Vehicle lighting system

Abstract

To provide a vehicular lamp body device capable of enlarging a direction of emission light emitted to the outside by the outside in a vehicle width direction.SOLUTION: A vehicular light body device includes a light source and a light guide member 11. The light guide member includes an incidence part, an emission wall 18, an intermediate light guide wall 19, a first reflection surface, a second reflection surface 21, and a third reflection surface 22. The emission wall extends toward a vehicle front-back direction, and one end side in the extension direction is an emission surface. The intermediate light guide wall guides the light made incident on the incidence part to the other end side of the emission wall. The first reflection surface is disposed in an incidence region of the intermediate light guide wall, and internally reflects the light made incident on the incidence part as first parallel light. The second reflection surface is disposed in an incidence region on the other end side of the emission wall, and internally reflects the first parallel light as second parallel light. The third reflection surface is disposed in a region opposed to the second reflection surface on the other end side of the emission wall, and reflects part of the second parallel light as lateral transmitted light Ls transmitted through a lateral surface 18so of the emission wall.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a vehicle lamp body device.

Background Art

[0002] As a vehicle lamp body device such as a blinker lamp or a brake lamp, there is known one that guides light emitted from a light source such as an LED to an emission surface as parallel light directed in the vehicle front-rear direction through a light guide member (see, for example, Patent Document 1).

[0003] The vehicle lamp body device described in Patent Document 1 includes a light source and a light guide member, and an emission surface of the light guide member directed in the vehicle front-rear direction is formed so as to substantially follow the contour portion of the lamp body device. The light guide member includes an incident portion into which light is incident from the light source, an emission wall that extends along the vehicle front-rear direction and has a tip side in the extension direction as an emission surface, and an intermediate light guide wall that guides the light incident on the incident portion to the base end side of the emission wall. A first reflection surface for internally reflecting the light incident on the incident portion as first parallel light directed toward the base end side of the emission wall is provided in the incident region of the intermediate light guide wall. Further, a second reflection surface for internally reflecting the first parallel light guided by the intermediate light guide wall as second parallel light directed toward the tip side of the emission wall is provided on the base end side of the emission wall. In addition, an uneven diffusion portion for diffusing the light emitted to the outside in multiple directions is provided on the emission surface of the light guide member.

[0004] This vehicle lamp body device can emit the light emitted from the light source to the outside from the emission surface as parallel light substantially following the contour portion by internal reflection by the first reflection surface and the second reflection surface of the light guide member. In the case of this vehicle lamp body device, since parallel light along the vehicle front-rear direction is emitted from the emission surface, it will be visually recognized as bright linear light substantially following the contour portion from the outside.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

[0006] The vehicle lighting device described in Patent Document 1 diffuses a second parallel light beam that passes through the emission wall along the vehicle's longitudinal direction in multiple directions using a diffuser on the emission surface. However, because the diffuser on the emission surface has a fine uneven shape, there are limitations to how much the direction of the light emitted from the emission surface can be spread outward in the vehicle width direction. Currently, in order to improve the visibility of the illuminated lights from the outside, it is desirable to further expand the direction of the emitted light emitted to the outside in the vehicle width direction.

[0007] Therefore, the present invention aims to provide a vehicle lighting device that can expand the direction of emitted light to the outside in the vehicle width direction. [Means for solving the problem]

[0008] To solve the above problems, the vehicle lighting device according to the present invention employs the following configuration. That is, the vehicle lighting device according to the present invention comprises a light source and a light guide member that guides light incident from the light source to an output surface as parallel light directed in the front-rear direction of the vehicle, wherein the light guide member comprises an incident portion into which light is incident from the light source, an output wall extending in the front-rear direction of the vehicle with one end in the extension direction being the output surface, an intermediate light guide wall that guides light incident on the incident portion to the other end of the output wall, a first reflective surface disposed in the incident region of the intermediate light guide wall and internally reflects light incident on the incident portion as first parallel light directed toward the other end of the output wall, a second reflective surface disposed in the incident region on the other end of the output wall and internally reflects the first parallel light as second parallel light directed toward one end of the output wall, and a third reflective surface disposed in a region on the other end of the output wall opposite to the second reflective surface and reflects a portion of the second parallel light as lateral transmitted light that passes through the side of the output wall facing outward in the vehicle width direction.

[0009] In the above configuration, when light is emitted from the light source, the light is input to the incident part of the light guide member. The light input to the incident part is guided as first parallel light through the intermediate light guide wall to the other end of the exit wall by internal reflection by the first reflecting surface. The light guided to the other end of the exit wall is guided as second parallel light through internal reflection by the second reflecting surface towards one end of the exit wall. At this time, a portion of the second parallel light is reflected by the third reflecting surface, and the remainder of the second parallel light is emitted to the outside from the exit surface at one end of the exit wall. The second parallel light reflected by the third reflecting surface passes through the outer side of the exit wall in the vehicle width direction and is emitted as laterally transmitted light directed further outward in the vehicle width direction.

[0010] The third reflective surface is preferably a total reflecting surface that totally reflects the second parallel light.

[0011] In this case, there is no need to attach a reflector to the back of the third reflective surface in the direction of light incidence, and the vehicle lighting device can be manufactured easily and at low cost.

[0012] The second and third reflective surfaces may be formed such that, when viewed from the front-rear direction of the vehicle, the inner region of the second reflective surface in the vehicle width direction overlaps with the third reflective surface.

[0013] In this case, it becomes possible to reliably reflect a portion of the second parallel light reflected by the second reflecting surface back toward the third reflecting surface.

[0014] It is desirable that the third reflective surface and the side surface of the output wall are formed such that the reflected light reflected by the third reflective surface is input to the side surface of the output wall at an incident angle that does not exceed the critical angle.

[0015] In this case, the reflected light from the third reflective surface is reliably transmitted through the side of the exit wall and emitted to the outside as laterally transmitted light. [Effects of the Invention]

[0016] In the lamp body device for a vehicle according to the present invention, a third reflecting surface is disposed in a region facing a second reflecting surface on the other end side of an exit wall of a light guide member, and a part of second parallel light traveling toward one end side of the exit wall is reflected by the third reflecting surface, so as to be emitted to the outside as side transmission light that transmits through the side surface of the exit wall. Therefore, when the lamp body device for a vehicle according to the present invention is adopted, the direction of emitted light emitted to the outside can be expanded more toward the outside in the vehicle width direction.

Brief Description of the Drawings

[0017] [Figure 1] Front view of the lamp body device for a vehicle according to an embodiment. [Figure 2] Front view of a part of the lamp body device for a vehicle according to an embodiment, with a break. [Figure 3] Cross-sectional view taken along line III-III of FIG. 1. [Figure 4] Enlarged view of part IV in FIG. 3. [Figure 5] Enlarged view of part V in FIG. 4. [Figure 6] Perspective view of the light guide member according to an embodiment.

Embodiments for Carrying Out the Invention

[0018] Hereinafter, embodiments of the present invention will be described based on the drawings. In appropriate places in the drawings, an arrow FR indicating the front of the vehicle, an arrow UP indicating the upper side of the vehicle, and an arrow LH indicating the left side of the vehicle are marked.

[0019] FIG. 1 is a front view of a blinker lamp 1 which is one form of a lamp body for a vehicle, and FIG. 2 is a front view showing a part of the blinker lamp 1 with a break. Further, FIG. 3 is a cross-sectional view taken along line III-III of FIG. 1 of the blinker lamp 1. The blinker lamp 1 shown in the drawings is a blinker lamp disposed on the front right side of a motorcycle. The blinker lamp 1 includes a lamp body unit 12 including a light emitting element 10 such as an LED which is a light source, and a light guide member 11 made of a transparent resin material such as an acrylic resin. The lamp body unit 12 is disposed inside a lamp housing 13.

[0020] The lamp housing 13 includes a base portion 13a attached to the vehicle body, and a unit accommodating portion 13b extending outward in the vehicle width direction from the base portion 13a. The unit accommodating portion 13b has an opening on the vehicle front side, and the lamp unit 12 is accommodated in the opening 13c. The opening 13c of the unit accommodating portion 13b is formed in a substantially polygonal shape that is long in the vehicle width direction (a substantially pentagonal shape formed by combining a triangular shape at the outer end portion in the vehicle width direction of a rectangular shape that extends long in the vehicle width direction) when viewed from the front. The front side of the opening 13c of the lamp housing 13 is blocked by an outer lens 14 attached to the front portion of the unit accommodating portion 13b.

[0021] As shown in FIG. 3, the outer lens 14 includes a substantially flat lens main wall 14a disposed on the front side of the opening 13c, and a peripheral wall 14b protruding rearward from the peripheral edge of the lens main wall 14a. The outer lens 14 is fixed to the lamp housing 13 by abutting the end surface of the peripheral wall 14b against the peripheral edge of the opening 13c of the lamp housing 13 and engaging it with unevenness or screwing it in this state. The outer lens 14 is formed of a transparent resin material that allows light to pass through.

[0022] The lamp unit 12 includes the above-described light emitting element 10, a substrate 15 on which the light emitting element 10 is mounted on the front surface, the above-described light guide member 11, and a shielding cover 16 that shields the light guide unnecessary region at the center on the front surface side of the light guide member 11.

[0023] The light guide member 11 includes an incident portion 17 into which light is incident from the light emitting element 10, an emission wall 18 disposed substantially along a part of the opening 13c of the unit accommodating portion 13b (the upper side 13cu, the inclined sides 13ci, 13cj, and the lower side 13cl), and an intermediate light guide wall 19 that guides the light incident on the incident portion 17 to the base side (the other end side) of the emission wall 18. The front end surface facing the vehicle front side of the emission wall 18 is an emission surface 50 that emits the light incident on the incident portion 17 from the light emitting element 10 to the vehicle front side. The emission surface 50 is provided with a diffusion portion 51 having a fine uneven shape for diffusing the light emitted to the vehicle front side in multiple directions.

[0024] The intermediate light guide wall 19 is slightly smaller than the opening 13c of the unit housing section 13b, and is formed in a front view shape similar to the opening 13c. The intermediate light guide wall 19 is an upright light guide wall whose front surface faces directly towards the front of the vehicle. The incident section 17 is located in the central region of the rear view of the intermediate light guide wall 19. The incident section 17 bulges out in a frustoconical shape from the rear surface of the intermediate light guide wall 19 toward the rear of the vehicle.

[0025] Furthermore, as shown in Figure 3, a contact seat 40 is provided on the rear surface of the intermediate light guide wall 19, which abuts against the front surface of the substrate 15. The substrate 15 is supported by support ribs 39 that protrude from the unit housing portion 13b of the lamp housing 13, and the contact seat 40 of the intermediate light guide wall 19 abuts against the front surface of the substrate 15 in this state. Also, a boss portion 41 is provided protruding from the unit housing portion 13b of the lamp housing 13, which penetrates the substrate 15 and the intermediate light guide wall 19. A screw hole (not shown) is formed on the end face of the boss portion 41. The shaft of a screw 42 that penetrates the shielding cover 16 from the front side is screwed into this screw hole. The light guide member 11 is fixed to the lamp housing 13 by the intermediate light guide wall 19 being pressed against the substrate 15 when the shielding cover 16 is tightened into the boss portion 41 by the screw 42.

[0026] The emission wall 18 rises (extends) from the periphery of the intermediate light guide wall 19 toward the front of the vehicle. The direction of upright movement (extension direction) of the emission wall 18 is perpendicular to the extension direction of the intermediate light guide wall 19. In this embodiment, the emission wall 18 rises (extends) from the periphery of the intermediate light guide wall 19 toward the front of the vehicle, excluding the inner edge in the vehicle width direction.

[0027] Furthermore, as shown in Figure 3, the tip region of the emission wall 18, which rises from the periphery of the intermediate light guide wall 19 toward the front of the vehicle, protrudes toward the front of the vehicle beyond the front end surface of the unit housing portion 13b of the lamp housing 13. In other words, a part of the outer side surface of the emission wall 18 faces the inner surface of the peripheral wall 14b of the outer lens 14, which is located toward the front of the vehicle beyond the unit housing portion 13b.

[0028] Figure 4 is an enlarged view of section IV in Figure 3, and Figure 5 is an enlarged view of section V in Figure 4. Figure 6 is a perspective view of the outer region of the light guide member 11 in the vehicle width direction, as seen from the front of the vehicle. The incident region of the intermediate light guide wall 19 (the region in front of the incident section 17) is provided with a first reflective surface 20 that internally reflects the light incident on the incident section 17 as first parallel light L1 directed toward the base side of the exit wall 18. The first reflective surface 20 is composed of a rotational surface that is substantially cone-shaped and recessed toward the rear side of the vehicle relative to the front surface of the intermediate light guide wall 19. The rotational surface constituting the first reflective surface 20 is a rotational surface centered on an axis o that passes through the respective centers (or vicinity of the respective centers) of the incident section 17 and the light-emitting element 10. The light incident on the incident section 17 from the light-emitting element 10 undergoes radial internal reflection (total internal reflection) on the substantially cone-shaped first reflective surface 20 and travels through the interior of the intermediate light guide wall 19 as first parallel light L1 toward the base side of the exit wall 18.

[0029] A second reflective surface 21 is provided in the incident region on the base end side of the exit wall 18 (the outer end region of the intermediate light guide wall 19) to internally reflect the first parallel light L1 that reaches the incident region as a second parallel light L2 directed toward the tip side of the exit wall 18 (towards the front of the vehicle). The second reflective surface 21 reflects the light (first parallel light L1) that has been uniformly internally reflected radially from the substantially conical first reflective surface 20 as the second parallel light L2 toward the front of the vehicle on the outer circumference side of the intermediate light guide wall 19. For this reason, the second reflective surface 21 is not a single continuous surface, but is composed of multiple prism surfaces along the outer edge of the intermediate light guide wall 19. Figures 3 to 5 show the portion of the second reflective surface 21 that is located furthest outward in the vehicle width direction among the multiple prism surfaces. Hereinafter, the second reflective surface 21 shown in Figures 3 to 5 may be referred to as the "second reflective surface 21 on the outer side in the vehicle width direction".

[0030] As shown in Figures 4 and 5, the second reflective surface 21 on the outside in the vehicle width direction extends at an angle of approximately 45° from near the rear end of the outer side surface 18so (side surface facing outward in the vehicle width direction) of the emission wall 18 toward the rear surface 19r of the intermediate light guide wall 19. The second reflective surface 21 on the outside in the vehicle width direction extends to an inward position in the vehicle width direction that exceeds the position of the inner side surface 18si (side surface facing inward in the vehicle width direction) of the emission wall 18. In other words, the rear end of the second reflective surface 21 on the outside in the vehicle width direction is offset inward in the vehicle width direction relative to the inner side surface 18si of the emission wall 18.

[0031] Furthermore, as shown in Figures 4 and 5, a third reflective surface 22 is provided in the region facing the second reflective surface 21 on the outer side in the vehicle width direction at the base end of the emission wall 18, to reflect a portion of the second parallel light L2 reflected by the second reflective surface 21. The third reflective surface 22 is a total reflective surface that completely reflects the second parallel light L2 reflected by the second reflective surface 21. The front end of the third reflective surface 22 is connected to the inner side surface 18si of the emission wall 18, and the rear end is connected to the front surface 19f of the intermediate light guide wall 19. The second reflective surface 21 on the outer side in the vehicle width direction and the third reflective surface 22 inside it are formed such that, when viewed from the front of the vehicle, the inner region of the second reflective surface 21 in the vehicle width direction overlaps with the third reflective surface 22. In this embodiment, the third reflective surface 22 is provided only in the region facing the second reflective surface 21 that is located furthest outward in the vehicle width direction among the multiple divided second reflective surfaces 21. The third reflective surface 22 is not provided in the regions facing the second reflective surfaces 21 located in other regions. However, it is also possible to provide a similar third reflective surface 22 in the region facing the second reflective surface 21 that is adjacent to (or close to) the second reflective surface 21 located furthest outward in the vehicle width direction.

[0032] The third reflective surface 22 reflects a portion of the second parallel light L2 reflected by the second reflective surface 21 on the outside in the vehicle width direction as lateral transmitted light Ls that passes through the outer side surface 18so (side surface facing outward in the vehicle width direction) of the exit wall 18. The third reflective surface 22 is formed so that the reflected light Lsb reflected by the third reflective surface 22 is incident on the outer side surface 18so of the exit wall 18 in the vehicle width direction at an incident angle θ1 that does not exceed the critical angle (interface reflection angle). With this setting, the reflected light Lsb reflected by the third reflective surface 22 is refracted at a predetermined angle by the side surface 18so of the exit wall 18 and exits outward in the vehicle width direction. In Figure 5, the symbol θ2 represents the refraction angle when the reflected light Lsb passes through the side surface 18so of the exit wall 18 (the boundary between the resin layer of the exit wall 18 and the air layer outside of it), and the symbol Lsa represents the lateral transmitted light Ls after refraction at the side surface 18so. The exit direction of the lateral transmitted light Lsa(Ls) that has passed through the side surface 18so is set such that the lateral inclination angle α with respect to the vehicle's longitudinal direction is greater than or equal to a predetermined angle (for example, 80° or more).

[0033] The lateral inclination angle α described above is determined by the inclination and curvature of the surface of the third inclined surface 22. In this embodiment, the third inclined surface 22 is formed by a concave curved surface that is slightly recessed towards the rear of the vehicle. In other words, the surface of the third inclined surface 22 changes slightly in three dimensions, and the inclination angle of the surface also changes continuously. As a result, the lateral transmitted light Lsa (Ls) emitted after passing through the side surface 18so of the emission wall 18 travels outward in the vehicle width direction in a variety of directions. Therefore, this configuration expands the direction of light irradiation that can be seen from the outside with sufficient illumination.

[0034] Here, as described above, the light guide member 11's emission wall 18 protrudes forward at least in its tip-side region beyond the front surface of the unit housing portion 13b of the lamp housing 13. The peripheral wall 14b of the outer lens 14 is located to the side of the portion of the emission wall 18 that protrudes forward beyond the front surface of the unit housing portion 13b. Therefore, the lateral transmitted light Lsa (Ls) emitted from the outer side surface 18so of the emission wall 18 in the vehicle width direction passes through the peripheral wall 14b of the outer lens 14 and is emitted over a wide area on the outer side in the vehicle width direction.

[0035] Furthermore, the shielding cover 16 positioned in front of the central region of the light guide member 11 is provided with a reflective surface cover portion 16a that covers the front side of the diagonally inclined third reflective surface 22. As a result, the third reflective surface 22 is covered by the reflective surface cover portion 16a and becomes invisible from the front of the vehicle. A small gap (air layer) is maintained between the front surface of the third reflective surface 22 and the reflective surface cover portion 16a.

[0036] The turn signal lamp 1 with the above configuration can project light emitted from the light-emitting element 10 to the outside of the vehicle in the following manner. When light is emitted from the light-emitting element 10 on the substrate 15, the light is input to the incident portion 17 of the light guide member 11. The light input to the incident portion 17 is guided as first parallel light L1 towards the base end side of the exit wall 18 through internal reflection (total internal reflection) by the first reflective surface 20 of the light guide member 11 within the intermediate light guide wall 19. At this time, the first parallel light L1 is guided to the base end side of the entire area of ​​the exit wall 18 that extends substantially along the outer contour of the intermediate light guide wall 19. The light guided to the base end side of the exit wall 18 is guided as second parallel light L2 towards the front end side through internal reflection (total internal reflection) by the second reflective surface 21. At this time, for the second reflective surfaces 21 other than the second reflective surface 21 on the outside in the vehicle width direction, almost all of the second parallel light L2 reflected by the second reflective surface 21 is emitted towards the front of the vehicle from the exit surface 50 on the front end side of the exit wall 18. Light emitted from the emission surface 50 is diffused by the diffusion section 51 and emitted toward the front of the vehicle. The light emitted in this manner is mainly visible from the front of the vehicle through the main lens wall 14a of the outer lens 14. However, some of the light diffused through the diffusion section 51 is also emitted in the vertical and lateral directions through the peripheral wall 14b of the outer lens 14.

[0037] Furthermore, the second parallel light L2, which is created by reflection from the second reflective surface 21 on the outer side in the vehicle width direction of the light guide member 11, is partially reflected by the third reflective surface 22, and the remainder is emitted towards the front of the vehicle through the emission surface 50 on the tip side of the emission wall 18. The light passing through the emission surface 50 is emitted towards the front of the vehicle in the same manner as described above. On the other hand, the second parallel light L2 reflected from the third reflective surface 22 passes through the outer side surface 18so of the emission wall 18 in the vehicle width direction and is emitted as lateral transmitted light Ls, directed further outward in the vehicle width direction.

[0038] The turn signal lamp 1 of this embodiment includes a light guide member 11 comprising an incident portion 17 into which light is incident from a light-emitting element 10, an exit wall 18 whose tip surface is an exit surface 50, and an intermediate light guide wall 19 that guides the light incident on the incident portion 17 to the base end side of the exit wall 18. The incident region of the intermediate light guide wall 19 is provided with a first reflective surface 20 that internally reflects the light incident on the incident portion 17 as a first parallel light L1, and the incident region on the base end side of the exit wall 18 is provided with a second reflective surface 21 that internally reflects the first parallel light L1 as a second parallel light L2 directed toward the tip side of the exit wall 18. Furthermore, a third reflective surface 22 is provided in the region facing the second reflective surface 21 on the base end side of the exit wall 18 that reflects a portion of the second parallel light L2 as lateral transmitted light Ls that passes through the side surface 18so on the outer side in the vehicle width direction of the exit wall 18. Therefore, in the outer region of the turn signal lamp 1 in the vehicle width direction, a portion of the second parallel light L2 directed toward the tip side of the emission wall 18 is reflected by the third reflective surface 22 and emitted to the outside as laterally transmitted light Ls that passes through the outer side surface 18so of the emission wall 18. Therefore, when the turn signal lamp 1 of this embodiment is adopted, the direction of the emitted light emitted to the outside can be expanded further outward in the vehicle width direction.

[0039] Furthermore, in this embodiment, the turn signal lamp 1 has a third reflective surface 22 of the light guide member 11 that is a total reflective surface that totally reflects the second parallel light L2. Therefore, when this configuration is adopted, there is no need to attach a reflector to the back of the third reflective surface 22 in the direction of light incidence, and the turn signal lamp 1 can be manufactured easily and at low cost.

[0040] Furthermore, in the turn signal lamp 1 of this embodiment, the second reflective surface 21 and the third reflective surface 22 of the light guide member 11 are formed such that, when viewed from the front-rear direction of the vehicle, the inner region of the second reflective surface 21 in the vehicle width direction overlaps with the third reflective surface 22. Therefore, when this configuration is adopted, a portion of the second parallel light L2 reflected by the second reflective surface 21 within the light guide member 11 can be reliably reflected towards the third reflective surface 22.

[0041] Furthermore, in the turn signal lamp 1 of this embodiment, the third reflective surface 22 and the outer side surface 18so of the emission wall 18 are formed so that the reflected light reflected by the third reflective surface 22 is input to the outer side surface of the emission wall 18 at an incident angle that does not exceed the critical angle. Therefore, when this configuration is adopted, the reflected light reflected by the third reflective surface 22 is reliably transmitted through the outer side surface 18so of the emission wall 18 and emitted to the outside as lateral transmitted light Ls.

[0042] As described above, the turn signal lamp 1 (vehicle lighting device) of this embodiment can expand the visible range of the emitted light to the outside, thereby stabilizing the quality of the turn signal lamp 1 (vehicle lighting device) and contributing to Goal 7 of the United Nations Sustainable Development Goals (SDGs), "Ensure access to affordable, reliable, sustainable, and modern energy for all."

[0043] It should be noted that the present invention is not limited to the embodiments described above, and various design modifications are possible without departing from the spirit of the invention. For example, the above embodiments exemplify a turn signal lamp 1 located on the front right side of a motorcycle as a vehicle lighting device, but the vehicle lighting device is not limited to this. The vehicle lighting device may be a turn signal lamp located on the front left side of the vehicle or a turn signal lamp located at the rear of the vehicle. Furthermore, the vehicle lighting device is not limited to a turn signal lamp; it may be a brake lamp, a side marker lamp, or other type of lighting device that illuminates the front or rear of the vehicle.

[0044] Furthermore, in the above embodiment, the third reflective surface 22 of the light guide member 11 is configured as a total reflective surface that totally reflects the second parallel light. However, the configuration of the third reflective surface 22 is not limited to this. For example, a metallic reflector may be attached to the back side of the second reflective surface 21 in the direction of light incidence by vapor deposition or the like.

[0045] Furthermore, the vehicles to which the vehicle lighting device is applied are not limited to motorcycles; other types of vehicles such as three-wheeled and four-wheeled vehicles may also be used. In addition, the vehicle lighting device can be installed on vehicles that do not have an engine, motor, or other drive source.

[0046] Furthermore, the light source for the vehicle-mounted device is not limited to LEDs; any form other than LEDs is acceptable as long as it can direct light into the incident portion of the light guide member. In addition, the number of light sources is not limited to one; two or more light sources may be provided. [Explanation of Symbols]

[0047] 1... Turn signal lamp (vehicle light unit), 10... Light-emitting element (light source), 11... Light guide member, 12... Light unit, 13... Lamp housing, 13a... Base, 13b... Unit housing, 13c... Opening, 13cu... Top edge, 13ci, 13cj... Inclined edges, 13cl... Bottom edge, 14... Outer lens, 14a... Main lens wall, 14b... Peripheral wall, 15... Substrate, 16... Shielding cover, 16a... Reflective surface cover, 17... Incident part ,18...Emission wall, 18si...Inner side, 18so...Outer side, 19...Intermediate light guide wall, 19f...Front, 19r...Rear, 20...First reflective surface, 21...Second reflective surface, 22...Third reflective surface, 39...Support rib, 40...Contact seat, 41...Boss part, 42...Screw, 50...Emission surface, 51...Diffusion part, α...Lateral inclination angle, L1...First parallel light, L2...Second parallel light, Ls...Lateral transmitted light, θ1...Incident angle, θ2...Refraction angle, o...Axis

Claims

1. Light source and The system includes a light guide member that guides light incident from the light source to the emission surface as parallel light directed in the front-rear direction of the vehicle, The light guide member is An incident section into which light is incident from the aforementioned light source, An ejection wall extending in the longitudinal direction of the vehicle, with one end in the direction of extension serving as the ejection surface, An intermediate light guide wall guides the light incident on the incident portion to the other end of the exit wall, A first reflective surface is provided in the incident region of the intermediate light guide wall, which internally reflects the light incident on the incident portion as first parallel light directed toward the other end of the exit wall, A second reflecting surface is provided, which is located in the incident region on the other end side of the output wall and internally reflects the first parallel light as a second parallel light directed toward one end side of the output wall. A vehicle lighting device characterized by comprising: a third reflective surface positioned in the incident region on the other end side of the emission wall so as to face the second reflective surface, which reflects a portion of the second parallel light as laterally transmitted light that passes through the side of the emission wall facing outward in the vehicle width direction.

2. The vehicle lighting device according to claim 1, characterized in that the third reflective surface is a total reflective surface that totally reflects the second parallel light.

3. The vehicle lighting device according to claim 2, characterized in that the second reflective surface and the third reflective surface are formed such that, when viewed from the front-rear direction of the vehicle, the inner region of the second reflective surface in the vehicle width direction overlaps with the third reflective surface.

4. The vehicle lighting device according to claim 2 or 3, characterized in that the third reflective surface and the side surface of the emission wall are formed such that the reflected light reflected by the third reflective surface is input to the side surface of the emission wall at an incidence angle that does not exceed the critical angle.

Images