JP2015008111A - Composite lamp unit using linear light guide body, and vehicular lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite lamp unit that improves continuity of light emission by a linear light guide body at a boundary position between a first lamp unit (10) and a second lamp unit (20), and that has a one design sense of unity, and a vehicular lighting device.SOLUTION: A composite lamp unit (1), in which a first lamp unit (10) having a first transparent rod-like light guide body (11) and a second lamp unit (20) having a second transparent rod-like light guide body (21) are adjacent to each other, has a boundary part (35) at which respective ends are overlaid on each other in a forward and backward direction. At the boundary part (35), the first rod-like light guide body (11) and the second rod-like light guide body (21) form a thin portion. Thereby, a non-light emission part is eliminated at the boundary part, and therefore, a light emission face such as one continuous light guide rod can be obtained.

Description

  The present invention relates to a plurality of lamp units that irradiate light using a linear light guide, and more particularly to a vehicular lamp that forms a lamp unit in which a plurality of lamp units have a single unit in design.

  It is known that this type of linear light guide is used for vehicle lamps such as automotive headlamps and rear combination lamps. For example, Patent Document 1 describes one in which a linear light emitter including a translucent rod-shaped body of an automobile headlight is disposed, and one in which a linear light emitter is disposed in a side mirror, a backlight, and a high-mount stop lamp. Has been.

  FIG. 6 is a schematic cross-sectional view showing an example of the linear light emitter disclosed in Patent Document 1, and FIG. 7 shows an automobile backlight 90 in which three linear light emitters 91 including the translucent rod-like body 1 are arranged. The linear light emitter 91 described in Patent Document 1 is disposed so as to face a translucent rod-shaped body 92, a reflector 93 provided at one end in the longitudinal direction of the translucent rod-shaped body 92, and the other end. The LED light source 94 is disposed in the housing 95.

JP 2002-367403 A

  As a design requirement of a vehicular lamp, there is a case where it is desired to obtain a long linear light emission. As a specific measure for obtaining long linear light emission, for example, FIG. 8 may be considered as a single linear light emission connected using a plurality of linear light emitters. FIG. 8 is a schematic sectional view showing a case where three linear light emitters 91 of FIG. 7 are connected in the longitudinal direction. In this case, the LED light source 94 and the reflector 93 are provided at both ends of the translucent rod-shaped body 92, respectively, so that no light is emitted between the adjacent translucent light guides. Part 96.

  However, when the linear light emitters 91 in FIG. 8 are connected in the longitudinal direction, the non-light emitting portion 96 occupies a relatively large area, so that the design with a continuous feeling of connected linear light emission is obtained. It was a hindrance. In particular, since the length of the non-light emitting portion 96 in the longitudinal direction is larger than the length of the translucent rod-like body 92 in the short direction (width), the non-light emitting portion 96 is conspicuous.

The present invention has been made for the purpose of solving the above-mentioned problems, and the problem to be solved by the present invention is to enhance the continuity of a composite lamp unit using a linear light guide, and to design it. The object is to provide a composite lamp unit having a single unit.

The above-described problems are solved by the inventions of the claims.
The invention of claim 1 includes a first lamp unit having a translucent first rod-shaped light guide, and a first light source for entering light into the first rod-shaped light guide,
A second lamp unit having a light-transmitting second rod-shaped light guide and a second light source that makes light incident on the second rod-shaped light guide is a composite lamp unit provided adjacently,
The first rod-shaped light guide and the second rod-shaped light guide include a front side surface provided with an emission surface extending in a longitudinal direction, and a rear side surface located on the opposite side of the front side surface and having a reflection surface,
An end of the first rod-shaped light guide on the second rod-shaped light guide side is configured in a stepped shape in which a part of the front side surface is cut out in the front-rear direction of the rod-shaped light guide,
An end of the second rod-shaped light guide on the first rod-shaped light guide side is configured in a stepped shape in which a part of the rear side surface is notched in the front-rear direction of the rod-shaped light guide,
In the adjacent region of the first rod-shaped light guide and the second rod-shaped light guide, the stepped ends of the respective rod-shaped light guides are opposed to each other, and the step of the first rod-shaped light guide is provided. It is arranged so that the stepped shape of the second rod-shaped light guide is located in front of the shape,
The front side surface of the first rod-shaped light guide and the front side surface of the second rod-shaped light guide are designed so that the front side surfaces of the first rod-shaped light guide are coherent with each other. It is arranged to emit the light incident on the light guide,
The end portion of the first rod-shaped light guide having a stepped shape has a front side surface thinned in the front-rear direction as a thin-walled exit surface,
The stepped end of the second rod-shaped light guide has a thin portion incident on the rear side surface that is thin in the front-rear direction, and the light emitted from the thin portion exit surface of the first rod-shaped light guide is incident on it. A surface is provided, and both the light emitted from the first light source and the second light source are emitted from the front side surface facing the thin-walled incident surface,
The thin-walled portion entrance surface and the thin-walled portion exit surface are arranged in parallel.

According to the present invention, the light from the first light source incident on the first rod-shaped light guide in the first lamp unit reaches the end portion configured in the stepped shape on the second rod-shaped light guide. In the second lamp unit, the light from the second light source incident on the second rod-shaped light guide reaches the end portion configured in a stepped shape on the first rod-shaped light guide. At this end, the end of the second rod-shaped light guide is disposed in front of the end of the first rod-shaped light guide. For this reason, since any one of the rod-shaped light guides is arranged to emit light at the boundary position between the first lamp unit and the second lamp unit, the boundary position between the first lamp unit and the second lamp unit is observed. When viewed, the non-light emitting portion that existed when both lamp units were lit disappears.
Therefore, the continuity of the composite lamp unit is enhanced, and the composite lamp unit has a unity in design.

According to the invention of claim 2, the composite lamp unit of claim 1;
A lighting device capable of independently controlling lighting of the first light source and the second light source,
The first light source and the second light source are LEDs that emit the same emission color;
The lighting device is a vehicular lamp characterized in that the first light source and the second light source are turned on at the same time or only one of the light sources is turned on.

  According to the invention of claim 2, since the lighting device capable of independently controlling the lighting of the first light source and the second light source is provided, any of the rod-shaped light guides can emit light in the first lamp unit and the second lamp unit. Both rod-shaped light guides emit light. When both lamp units are lit, there is no non-light emitting portion at the boundary between both lamp units, and a vehicular lamp that is lit as one continuous line light source can be obtained. Further, when any one of the lamp units is lit, a vehicular lamp that is lit as a linear light source having a shorter length than that of a single continuous line light source in which both the lamp units are lit can be obtained.

  According to the present invention, the continuity of light emission by the linear light guide is enhanced at the boundary position between the first lamp unit and the second lamp unit, and a sense of unity with a single unit in design is improved.

Drawing 1 is a figure explaining arrangement of a compound lamp unit of an embodiment. FIG. 2 is a front view of the composite lamp unit according to the embodiment. 3 is a cross-sectional view taken along line BB in FIG. FIG. 4 is a diagram illustrating the arrangement of the composite lamp unit according to the second embodiment. FIG. 5 is a cross-sectional view of a main part of the vehicular lamp according to the third embodiment. FIG. 6 is a schematic cross-sectional view showing an example of a conventional linear light emitter. FIG. 7 shows a backlight of an automobile in which three conventional linear light emitters are arranged. FIG. 8 is a schematic front view showing a case where three conventional linear light emitters are connected in the longitudinal direction.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[Embodiment 1]
A rear lamp unit in which the composite lamp unit according to this embodiment is provided at the rear of the vehicle will be described as an example. FIG. 1A is a schematic perspective view showing the arrangement of the composite lamp unit of the embodiment, and FIG. 1B is a schematic front view showing the arrangement of the composite lamp unit in part A of FIG. As shown in FIG. 1, a rear lamp 41 provided on the rear side surface of the vehicle body, and a rear lamp 42 and a rear license lamp 43 provided on the tail gate on the rear surface of the vehicle body are provided side by side.

  In the following description, unless otherwise specified, descriptions in the vertical direction and the horizontal direction correspond to the descriptions in the drawings, and the vertical direction indicates the vertical direction of the vehicle. The front indicates the front in the main irradiation direction of the lamp unit, and the rear indicates the opposite side of the front. Accordingly, in the rear lamp that irradiates the rear side of the vehicle, the rear side of the vehicle is described as the front, and in the headlamp that irradiates the front side of the vehicle, the front side of the vehicle is described as the front.

  As shown in FIG. 1 (b), the first license unit 10 extending in the horizontal direction is fixed to the rear license lamp 43 provided at the tailgate on the rear surface of the vehicle body. A second lamp unit 20 extending in the horizontal direction, a tail and stop lamp 42a, and a stop lamp 42b are fixed to a rear lamp 42 provided on the tail gate on the rear surface of the vehicle body. A third lamp unit 30 extending in the horizontal direction and a turn lamp 41a are fixed to the rear lamp 41 provided on the rear side surface of the vehicle body. The first lamp unit 10, the second lamp unit 20, and the third lamp unit 30 are provided so as to be arranged in a line extending in a line.

  Each of the first lamp unit 10 and the second lamp unit 20 includes a rod-shaped light guide, and when both the lamp units are turned on, the composite lamp unit 1 having a single unit is designed. The third lamp unit 30 also has a sense of design uniformity using a rod-shaped light guide.

  The composite lamp unit 1 will be described with reference to FIGS. 2 is a front view of the composite lamp unit 1, and FIG. 3 is a cross-sectional view taken along the line BB of FIG. The composite lamp unit 1 includes a first lamp unit 10 and a second lamp unit 20. In the first embodiment, the first lamp unit 10 is fixed to the rear license lamp 43, and the second lamp unit 20 is fixed to the rear lamp 42, and is incorporated in a separate lamp.

  As shown in FIG. 3, the first lamp unit 10 includes a first rod-shaped light guide 11 and a first light source 12 that emits light toward the inside of the first rod-shaped light guide 11. The first lamp unit 10 is fixed in a housing 44 having a U-shaped cross section, and the opening of the housing 44 is sealed with an outer lens 45 so as to cover the first lamp unit 10. Reference numeral 49 is a screw for attaching to the vehicle.

  The 1st rod-shaped light guide 11 is shape | molded by translucent resin material, for example, an acryl, a polycarbonate, etc., and is made into the solid substantially cylindrical shape. An end surface of the first rod-shaped light guide 11 located on the side opposite to the second lamp unit 20 side is an incident surface 13 for taking light from the first light source 12 into the light guide. The shape of the incident surface 13 can be various shapes such as a concave shape, a convex shape, or a combination shape of a concave surface and a total reflection surface according to the emission intensity distribution of the first light source 12 that enters the incident surface 13. In FIG. 3, a plane is used for simplifying the drawing. The opposite end, that is, the end 18 on the second lamp unit 20 side will be described later.

  An emission surface 14 and a reflection surface 16 are formed on the side surface of the first rod-shaped light guide 11 that extends in the longitudinal direction. In FIGS. 2 and 3, the length in the longitudinal direction is shortened. The emission surface 14 is formed on the side surface in the emission direction of the light emitted from the first lamp unit 10, that is, the front side surface 15 located on the opposite side of the vehicle. The exit surface 14 may be provided with a prism cut for controlling the exit direction. The reflection surface 16 is formed on the side surface opposite to the emission direction of the light emitted from the first lamp unit 10, that is, the rear side surface 17 located on the vehicle side. The reflection surface 16 is a total reflection surface using a difference in refractive index between the first rod-shaped light guide 11 and air. As shown in FIGS. 2 and 3, the total reflection surface is formed with reflection grooves 16a having a fine pitch. The reflection groove 16a has, for example, a sawtooth shape in cross section, and an inclined surface having an angle capable of totally reflecting direct light from the first light source 12 through the incident surface 13 toward the reflection surface 16. A reflective film showing a high reflectance such as silver or aluminum may be provided instead of the reflecting surface utilizing the difference in refractive index. In addition, it is preferable to re-reflect light leaking backward from the reflecting surface 16 by covering the inner surface of the housing 44 with a reflecting surface having a high reflectance or by forming the housing 44 with a white resin having a high reflectance.

  The end 18 on the second lamp unit 20 side of the first rod-shaped light guide 11 will be described. In this embodiment, in order to improve the sense of unity between the boundary portion 35 of the first lamp unit 10 and the second lamp unit 20, the end portion 18 is arranged in the front-rear direction compared to the region other than the end portion of the light emitting portion 37. A thin shape with a thickness of less than half along (see FIG. 3). At the boundary between the thin-walled end portion 18 and the other thick light guide portion, a stepped shape with a sudden change in thickness is formed. This is because by forming the stepped shape, the second rod-shaped light guide 21 having the thin shape of the second lamp unit can be overlapped with the surface while maintaining continuity. Specifically, the thickness is halved from the front side surface 15 side.

  On the front side surface 15 of the end portion 18 of the first rod-shaped light guide 11, the light that has entered the first rod-shaped light guide 11 and travels in the same manner as the emission surface 14 of the other thick light guide portion. A thin portion emitting surface 19 formed so as to be able to emit light is provided. Further, the rear side surface 17 of the end portion 18 is provided with a reflection surface that reflects the light that has entered the first rod-shaped light guide 11 and has traveled in the same manner as the reflection surface 16 of the other thick light guide portion. It has been. In addition, the 1st rod-shaped light guide 11 and the 2nd rod-shaped light guide 12 so that the light radiate | emitted from the thin part exit surface 19 may radiate | emit toward the 2nd rod-shaped light guide 21 of the 2nd lamp unit 20 mentioned later. The relative positional relationship is arranged at a predetermined position.

  The first light source 12 uses an LED (light emitting diode). In the present embodiment, a surface-mounted LED is attached to a substrate (not shown), and the substrate is fixed to the housing 44. The light source is not limited to the LED and may be other than the surface mount type. The first light source 12 is connected to a lighting device (not shown) and is controlled to be lit independently.

  The second lamp unit 20 has the same configuration as the first lamp unit. That is, as shown in FIG. 3, it has the 2nd rod-shaped light guide 21 and the 2nd light source 22 which radiate | emits light toward the inside of the 2nd rod-shaped light guide 21. As shown in FIG. The second lamp unit 20 is disposed in the rear lamp 42 together with other tail and stop lamps 42a (see FIG. 1). The second lamp unit 20 is fixed in the housing 47, and the opening of the housing 47 is sealed with an outer lens 48 so as to cover a plurality of lamps provided in the housing 47 together with other tail and stop lamps 42 a and the like. Reference numeral 49 is a screw for attaching to the vehicle. In FIGS. 2 and 3, lamps other than the second lamp unit 20 are not shown.

  The 2nd rod-shaped light guide 21 is also shape | molded by the translucent resin material, for example, an acryl, a polycarbonate, etc., and is made into the solid substantially cylindrical shape. An end surface of the second rod-shaped light guide 21 located on the side opposite to the first lamp unit 10 side is an entrance surface 23 for taking light from the second light source 22 into the light guide. The shape of the incident surface 23 can be various shapes depending on the second light source 22 that enters the incident surface 23. The opposite end, that is, the end 28 on the first lamp unit 10 side will be described later.

  On the side surface extending in the longitudinal direction of the second rod-shaped light guide 21, an emission surface 24 and a reflection surface 26 are formed. The emission surface 24 is formed on the side surface in the emission direction of light emitted from the second lamp unit 20, that is, the front side surface 25 located on the opposite side to the vehicle. The exit surface 24 may be provided with a prism cut for controlling the exit direction. The reflection surface 26 is formed on the side surface opposite to the emission direction of the light emitted from the second lamp unit 20, that is, the rear side surface 27 located on the vehicle side. The reflection surface 26 is a total reflection surface using the difference in refractive index between the second rod-shaped light guide 21 and air. A reflective film showing a high reflectance such as silver or aluminum may be provided instead of the reflecting surface utilizing the difference in refractive index. In addition, it is preferable to re-reflect light leaking backward from the reflective surface 26 by covering the inner surface of the housing 47 with a reflective surface having a high reflectance or by forming the housing 47 with a white resin having a high reflectance.

  The end 28 on the first lamp unit 10 side of the second rod-shaped light guide 12 will be described. In order to improve the sense of unity between the first lamp unit 10 and the boundary portion 35 of the second lamp unit 20, in the present embodiment, the end portion 28 is arranged in the front-rear direction compared to the region other than the end portion of the light emitting portion 37. A thin shape with a thickness of less than half along (see FIG. 3). At the boundary between the thin-walled end portion 28 and the other light-guiding portion, a stepped shape with a sudden change in thickness is formed. Specifically, the thickness is halved from the rear side surface 27 side. By adopting the stepped shape, when the thin-walled end portion 18 of the first lamp unit and the thin-walled end portion 28 of the second lamp unit are overlapped with each other, they can be engaged with each other. Since the thin portions are engaged and overlapped, it is possible to prevent the entire thickness from increasing even if the rod-shaped light guides are stacked.

  The front side surface 25 of the end portion 28 of the second rod-shaped light guide 21 emits light that has entered the second rod-shaped light guide 21 and traveled in the same manner as other light guide portions. A surface 24 is formed. In addition, the rear side surface 26 of the end portion 28 reflects light that has entered the second rod-shaped light guide 21 and traveled in the same manner as the reflective surface 26 formed on the other thick light guide portions. A thin-walled reflecting surface 29 is provided.

  The thin portion reflecting surface 29 is formed in parallel at a position facing the thin portion emitting surface 19 of the first rod-shaped light guide 21 in the stepped portion having the stepped shape. The thin portion reflecting surface 29 also includes a light incident portion so that the light emitted from the thin portion emitting surface 19 enters the second rod-shaped light guide 21 from the thin portion reflecting surface 29. Therefore, the thin-walled reflection surface 29 functions as an incident reflection surface. For example, a reflective prism cut having a shape similar to that of the reflective surface 26 and parallel surfaces for functioning as a light incident portion are alternately formed.

  The second light source 22 uses an LED (light emitting diode). The LED is a monochromatic LED that emits the same color as the first light source 12, and specifically, both LEDs use red LEDs. The second light source 22 is also connected to a lighting device (not shown) and is controlled to be lit independently.

  Next, a case where the composite lamp unit according to the first embodiment is turned on will be described.

  The composite lamp unit is a rear lamp unit provided at the rear of the vehicle, and the first light source 12 and the second light source 22 are LEDs emitting red light. The first light source of the first lamp unit 10 is controlled to be lit in synchronization with the lighting of the stop lamp function of the tail and stop lamp 42a. The second light source of the second lamp unit 20 is controlled to turn on so that the tail lamp function of the tail and stop lamp 42a is turned on and the stop lamp function is turned on in synchronization.

  When the tail lamp is lit, the first lamp unit 10 does not emit light, and only the second lamp unit 20 emits red light. In this case, the position of the boundary line BL2 between the first lamp unit 10 and the second lamp unit 20 is the light / dark boundary position of the light emitting surface (see FIG. 3).

  When the stop lamp is lit, both the first lamp unit 10 and the second lamp unit 20 emit red light. In this case, the rod-shaped light guides 11 and 21 of either the first lamp unit 10 or the second lamp unit 20 at any position on the boundary lines BL1 and BL2 between the first lamp unit 10 and the second lamp unit 20. Emits red light. Therefore, the rod-shaped light guide 11 and the rod-shaped light guide 21 can obtain a continuous line-shaped light-emitting surface in which no non-light-emitting portion is present even at the boundary portion 35, and it has a unity in design and unity. It can be set as a certain vehicle lamp.

[Embodiment 2]
A vehicle lamp provided with a composite lamp unit according to the present embodiment in front of the vehicle will be described as an example. FIG. 4A is a schematic perspective view showing the arrangement of the composite lamp unit of the embodiment, and FIG. 4B is a schematic front view showing the arrangement of the composite lamp unit in part A of FIG. In the front of the vehicle, as shown in FIG. 4A, a front combination lamp 51 provided on the front side of the vehicle body and an accessory lamp 53 provided on the grill 52 at the front center of the vehicle body are provided side by side. In addition, about the component common to previous embodiment, after attaching the same code | symbol, detailed description is abbreviate | omitted.

  As shown in FIG. 4 (b), the first lamp unit 10 extending in the horizontal direction is fixed to the accessory lamp 53 provided on the grill at the center of the front of the vehicle body. The front combination lamp 51 is provided with a second lamp unit 20 extending in the horizontal direction, a head lamp 51b, and a turn lamp 51a. The first lamp unit 10, the second lamp unit 20, and the third lamp unit 30 are provided so as to be arranged in a line extending in a line.

  Each of the first lamp unit 10 and the second lamp unit 20 includes a rod-shaped light guide, and when both the lamp units are turned on, it becomes a composite lamp unit having a single unit in design.

  Since the first lamp unit 10 and the second lamp unit 20 have been described in detail in the first embodiment, only differences from the first embodiment will be described. In the second embodiment, the first light source 12 and the second light source 22 are LEDs that emit white light, and are connected to a lighting device (not shown) that can control lighting of each independently.

  Next, a case where the vehicular lamp according to the second embodiment is turned on will be described.

  When only the second light source 22 is turned on, the position of the boundary line BL2 shown in FIG. For example, lighting control is performed using the second lamp unit 20 as a position lamp. When both the first lamp unit 10 and the second lamp unit 20 are turned on, the first lamp unit 10 or the second lamp unit 20 is located at any position on the boundary lines BL1 and BL2 between the first lamp unit 10 and the second lamp unit 20. Any of the rod-shaped light guides 11 and 21 of the second lamp unit 20 emits white light. Therefore, the rod-shaped light guide 11 and the rod-shaped light guide 21 can obtain a continuous line-shaped light-emitting surface in which no non-light-emitting portion exists even at the boundary portion 35, and a sense of unity with a single unit in design. It becomes an improved vehicular lamp.

[Embodiment 3]
The composite lamp unit according to the present embodiment will be described by taking a vehicular lamp provided at the rear of the vehicle as in the first embodiment. FIG. 5 is a sectional view of the vehicular lamp according to the present embodiment. In the present embodiment, the incident surface is provided on the side surface of the rod-shaped light guide as shown in FIG. 5 instead of the end surface as in the rod-shaped light guide of the second lamp unit 20 in the composite lamp unit of the first embodiment. The point is different. In addition, about the component common to previous embodiment, after attaching the same code | symbol, detailed description is abbreviate | omitted.

  A side surface of the second rod-shaped light guide 21 'is provided with an incident surface 23a and an optical path conversion surface 23b having a V-shaped cross section located on the opposite side of the incident surface 23a. The light incident from the incident surface 23a is reflected by the optical path conversion surface 23b and travels toward the end surfaces on both sides of the second rod-shaped light guide 21 '. By setting it as such a structure, it can be made to shine to the both end surfaces of 2nd rod-shaped light guide 21 'compared with the case where an LED light source is arrange | positioned at the end surface in the case of Embodiment 1 and Embodiment 2. Therefore, for example, it is possible to reduce the size of the non-light emitting portion at the boundary between the second lamp unit 20 and the third lamp unit 30 shown in FIG.

  The above embodiment is merely an example in all respects. The present invention is not construed as being limited to these descriptions. For example, LEDs of different emission colors may be used as the first light source 12 and the second light source 22. In that case, when the first light source 12 and the second light source 22 are turned on simultaneously, emission of mixed light can be obtained at the boundary portion 25 where the first lamp unit 10 and the second lamp unit 20 emit light. it can.

  The present invention can be used for vehicle lamps such as a head lamp, a fog lamp, a tail lamp, a parking lamp, a clearance lamp, a stop lamp, a turn signal lamp, a side marker lamp, and a backup lamp.

DESCRIPTION OF SYMBOLS 1 ... Composite lamp unit 10 ... 1st lamp unit 11 ... 1st rod-shaped light guide 12 ... 1st light source 13 ... Incident surface 14 ... Outgoing surface 15 ... Front side surface 16 ... Reflective surface 17 ... Back side surface 18 ... End part 19 ... Thin-walled exit surface 20 ... second lamp unit 21 ... second rod-shaped light guide 22 ... second light source 23 ... incident surface 24 ... outgoing surface 25 ... front side surface 26 ... reflecting surface 27 ... back side surface 28 ... end 29 ... thin wall Part incident surface 30 ... Third lamp unit 35 ... Boundary part 37 ... Light emitting part 41 ... Rear lamp 42 ... Rear lamp 43 ... Rear license lamp 44 ... Housing 45 ... Outer lens 46 ... Screw 47 ... Housing 48 ... Outer lens 49 ... Screw 51 ... Front combination 52 ... Front grille 53 ... Accessory lamp 90 ... Backlight 91 ... Linear light emitter 92 ... Translucent Shaped body 93 ... reflector 94 ... LED light source 95 ... housing 96 ... non-light emitting portion 97 ... light-emitting unit BL1, BL2 ... borderline

Claims (2)

A first lamp unit having a light-transmitting first rod-shaped light guide and a first light source for entering light into the first rod-shaped light guide;
A second lamp unit having a light-transmitting second rod-shaped light guide and a second light source that makes light incident on the second rod-shaped light guide is a composite lamp unit provided adjacently,
The first rod-shaped light guide and the second rod-shaped light guide include a front side surface provided with an emission surface extending in a longitudinal direction, and a rear side surface located on the opposite side of the front side surface and having a reflection surface,
An end of the first rod-shaped light guide on the second rod-shaped light guide side is configured in a stepped shape in which a part of the front side surface is cut out in the front-rear direction of the rod-shaped light guide,
An end of the second rod-shaped light guide on the first rod-shaped light guide side is configured in a stepped shape in which a part of the rear side surface is notched in the front-rear direction of the rod-shaped light guide,
In the adjacent region of the first rod-shaped light guide and the second rod-shaped light guide, the stepped ends of the respective rod-shaped light guides are opposed to each other, and the step of the first rod-shaped light guide is provided. It is arranged so that the stepped shape of the second rod-shaped light guide is located in front of the shape,
The front side surface of the first rod-shaped light guide and the front side surface of the second rod-shaped light guide are designed so that the front side surfaces of the first rod-shaped light guide are coherent with each other from the first light source and the second light source. It is arranged to emit the light incident on the light guide,
The end portion of the first rod-shaped light guide having a stepped shape has a front side surface thinned in the front-rear direction as a thin-walled exit surface,
The stepped end of the second rod-shaped light guide has a thin portion incident on the rear side surface that is thin in the front-rear direction, and the light emitted from the thin portion exit surface of the first rod-shaped light guide is incident on it. A surface is provided, and both the light emitted from the first light source and the second light source are emitted from the front side surface facing the thin-walled incident surface,
The composite lamp unit, wherein the thin portion entrance surface and the thin portion exit surface are arranged in parallel.
A composite lamp unit according to claim 1;
A lighting device capable of independently controlling lighting of the first light source and the second light source,
The first light source and the second light source are LEDs that emit the same emission color;
The lighting device is a vehicle lamp characterized in that the first light source and the second light source are turned on simultaneously or only one of the light sources is turned on.

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