Resin-molded article

Abstract

To provide a resin-molded article which enables reduction of manufacturing costs.SOLUTION: In a resin-molded article (10), a light guide (20) into which light can enter, a light emitter (40) capable of emitting light using the light entering from the light guide (20), and a base material (50) that supports the light guide (20) and the light emitter (40) are integrally formed. An emitting surface (20a) of the light guide (20) and an incident surface (46) of the light emitter (40) are spaced apart from each other so as to face each other with an air layer (21) interposed therebetween.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a resin molded article having a light guide. [Background technology]

[0002] Among resin molded products, there are those equipped with a light guide that spreads light incident from a light source into a linear or planar shape and emits it. Prior art relating to a resin molded product equipped with a light guide is disclosed in Patent Document 1.

[0003] The light guide disclosed in Patent Document 1 is used in a vehicle lamp. The light guide of this vehicle lamp includes a rod-shaped portion into which light from a light source is incident, and a plate-shaped portion having an edge that is disposed along the rod-shaped portion. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-033044 Summary of the Invention [Problem to be solved by the invention]

[0005] If the rod-shaped portion and the plate-shaped portion were molded integrally from the same material, the boundary between the rod-shaped portion and the plate-shaped portion would be unclear, and light incident on the base end of the rod-shaped portion would have difficulty reaching the tip of the rod-shaped portion and would instead immediately enter the plate-shaped portion. This would make it difficult to make the plate-shaped portion emit light uniformly even in areas far from the light source. Patent Document 1 therefore discloses molding the rod-shaped portion and the plate-shaped portion using different resin materials, or including a light diffusing material in the material forming the plate-shaped portion. However, there is room for improvement in terms of manufacturing costs.

[0006] An object of the present invention is to provide a resin molded product that can be manufactured at reduced cost. [Means for solving the problem]

[0007] The present disclosure provides a light guide having an exit surface and allowing light to enter; a light-emitting body having an incident surface onto which light emitted from the exit surface of the light guide body can be incident, the light-emitting body being capable of emitting light by the light incident from the incident surface; a base material having a light guide side support portion that supports the light guide and a light emitter side support portion that supports the light emitter, the base material being integrally formed; The resin molded article is provided in which the light-emitting surface of the light guide and the light-incident surface of the light emitter are spaced apart and face each other with an air layer interposed therebetween. [Effects of the Invention]

[0008] The present invention can provide a resin molded product that can reduce manufacturing costs. [Brief explanation of the drawings]

[0009] [Figure 1] Fig. 1A is a diagram of a resin molded product according to an embodiment attached to an instrument panel of a vehicle, and Fig. 1B is a cross-sectional view taken along line 1B-1B of Fig. 1A. [Figure 2] FIG. 1B is a perspective view of the resin molded product of FIG. 1A. [Figure 3] FIG. 3 is an exploded perspective view of the resin molded product of FIG. 2. [Figure 4] FIG. 2 is a diagram of a resin molded product viewed from a direction opposite to the surface of the light-emitting body. [Figure 5] FIG. 10 is a diagram of the resin molded product as seen from the back side of the light-emitting body. [Figure 6] Fig. 6A is an enlarged view of the area surrounded by line 6A in Fig. 4. Fig. 6B is an enlarged view of the area surrounded by line 6B in Fig. 4. Fig. 6C is an enlarged view of the area surrounded by line 6C in Fig. 4. Fig. 6C is an enlarged view of the area surrounded by line 6C in Fig. 4. [Figure 7] FIG. 1B is an enlarged view of the area surrounded by the line 7 in FIG. 1B. DETAILED DESCRIPTION OF THE INVENTION

[0010] <Example> The embodiment will be described with reference to the accompanying drawings, in which Fr indicates front, Rr indicates rear, Le indicates left, Ri indicates right, Up indicates top, and Dn indicates bottom.

[0011] Please refer to Fig. 1. Hereinafter, an embodiment will be described in which a resin molded product according to the present disclosure is employed as a lamp 10 provided in an instrument panel In of a vehicle, for example.

[0012] 2 and 3, the lighting fixture 10 includes a first light guide 20 (light guide) and a second light guide 30 into which light from a light source (see arrow L) can be incident, a light emitter 40 that can emit light using the light incident from the first light guide 20 and the second light guide 30, a decoration layer 11 that is provided on a back surface 43 of the light emitter 40 and can decorate the light emitter 40, and a base material 50 that supports the light emitter 40, the first light guide 20, and the second light guide 30.

[0013] (Manufacturing method of the lamp 10) The lighting fixture 10 is a resin molded product formed by heating and melting plastic resin and injecting it into a mold. The first light guide 20, the second light guide 30, and the light emitter 40 are formed from the same resin material, but the materials for each can be selected appropriately, and different materials may also be used. A detailed description of the manufacturing method of the lighting fixture 10 will be omitted.

[0014] (Light emitter 40) The light emitter 40 is plate-shaped and has a substantially rectangular outer shape. The shape of the light emitter 40 can be changed as appropriate. A surface 41 of the light emitter 40 faces the interior of the vehicle and is visible to the vehicle occupants.

[0015] The side surface 45 of the light-emitting body 40 has a first long side surface 46 extending in its longitudinal direction (left-right direction), a second long side surface 47 located opposite the first long side surface 46, a first short side surface 48 extending in the short side direction (up-down direction) of the light-emitting body 40, and a second short side surface 49 located opposite the first short side surface 48.

[0016] The first long side surface 46 is linear and serves as an incident surface onto which light from the first light guide 20 can be incident. The second long side surface 47 is curved and serves as an incident surface onto which light from the second light guide 30 can be incident.

[0017] The distance between the first long side surface 46 and the second long side surface 47 gradually increases from the first short side surface 48 toward the second short side surface 49 (the opposite side from the side where light L from the light source is incident). That is, the second short side surface 49 is longer than the first short side surface 48.

[0018] (1st light guide 20) 4, the first light guide 20 is a linear member that extends along the first long side surface 46 of the light emitter 40, and has a rectangular cross section. Hereinafter, the side onto which light L from the light source is incident (right side) will be referred to as the base end, and the opposite side (left side) will be referred to as the tip end.

[0019] (First air layer 21) The emission surface 20a of the first light guide 20 is spaced apart from and faces a first long side surface 46 (incident surface) of the light emitter 40 via a first air layer 21. A portion of the first light guide 20 that forms the first air layer 21 is referred to as a first main body portion 22.

[0020] Furthermore, the first light guide 20 has a first tip portion 23 that protrudes from the tip of the first main body portion 22 beyond the second short side surface 49, and a first base portion 24 that protrudes from the base end of the first main body portion 22 beyond the first short side surface 48. In other words, the first light guide 20 is disposed so as to protrude from the first long side surface 46.

[0021] (Second light guide 30) The second light guide 30 is a gently curved member that follows the second long side surface 47 of the light emitter 40, and has a rectangular cross section.

[0022] (Second air layer 32) The exit surface 30a of the second light guide 30 is spaced apart from and faces the second long side surface 47 (incident surface) of the light emitter 40 via a second air layer 31. A portion of the second light guide 30 that forms the second air layer 31 is referred to as a second main body portion 32.

[0023] Furthermore, the second light guide 30 has a second tip end portion 33 that protrudes from the tip of the second main body portion 32 beyond the second short side surface 49, and a second base end portion 34 that protrudes from the base end of the second main body portion 32 beyond the first short side surface 48. In other words, the second light guide 30 is disposed so as to protrude from the second long side surface 47.

[0024] (Light emitter side support portion 51) 3 and 5, the base material 50 has a light-emitting body-side support portion 51 that supports the light-emitting body 40. The light-emitting body-side support portion 51 is, for example, a substantially rectangular frame-shaped portion formed along the periphery 44 on the back surface 43 side of the light-emitting body 40 (in the embodiment, the back surface of the decorative layer 11).

[0025] The light emitter side support portion 51 has a first long portion 52 extending along the first long side surface 46 of the light emitter 40, a second long portion 53 extending along the second long side surface 47 of the light emitter 40, a first short portion 54 extending along the first short side surface 48 of the light emitter 40, and a second short portion 55 extending along the second short side surface 49 of the light emitter 40. The first long portion 52 to the second short portion 55 each have ribs 52a to 55a.

[0026] (Decorative layer 11) See Fig. 3. The decorative layer 11 is, for example, a film, and can decorate the light-emitting body 40 when the light-emitting body 40 is transparent. The light-emitting body side support part 51 and the light-emitting body 40 sandwich the decorative layer 11. Note that the decorative layer 11 does not necessarily have to be provided.

[0027] (Light guide side support part 60, 70) 3 and 4 , the base material 50 has a first light guide side support portion 60 (light guide side support portion) that supports the first light guide 20. The first light guide side support portion 60 includes a first tip support portion 61 that supports the first tip end 23 of the first light guide 20, and a first base end support portion 62 that supports the first base end 24 of the first light guide 20.

[0028] The base material 50 has a second light guide side support portion 70 (light guide side support portion) that supports the second light guide 30. The second light guide side support portion 70 includes a second tip end support portion 71 that supports the second tip end 33 of the second light guide 30, and a second base end support portion 72 that supports the second base end 34 of the second light guide 30.

[0029] (Connection part 80) 4 and 5, the base material 50 has four connection portions 80 that connect the light guide side support portions 60, 70 and the light emitter side support portion 51, respectively.

[0030] 6A, the first tip support portion 61 and the upper end of the second short-side portion 55 (the end portion on the first light guide 20 side) are connected by a first tip connection portion 81. When viewed from the direction facing the surface 41 of the light emitter 40, the first tip connection portion 81 is positioned so as not to overlap the first air layer 21.

[0031] 6B, the first base end support portion 62 is connected to the upper end of the first short-side portion 54 (the end portion on the first light guide 20 side) by a first base end connecting portion 82. The first base end connecting portion 82 is located so as not to overlap the first air layer 21.

[0032] 6C, the second tip support portion 71 is connected to the lower end of the second short-side portion 55 (the end on the second light guide 30 side) by a second tip connection portion 83. The second tip connection portion 83 is positioned so as not to overlap the second air layer 31.

[0033] 6D, the first base end support portion 62 and the lower end of the first short portion 54 (the end on the second light guide 30 side) are connected by a second base end connecting portion 84. The second base end connecting portion 84 is located so as not to overlap the second air layer 31.

[0034] To summarize the above, it can be said that the first main body portion 22 constituting the first air layer 21 and the second main body portion 32 constituting the second air layer 31 are not supported by the base material 50.

[0035] (support member 90) 1A and 1B, the lamp 10 is attached to the instrument panel In via a support member 90 that supports the lamp 10. The support member 90 can also be considered an adapter for attaching the lamp 10 to the instrument panel In. The support member 90 is a frame-shaped member that surrounds the surface 41 of the light emitter 40 so that only the light emitter 40 is exposed, and covers the base material 50, the first light guide 20, and the second light guide 30. The lamp 10 may be attached directly to the instrument panel In without using the support member 90. In this case, the base material 50 is provided with an attachment portion for the instrument panel In, such as a boss, as appropriate.

[0036] (Step portion 42 of light emitter 40) Please refer to Figures 2 and 3. The periphery of the surface 41 of the light emitter 40 has a stepped portion 42 formed in a stepped shape. Please refer to Figure 7. The stepped portion 42 has a stepped portion bottom surface 42a facing in the same direction as the surface 41 of the light emitter 40, and a stepped portion side surface 42b facing in a direction approximately perpendicular to the bottom surface 42a.

[0037] An inner peripheral side surface 91 of the support member 90 surrounds the stepped portion side surface 42b (the support member 90 can also be said to be an enclosing member). An inner peripheral edge 92a of a back surface 92 of the support member 90 contacts the stepped portion bottom surface 42a. A surface 93 of the support member 90 is located on the same plane as the surface 41 of the light-emitting body 40.

[0038] (Effects of the Example) Please refer to Figures 2 and 3. The first lamp 10 (a resin molded product) is a first light guide 20 (light guide) into which light can be incident and which has an exit surface 20a; a light emitter (40) having an incident surface (first long side surface) onto which light emitted from the exit surface (20a) of the first light guide (20) can be incident, and capable of emitting light by light incident from the first long side surface (46); a base material 50 having first light guide side supports 60, 60 that support the first light guide 20 and a light emitter side support 51 that supports the light emitter 40, which are integrally formed; The exit surface 20a of the first light guide 20 and the incident surface (first long side surface 46) of the light emitting body 40 are spaced apart so as to face each other with a first air layer 21 interposed therebetween.

[0039] The boundary between the first light guide 20 and the light emitter 40 is clearly defined by the first air layer 21. Therefore, light is repeatedly reflected within the first light guide 20, allowing it to shine farther. The materials of the first light guide 20 and the light emitter 40 do not have to be different materials, but can be the same, and no light diffusing material is required. The first light guide 20 and the light emitter 40 are supported by a base material 50 that fixes them together. The first light guide 20 and the light emitter 40 can be supported with a simple structure. As described above, a lighting fixture 10 can be provided with reduced manufacturing costs.

[0040] In addition, if the base material 50 is provided with tabs or bosses, the lamp 10 can be easily attached to the instrument panel In.

[0041] It should be noted that there is no limitation on the shapes of the first light guide 20, the light emitter 40, and the base material 50. In addition, instead of the first light guide 20, a second light guide 30 may be employed.

[0042] Please refer to Figure 5. Second, in the first lighting fixture 10, The light emitter side support portion 51 is in the shape of a frame formed along the periphery 44 of the rear surface 43 of the light emitter 40 .

[0043] The weight of the lamp 10 can be reduced compared to when a plate-shaped illuminant support part 51 is provided that covers the entire back surface 43 of the illuminant 40. This allows light to pass through the inside of the illuminant 40, making it visible to passengers, and increases the degree of freedom in designing the decoration of the illuminant 40.

[0044] Please refer to Figures 6A to 6D. Third, in the first or second lighting fixture 10, The base material 50 has a connection portion 80 that connects the light guide side support portions 60 and 70 and the light emitter side support portion 51, When viewed from the direction facing the surface 41 of the light emitting body 40, the connection portion 80 is positioned so as not to overlap the air layer 21.

[0045] Light that enters the light-emitting surface (first long side surface 46) of the light-emitting body 40 from the light-emitting surface 20a of the first light guide 20 is less likely to be absorbed (attenuated) by the connection portion 80 of the base material 50, allowing more light to be incident on the light-emitting body 40 while shining over a long distance. The same applies to the second light guide 30.

[0046] Please refer to Figure 3. Fourth, in the first to third lighting fixtures 10, The first light guide 20 and the light emitter 40 are made of the same material. Compared to when the first light guide 20 and the light emitter 40 are molded from different materials, the manufacturing cost can be reduced.

[0047] Fifth, in the first to fourth lighting fixtures 10, A decoration layer 11 (film) capable of decorating the light emitting body 40 is provided on the back surface 43 of the light emitting body 40.

[0048] The decorative layer 11 makes it possible to decorate the luminous body 40 by adding colors or patterns. For example, if the luminous body 40 is transparent, the decorative layer 11 can prevent the inside from being seen.

[0049] Please refer to Figures 3 and 4. Sixth, in the fifth lighting fixture 10, The light-emitting body side support portion 51 is a frame-like member formed along the periphery 44 of the rear surface 43 of the light-emitting body 40. The light emitter side support portion 51 and the light emitter 40 sandwich the decorative layer 11 therebetween.

[0050] The decorative layer 11 can be supported by utilizing the support portion of the base material 50 for the light emitter 40 and the light emitter 40 .

[0051] Seventh, the first to sixth lighting fixtures 10 are In addition to the first light guide 20, a second light guide 30 is provided. The first light guide 20 and the second light guide 30 are arranged to sandwich the light emitter 40 therebetween.

[0052] That is, the second light guide 30 is disposed on the opposite side to the first light guide 20. Light is incident on the light emitting body 40 from both sides, and the brightness of the lighting fixture 10 (light emitting body 40) can be increased.

[0053] Eighth, in the seventh lighting fixture 10, The first light guide 20 and the second light guide 30 are arranged along the longitudinal direction (left-right direction) of the light emitter 40.

[0054] Compared to when the first light guide 20 and the second light guide 30 are arranged along the first short side surface 48 and the second short side surface 49 of the light emitter 40, the brightness of the light emitter 40 can be further increased.

[0055] 7. If the step portion 42 were not formed, an inner peripheral edge 92a of the back surface 92 of the support member 90 would overlap the surface 41 of the light emitter 40. Light emitted from the first light guide 20 would easily leak from the gap where the surface 41 and the edge 92a overlap.

[0056] In the embodiment, the edge of the surface 41 of the light emitter 40 has a stepped portion 42 formed in a stepped shape around the entire periphery. The inner side surface 91 of the support member 90 surrounds the stepped portion side surface 42b. The inner edge 92a of the back surface 92 of the support member 90 contacts the stepped portion bottom surface 42a. That is, to reach the vehicle interior, light emitted from the first light guide 20 must pass through the gap between the inner edge 92a and the stepped portion bottom surface 42a, as well as the gap between the side surface 91 and the stepped portion side surface 42b. Because the path the light takes to reach the vehicle interior is long and L-shaped, leakage of light emitted from the first light guide 20 can be suppressed. Furthermore, the surface 41 of the light emitter 40 can be made flush with the surface 93 of the support member 90, improving design.

[0057] In addition, if the support member 90 is not provided, the edge 97 of the hole in the instrument panel In may surround the side surface 42b of the step portion, the bottom surface 42a of the step portion may contact the back surface 98 of the instrument panel In, and the surface 41 of the light-emitting body 40 may be configured to be flush with the design surface 99 of the instrument panel In.

[0058] It should be noted that the present invention is not limited to the examples provided that the functions and effects of the present invention are achieved. Furthermore, the elements constituting the examples can be combined as appropriate. [Explanation of symbols]

[0059] 10…Lighting (resin molded product) 11...Decorative layer 20...first light guide (light guide), 20a...light exit surface of first light guide 21...First air layer 30…Second light guide 31... second air layer, 30a... second light guide body emission surface 40...Luminous object 41...Surface of luminous body 43...Back of the luminous body 44...Edge of the back of the luminous body 46...First long side surface (light-emitting body incident surface) 47...Second long side surface (light-emitting body incident surface) 50...Base material 51...Light-emitting body side support part 60...First light guide side support part 70…Second light guide side support part 80...Connection

Claims

1. a light guide body into which light can be incident and which has an exit surface; a light-emitting body having an incident surface onto which light emitted from the exit surface of the light guide body can be incident, the light-emitting body being capable of emitting light by the light incident from the incident surface; a base material having a light guide side support portion that supports the light guide and a light emitter side support portion that supports the light emitter, the base material being integrally formed; The resin molded product, wherein the light emitting surface of the light guide and the light incident surface of the light emitter are spaced apart so as to face each other with an air layer interposed therebetween.

2. The light-emitting body side support portion is a frame-like portion formed along the periphery of the rear surface of the light-emitting body. The resin molded product according to claim 1.

3. the base material has a connection portion that connects the light guide side support portion and the light emitter side support portion, the connection portion is positioned so as not to overlap the air layer when viewed from a direction facing the surface of the light-emitting body. The resin molded product according to claim 1.

4. The light guide and the light emitter are made of the same material. The resin molded product according to claim 1.

5. A decoration layer capable of decorating the light-emitting body is provided on the back surface of the light-emitting body. The resin molded product according to claim 1.

6. the light-emitting body side support portion is a frame-like portion formed along the periphery of the rear surface of the light-emitting body, The decorative layer is sandwiched between the light-emitting body side support portion and the light-emitting body. The resin molded product according to claim 5.

7. In addition to the light guide, a second light guide is provided, The light guide and the second light guide are arranged to sandwich the light emitter. The resin molded product according to any one of claims 1 to 6.

8. The light guide and the second light guide are arranged along the longitudinal direction of the light emitter. The resin molded product according to claim 7.

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