a perspective view of the light emitting device 10 according to the first embodiment.

[0011] Figure 2 It is a cross-sectional view taken along the line AA of the light emitting device 10 according to the first embodiment.

[0012] Figure 3 It is a cross-sectional view taken along the line BB of the light emitting device 10 according to the first embodiment.

[0013] Figure 4 It is a perspective view of a light emitting device 10a according to the second embodiment.

[0014] Figure 5 It is a cross-sectional view taken along the line AA of the light emitting device 10 a according to the second embodiment.

[0015] Figure 6 1 is an example of a cross-sectional view taken along the line BB of the light emitting device 10 according to the first embodiment and a brightness distribution.

[0016] Figure 7 It is an example of a cross-sectional view taken along the line BB of the light emitting device 10 a according to the second embodiment and a brightness distribution.

[0017] Figure 8 It is a perspective view of a light emitting device 10b according to the third embodiment.

[0018] Fig. 9 It is a cross-sectional view taken along the line AA of a light emitting device 10 b according to the third embodiment.

[0019] Fig.10 It is a cross-sectional view taken along line BB of the light emitting device 10 b according to the third embodiment.

[0020] Fig.11 It is a perspective view of the first principal surface side unit 7 a and the second principal surface side unit 7 b according to the fourth embodiment.

[0021] Fig.12 It is a perspective view of a light emitting device 10c according to a fourth embodiment.

[0022] Fig.13 It is a perspective view of a light emitting device 10d according to a fifth embodiment.

[0023] Fig.14 It is a perspective view of a light emitting device 10e according to the sixth embodiment.

[0024] Fig.15 It is a cross-sectional view taken along CC of a light emitting device 10 e according to the sixth embodiment.

[0025] Fig.16 It is a cross-sectional view taken along the line DD of a light emitting device 10 e according to the sixth embodiment.

[0026] Fig.17 (A) is a bottom view of the sensor 11 according to the sixth embodiment in a flat unfolded state. Fig.17 (B) is a cross-sectional view taken along the line EE of the sensor 11 according to the sixth embodiment when the sensor 11 is developed in a plan view.

[0027] Fig.18 It is a cross-sectional view taken along CC of a light emitting device 10 f according to a first modification.

[0028] Fig.19 It is a cross-sectional view taken along the line DD of a light emitting device 10 f according to the first modification.

[0029] Fig. 20 It is a cross-sectional view taken along CC of a light emitting device 10g according to a second modification.

[0030] Fig.21 It is a cross-sectional view taken along the line DD of a light emitting device 10g according to a second modification.

[0031] Fig. 22 It is a plan view of the light emitting device 10h according to the seventh embodiment as viewed in the Z-direction.

[0032] Fig.23 It is a cross-sectional view of the light emitting device 10h according to the seventh embodiment, taken along the line EE.

[0033] Fig.24 It is a cross-sectional view taken along FF of a light emitting device 10h according to the seventh embodiment.

[0034] Fig.25 This is an example of the reflected light L4 and the emitted light L2 in the light emitting device 10h according to the seventh embodiment.

[0035] Fig.26This is an example of the reflected light L4 and the emitted light L2 in the light emitting device 10h according to the seventh embodiment.

[0036] Fig. 27 It is a cross-sectional view taken along line EE of a light emitting device 10i according to a third modification. DETAILED DESCRIPTION

[0037] [First embodiment]

[0038] Hereinafter, a light emitting device 10 according to a first embodiment of the present invention will be described with reference to the drawings. Figure 1 It is a perspective view of the light emitting device 10 according to the first embodiment. Figure 2 It is a cross-sectional view taken along the line AA of the light emitting device 10 according to the first embodiment. Figure 3 is a cross-sectional view taken along line BB of the light emitting device 10 according to the first embodiment. Figure 1 and Figure 3 In the figure, only representative ones of the three light emitting elements 2, the three through holes 3 and the three light guides 4 are denoted by reference numerals.

[0039] The light emitting device 10 is used as a light emitting device for double-sided light emission and side light emission. As an example, Figure 1 As shown, the light emitting device 10 includes a substrate 1, three light emitting elements 2, and three light guides 4. Figure 1 As shown in FIG. 1 , the substrate 1 has a plate shape. Thus, the substrate 1 includes a first main surface S1 and a second main surface S2. Figure 1 As shown, in the present embodiment, the first principal surface S1 and the second principal surface S2 have long sides and short sides. Here, the direction in which the first principal surface S1 and the second principal surface S2 are arranged is defined as the Z-axis direction. One direction in the Z-axis direction is the Z+ direction. The other direction in the Z-axis direction is the Z-direction. In the present embodiment, the normal direction of the first principal surface S1 is the Z-axis direction. In addition, the normal direction of the second principal surface S2 is the Z-axis direction. That is, in the present embodiment, the first principal surface S1 is parallel to the second principal surface S2. In addition, as Figure 1 As shown, the first main surface S1 is located closer to the Z+ direction than the second main surface S2.

[0040] like Figure 1As shown, three through holes 3 are provided in the substrate 1. Here, the direction in which the long sides of the first main surface S1 and the second main surface S2 extend is defined as the X-axis direction. The X-axis direction is orthogonal to the Z-axis direction. One direction in the X-axis direction is the X+ direction. The other direction in the X-axis direction is the X-direction. In addition, the direction in which the short sides of the first main surface S1 and the second main surface S2 extend is defined as the Y-axis direction. The Y-axis direction is orthogonal to the X-axis direction and the Z-axis direction. One direction in the Y-axis direction is the Y+ direction. The other direction in the Y-axis direction is the Y-direction.

[0041] In this embodiment, if Figure 1 As shown, three light emitting elements 2 are respectively arranged corresponding to three through holes 3 and three light guides 4. In more detail, three sets of combinations including one light emitting element 2, one through hole 3, and one light guide 4 arranged along the X-axis direction are arranged along the X-axis direction. That is, three light emitting elements 2 are arranged along the X-axis direction. Three through holes 3 are arranged along the X-axis direction. Three light guides 4 are arranged along the X-axis direction. In addition, the three sets of combinations including one light emitting element 2, one through hole 3, and one light guide 4 have the same structure. Therefore, a combination including one light emitting element 2, one through hole 3, and one light guide 4 will be described.

[0042] The light emitting element 2 is located on the first main surface S1 of the substrate 1. The light emitting element 2 is a light emitting diode (LED). The light emitting element 2 emits light by a current flowing in the light emitting element 2. In this embodiment, the light emitting element 2 is a side-view type LED. Figure 1 As shown, the light emitting element 2 includes a light emitting surface S3. The light emitting surface S3 emits light when a current flows through the light emitting element 2. In this embodiment, the normal direction of the light emitting surface S3 is parallel to the X-axis direction. In addition, the light emitting surface S3 faces the X+ direction.

[0043] like Figure 1 As shown, when viewed in the normal direction of the first main surface S1, the through hole 3 has a rectangular shape. In addition, the through hole 3 connects the first main surface S1 and the second main surface S2. In more detail, the through hole 3 penetrates the substrate 1 in the normal direction of the first main surface S1. In addition, when viewed in the normal direction of the first main surface S1, the through hole 3 does not overlap with the light-emitting element 2. In more detail, the through hole 3 is in contact with the light-emitting surface S3. In addition, the through hole 3 is located at a position closer to the X+ direction than the light-emitting surface S3. That is, the light-emitting surface S3 and the through hole 3 are arranged in sequence in the X+ direction.

[0044] When viewed in the normal direction of the first main surface S1, the light guide 4 overlaps with the through hole 3. Figure 1 and Figure 2As shown, the light guide 4 has a portion located closer to the Z+ direction than the first main surface S1. In addition, the light guide 4 has a portion located closer to the Z- direction than the second main surface S2.

[0045] In this embodiment, if Figure 1 As shown, the shape of the light guide 4 is a cylinder. In addition, the axial direction of the cylinder is the X-axis direction. That is, the axial direction of the cylinder is consistent with the direction in which the three through holes 3 are arranged. In addition, in this specification, a cylinder is a cylinder whose outer edge of the cross section perpendicular to the axial direction has a circular shape.

[0046] The light guide 4 includes an incident surface S4, an emitting surface S5, and surfaces S6 and S7. Figure 1 and Figure 2 As shown, the incident surface S4 is the inner side surface of the cylinder. In addition, the exit surface S5 is the outer side surface of the cylinder. In addition, the surface S6 is the end surface of the light guide 4 in the X- direction. The surface S7 is the end surface of the light guide 4 in the X+ direction. That is, the normal direction of the surface S6 and the surface S7 is the X-axis direction. The incident surface S4 and the exit surface S5 are rough-machined.

[0047] The light guide 4 emits the light L1 incident from the incident surface S4 as the emitted light L2. In more detail, the light emitted by the light emitting element 2 is incident on the incident surface S4. The light guide 4 diffuses the light L1 incident on the incident surface S4 toward the inside of the light guide 4. The light diffused into the inside of the light guide 4 travels inside the light guide 4. The light guide 4 causes the light that travels inside the light guide 4 and reaches the emission surface S5 to be emitted from the emission surface S5 as the emitted light L2. The material of the light guide 4 includes, for example, silicone rubber.

[0048] like Figure 1 and Figure 2 As shown, the emission surface S5 has a portion located closer to the Z+ direction (first main surface side) than the first main surface S1. Thus, the emission surface S5 emits the emission light L2 to the first main surface side. In addition, the surfaces S6 and S7 have portions located closer to the Z+ direction (first main surface side) than the first main surface S1. In addition, when viewed in the normal direction of the first main surface S1, the emission surface S5 overlaps with the through hole 3. In addition, the emission surface S5 has a portion located closer to the Z- direction (second main surface side) than the second main surface S2. Thus, the emission surface S5 emits the emission light L2 to the second main surface side. That is, the emission surface S5 emits the light L2 to both the first main surface side and the second main surface side. In addition, when viewed in the normal direction of the first main surface S1, the surfaces S6 and S7 overlap with the through hole 3. In addition, the surfaces S6 and S7 have portions located closer to the Z- direction (second main surface side) than the second main surface S2.

[0049] The emission surface S5 is the outer side surface of the cylinder. In addition, the axial direction of the cylinder is the X-axis direction. Therefore, the light guide 4 emits the emission light L2 in all directions orthogonal to the X-axis direction. For example, the light guide 4 emits the emission light L2 in the Z+ direction. In addition, the light guide 4 emits the emission light L2 in the Z- direction. In addition, the light guide 4 emits the emission light L2 in the Y+ direction. In addition, the light guide 4 emits the emission light L2 in the Y- direction.

[0050] [Effect]

[0051] According to the light emitting device 10, it is possible to emit light from both sides without increasing the number of light emitting elements. In more detail, the substrate 1 is provided with a through hole 3 connecting the first main surface S1 and the second main surface S2. Thus, the light emitted by the light emitting element 2 located on the first main surface S1 of the substrate 1 can pass through the through hole 3 and reach the second main surface side. In addition, when viewed in the normal direction of the first main surface S1, the light guide 4 overlaps with the through hole 3. Thus, the light emitted by the light emitting element 2 is incident on the incident surface S4 on both the first main surface side and the second main surface side. The light guide 4 diffuses the light L1 incident from the incident surface S4 to the inside of the light guide 4. The emission surface S5 emits the light L1 incident from the incident surface S4 as the emission light L2. In more detail, the emission surface S5 emits the emission light L2 to both the first main surface side and the second main surface side. Thus, the light emitting device 10 is possible to emit light from both sides without arranging the light emitting element 2 on the second main surface S2 of the substrate 1. Therefore, according to the light emitting device 10 , double-sided light emission can be achieved without increasing the number of light emitting elements.

[0052] According to the light emitting device 10, it is possible to emit light sideways without increasing the number of light emitting elements. In more detail, the emission surface S5 is the outer surface of the cylinder. In addition, the axial direction of the cylinder is the X-axis direction. Therefore, the emission surface S5 has a portion located closer to the Y+ direction than the substrate 1. Thus, the emission surface S5 can emit the emission light L2 in the Y+ direction. In addition, the emission surface S5 has a portion located closer to the Y- direction than the substrate 1. Thus, the emission surface S5 can emit the emission light L2 in the Y- direction. As a result, according to the light emitting device 10, it is possible to emit light sideways without arranging the light emitting element 2 on the side of the substrate 1. Therefore, according to the light emitting device 10, it is possible to emit light sideways without increasing the number of light emitting elements.

[0053] According to the light emitting device 10, the number of light emitting elements can be further reduced. In more detail, the light emitting element 2 is a side-view type LED including a light emitting surface S3 and emitting light from the light emitting surface S3. In addition, the light emitted by the side-view type LED is not limited to only light that travels in the normal direction of the light emitting surface S3, but also includes light that includes a component in the normal direction of the light emitting surface S3. The light emitting surface S3 faces the X+ direction. In addition, the through hole 3 is located closer to the X+ direction than the light emitting surface S3. That is, as Figure 3As shown, the light emitted by the light emitting element 2 is incident on the incident surface S4 on both the first main surface side and the second main surface side. The light guide 4 diffuses the light L1 incident from the incident surface S4 to the inside of the light guide 4. The emission surface S5 emits the light L1 incident from the incident surface S4 as the emission light L2. Thus, the light emitting device 10 can improve the brightness on the second main surface side. Therefore, according to the light emitting device 10, the number of light emitting elements can be further reduced.

[0054] [Second embodiment]

[0055] Hereinafter, a light emitting device 10a according to a second embodiment of the present invention will be described with reference to the drawings. Figure 4 It is a perspective view of a light emitting device 10a according to the second embodiment. Figure 5 It is a cross-sectional view taken along the line AA of the light emitting device 10 a according to the second embodiment. Figure 6 1 is an example of a cross-sectional view taken along the line BB of the light emitting device 10 according to the first embodiment and a brightness distribution. Figure 7 FIG. 1 is a cross-sectional view of the light emitting device 10a at the BB position and an example of brightness distribution according to the second embodiment. Figure 4 In the figure, only representative ones of the three light emitting elements 2, the three through holes 3, the three light guides 4 and the three diffusers 5 are denoted by reference numerals. In addition, for the light emitting device 10a according to the second embodiment, only the parts different from the light emitting device 10 according to the first embodiment are described, and the rest are omitted.

[0056] The light emitting device 10a is different from the light emitting device 10 in that it further includes three diffusers 5. In addition, the three diffusers 5 are respectively provided corresponding to the three light emitting elements 2, the three through holes 3, and the three light guides 4. More specifically, in the present embodiment, three sets of combinations including one light emitting element 2, one through hole 3, one light guide 4, and one diffuser 5 arranged along the X-axis direction are arranged along the X-axis direction. The three sets of combinations including one light emitting element 2, one through hole 3, one light guide 4, and one diffuser 5 have the same structure. Therefore, a set of combinations including one light emitting element 2, one through hole 3, one light guide 4, and one diffuser 5 will be described.

[0057] The diffusion plate 5 diffuses the light emitted by the light emitting element 2. Figure 4As shown, the diffuser plate 5 has a rectangular parallelepiped shape. Thus, the diffuser plate 5 has an incident surface S8 and emission surfaces S9, S10, S11, S12, and S13. The incident surface S8 is the end surface of the diffuser plate 5 in the X- direction. The emission surface S9 is the end surface of the diffuser plate 5 in the X+ direction. The emission surface S10 is the end surface of the diffuser plate 5 in the Y- direction. The emission surface S11 is the end surface of the diffuser plate 5 in the Y+ direction. The emission surface S12 is the end surface of the diffuser plate 5 in the Z- direction. The emission surface S13 is the end surface of the diffuser plate 5 in the Z+ direction. In addition, the diffuser plate 5 is located closer to the X+ direction than the light-emitting surface S3. That is, the light-emitting surface S3, the incident surface S8, and the emission surface S9 are arranged in sequence in the X+ direction.

[0058] The diffuser 5 diffuses the light incident from the incident surface S8 toward the inside of the diffuser 5. The light diffused into the inside of the diffuser 5 travels inside the diffuser 5. The diffuser 5 causes the light that travels inside the diffuser 5 and reaches the emission surfaces S9, S10, S11, S12, and S13 to be emitted from the emission surfaces S9, S10, S11, S12, and S13 as emission light L3.

[0059] like Figure 4 and Figure 5 As shown in FIG. 1 , when viewed in the normal direction of the first main surface S1, the diffuser plate 5 overlaps with the through hole 3. More specifically, when viewed in the normal direction of the first main surface S1, the through hole 3 surrounds the diffuser plate 5. Figure 5 As shown, the diffuser plate 5 has a portion located closer to the Z+ direction than the first main surface S1. In addition, the diffuser plate 5 has a portion located closer to the Z- direction than the second main surface S2. The material of the diffuser plate 5 includes, for example, silicone rubber. In this embodiment, the diffuser plate 5 is transparent. In addition, the diffuser plate 5 is fixed to the substrate 1 by an adhesive (not shown).

[0060] The emission surfaces S9, S10, and S11 have a portion located closer to the Z+ direction (first principal surface side) than the first principal surface S1. In addition, the emission surface S13 is located closer to the Z+ direction (first principal surface side) than the first principal surface S1. Thus, the emission surfaces S9, S10, S11, and S13 emit the emission light L3 toward the first principal surface side. The emission surfaces S9, S10, and S11 have a portion located closer to the Z- direction (second principal surface side) than the second principal surface S2. In addition, the emission surface S12 is located closer to the Z- direction (second principal surface side) than the second principal surface S2. Thus, the emission surfaces S9, S10, S11, and S12 emit the emission light L3 toward the second principal surface side. That is, the emission surfaces S9, S10, S11, S12, and S13 emit the emission light L3 toward both the first principal surface side and the second principal surface side.

[0061] The light emitted from the light emitting element 2 and the emitted light L3 emitted from the emission surfaces S9 , S10 , S11 , S12 , and S13 of the diffuser plate 5 are incident on the incident surface S4 of the light guide 4 .

[0062] The light emitting device 10a described above also has the same effect as the light emitting device 10. In addition, according to the light emitting device 10a, it is possible to suppress the inconsistency of brightness. Figure 6 As shown in FIG. 1 , when the position of BB of the light emitting device 10 in the Z-axis direction is equal to the position of the light emitting element 2 in the Z-axis direction, the brightness at BB of the light emitting device 10 is the highest. In addition, the brightness at BB of the light emitting device 10 decreases as the position of BB in the Z-axis direction moves away from the position of the light emitting element 2 in the Z-axis direction. In the light emitting device 10a, the diffuser 5 diffuses the light emitted by the light emitting element 2. As a result, Figure 7 As shown, the maximum value of the brightness at BB of the light-emitting device 10a is lower than the maximum value of the brightness at BB of the light-emitting device 10. On the other hand, when viewed in the normal direction of the first main surface S1, the diffuser 5 overlaps with the through hole 3, and the emission light L3 is emitted to both the first main surface side and the second main surface side. As a result, at a position in the Z-axis direction away from the position in the Z-axis direction of the light-emitting element 2, the brightness at BB of the light-emitting device 10a is higher than the brightness at BB of the light-emitting device 10. Therefore, according to the light-emitting device 10a, it is possible to suppress the inconsistency of brightness.

[0063] [Third Embodiment]

[0064] Hereinafter, a light emitting device 10 b according to a third embodiment of the present invention will be described with reference to the drawings. Figure 8 It is a perspective view of a light emitting device 10b according to the third embodiment. Fig. 9 It is a cross-sectional view taken along the line AA of a light emitting device 10 b according to the third embodiment. Fig.10 is a cross-sectional view of the light emitting device 10b according to the third embodiment taken at BB. Figure 8 and Fig.10 In the figure, only representative ones of the three light emitting elements 2, the three through holes 3 and the three light guides 4 are marked with reference numerals. In addition, for the light emitting device 10b involved in the second embodiment, only the parts different from the light emitting device 10 involved in the first embodiment are described, and the rest are omitted.

[0065] The light emitting device 10 b is different from the light emitting device 10 in the type of the light emitting element 2 and the configuration of the light emitting element 2 .

[0066] In this embodiment, the light emitting element 2 is a lead frame type LED. The lead frame type LED emits light on the surface. Figure 8 and Fig. 9 As shown, the shape of the light emitting element 2 is a shell shape. Figure 8As shown, the light emitting element 2 includes an outer surface S14. In other words, the outer surface S14 of the light emitting element 2 is the surface of the light emitting element 2. The outer surface S14 emits light when a current flows through the light emitting element 2. The light emitted by the light emitting element 2 is incident on the incident surface S4 of the light guide 4.

[0067] like Figure 8 and Fig. 9 As shown in FIG. 1 , when viewed in the normal direction of the first main surface S1, the light emitting element 2 is arranged at a position overlapping with the through hole 3. More specifically, when viewed in the normal direction of the first main surface S1, the through hole 3 surrounds the light emitting element 2. Fig. 9 As shown, the light emitting element 2 has a portion located closer to the Z+ direction than the first main surface S1. In addition, the light emitting element 2 has a portion located closer to the Z- direction than the second main surface S2. The light emitting element 2 has wirings 21a and 21b. The wirings 21a and 21b are fixed to the substrate 1 by solder (not shown). Thus, the light emitting element 2 is fixed to the substrate 1. In addition, the outer surface S14 emits light to both the first main surface side and the second main surface side. The light emitted from the outer surface S14 is incident on the incident surface S4 of the light guide 4.

[0068] In the light emitting device 10b as described above, the same effect as that of the light emitting device 10 is achieved. More specifically, the light emitting element 2 is a lead frame type LED that emits light from the outer surface S14. In addition, when viewed in the normal direction of the first main surface S1, the light emitting element 2 is arranged at a position overlapping with the through hole 3. Fig.10 As shown, the light emitted by the light emitting element 2 is incident on the incident surface S4 on both the first principal surface side and the second principal surface side. The light guide 4 diffuses the light L1 incident from the incident surface S4 to the inside of the light guide 4. The emission surface S5 emits the light L1 incident from the incident surface S4 as the emission light L2. Thus, the light emitting device 10b can emit light from both sides and from the side without arranging the light emitting element 2 on the first principal surface S1 and the second principal surface S2 of the substrate 1. Therefore, according to the light emitting device 10b, it is possible to emit light from both sides and from the side without increasing the number of light emitting elements.

[0069] [Fourth embodiment]

[0070] Hereinafter, a light emitting device 10c according to a fourth embodiment of the present invention will be described with reference to the drawings. Fig.11 It is a perspective view of the first principal surface side unit 7 a and the second principal surface side unit 7 b according to the fourth embodiment. Fig.12 It is a perspective view of a light emitting device 10c according to the fourth embodiment. In the light emitting device 10c according to the second embodiment, only the parts that are different from the light emitting device 10 according to the first embodiment will be described, and the rest will be omitted.

[0071] The light emitting device 10c is different from the light emitting device 10 in that it further includes a connecting portion 6 for connecting two or more light guides 4. More specifically, the material of the connecting portion 6 includes, for example, silicone rubber. Fig.12 As shown in FIG. 1 , the connecting portion 6 has a shape extending in the X-axis direction. Thus, the connecting portion 6 connects and holds the five light guides 4. Fig.12 As shown, five light guides 4 and the connecting portion 6 form a unit 7 .

[0072] The light emitting device 10c includes five light emitting elements 2 (not shown) and five light guides 4. Five through holes 3 (not shown) are provided in the substrate 1. In the present embodiment, the five light emitting elements 2 are respectively provided corresponding to the five through holes 3 and the five light guides 4. More specifically, in the present embodiment, five sets of a light emitting element 2, a through hole 3, and a light guide 4 arranged along the X-axis direction are arranged along the X-axis direction.

[0073] like Fig.11 As shown in FIG. 1 , the connecting portion 6 includes a first main surface side connecting portion 6a and a second main surface side connecting portion 6b. The first main surface side connecting portion 6a and the second main surface side connecting portion 6b have the same structure. Fig.11 As shown, the five light guides 4 include five first principal surface side light guides 4a and five second principal surface side light guides 4b. The first principal surface side light guides 4a and the five second principal surface side light guides 4b have the same structure.

[0074] The first main surface side connecting portion 6a has a shape extending in the X-axis direction. Thus, the first main surface side connecting portion 6a connects and holds the five first main surface side light guides 4a. As a result, Fig.11 As shown, the first main surface side connecting portion 6a and the five first main surface side light guides 4a form the first main surface side unit 7a. The first main surface side unit 7a is formed in one piece. In addition, the second main surface side connecting portion 6b has a shape extending in the X-axis direction. Thus, the second main surface side connecting portion 6b connects the five second main surface side light guides 4b and holds them. As a result, the second main surface side connecting portion 6b and the five second main surface side light guides 4b form the second main surface side unit 7b. The second main surface side unit 7b is formed in one piece.

[0075] like Fig.11 As shown in FIG. 1 , the unit 7 includes a first main surface side unit 7a and a second main surface side unit 7b. The first main surface side unit 7a and the second main surface side unit 7b have the same structure.

[0076] The first main surface side unit 7a and the second main surface side unit 7b are engaged with each other. Fig.11 and Fig.12As shown, when viewed in the normal direction of the first principal surface S1, the five first principal surface side light guides 4a and the five second principal surface side light guides 4b overlap, and the first principal surface side unit 7a is moved toward the substrate 1 and the second principal surface side unit 7b is moved in the Z-direction, thereby forming unit 7.

[0077] like Fig.11 and Fig.12 As shown, when viewed in the normal direction of the first principal surface S1, the first principal surface side unit 7a, the substrate 1, and the second principal surface side unit 7b are arranged in sequence along the Z-direction, and in a state where the five first principal surface side light guides 4a overlap with the five second principal surface side light guides 4b and the first principal surface side connecting portion 6a overlaps with the substrate 1 and the second principal surface side connecting portion 6b, the first principal surface side unit 7a is moved toward the substrate 1 and the second principal surface side unit 7b in the Z-direction, thereby forming a light-emitting device 10c. The substrate 1 and the unit 7 are fixed by screws 8 to hold the light-emitting device 10c. At this time, the first principal surface side unit 7a is located closer to the Z+ direction than the first principal surface S1. In addition, the second principal surface side unit 7b is located closer to the Z-direction than the second principal surface S2.

[0078] In the light-emitting device 10c as described above, the same effect as that of the light-emitting device 10 is achieved. In addition, according to the light-emitting device 10c, it is easy to manufacture the light-emitting device 10c. In more detail, the connecting portion 6 connects the five light guides 4. The connecting portion 6 and the five light guides 4 are a unit 7. Therefore, compared with independently configuring each of the light guides 4, the light-emitting device 10c can be easily manufactured. In addition, the unit 7 has a first main surface side unit 7a and a second main surface side unit 7b. The first main surface side unit 7a is integrally formed. In addition, the second main surface side unit 7b is integrally formed. The first main surface side unit 7a and the second main surface side unit 7b have the same structure. Therefore, the mold for molding the first main surface side unit 7a and the second main surface side unit 7b can also be one type. As a result, according to the light-emitting device 10c, it is easy to manufacture the light-emitting device 10c.

[0079] [Fifth embodiment]

[0080] Hereinafter, a light emitting device 10d according to a fifth embodiment of the present invention will be described with reference to the drawings. Fig.13 It is a perspective view of a light emitting device 10d according to the fifth embodiment. In the light emitting device 10d according to the fifth embodiment, only the parts that are different from the light emitting device 10 according to the first embodiment will be described, and the rest will be omitted.

[0081] The light emitting device 10d is different from the light emitting device 10 in that the light guide 4 is one.

[0082] In this embodiment, if Fig.13As shown, the light guide 4 has a shape extending further in the X-axis direction than the light guide 4 of the light emitting device 10. As a result, when viewed in the normal direction of the first main surface S1, the light guide 4 overlaps with the three through holes 3. In addition, the three light emitting elements 2 are provided corresponding to the three through holes 3, respectively.

[0083] The light emitting device 10d described above also has the same effects as those of the light emitting device 10. Furthermore, according to the light emitting device 10b, the number of light guides 4 can be reduced.

[0084] [Sixth embodiment]

[0085] Hereinafter, a light emitting device 10e according to a sixth embodiment of the present invention will be described with reference to the drawings. Fig.14 : is a perspective view of a light emitting device 10e according to the sixth embodiment. Fig.14 In the figure, only representative ones of the three light emitting elements 2 and the three through holes 3 are shown, and are denoted by reference numerals. Fig.15 It is a cross-sectional view taken along CC of a light emitting device 10 e according to the sixth embodiment. Fig.16 It is a cross-sectional view taken along the line DD of a light emitting device 10 e according to the sixth embodiment. Fig.17 (A) is a bottom view of the sensor 11 according to the sixth embodiment in a flat unfolded state. Fig.17 (B) is a cross-sectional view taken at EE of the sensor 11 according to the sixth embodiment in a flat developed state. In the light emitting device 10e according to the sixth embodiment, only the parts different from the light emitting device 10d according to the fifth embodiment will be described, and the rest will be omitted.

[0086] The light emitting device 10 e is different from the light emitting device 10 d in that the light guide 4 is in the shape of a quadrangular cylinder and that grips 9R and 9L and a sensor 11 are provided.

[0087] like Fig.15 and Fig.16 As shown, the inner side surface S15 and the outer side surface S16 of the light guide 4 each include a quadrilateral plane. In addition, the shape of the light guide 4 may also be a polygonal tube such as a pentagonal tube or a hexagonal tube.

[0088] The substrate 1 is mounted on the plane of the inner side surface S15 of the light guide 4. Fig.15As shown, the inner side surface S15 of the light guide 4 includes an end surface in the Z+ direction, an end surface in the Y+ direction, an end surface in the Z- direction, and an end surface in the Y- direction. The end surface in the Z+ direction of the inner side surface S15 of the light guide 4, the end surface in the Y+ direction of the inner side surface S15 of the light guide 4, the end surface in the Z- direction of the inner side surface S15 of the light guide 4, and the end surface in the Y- direction of the inner side surface S15 of the light guide 4 are all planes. That is, the inner side surface S15 of the light guide 4 includes a plane. In this embodiment, as Fig.15 As shown, the substrate 1 is mounted on the end surface of the inner side surface S15 of the light guide 4 in the Z-direction. Alternatively, the substrate 1 may be mounted on a plane other than the end surface of the inner side surface S15 of the light guide 4 in the Z-direction.

[0089] The user holds the grips 9R and 9L. More specifically, the grip 9R is attached to the end of the light guide 4 in the X+ direction. The grip 9L is attached to the end of the light guide 4 in the X- direction. In addition, the grip 9R has a symmetrical structure with the grip 9L. Therefore, the following description focuses on the grip 9L, and the description of the grip 9R is omitted. The material of each of the grips 9R and 9L is, for example, resin.

[0090] The handle 9L covers the outer side surface S16 of the light guide 4. Fig.14 and Fig.15 As shown, the grip 9L is attached to the outer side surface S16 of the light guide 4 so as to cover the periphery of the end portion in the X-direction of the outer side surface S16 of the light guide 4. Thus, the user can twist the light guide 4 by gripping the grips 9R and 9L.

[0091] The sensor 11 detects the deformation of the light guide 4. The sensor 11 is mounted on the outer side surface S16 of the light guide 4. Fig.16 As shown, the outer side surface S16 of the light guide 4 includes an end surface in the Z+ direction of the outer side surface S16, an end surface in the Y+ direction of the outer side surface S16, an end surface in the Z- direction of the outer side surface S16, and an end surface in the Y- direction of the outer side surface S16. The end surface in the Z+ direction of the outer side surface S16, the end surface in the Y+ direction of the outer side surface S16, the end surface in the Z- direction of the outer side surface S16, and the end surface in the Y- direction of the outer side surface S16 are all planes. That is, the outer side surface S16 of the light guide 4 includes a plane. In this embodiment, as Fig.16 As shown, the sensor 11 is installed across the end surface of the outer side surface S16 in the Y+ direction, the end surface of the outer side surface S16 in the Z+ direction, and the end surface of the outer side surface S16 in the Y- direction. Fig.14 As shown in FIG. 1 , the sensor 11 is located at a position that does not overlap with the handle 9R and the handle 9L when viewed in the Z-axis direction. In addition, both ends of the sensor 11 are located near the corners of the outer side surface S16 of the light guide 4. Fig.16As shown, the first end of the sensor 11 is located near the corner formed by the end surface of the outer side surface S16 of the light guide 4 in the Y+ direction and the end surface of the outer side surface S16 of the light guide 4 in the Z- direction. In addition, the second end of the sensor 11 is located near the corner formed by the end surface of the outer side surface S16 of the light guide 4 in the Y- direction and the end surface of the outer side surface S16 of the light guide 4 in the Z- direction.

[0092] When the user grips the grip 9R and the grip 9L and twists the light guide 4, the sensor 11 twists together with the light guide 4. As a result, the sensor 11 outputs a detection signal corresponding to the twist amount of the light guide 4 caused by the user twisting the grip 9R and the grip 9L. Fig.17 (A) and Fig.17 (B) of the present invention will now describe the details of the sensor 11.

[0093] like Fig.17 (A) and Fig.17 As shown in (B), the sensor 11 includes a piezoelectric film 14, a first electrode 15a, a second electrode 15b, a substrate 16, and adhesive layers 18 and 20. In addition, when the sensor 11 is unfolded on a plane, as shown in FIG. Fig.17 As shown in (A), the sensor 11 has a rectangular shape when viewed in the Z-axis direction. The piezoelectric film 14 has a sheet shape. Fig.17 As shown in (B), the piezoelectric film 14 has a third main surface S17 and a fourth main surface S18 arranged along the Z-axis direction. The length of the piezoelectric film 14 in the X-axis direction is longer than the length of the piezoelectric film 14 in the Y-axis direction. That is, the piezoelectric film 14 has a long side direction extending along the X-axis direction. In the present embodiment, when observed in the Z-axis direction, the piezoelectric film 14 has a rectangular shape with long sides extending along the X-axis direction. The piezoelectric film 14 has high flexibility. In addition, the piezoelectric film 14 generates an electric charge corresponding to the deformation amount of the piezoelectric film 14. In the present embodiment, the piezoelectric film 14 is a PLA film. Below, the piezoelectric film 14 is described in more detail.

[0094] The piezoelectric film 14 has the following characteristics: the polarity of the charge generated when the piezoelectric film 14 is stretched in a direction of 45 degrees relative to the X-axis direction is opposite to the polarity of the charge generated when the piezoelectric film 14 is stretched in a direction of 45 degrees relative to the Y-axis direction. Specifically, the piezoelectric film 14 is a film formed by a chiral polymer. The chiral polymer is, for example, polylactic acid (PLA), in particular, L-type polylactic acid (PLLA). The main chain of PLLA composed of a chiral polymer has a helical structure. PLLA has piezoelectricity that orients the molecules by uniaxial stretching. The piezoelectric film 14 has a piezoelectric constant of d14. The uniaxial stretching direction (orientation direction) of the piezoelectric film 14 forms an angle of 0 degrees or 180 degrees relative to the X-axis direction. The 0 degrees or 180 degrees, for example, includes an angle of 0 degrees ± 10 degrees or 180 degrees ± 10 degrees. When the light guide 4 is twisted, the piezoelectric film 14 is stretched in a direction of 45 degrees relative to the X-axis direction and the Y-axis direction to generate a charge. The magnitude of the charge depends on the amount of twisting of the light guide 4. More precisely, the magnitude of the charge is proportional to the differential value of the twist amount of the light guide 4 .

[0095] The first electrode 15a is a signal electrode. A detection signal is output from the first electrode 15a. Fig.17 As shown in FIG. 1B , the first electrode 15 a is provided on the third principal surface S17 of the piezoelectric film 14 . The second electrode 15 b is a ground electrode. The second electrode 15 b is grounded. The second electrode 15 b is provided on the fourth principal surface S18 of the piezoelectric film 14 .

[0096] like Fig.17 As shown in (B), the substrate 16 is arranged closer to the Z+ direction than the first electrode 15a. The substrate 16 deforms together with the piezoelectric film 14 by holding the piezoelectric film 14, the first electrode 15a and the second electrode 15b. The substrate 16 has a sheet shape. The substrate 16 has a fifth principal surface S19 and a sixth principal surface S20. The length of the substrate 16 in the X-axis direction is longer than the length of the substrate 16 in the Y-axis direction. In the present embodiment, when viewed in the Z-axis direction, the substrate 16 has a rectangular shape having a long side extending in the X-axis direction. The long side of the substrate 16 is longer than the long side of the piezoelectric film 14, the long side of the first electrode 15a and the long side of the second electrode 15b. The short side of the substrate 16 is longer than the short side of the piezoelectric film 14, the short side of the first electrode 15a and the short side of the second electrode 15b. When viewed in the Z-axis direction, the piezoelectric film 14, the first electrode 15a, and the second electrode 15b are arranged in a region surrounded by the outer edge of the substrate 16. The material of the substrate 16 is, for example, polyurethane or PET. Alternatively, the substrate 16 may be formed of a flexible substrate or a printed wiring board.

[0097] The adhesive layer 18 fixes the piezoelectric film 14, the first electrode 15a, and the second electrode 15b to the substrate 16. In more detail, Fig.17As shown in (B), the adhesive layer 18 is provided on the sixth main surface S20 of the substrate 16. The adhesive layer 18 covers a portion of the sixth main surface S20 of the substrate 16. Fig.17 As shown in (B), the adhesive layer 18 covers the entire third main surface S17 of the first electrode 15a. When viewed in the Z-axis direction, the outer edge of the adhesive layer 18 is surrounded by the outer edge of the substrate 16. The adhesive layer 18 bonds the first electrode 15a to the substrate 16. As a result, the deformation of the substrate 16 is transmitted to the piezoelectric film 14. The material of the adhesive layer 18 is, for example, a double-sided tape, a thermosetting adhesive, or a thermoplastic adhesive.

[0098] like Fig.17 As shown in (B), the adhesive layer 20 is provided on the fifth main surface S19 of the substrate 16. The adhesive layer 20 fixes the substrate 16 to the outer surface S16 of the light guide 4. The material of the adhesive layer 20 is, for example, a double-sided tape, a thermosetting adhesive, or a thermoplastic adhesive.

[0099] According to the light emitting device 10e, the substrate 1 can be easily mounted on the light guide 4. More specifically, the inner side surface S15 of the light guide 4 includes a flat surface. The substrate 1 is mounted on the flat surface of the inner side surface S15 of the light guide 4. Therefore, the substrate 1 can be easily mounted on the inner side surface S15 of the light guide 4. As a result, according to the light emitting device 10e, the substrate 1 can be easily mounted on the light guide 4.

[0100] According to the light emitting device 10e, the sensor 11 for detecting the deformation of the light guide 4 can be easily mounted on the light guide 4. In more detail, the sensor 11 includes a piezoelectric film 14. The piezoelectric film 14 has high flexibility. In addition, the sensor 11 is mounted on the plane of the outer side surface S16 of the light guide 4. Therefore, the sensor 11 can be easily mounted on the outer side surface S16 of the light guide 4. As a result, according to the light emitting device 10e, the sensor 11 for detecting the deformation of the light guide 4 can be easily mounted on the light guide 4.

[0101] According to the light emitting device 10e, the grips 9R and 9L for the user to hold can be fixed to the light guide 4 more stably. In more detail, the outer side surface S16 of the light guide 4 includes a plane. In addition, the grips 9R and 9L each cover the outer side surface S16 of the light guide 4 from all sides. In the case where the outer side surface S16 of the light guide 4 is a curved surface, the direction of the torsional force (the force in the circumferential direction of the grips 9R and 9L) given by the user to the grips 9R and 9L is consistent with the circumferential direction of the outer side surface S16 of the light guide 4, and therefore, the torsional force is transmitted to the light guide 4 through the static friction force between the grips 9R and 9L and the outer side surface S16 of the light guide 4. In this case, if the torsional force given by the user to the grips 9R and 9L exceeds the static friction force, the grips 9R and 9L each rotate around the central axis direction (X-axis direction) of the light guide 4. In contrast, when the outer surface S16 of the light guide 4 includes a plane, the direction of the torsional force applied by the user to the handles 9R and 9L is a direction intersecting the plane. Therefore, when the outer surface S16 of the light guide 4 includes a plane, the user holds the handles 9R and 9L respectively and twists the light guide 4, thereby suppressing the rotation of the handles 9R and 9L relative to the light guide 4 around the central axis direction of the light guide 4 (X-axis direction). That is, the handles 9R and 9L can be fixed to the light guide 4 more firmly. As a result, according to the light emitting device 10e, even if it is assumed that no adhesive member is used, the handles 9R and 9L held by the user can be installed on the light guide 4, and the force of the user twisting the light guide 4 can be efficiently transmitted to the light guide 4.

[0102] [First Modification]

[0103] Hereinafter, a light emitting device 10f according to a first modified example of the present invention will be described with reference to the drawings. Fig.18 It is a cross-sectional view taken along CC of a light emitting device 10 f according to a first modification.

[0104] Fig.19 It is a cross-sectional view of the light emitting device 10f according to the first modification at the line DD. In addition, only the parts of the light emitting device 10f according to the first modification that are different from the light emitting device 10e according to the sixth embodiment will be described, and the rest will be omitted.

[0105] The light emitting device 10f is different from the light emitting device 10d in that the shape of the light guide 4 is a decagonal tube.

[0106] The shape of the light guide 4 is a decagonal tube, so the inner side surface S15 and the outer side surface S16 of the light guide 4 are respectively as follows: Fig.18 and Fig.19 Therefore, the inner side surface S15 and the outer side surface S16 of the light guide 4 each include a plane.

[0107] The light emitting device 10f described above also has the same effects as those of the light emitting device 10e.

[0108] [Second Modification]

[0109] Hereinafter, a light emitting device 10g according to a second modification of the present invention will be described with reference to the drawings. Fig. 20 It is a cross-sectional view taken along CC of a light emitting device 10g according to a second modification.

[0110] Fig.21 It is a cross-sectional view of the light emitting device 10g according to the second modification at the line DD. In addition, only the parts of the light emitting device 10g according to the second modification that are different from the light emitting device 10e according to the sixth embodiment will be described, and the rest will be omitted.

[0111] The light emitting device 10g is different from the light emitting device 10e in that the shape of the light guide 4 is different.

[0112] like Fig. 20 and Fig.21 As shown, the inner side surface S15 of the light guide 4 includes a flat surface. In this way, part of the inner side surface S15 of the light guide 4 may be a flat surface.

[0113] The light emitting device 10g described above also has the same effects as those of the light emitting device 10e.

[0114] [Seventh embodiment]

[0115] Hereinafter, a light emitting device 10h according to a seventh embodiment of the present invention will be described with reference to the drawings. Fig. 22 It is a plan view of the light emitting device 10h according to the seventh embodiment as viewed in the Z-direction. Fig.23 It is a cross-sectional view of the light emitting device 10h according to the seventh embodiment, taken along the line EE. Fig.24 It is a cross-sectional view taken along FF of a light emitting device 10h according to the seventh embodiment. Fig.25 This is an example of the reflected light L4 and the emitted light L2 in the light emitting device 10h according to the seventh embodiment. Fig.26 This is an example of reflected light L4 and emitted light L2 in the light emitting device 10h according to the seventh embodiment. In the light emitting device 10h according to the seventh embodiment, only the parts different from the light emitting device 10 according to the first embodiment will be described, and the rest will be omitted.

[0116] The light emitting device 10h differs from the light emitting device 10 in that no through hole 3 is provided on the substrate 1 , each of the plurality of light guides 4 includes a first principal surface side light guide 4a and a second principal surface side light guide 4b , and a connecting portion 6 connecting the plurality of light guides 4 is provided.

[0117] like Fig. 22 and Fig.23 As shown in FIG. 1 , the light emitting device 10h includes a substrate 1, five light emitting elements 2, five light guides 4, and a connecting portion 6. Fig.23 As shown, five light emitting elements 2 are respectively arranged corresponding to five light guides 4. In more detail, five sets of combinations including one light emitting element 2 and one light guide 4 are arranged along the X-axis direction. That is, five light emitting elements 2 are arranged along the X-axis direction. Five light guides 4 are arranged along the X-axis direction. In addition, the structures of the five sets of combinations including one light emitting element 2 and one light guide 4 are the same. Therefore, a combination including one light emitting element 2 and one light guide 4 will be described.

[0118] like Fig.24 As shown, the light emitting element 2 is located on the first main surface S1 of the substrate 1. The light emitting surface S3 of the light emitting element 2 faces the X+ direction.

[0119] like Fig.23 and Fig.24 As shown, the light guide 4 includes: a first main surface side light guide 4a located closer to the Z+ direction (first main surface side) than the first main surface S1; and a second main surface side light guide 4b located closer to the Z- direction (second main surface side) than the second main surface S2. Fig.24 As shown, the entire first principal surface side light guide 4a is located on the first principal surface side. In addition, the second principal surface side light guide 4b has both a portion located closer to the Z+ direction (first principal surface side) than the first principal surface S1 and a portion located closer to the Z- direction (second principal surface side) than the second principal surface S2.

[0120] like Fig.23 and Fig.24 As shown in FIG. 1 , when viewed in the normal direction of the first principal surface S1, the first principal surface side light guide 4a and the second principal surface side light guide 4b each overlap with the light emitting element 2. Fig.24As shown, the outer edges of the cross sections of the first principal surface side light guide 4a and the second principal surface side light guide 4b, which are perpendicular to the X-axis direction, have arc shapes. The first principal surface side light guide 4a has a first transmission surface S21a for incident light emitted by the light emitting element 2, and a first boundary surface S22a for reflecting the light L1 incident from the first transmission surface S21a as reflected light L4 and emitting it as emitted light L2. In addition, the second principal surface side light guide 4b has a second transmission surface S21b for incident light emitted by the light emitting element 2, and a second boundary surface S22b for reflecting the light L1 incident from the second transmission surface S21b as reflected light L4 and emitting it as emitted light L2. The first transmission surface S21a is the end surface of the first principal surface side light guide 4a in the Z-direction. The second transmission surface S21b is the end surface of the second principal surface side light guide 4b in the Z+direction. The first transmission surface S21a and the second transmission surface S21b are each a part of the incident surface S21. That is, the light guide 4 includes the incident surface S21 for the light emitted by the light emitting element 2 to be incident. In addition, the first boundary surface S22a is the outer side surface of the light guide 4a on the first main surface side. The second boundary surface S22b is the outer side surface of the light guide 4b on the second main surface side. The first boundary surface S22a and the second boundary surface S22b are each a part of the boundary surface S22. That is, the light guide 4 includes: a boundary surface S22 that reflects the light L1 incident from the incident surface S21 as reflected light L4 and emits it as emitted light L2. In addition, the incident surface S21, the first transmission surface S21a, and the second transmission surface S21b are, for example, mirror-finished. Therefore, the surface of each of the incident surface S21, the first transmission surface S21a, and the second transmission surface S21b is flat. In addition, the transmittance of each of the incident surface S21, the first transmission surface S21a, and the second transmission surface S21b is higher than the transmittance of the boundary surface S22. The boundary surface S22, the first boundary surface S22a, and the second boundary surface S22b are each roughened. Therefore, the surface roughness of each of the boundary surface S22, the first boundary surface S22a, and the second boundary surface S22b is greater than the surface roughness of each of the incident surface S21, the first transmission surface S21a, and the second transmission surface S21b. The material of each of the first main surface side light guide 4a and the second main surface side light guide 4b includes, for example, silicone rubber.

[0121] Furthermore, the first principal surface side light guide 4a and the second principal surface side light guide 4b are optically coupled via the first transmission surface S21a of the first principal surface side light guide 4a and the second transmission surface S21b of the second principal surface side light guide 4b. Fig.25 As shown in FIG. 1 , the first transmission surface S21a allows the light that travels inside the first main surface side light guide 4a and reaches the first transmission surface S21a to be emitted from the first transmission surface S21a to the outside of the first main surface side light guide 4a. The light emitted from the first transmission surface S21a reaches the second transmission surface S21b of the second main surface side light guide 4b and is incident on the second transmission surface S21b. Fig.26As shown, the second transmission surface S21b allows the light that travels inside the second main surface side light guide 4b and reaches the second transmission surface S21b to be emitted from the second transmission surface S21b to the outside of the second main surface side light guide 4b. The light emitted from the second transmission surface S21b reaches the first transmission surface S21a of the first main surface side light guide 4a and is incident on the first transmission surface S21a.

[0122] like Fig.24 As shown in FIG. 1 , the light emitting surface S3 of the light emitting element 2 and the second transmission surface S21b of the second principal surface side light guide 4b are arranged on the straight line L. More specifically, the light emitting surface S3 of the light emitting element 2 and the second transmission surface S21b of the second principal surface side light guide 4b are arranged at intervals on the straight line L. However, on the straight line L, there is no member such as the substrate 1 and the first principal surface side light guide 4a between the light emitting surface S3 of the light emitting element 2 and the second transmission surface S21b of the second principal surface side light guide 4b.

[0123] The boundary surface S22 emits the emission light L2 in both the Z+ direction (first main surface side) from the first main surface S1 and the Z- direction (second main surface side) from the second main surface S2. Fig.25 As shown, the light emitted by the light emitting element 2 is incident on the first transmission surface S21a. The light L1 incident on the first transmission surface S21a travels inside the first principal surface side light guide 4a. The first boundary surface S22a reflects the light that travels inside the first principal surface side light guide 4a and reaches the first boundary surface S22a as reflected light L4 toward the inside of the first principal surface side light guide 4a, and emits the light from the first boundary surface S22a to the outside of the light guide 4 as emitted light L2. At this time, the first boundary surface S22a mainly emits the emitted light L2 in the Z+ direction (first principal surface side) relative to the first principal surface S1. The reflected light L4 reflected to the inside of the first principal surface side light guide 4a travels inside the first principal surface side light guide 4a and is emitted from the first transmission surface S21a or the first boundary surface S22a to the outside of the first principal surface side light guide 4a or the light guide 4. The light emitted from the first transmission surface S21a is incident on the second transmission surface S21b of the second main surface side light guide 4b. The light L1 incident on the second transmission surface S21b travels inside the second main surface side light guide 4b. The second boundary surface S22b causes the light that travels inside the second main surface side light guide 4b and reaches the second boundary surface S22b to be reflected as reflected light L4 to the inside of the second main surface side light guide 4b, and to be emitted from the second boundary surface S22b to the outside of the second main surface side light guide 4b as emitted light L2. At this time, the second boundary surface S22b mainly emits the emitted light L2 in the Z-direction (second main surface side) closer to the second main surface S2. The reflected light L4 reflected to the inside of the second main surface side light guide 4b travels inside the second main surface side light guide 4b.

[0124] Or, for example, Fig.26As shown, the light emitted by the light emitting element 2 is directly incident on the second transmission surface S21b. The light L1 incident on the second transmission surface S21b travels inside the second main surface side light guide 4b. The second boundary surface S22b causes the light that travels inside the second main surface side light guide 4b and reaches the second boundary surface S22b to be reflected as reflected light L4 to the inside of the second main surface side light guide 4b, and to be emitted from the second boundary surface S22b to the outside of the light guide 4 as emitted light L2. At this time, the second boundary surface S22b mainly emits the emitted light L2 in the Z-direction (second main surface side) closer to the second main surface S2. The reflected light L4 reflected to the inside of the second main surface side light guide 4b travels inside the second main surface side light guide 4b and is emitted from the second transmission surface S21b or the second boundary surface S22b to the outside of the second main surface side light guide 4b or the light guide 4. The light emitted from the second transmission surface S21b is incident on the first transmission surface S21a of the first main surface side light guide 4a. The light L1 incident on the first transmission surface S21a travels inside the first main surface side light guide 4a. In this way, the light emitted by the light emitting element 2 is repeatedly reflected and emitted by the first boundary surface S22a and reflected and emitted by the second boundary surface S22b, and is emitted to both the first main surface side and the second main surface side as the emitted light L2.

[0125] like Fig. 22 As shown, the connecting portion 6 connects the five light guides 4. The connecting portion 6 has a shape extending in the X-axis direction. Thus, the connecting portion 6 connects and holds the five light guides 4. In addition, the material of the connecting portion 6 includes, for example, silicone rubber. In addition, the connecting portion 6 is made of the same material as the light guide 4. Thus, a part of the emission light L2 emitted from the light guide 4 is incident on the connecting portion 6. In addition, the light incident on the connecting portion 6 travels inside the connecting portion 6. That is, the connecting portion 6 has a light guide function that propagates the light incident on the connecting portion 6.

[0126] like Fig.23 As shown, the connecting portion 6 has a first main surface side connecting portion 6a and a second main surface side connecting portion 6b. The first main surface side connecting portion 6a has a shape extending in the X-axis direction. Thus, the first main surface side connecting portion 6a connects and holds the five first main surface side light guides 4a. In addition, the second main surface side connecting portion 6b has a shape extending in the X-axis direction. Thus, the second main surface side connecting portion 6b connects and holds the five second main surface side light guides 4b.

[0127] The first main surface side connecting portion 6a located at the ends of the light emitting device 10h in the X+ direction and the X- direction and the second main surface side connecting portion 6b located at the ends of the light emitting device 10h in the X+ direction and the X- direction are engaged with each other. Fig. 22 and Fig.23As shown in FIG. 1 , when viewed in the normal direction of the first principal surface S1 of the substrate 1, the five first principal surface side light guides 4a overlap with the five second principal surface side light guides 4b, the first principal surface side connecting portion 6a overlaps with the second principal surface side connecting portion 6b, and the first principal surface side connecting portion 6a, the substrate 1, and the second principal surface side connecting portion 6b are arranged in sequence along the Z-direction, and the five first principal surface side light guides 4a and the first principal surface side connecting portion 6a are moved toward the five second principal surface side light guides 4b and the second principal surface side connecting portion 6b along the Z-direction, thereby forming a light emitting device 10h. The substrate 1, the first principal surface side connecting portion 6a, and the second principal surface side connecting portion 6b are fixed by screws 8 to hold the light emitting device 10h.

[0128] In the light emitting device 10h as described above, the same effect as that of the light emitting device 10 is achieved. In addition, according to the light emitting device 10h, the brightness around the light guide 4 can be made uniform without increasing the number of light emitting elements. In more detail, the light emitting element 2 is located on the first main surface S1 of the substrate 1. The light guide 4 includes an incident surface S21 and a boundary surface S22 for incident light emitted by the light emitting element 2. Here, the boundary surface S22 is roughened. Therefore, the boundary surface S22 reflects a part of the light L1 incident from the incident surface S21 as reflected light L4, and emits a part of the light L1 incident from the incident surface S21 as emitted light L2. In addition, in Fig.25 and Fig.26 In each of the above descriptions, only the light emitted from the light emitting element 2 in two directions is described, but the direction of the light emitted from the light emitting element 2 is not limited to Fig.25 and Fig.26 Therefore, the emitted light L2 is emitted uniformly around the boundary surface S22. As a result, according to the light emitting device 10h, the brightness around the light guide 4 can be made uniform without increasing the number of light emitting elements.

[0129] In addition, the light guide 4 includes a first principal surface side light guide 4a located closer to the Z+ direction (first principal surface side) than the first principal surface S1, and a second principal surface side light guide 4b located closer to the Z- direction (second principal surface side) than the second principal surface S2. The first principal surface side light guide 4a and the second principal surface side light guide 4b are optically coupled via the first transmission surface S21a of the first principal surface side light guide 4a and the second transmission surface S21b of the second principal surface side light guide 4b. Thus, light emitted from the first transmission surface S21a of the first principal surface side light guide 4a is incident on the second transmission surface S21b. In addition, the second principal surface side light guide 4b has a portion located on the first principal surface side. Thus, the light emitting surface S3 of the light emitting element 2 and the second transmission surface S21b of the second principal surface side light guide 4b are arranged on the straight line L. However, on the straight line L, there are no components such as the substrate 1 and the first main surface side light guide 4a between the light emitting surface S3 of the light emitting element 2 and the second transparent surface S21b of the second main surface side light guide 4b. As a result, a portion of the light emitted by the light emitting element 2 is directly incident on the second transparent surface S21b. In addition, the second boundary surface S22b is roughened. Therefore, the emitted light L2 is uniformly emitted around the second boundary surface S22b. As a result, the brightness around the light guide 4 on the side where the light emitting element 2 does not exist (the second main surface side) can be made uniform. As a result, according to the light emitting device 10h, the brightness around the light guide 4 can be made uniform without increasing the number of light emitting elements.

[0130] [Third Modification]

[0131] Hereinafter, a light emitting device 10i according to a third modified example of the present invention will be described with reference to the drawings. Fig. 27 EE is a cross-sectional view of the light emitting device 10i according to the third modification. Fig. 27 In the figure, only the length L14a of the end surface of the Z- direction of each of the five first principal surface side light guides 4a, the length L24a of the end surface of the Z+ direction of each of the five first principal surface side light guides 4a, the length L14b of the end surface of the Z+ direction of each of the five second principal surface side light guides 4b, and the length L24b of the end surface of the Z- direction of each of the five second principal surface side light guides 4b are marked with reference marks. In addition, regarding the light emitting device 10i according to the third modification, only the parts that are different from the light emitting device 10h according to the seventh embodiment will be described, and the remaining parts will be omitted.

[0132] The light emitting device 10i is different from the light emitting device 10h in that the length of each of the five first principal surface side light guides 4a in the X-axis direction becomes shorter as it approaches the Z+ direction, and the length of each of the five second principal surface side light guides 4b in the X-axis direction becomes shorter as it approaches the Z- direction.

[0133] In more detail, Fig. 27 As shown, the length of each of the five first principal surface side light guides 4a in the X-axis direction becomes shorter as it approaches the Z+ direction. Therefore, the length L14a of each of the end surfaces in the Z+ direction of the five first principal surface side light guides 4a in the X-axis direction is shorter than the length L24a of each of the end surfaces in the Z- direction of the five first principal surface side light guides 4a in the X-axis direction. In addition, the length of each of the five second principal surface side light guides 4b in the X-axis direction becomes shorter as it approaches the Z- direction. Therefore, the length L14b of each of the end surfaces in the Z- direction of the five second principal surface side light guides 4b in the X-axis direction is shorter than the length L24b of each of the end surfaces in the Z+ direction of the five second principal surface side light guides 4b in the X-axis direction.

[0134] In the light-emitting device 10i as described above, the same effect as that of the light-emitting device 10h is achieved. In addition, according to the light-emitting device 10i, the brightness around the light guide 4 can be made more uniform without increasing the number of light-emitting elements. In more detail, the length of each of the five first main surface side light guides 4a in the X-axis direction becomes shorter as it approaches the Z+ direction. In addition, the length of each of the five second main surface side light guides 4b in the X-axis direction becomes shorter as it approaches the Z- direction. Therefore, even if the number of light-emitting elements is the same, the number of reflections of light on the boundary surface S22 of the light-emitting device 10h is greater than the number of reflections of light on the boundary surface S22 of the light-emitting device 10i. As a result, the light L1 incident from the incident surface S21 is uniformly reflected and emitted in the entire region of the boundary surface S22. Therefore, the emitted light L2 is emitted more uniformly around the boundary surface S22. As a result, according to the light-emitting device 10i, the brightness around the light guide 4 can be made more uniform without increasing the number of light-emitting elements.

[0135] In addition, according to the light emitting device 10i, it is easy to remove each of the first main surface side light guide 4a and the second main surface side light guide 4b from the mold. In more detail, each of the first main surface side light guide 4a and the second main surface side light guide 4b is manufactured, for example, by injection molding. Each of the first main surface side light guide 4a and the second main surface side light guide 4b is formed by filling the mold with the materials of the first main surface side light guide 4a and the second main surface side light guide 4b, respectively. The end surface of the first main surface side light guide 4a (the second main surface side light guide 4b) in the Z- direction (Z+ direction) is pulled from a position closer to the end surface of the first main surface side light guide 4a (the second main surface side light guide 4b) in the Z- direction (Z+ direction) than the end surface of the first main surface side light guide 4a (the second main surface side light guide 4b) in the Z- direction (Z+ direction), thereby removing the first main surface side light guide 4a (the second main surface side light guide 4b) from the mold. Since the length of the first main surface side light guide 4a (the second main surface side light guide 4b) in the X-axis direction becomes shorter as it approaches the Z+ direction (Z- direction), the friction force in the Z- direction (Z+ direction) between the first main surface side light guide 4a (the second main surface side light guide 4b) and the mold is smaller. Therefore, according to the light emitting device 10i, it is easy to remove the first main surface side light guide 4a and the second main surface side light guide 4b from the mold.

[0136] [Other embodiments]

[0137] The light emitting device according to the present invention is not limited to the light emitting devices 10 and 10a to 10i, and can be modified within the scope of the gist thereof. In addition, the structures of the light emitting devices 10 and 10a to 10i can be arbitrarily combined.

[0138] In addition, the X-axis direction, Y-axis direction, and Z-axis direction in this specification may not be consistent with the X-axis direction, Y-axis direction, and Z-axis direction when the light emitting device 10 is actually used.

[0139] In addition, the first main surface S1 may not be parallel to the second main surface S2.

[0140] Furthermore, the through hole 3 may not have a rectangular shape when viewed in the normal direction of the first main surface S1.

[0141] Alternatively, the light guide 4 may reflect the light L1 incident on the incident surface S4 toward the outside of the light guide 4 .

[0142] In addition, the light guide 4 may not have a portion located closer to the Z-direction than the second main surface S2 .

[0143] In addition, the material of the light guide 4 is not limited to silicone rubber. The material of the light guide 4 may also include a thermoplastic resin. Thermoplastic resins are, for example, PC (polycarbonate) and the like.

[0144] In addition, the shape of the light guide 4 is not limited to a cylinder, and the shape of the light guide 4 may be an elliptical cylinder or a square cylinder.

[0145] In addition, the inner diameter of the light guide 4 may be equal to the length of the short side of the substrate 1 , or may be longer than the length of the short side of the substrate 1 .

[0146] In addition, when viewed in the normal direction of the first main surface S1, the surfaces S6 and S7 may not overlap with the through hole 3. In addition, the light guide 4 may cause the light that travels inside the light guide 4 and reaches the surfaces S6 and S7 to be emitted from the surfaces S6 and S7 as the emitted light L2. In this case, the surfaces S6 and S7 may also be rough-processed.

[0147] In addition, the incident surface S4 and the emitting surface S5 do not need to be rough-processed.

[0148] Alternatively, the diffuser plate 5 may reflect light incident from the incident surface S8 toward the outside of the diffuser plate 5 .

[0149] In addition, the diffuser plate 5 may not have a portion located closer to the Z-direction than the second main surface S2 .

[0150] In addition, the diffuser plate 5 may not be transparent.

[0151] In addition, the diffuser plate 5 may not have a rectangular parallelepiped shape.

[0152] In addition, the material of the connection part 6 is not limited to silicone rubber. The material of the connection part 6 may also include a thermoplastic resin. Thermoplastic resins are, for example, PC (polycarbonate) and the like.

[0153] In addition, in the light emitting devices 10, 10a, 10b, the light emitting element 2, the through hole 3, and the light guide 4 are not limited to three, and may be one. In addition, the light emitting element 2, the through hole 3, and the light guide 4 may be multiple in addition to three. In this case, the light emitting element 2, the through hole 3, and the light guide 4 may be provided correspondingly to each other.

[0154] Furthermore, in the light emitting devices 10, 10a, 10c, 10d, 10e, 10f, 10g, 10h, and 10i, the light emitting element 2 may not be a side-viewing LED.

[0155] In addition, in the light emitting devices 10, 10a, 10c, 10d, 10e, 10f, 10g, 10h, and 10i, the normal direction of the light emitting surface S3 may not be parallel to the X-axis direction.

[0156] Furthermore, in the light emitting devices 10 , 10 a , 10 c , 10 d , 10 e , 10 f , and 10 g , the through hole 3 may overlap with the light emitting element 2 when viewed in the normal direction of the first main surface S1 .

[0157] In the light emitting devices 10, 10a, 10c, 10d, 10e, 10f, and 10g, the through holes 3 may not be in contact with the light emitting surface S3. The light emitting surface S3 and the through holes 3 may be arranged in sequence at intervals in the X+ direction.

[0158] In the light emitting device 10a, the number of the diffuser plates 5 is not limited to three, but may be one. In addition, the number of the diffuser plates 5 may be multiple. In this case, the diffuser plates 5 may be provided corresponding to the light emitting element 2, the through hole 3, and the light guide 4, respectively.

[0159] In the light emitting device 10b, the light emitting element 2 may not have a portion located closer to the Z+ direction than the first principal surface S1. In addition, the light emitting element 2 may not have a portion located closer to the Z- direction than the second principal surface S2.

[0160] In addition, in the light emitting device 10c, the screw 8 is not essential.

[0161] In the light emitting device 10c, the number of the light emitting elements 2, the through holes 3, and the light guides 4 is not limited to five, and may be a plurality other than five.

[0162] In the light emitting device 10d, the number of the light emitting element 2 and the through hole 3 is not limited to three, but may be one. In addition, the number of the light emitting element 2 and the through hole 3 may be more than three. In this case, the light emitting element 2 and the through hole 3 may be provided correspondingly to each other.

[0163] In addition, in the light emitting devices 10d, 10e, 10f, and 10g, the length of the light guide 4 in the X-axis direction may be equal to the length of the long side of the substrate 1. In addition, the length of the light guide 4 in the X-axis direction may be shorter than the length of the long side of the substrate 1, or longer than the length of the long side of the substrate 1.

[0164] The interior of the light guide 4 is a portion surrounded by the incident surface S4, the emission surface S5, and the surfaces S6 and S7. The interior of the diffuser plate 5 is a portion surrounded by the incident surface S8 and the emission surfaces S9, S10, S11, S12, and S13.

[0165] In addition, the piezoelectric film 14 may be a PVDF (polyvinylidene fluoride) film. In addition, the piezoelectric film 14 may be a piezoelectric ceramic. In addition, the piezoelectric film 14 may be a strain sensor.

[0166] Alternatively, the sensor 11 may be provided at a position overlapping the grip 9R or the grip 9L when viewed in the Z-axis direction. In this case, the sensor 11 may be provided between the grip 9R or the grip 9L and the light guide 4. In this case, the adhesive layer 20 is not necessarily required.

[0167] In addition, the sensor 11 may not have a longitudinal direction extending in the X-axis direction. The sensor 11 may have a longitudinal direction extending in the Y-axis direction.

[0168] In addition, the material of each of the grips 9R and 9L may not be resin.

[0169] In addition, the grips 9R and 9L may be attached to the ends of the light guide 4 via an adhesive member. In this case, the material of the adhesive member may be, for example, a double-sided tape, a thermosetting adhesive, or a thermoplastic adhesive.

[0170] In the light emitting devices 10h and 10i, the number of light emitting elements 2 and light guide 4 is not limited to five, but may be one. In addition, the number of light emitting elements 2 and light guide 4 may be more than five. In this case, the light emitting elements 2 and light guide 4 may be provided correspondingly to each other.

[0171] In the light emitting devices 10h and 10i, the entire first principal surface side light guide 4a may not be located on the first principal surface side. In this case, the first principal surface side light guide 4a may have both a portion located on the first principal surface side and a portion located on the second principal surface side.

[0172] Furthermore, in the light emitting devices 10h and 10i, the first principal-surface-side light guide 4a and the second principal-surface-side light guide 4b may be the same member.

[0173] In the light emitting devices 10h and 10i, the first transmission surface S21a of the first principal-surface-side light guide 4a and the second transmission surface S21b of the second principal-surface-side light guide 4b may or may not be in contact with each other.

[0174] Furthermore, the first transmission surface S21a may not be the end surface of the first principal surface side light guide 4a in the Z-direction. Furthermore, the second transmission surface S21b may not be the end surface of the second principal surface side light guide 4b in the Z+direction.

[0175] In addition, the surfaces of the first transmission surface S21 a and the second transmission surface S21 b may not be flat.

[0176] Furthermore, the connecting portion 6 may not be made of the same material as the light guide 4 .

[0177] In addition, in the light emitting devices 10h and 10i, the connecting portion 6 and the screw 8 are not essential.

[0178] In addition, the light emitting devices 10h and 10i may further include grips 9R and 9L for the user to hold. In this case, the grip 9R may be attached to the end of the connecting portion 6 in the X+ direction. In addition, the grip 9L may be attached to the end of the connecting portion 6 in the X- direction.

[0179] Furthermore, the light emitting devices 10 h and 10 i may further include a sensor 11 for detecting deformation of the light guide 4 .

[0180] Furthermore, in the light emitting device 10i, the lengths of all the first principal-surface-side light guides 4a in the X-axis direction among the five first principal-surface-side light guides 4a may not decrease toward the Z+ direction.

[0181] Furthermore, in the light emitting device 10i, the lengths of all the second principal-surface-side light guides 4b in the X-axis direction among the five second principal-surface-side light guides 4b may not decrease toward the Z-direction.

[0182] Description of Reference Numerals

[0183] 1...substrate; 2...light emitting element; 3...through hole; 4...light guide; 4a...light guide on the first main surface side; 4b...light guide on the second main surface side; 5...diffuser; 6...connecting portion; 6a...connecting portion on the first main surface side; 6b...connecting portion on the second main surface side; 7...unit; 7a...unit on the first main surface side; 7b...unit on the second main surface side; 8...screw; 10, 10a, 10b, 10c, 10d, 10e, 10f, 10g, 10h, 10i...light emitting device; 21a, 21b...wiring; L1...light; L2, L3...emitted light; L4...reflected light; S1...first main surface; S2...second main surface; S3...light emitting surface; S4, S8...incident surface; S5, S9, S10, S11, S12, S13...exit surface; S6, S7...surface; S14...external surface; S15...inner surface; S16...external surface; S17...third principal surface; S18...fourth principal surface; S19...fifth principal surface; S20...sixth principal surface; S21...incident surface; S21a...first transmission surface; S21b...second transmission surface; S22...boundary surface; S22a...first boundary surface; S22b...second boundary surface; 9R, 9L...handle; 11...sensor; 14...piezoelectric film; 15a...first electrode; 15b...second electrode; 16...substrate; 18, 20...adhesive layer.

Claims

1. A light emitting device, characterized in that: have: A substrate comprising a first main surface and a second main surface; a light emitting element located on the first main surface; and a light guide including an incident surface on which the light emitted by the light emitting element is incident and an emission surface from which the light incident from the incident surface is emitted as emission light, The substrate is provided with a through hole connecting the first main surface and the second main surface, When viewed in the normal direction of the first main surface, the light guide overlaps with the through hole. The emission surface emits the emission light toward both the first principal surface side and the second principal surface side.

2. The light emitting device according to claim 1, characterized in that: The light emitting element is a side-view type LED including a light emitting surface, and the light emitting surface emits light.

3. The light emitting device according to claim 1 or 2, characterized in that: A diffuser plate is further provided, the diffuser plate diffuses the light emitted by the light emitting element, When viewed in the normal direction of the first main surface, the diffuser overlaps with the through hole, and emits the light toward both the first main surface side and the second main surface side.

4. The light emitting device according to claim 1 or 2, characterized in that: The through hole has a rectangular shape when viewed in the normal direction of the first main surface.

5. The light emitting device according to claim 1 or 2, characterized in that: The light guide is in the shape of a cylinder. There are two or more through holes. The light emitting element is disposed corresponding to each of the two or more through holes. The axial direction of the cylinder is consistent with the direction in which the two or more through holes are arranged.

6. The light emitting device according to claim 1 or 2, characterized in that: There are two or more light guides, A connecting portion is provided, wherein the connecting portion connects two or more of the light guides, The connecting portion and the two or more light guides form a unit, The unit includes an integrally formed first main surface side unit and an integrally formed second main surface side unit.

7. The light emitting device according to claim 1 or 2, characterized in that: The light guide is one, There are two or more through holes. The light emitting element is disposed corresponding to each of the two or more through holes. When viewed in the normal direction of the first main surface, the light guide overlaps with two or more of the through holes.

8. The light emitting device according to claim 1 or 2, characterized in that: The inner side surface of the light guide comprises a plane, The substrate is mounted on the plane.

9. The light emitting device according to claim 1 or 2, characterized in that: A sensor is further provided, the sensor detecting deformation of the light guide, The sensor is installed on the outer side of the light guide.

10. The light emitting device according to claim 9, characterized in that: It also has a handle for the user to hold. The outer side surface comprises a plane, The handle covers the outer side surface from all sides.

11. A light emitting device, characterized in that: have: A substrate comprising a first main surface and a second main surface; a light emitting element which is a lead frame type LED; and a light guide including an incident surface on which the light emitted by the light emitting element is incident and an emission surface from which the light incident from the incident surface is emitted as emission light, The substrate is provided with a through hole connecting the first main surface and the second main surface, When viewed in the normal direction of the first main surface, the light guide overlaps with the through hole. When viewed in the normal direction of the first main surface, the light emitting element is arranged at a position overlapping with the through hole, The emission surface emits the emission light toward both the first principal surface side and the second principal surface side.

12. The light emitting device according to claim 11, characterized in that: The through hole has a rectangular shape when viewed in the normal direction of the first main surface.

13. The light emitting device according to claim 11 or 12, characterized in that: The light guide is in the shape of a cylinder. There are two or more through holes. The light emitting element is disposed corresponding to each of the two or more through holes. The axial direction of the cylinder is consistent with the direction in which the two or more through holes are arranged.

14. The light emitting device according to claim 11 or 12, characterized in that: There are two or more light guides, A connecting portion is provided, wherein the connecting portion connects two or more of the light guides, The connecting portion and the two or more light guides form a unit, The unit includes an integrally formed first main surface side unit and an integrally formed second main surface side unit.

15. The light emitting device according to claim 11 or 12, characterized in that: The light guide is one, There are two or more through holes. The light emitting element is disposed corresponding to each of the two or more through holes. When viewed in the normal direction of the first main surface, the light guide overlaps with two or more of the through holes.

16. The light emitting device according to claim 11 or 12, characterized in that: The inner side surface of the light guide comprises a plane, The substrate is mounted on the plane.

17. The light emitting device according to claim 11 or 12, characterized in that: A sensor is further provided, the sensor detecting deformation of the light guide, The sensor is installed on the outer side of the light guide.

18. The light emitting device according to claim 17, characterized in that: It also has a handle for the user to hold. The outer side surface comprises a plane, The handle covers the outer side surface from all sides.

19. A light emitting device, characterized in that: have: A substrate comprising the first main surface and the second main surface arranged along a normal direction of the first main surface; a light emitting element located on the first main surface; and one or more light guides including an incident surface on which the light emitted by the light emitting element is incident and a boundary surface which reflects the light incident from the incident surface as reflected light and emits it as emitted light, The boundary surface emits the light toward both the first main surface side and the second main surface side.

20. The light emitting device according to claim 19, characterized in that: The light guide includes a first main surface side light guide located on the first main surface side and a second main surface side light guide located on the second main surface side. The first main surface side light guide has a first transmission surface. The second main surface side light guide has a second transmission surface. The first principal surface side light guide and the second principal surface side light guide are optically coupled via the first transmission surface and the second transmission surface. The second principal surface side light guide has a portion located on the first principal surface side.

21. The light emitting device according to claim 19 or 20, characterized in that: The surface roughness of the boundary surface is greater than the surface roughness of the incident surface.

22. The light emitting device according to claim 20, characterized in that: The surface roughness of the boundary surface is greater than the surface roughness of each of the first transmission surface and the second transmission surface.

Images