JP6949069B2 - Lighting unit and vehicle lighting - Google Patents

Description

The present invention relates to a lamp unit and a vehicle lamp.

Conventionally, those using a light emitting diode (LED: Light Emitting Diode), which is a semiconductor light emitting element, as a light source of a vehicle lamp have been put into practical use. Further, a type in which a plurality of LEDs are arranged in an array and a light distribution pattern is controlled by using a reflecting mirror and a projection lens has also been proposed.

Further, in recent years, as a high beam directed upward from the horizon, a light distribution variable high beam (ADB: Adaptive Driving Beam) technique for irradiating a plurality of irradiation regions divided in the left-right direction with light has been proposed. (See, for example, Patent Document 1). In the headlights for vehicles using such ADB technology, the LED array is controlled so as to detect a vehicle in front such as a preceding vehicle or an oncoming vehicle and individually non-illuminate the area corresponding to the position. So, I try not to give glare to the driver of the vehicle in front.

In the prior art described in Patent Document 1, a lamp unit in which an LED array for low beam and an LED array for ADB are mounted on a common heat sink, and a mirror and a projection lens for reflecting light emitted from each are provided. Consists of. As described above, in the ADB technology, LEDs are arranged so as to irradiate a plurality of irradiation regions with light, so that when the irradiation region is subdivided, the number of LEDs mounted increases and the amount of heat generated increases. Will increase. Further, even in a vehicle lamp that does not use the ADB technology, the amount of heat generated tends to increase as the amount of light increases.

In general, it is known that the luminous efficiency and the wavelength of the emitted light are affected by the temperature of the light emitted by the LED, and it is necessary to improve the heat dissipation of the lamp unit in order to make the LED emit light in an appropriate temperature range. be. However, in the prior art of Patent Document 1, since it is necessary to increase the size of the heat sink in order to improve the heat dissipation, it is difficult to achieve both the miniaturization of the lamp unit and the improvement of the heat dissipation.

Further, in the prior art described in Patent Document 1, reflectors are individually used for the low beam LED array and the ADB LED array, the number of parts is large, and the optical axis adjustment of each optical system is complicated. There was a problem that it was.

JP-A-2018-018590

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and although it is provided with a plurality of light emitting elements and an optical system that irradiate different irradiation regions with light, the number of parts can be reduced and the optical axis can be easily adjusted. It is an object of the present invention to provide a lamp unit and a vehicle lamp capable of improving heat dissipation.

In order to solve the above problems, in the lamp unit of the present invention, the first substrate on which the first light emitting element is mounted on the first mounting surface and the second light emitting element on the second mounting surface are mounted on the first mounting surface. A second substrate on which the second mounting surface is arranged facing the surface, a first heat radiating portion provided in contact with the back surface side of the first substrate, and a second substrate provided in contact with the back surface side of the second substrate. It has a second heat radiation unit, a first reflecting surface that reflects light from the first light emitting element, and a second reflecting surface that reflects light from the second light emitting element, and the first mounting surface. It includes a reflective member arranged between the second mounting surface, and the reflective member has a lower substrate mounting portion on which the first substrate is mounted and an upper substrate mounting portion on which the second substrate is mounted. The lower substrate mounting portion has a first positioning pin, and the first substrate is positioned with respect to the reflective member by inserting the first positioning pin into the first positioning hole, and the first positioning pin is positioned. The upper substrate mounting portion has a second positioning pin, the second substrate is positioned with respect to the reflection member by inserting the second positioning pin into the second positioning hole, and the first heat radiating portion is A first stretched portion extending forward in the light irradiation direction from the first substrate is provided, and the second heat radiating portion extends forward in the light irradiation direction from the second substrate. A stretched portion is provided, and in front of the first stretched portion and the second stretched portion, a lens portion for irradiating the light reflected by the first reflecting surface and / or the second reflecting surface forward is provided. The second heat radiating portion is arranged above the first heat radiating portion, and the distance between the first stretched portion and the second stretched portion expands toward the lens portion side to hold the optical member that holds the lens portion. The optical member holding portion has an opening, and the lower end of the opening is formed below the upper portion of the front end of the first extending portion.

In such a lamp unit of the present invention, a reflective member is arranged between the first substrate and the second substrate, a first heat radiating portion is provided on the back surface side of the first substrate, and a second heat radiating portion is provided on the back surface side of the second substrate. By providing a heat radiating unit, the number of parts can be reduced, the optical axis can be easily adjusted, and the heat radiating property is improved, while having a plurality of light emitting elements and an optical system that irradiate different irradiation regions with light. It becomes possible to make it.

Further, in one aspect of the present invention, the lens portion is held by the optical member holding portion via a lens holder .

Further, in one aspect of the present invention, the first substrate and the second substrate are arranged so as to be inclined so as to be separated from each other in the light irradiation direction.

Further, in one aspect of the present invention, the first stretched portion and the second stretched portion are part of the heat radiation fins, and the space communicates between them to form an air flow flow path.

Further, in one aspect of the present invention, the first heat radiating portion has a lower substrate contacting portion with which the back surface side of the first substrate is in contact, and the second heat radiating portion is in contact with the back surface side of the second substrate. It has an upper substrate contact portion that is in contact with the lower substrate contact portion and the upper substrate contact portion is inclined with respect to the horizontal direction, and the distance between the lower substrate contact portion and the upper substrate contact portion is narrowed in the front.

Further, the vehicle lamp of the present invention is characterized by including any one of the above lamp units.

In the present invention, a lamp capable of reducing the number of parts, easily adjusting the optical axis, and improving heat dissipation while providing a plurality of light emitting elements and an optical system that irradiate different irradiation regions with light. Unit and vehicle optics can be provided.

It is an exploded perspective view which shows the outline of the lamp unit 100 in this embodiment. FIG. 2A is a schematic perspective view showing the structure of the extension 10, FIG. 2B is a schematic perspective view showing the structure of the projection lens 20, and FIG. 2C is a schematic perspective view of the lens holder 30. It is a schematic perspective view which shows the structure. It is a figure which shows typically the structure of the lower side heat dissipation part 40, FIG. 3A is a schematic perspective view, and FIG. 3B is a top view. It is a figure which shows typically the structure of the upper heat dissipation part 50, FIG. 4A is a schematic perspective view, and FIG. 4B is a top view. It is a figure which shows typically the structure of the reflection member 60, FIG. 5A is an upper perspective view, and FIG. 5B is a lower perspective view. FIG. 6A is a top view schematically showing the structure of the lower substrate 70, and FIG. 6B is a top view schematically showing the structure of the upper substrate 80. It is a top view which shows the lamp unit 100 in the assembled state. FIG. 8A is a diagram schematically showing a cross section of the lamp unit 100, FIG. 8A shows a cross section at the AA position in FIG. 7, and FIG. 8B is a cross section at the BB position in FIG. The cross section is shown. It is a figure which shows the operation of the lamp unit 100 schematically, FIG. 9A shows the light irradiation from a light emitting element 72, 82, and FIG. 9B shows the convection of air.

(First Embodiment)
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or equivalent components, members, and processes shown in the drawings shall be designated by the same reference numerals, and redundant description will be omitted as appropriate. FIG. 1 is an exploded perspective view showing an outline of the lamp unit 100 according to the present embodiment. In the following description, the vertical direction of the drawing is the vertical direction of the lamp unit 100, the direction in which the lamp unit 100 irradiates light is the front, and the in-plane direction parallel to the front-rear direction is the horizontal direction.

As shown in FIG. 1, the lamp unit 100 includes an extension 10, a projection lens 20, a lens holder 30, a lower heat radiation unit 40, an upper heat radiation unit 50, a reflection member 60, a lower substrate 70, and an upper side. The substrate 80 is provided. Each part constituting the lamp unit 100 will be described in detail with reference to FIGS. 2 to 6.

The extension 10 is a member for preventing light from leaking forward from the inside of the lamp unit 100 and concealing each part of the lamp unit 100 from the outside of the vehicle lamp. Further, the extension 10 is fixed to the lens holder 30 and sandwiches the projection lens 20 with the lens holder 30.

The projection lens 20 is an optical member for irradiating light forward from the lamp unit 100 with a desired light distribution pattern. The projection lens 20 is positioned on the entire surface of the lens holder 30, and is sandwiched between the extension 10 and the lens holder 30. The material constituting the projection lens 20 is not limited, but for example, it is preferable to use acrylic having good translucency and light weight.

The lens holder 30 is a member that holds the projection lens 20 so that the optical axis is in a predetermined position. The projection lens 20 is positioned on the lens holder 30, and the extension 10 is fixed so that the projection lens 20 is sandwiched between the lens holder 30 and the lens holder 30. Further, the lens holder 30 is positioned and fixed in front of the lower heat radiating portion 40 so that the lower radiating portion 40 and the projection lens 20 are aligned with each other. The material constituting the lens holder 30 is not limited, but for example, it is preferable to use polycarbonate which is lightweight and has excellent mechanical strength.

The lower heat radiating portion 40 is arranged so that the back surface side of the lower substrate 70 is in contact with the upper portion thereof, and is a member for radiating heat generated by a light emitting element mounted on the lower substrate 70, and is a member of the present invention. It corresponds to the first heat dissipation part. Further, the reflection member 60, the upper substrate 80, and the upper heat radiating unit 50 are also positioned and mounted on the lower heat radiating unit 40. Further, the lens holder 30 is positioned and fixed in front of the lower heat radiating portion 40. The lower heat radiating portion 40 is preferably made of a material having good thermal conductivity, and for example, aluminum die casting can be used.

The upper heat radiating portion 50 is arranged so that the back surface side of the upper substrate 80 is in contact with the lower portion thereof, and is a member for radiating heat generated by the light emitting element mounted on the upper substrate 80, and is the second heat radiating portion in the present invention. It corresponds to the department. Further, the upper heat radiation unit 50 is fixed to the lower heat radiation unit 40, and holds the lower substrate 70, the reflection member 60, and the upper substrate 80 between the lower heat radiation unit 40. The upper heat radiating portion 50 is preferably made of a material having good thermal conductivity, and for example, aluminum die casting can be used.

The reflection member 60 is an optical member that is arranged between the lower substrate 70 and the upper substrate 80 and reflects the light from the light emitting element mounted on the lower substrate 70 and the upper substrate 80 toward the projection lens 20. Further, the lower heat radiating unit 40 and the upper heat radiating unit 50 are positioned and fixed with respect to the reflective member 60 with the reflective member 60 interposed therebetween. The material constituting the reflective member 60 is not limited, but it is preferable to use polycarbonate which is lightweight and has excellent mechanical strength.

The lower substrate 70 is a circuit board in which a light emitting element is mounted on the front surface side and the back surface side is arranged in contact with the lower heat radiating portion 40, and corresponds to the first substrate in the present invention. The upper substrate 80 is a circuit board in which a light emitting element is mounted on the front surface side and the back surface side is arranged in contact with the upper heat radiating portion 50, and corresponds to the second substrate in the present invention. The lower substrate 70 and the upper substrate 80 are provided with a wiring pattern, a circuit unit, and a connector unit (not shown), and power and signals are supplied to the circuit unit and the light emitting element from the outside of the electrically connected lamp unit 100. Will be done. The materials constituting the lower substrate 70 and the upper substrate 80 are not limited, and a material having an insulating layer formed on a metal substrate, a ceramic substrate, a resin substrate, or the like can be used, and is lightweight and has excellent thermal conductivity. It is preferable to use an aluminum substrate.

Further, the lower substrate 70 and the upper substrate 80 are respectively positioned and fixed with respect to the reflecting member 60, and the reflecting member 60, the lower heat radiating portion 40, the lens holder 30 and the projection lens 20 are positioned and fixed to each other. It is fixed. Therefore, the light emitting elements mounted on the lower substrate 70 and the upper substrate 80 are arranged at positions whose optical axes are adjusted with respect to the reflecting member 60 and the projection lens 20.

FIG. 2A is a schematic perspective view showing the structure of the extension 10, FIG. 2B is a schematic perspective view showing the structure of the projection lens 20, and FIG. 2C is a schematic perspective view of the lens holder 30. It is a schematic perspective view which shows the structure.

As shown in FIG. 2A, the extension 10 includes a main body portion 11, an opening portion 12, and a mounting portion 13. The main body 11 is a cover that covers from the front surface of the lens holder 30 to the side surfaces of the lower heat radiation portion 40 and the upper heat radiation portion 50, and an opening 12 and a mounting portion 13 are formed in a part thereof. The opening 12 is an opening provided at a position corresponding to the projection lens 20 in the main body 11. The mounting portion 13 is provided on the rear surface side of the main body portion 11 and is a portion for positioning and fixing to the lens holder 30.

As shown in FIG. 2B, the projection lens 20 includes a flange portion 21, a lens portion 22, and a positioning portion 23. The flange portion 21 is a flat plate-shaped portion integrally formed along the outer circumference of the lens portion 22. The lens portion 22 is a portion having a curved surface shape formed so as to project forward from the flange portion 21, and is an optical element that determines the orientation distribution of light emitted forward. The positioning portion 23 is a through hole provided in the flange portion 21 and is used for positioning with the lens holder 30.

As shown in FIG. 2C, the lens holder 30 includes a holding portion 31, an opening portion 32, and a positioning portion 33. The holding portion 31 is a portion that holds the projection lens 20 and the extension 10 and is fixed to the lower heat radiating portion 40. The opening 32 is an opening formed at a position corresponding to the rear surface of the projection lens 20, and the peripheral edge thereof has a shape corresponding to the flange portion 21. The positioning portion 33 is a through hole provided in the holding portion 31, and is used for positioning and fixing with the lower heat radiating portion 40.

3A and 3B are views schematically showing the structure of the lower heat radiating portion 40, FIG. 3A is a schematic perspective view, and FIG. 3B is a top view. As shown in FIGS. 3A and 3B, the lower heat radiating portion 40 includes an optical member holding portion 41, an opening 42, an optical member fixing portion 43, a lower substrate contact portion 44, and a lower side. It has a heat radiation fin 45, a lower flow path portion 46, a reflection member fixing portion 47, and an upper heat radiation portion fixing portion 48.

The optical member holding portion 41 is a plate-shaped portion erected in front of the lower heat radiating portion 40, and is a portion for fixing the lens holder 30 on the front surface side thereof. Further, in the optical member holding portion 41, an opening 42 is formed substantially in the center, and an optical member fixing portion 43 is formed in the front surface. In the present embodiment, an example in which the optical member holding portion 41 is integrally formed with the lower heat radiating portion 40 is shown, but the optical member holding portion 41 may be formed integrally with the upper heat radiating portion 50.

The opening 42 is an opening provided in the optical member holding portion 41, and constitutes an optical path space through which light passes from the rear of the optical member holding portion 41 to the lens portion 22 through the opening 32 of the lens holder 30. There is. The lower end of the opening 42 is formed to a position lower than the front end of the lower heat radiation fin 45, and the upper part of the front end of the lower heat radiation fin 45 is partially exposed from the opening 42.

The optical member fixing portion 43 is formed at a position corresponding to the positioning portion 33, and is a portion to which the lens holder 30 is fastened by using a fixing member such as a screw. FIG. 3 shows an example in which the optical member fixing portions 43 are formed at three locations above and below the opening 42, but the positions and the number are not limited.

The lower substrate contact portion 44 is a portion provided behind the lower heat radiation portion 40, and is a flat area in which the back surface side of the lower substrate 70 is in contact with the upper surface. Although not shown, the lower substrate contact portion 44 and the back surface of the lower substrate 70 are in contact with each other via TIM (Thermal Interface Material) such as by applying thermal paste. The upper surface of the lower substrate contact portion 44 is an inclined surface whose height decreases from the front to the rear, and a plurality of lower heat radiating fins 45 are erected downward on the lower surface. Further, a reflective member fixing portion 47 is formed on the lower substrate contact portion 44.

The lower heat radiation fins 45 are a plurality of plate-shaped portions erected on the lower surface side of the lower substrate contact portion 44. The lower heat radiation fins 45 are arranged in parallel in the front-rear direction, and a lower flow path portion 46, which is a space through which air flows, is formed between the plates. Further, the lower heat radiation fin 45 is formed so as to extend forward from the lower substrate contact portion 44, and its front end thereof is arranged close to the rear surface of the optical member holding portion 41. Of the lower heat radiation fins 45, the portion between the lower substrate contact portion 44 and the optical member holding portion 41 corresponds to the first stretched portion in the present invention.

The lower flow path portion 46 is a space provided between the plurality of lower heat radiation fins 45. Since air flows in the lower flow path portion 46, a flow path in the front-rear direction is formed on the lower surface side of the lower substrate contact portion 44, and between the lower substrate contact portion 44 and the optical member holding portion 41. Then, the flow paths in the front-rear direction and the up-down direction are constructed.

The reflective member fixing portion 47 is a hole into which a screw or the like for fixing the lower substrate 70 is inserted. The upper heat radiating portion fixing portion 48 is provided with a pedestal provided substantially in the center in the height direction of the opening 42 and a hole formed in the pedestal, and is a portion for fixing the upper heat radiating portion 50.

4A and 4B are views schematically showing the structure of the upper heat radiating portion 50, FIG. 4A is a schematic perspective view, and FIG. 4B is a top view. As shown in FIGS. 4A and 4B, the upper heat radiating portion 50 includes an upper substrate contact portion 51, an upper radiating fin 52, an upper flow path portion 53, a positioning portion 54, and a fixing portion 55. have.

The upper substrate contact portion 51 is a portion provided behind the upper heat radiation portion 50, and is a flat area in which the back surface side of the upper substrate 80 is in contact with the lower surface. Although not shown, the contact portion 51 between the upper substrate contact portion 51 and the back surface of the upper substrate 80 is in contact with each other via TIM, such as by applying thermal paste. The lower surface of the upper substrate contact portion 51 is an inclined surface whose height increases from the front to the rear, and a plurality of upper heat radiating fins 52 are erected upward on the upper surface. Further, a fixing portion 55 is formed on the upper substrate contact portion 51.

The upper heat radiating fins 52 are a plurality of plate-shaped portions erected on the upper surface side of the upper substrate contact portion 51. The upper heat radiating fins 52 are arranged in parallel in the front-rear direction, and an upper flow path portion 53, which is a space through which air flows, is formed between the plates. Further, the upper heat radiation fin 52 is formed so as to extend forward from the upper substrate contact portion 51, and its front end thereof is close to the rear surface of the optical member holding portion 41. Of the upper heat radiation fins 52, the portion between the upper substrate contact portion 51 and the optical member holding portion 41 corresponds to the second stretched portion in the present invention.

The upper flow path portion 53 is a space provided between the plurality of upper heat radiation fins 52. Since air flows in the upper flow path portion 53, a flow path in the front-rear direction is formed on the upper surface side of the upper substrate contact portion 51, and a front-rear direction is formed between the upper substrate contact portion 51 and the optical member holding portion 41. And a vertical flow path is constructed.

It is a protrusion formed on the lower surface of the positioning portion 54 and the upper substrate contact portion 51, and is a portion that is inserted into a positioning hole provided in the reflective member 60 to position the reflective member 60. The fixing portion 55 is a through hole provided in the upper substrate contact portion 51, and is a portion into which a fixing member such as a screw is inserted to fix the reflection member 60 and the lower heat radiating portion 40.

5A and 5B are views schematically showing the structure of the reflective member 60, FIG. 5A is an upward perspective view, and FIG. 5B is a downward perspective view. As shown in FIGS. 5A and 5B, the reflective member 60 includes an upper substrate mounting portion 61, an upper reflecting surface 62, a lower substrate mounting portion 63, a lower reflecting surface 64, and a fixing portion 65. , The positioning pins 66 and 67 are provided. When the reflective member 60 is molded from a resin such as polycarbonate, a reflective film is formed on the surfaces of the upper reflective surface 62 and the lower reflective surface 64 by silver vapor deposition or the like. Here, the lower reflecting surface 64 corresponds to the first reflecting surface in the present invention, and the upper reflecting surface 62 corresponds to the second reflecting surface in the present invention.

The upper substrate mounting portion 61 is a surface that constitutes the upper surface of the reflective member 60 and mounts the upper substrate 80, and is formed as an inclined surface that is separated from the central surface in the horizontal direction. The upper reflecting surface 62 is a curved surface formed at the front end portion of the upper substrate mounting portion 61, and reflects light from a light emitting element mounted on the upper substrate 80 forward as will be described later. The upper reflecting surface 62 has a spheroidal shape in which each light emitting element is arranged near the focal point.

The lower substrate mounting portion 63 is a surface that constitutes the lower surface of the reflective member 60 and mounts the lower substrate 70, and is formed as an inclined surface that is separated from the central surface in the horizontal direction. The lower reflecting surface 64 is a curved surface formed at the front end portion of the lower substrate mounting portion 63, and reflects light from a light emitting element mounted on the lower substrate 70 forward as will be described later. The lower reflecting surface 64 has a spheroidal shape in which each light emitting element is arranged near the focal point.

The fixing portion 65 is a through hole formed corresponding to a screw hole (not shown) provided in the upper heat radiating portion 50 and a position of the upper radiating portion fixing portion 48. The positioning pins 66 and 67 are protrusions formed at positions corresponding to the positioning holes 73 and 83 formed in the upper substrate 80 and the lower substrate 70, respectively.

FIG. 6A is a top view schematically showing the structure of the lower substrate 70, and FIG. 6B is a top view schematically showing the structure of the upper substrate 80. As shown in FIG. 6A, the lower substrate 70 has an element mounting surface 71, a plurality of light emitting elements 72, and a positioning hole 73. As shown in FIG. 6B, the upper substrate 80 has an element mounting surface 81, a plurality of light emitting elements 82, and a positioning hole 83. Although not shown in FIG. 6, wiring patterns are formed and various electronic components are mounted on the element mounting surfaces 71 and 81.

As shown in FIG. 1, the element mounting surface 71 is the upper surface of the lower substrate 70, constitutes a surface on which the light emitting element 72 is mounted, and corresponds to the first mounting surface in the present invention. The light emitting element 72 is a semiconductor light emitting element such as an LED mounted on the element mounting surface 71, and corresponds to the first light emitting element in the present invention. The positioning hole 73 is a through hole formed at a predetermined position on the element mounting surface 71.

As shown in FIG. 1, the element mounting surface 81 is the lower surface of the upper substrate 80, constitutes a surface on which the light emitting element 82 is mounted, and corresponds to the second mounting surface in the present invention. The light emitting element 82 is a semiconductor light emitting element such as an LED mounted on the element mounting surface 81, and corresponds to the second light emitting element in the present invention. The positioning hole 83 is a through hole formed at a predetermined position on the element mounting surface 81.

FIG. 7 is a top view showing the lamp unit 100 in the assembled state. As shown in FIGS. 1 to 6, in the lamp unit 100 of the present embodiment, the flange portion 21 is arranged in front of the opening 32, and the protrusion provided in the vicinity of the opening 32 is inserted into the positioning portion 23. As a result, the projection lens 20 is positioned on the lens holder 30. Further, the flange portion 21 is sandwiched between the main body portion 11 and the holding portion 31 by inserting the lens portion 22 into the opening portion 12 and engaging the mounting portion 13 with the protruding portion of the holding portion 31. Further, the lens holder 30 is positioned and fixed to the lower heat radiating portion 40 by aligning the positioning portion 33 and the optical member fixing portion 43 and fastening them with screws or the like.

Further, the upper substrate 80 and the lower substrate 70 are positioned with respect to the reflection member 60 by inserting the positioning pins 66 and 67 into the positioning holes 83 and 73, respectively, and are fixed by a fixing member such as a screw. Therefore, in the reflective member 60, the element mounting surface 71 faces the lower substrate mounting portion 63, and the element mounting surface 81 faces the upper substrate mounting portion 61.

Further, the back surface side of the lower substrate 70 is arranged in contact with the lower substrate contact portion 44, and the upper substrate contact portion 51 is arranged in contact with the back surface side of the upper substrate 80. Therefore, the lower substrate 70, the reflective member 60, the upper substrate 80, and the upper heat radiating portion 50 are arranged in this order on the lower heat radiating portion 40. Here, the upper heat radiating portion fixing portion 48 and the fixing portion 65 are aligned with screw holes (not shown) provided in the upper heat radiating portion 50 and fastened with screws or the like. Further, screws are inserted into the reflective member fixing portion 47 and the fixing portion 55, and are fastened so as to be aligned with the screw holes posted on the lower substrate 70 and the upper substrate 80, respectively.

As described above, in the lamp unit 100, each member of the extension 10, the projection lens 20, the lens holder 30, the lower heat radiation unit 40, the upper heat radiation unit 50, the reflection member 60, the lower substrate 70, and the upper substrate 80 is positioned. And fixed. Since the upper reflecting surface 62 and the lower reflecting surface 64 are integrally formed in the reflecting member 60, the optical axes of the light emitting element 82 mounted on the upper substrate 80 and the light emitting element 72 mounted on the lower substrate 70. The alignment can be done all at once. This reduces the number of parts of the lamp unit 100 and facilitates the adjustment of the optical axis.

8A and 8B are views schematically showing a cross section of the lamp unit 100, FIG. 8A shows a cross section at the AA position in FIG. 7, and FIG. 8B shows B- in FIG. The cross section at the B position is shown. As shown in FIGS. 8A and 8B, the lower substrate contact portion 44 is inclined so that the rear portion is lowered with respect to the horizontal direction, and the upper substrate contact portion 51 is inclined so as to be rearward with respect to the horizontal direction. It is inclined like. Therefore, the lower substrate 70 and the upper substrate 80 arranged in contact with the lower substrate contact portion 44 and the upper substrate contact portion 51 are arranged so as to be inclined so as to be separated from each other in the light irradiation direction. There is.

Further, the portion of the lower heat radiation fin 45 that is extended to the front of the lower substrate contact portion 44 is the lower extension portion 45a, and the portion of the upper heat radiation fins 52 that is extended forward of the upper substrate contact portion 51. The portion stretched to is the upper stretched portion 52a. An optical path space 90 through which light passes up to the lens portion 22 is configured in front of the lower substrate contact portion 44 and the upper substrate contact portion 51.

As shown in FIG. 8A, the upper end side of the lower extension portion 45a is inclined so that the front side is lowered with respect to the horizontal direction, and the upper end side of the upper extension portion 52a is inclined so that the front side is raised with respect to the horizontal direction. It is tilted. Therefore, the distance between the lower stretching portion 45a and the upper stretching portion 52a is widened toward the lens portion 22 side. Further, as shown in FIG. 8B, the lower flow path portion 46 and the upper flow path portion 53 communicate with each other through the optical path space 90 through which the air flows.

9A and 9B are diagrams schematically showing the operation of the lamp unit 100, FIG. 9A shows light irradiation from the light emitting elements 72 and 82, and FIG. 9B shows air convection. As shown in FIG. 9A, in the lamp unit 100, the light emitted by the light emitting elements 72 and 82 is reflected as reflected light L1 and L2 in the lens portion 22 direction by the lower reflecting surface 64 and the upper reflecting surface 62, respectively. , The lens unit 22 irradiates the front with a predetermined light distribution pattern. As described above, the lower reflecting surface 64 and the upper reflecting surface 62 are formed as spheroidal surfaces, respectively, and the light emitting elements 72 and 82 are arranged at one of the focal points. Therefore, the reflected lights L1 and L2 are imaged at the other focal position, and then expand to the lens unit 22 and proceed.

The heat generated by the light emitting elements 72 and 82 is dissipated through the lower substrate 70, the upper substrate 80, the lower heat radiating unit 40, and the upper heat radiating unit 50, respectively. Therefore, the area of the upper heat radiating fins 52 and the lower heat radiating fins 45 standing on the upper and lower surfaces of the lamp unit 100 can be increased to improve the heat radiating property. Further, since the upper heat radiation fin 52 and the lower heat radiation fin 45 are provided with the upper extension portion 52a and the lower extension portion 45a, respectively, the required optical path length from the light emitting elements 72 and 82 to the lens portion 22 can be effectively achieved. It can be used to further improve heat dissipation.

As described above, the lower end of the opening 42 is formed to a position lower than the front end of the lower heat radiation fin 45, and the upper part of the front end of the lower extending portion 45a is partially exposed from the opening 42. As a result, convection of air from the lower flow path portion 46 to the optical path space 90 and the upper flow path portion 53 is likely to occur, and the heat dissipation efficiency can be further improved. Further, when the inside is visually recognized from the front of the lamp unit 100 via the lens portion 22, the upper extension portion 52a and the lower extension portion 45a can be visually recognized, so that the design of the lamp unit 100 can be improved. Can be done.

As described above, in the lamp unit 100, the lower substrate 70 and the upper substrate 80 are arranged so as to increase the distance toward the rear. As a result, the spreading angle of the reflected lights L1 and L2 after being imaged at the focal position can be reduced, and the area of the region reaching the lens portion 22 can be reduced. Therefore, the lens unit 22, the projection lens 20, and the lamp unit 100 can be made smaller and lighter.

Further, the image formation positions of the reflected lights L1 and L2 are near the front ends of the lower substrate contact portion 44 and the upper substrate contact portion 51. As a result, the lower substrate contact portion 44, the upper substrate contact portion 51, the lower extension portion 45a and the upper extension portion 52a are formed up to the vicinity of the optical path of the reflected light L1 and L2, and the lower heat radiation fin 45 and the upper heat radiation The area of the fins 52 can be expanded. At this time, since the distance between the lower extending portion 45a and the upper extending portion 52a is increasing toward the front, the area can be expanded without blocking the reflected light L1 and L2.

As shown in FIG. 9B, the space of the lower flow path portion 46 and the upper flow path portion 53 communicate with each other, and air convection C1 from the lower flow path portion 46 toward the upper flow path portion 53 C2 occurs. This is because the heat generated by the light emitting elements 72 and 82 is dissipated into the air by the lower heat radiating fins 45 and the upper heat radiating fins 52, and the warmed air rises. In the region where the lower extending portion 45a and the upper extending portion 52a are provided, the space communicates from the lower side to the upper side of the lamp unit 100, so that the convection C1 flows in the direct upward direction. Therefore, cold air can be efficiently taken in by the lower stretching portion 45a and the upper stretching portion 52a to dissipate good heat.

On the other hand, in the region where the lower substrate contact portion 44 and the upper substrate contact portion 51 are provided, the air flow is blocked by the lower substrate contact portion 44 and the upper substrate contact portion 51. Therefore, the convection C2 flows along the inclination of the lower substrate contact portion 44 and the upper substrate contact portion 51. Here, the lower substrate contact portion 44 and the upper substrate contact portion 51 are each inclined with respect to the horizontal direction, and the distance between them is narrowed in the front direction. As a result, the airflow rising along the lower surface of the lower substrate contact portion 44 efficiently flows into the upper part of the upper substrate contact portion 51, and good heat dissipation can be performed.

As described above, in the lamp unit 100 and the vehicle lamp of the present embodiment, the upper reflecting surface 62 and the lower reflecting surface 64 are collectively formed on the reflecting member 60, so that the light of the light emitting element 82 and the light emitting element 72 is formed. Axis alignment can be performed collectively, reducing the number of parts and facilitating optical axis adjustment. Further, since the lower substrate 70 and the upper substrate 80 are provided so that the lower substrate contact portion 44 and the upper substrate contact portion 51 are in contact with each other on the back surface side, the upper heat radiation fin 52 and the lower heat radiation fin 45 are provided. The area can be increased to improve heat dissipation.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. The description of the contents overlapping with the first embodiment will be omitted. In the first embodiment, both the lower substrate 70 and the upper substrate 80 are arranged so as to be inclined with respect to the horizontal direction, but one of them is arranged horizontally and the other is arranged so as to be inclined. It may be.

The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and the embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Is also included in the technical scope of the present invention.

100 ... Lighting unit 10 ... Extension 20 ... Projection lens 30 ... Lens holder 40 ... Lower heat dissipation part 50 ... Upper heat dissipation part 60 ... Reflective member 70 ... Lower board 80 ... Upper board 11 ... Main body 12 ... Opening 13 ... Mounting Part 21 ... Flange part 22 ... Lens part 23 ... Positioning part 31 ... Holding part 32 ... Opening 33 ... Positioning part 41 ... Optical member holding part 42 ... Opening 43 ... Optical member fixing part 44 ... Lower substrate contact Part 45 ... Lower heat dissipation fin 45a ... Lower extension part 46 ... Lower flow path part 47 ... Reflective member fixing part 48 ... Upper heat dissipation part fixing part 51 ... Upper substrate contact part 52 ... Upper heat radiation fin 52a ... Upper extension part 53 ... Upper flow path portion 54 ... Positioning portion 55 ... Fixing portion 61 ... Upper board mounting portion 62 ... Upper reflecting surface 63 ... Lower substrate mounting portion 64 ... Lower reflecting surface 65 ... Fixed portion 66 ... Positioning pin 71 ... Element mounting surface 72 ... Light emitting element 73 ... Positioning hole 81 ... Element mounting surface 82 ... Light emitting element 83 ... Positioning hole 90 ... Optical path space C1, C2 ... Convection L1, L2 ... Reflected light

Claims (6)

A first substrate on which the first light emitting element is mounted on the first mounting surface,
A second substrate on which the second light emitting element is mounted on the second mounting surface and the second mounting surface is arranged so as to face the first mounting surface.
A first heat radiating portion provided in contact with the back surface side of the first substrate,
A second heat radiating portion provided in contact with the back surface side of the second substrate,
It has a first reflecting surface that reflects light from the first light emitting element and a second reflecting surface that reflects light from the second light emitting element, and is between the first mounting surface and the second mounting surface. Equipped with a reflective member placed in
The reflective member has a lower substrate mounting portion on which the first substrate is mounted and an upper substrate mounting portion on which the second substrate is mounted.
The lower board mounting portion has a first positioning pin and has a first positioning pin.
The first substrate is positioned with respect to the reflective member by inserting the first positioning pin into the first positioning hole, and at the same time, the first substrate is positioned with respect to the reflective member.
The upper board mounting portion has a second positioning pin and has a second positioning pin.
The second substrate is positioned with respect to the reflective member by inserting the second positioning pin into the second positioning hole.
The first heat radiating portion is provided with a first stretched portion that is stretched forward in the light irradiation direction with respect to the first substrate.
The second heat radiating portion is provided with a second stretched portion that is stretched forward in the light irradiation direction with respect to the second substrate.
In front of the first stretched portion and the second stretched portion, a lens portion for irradiating the light reflected by the first reflecting surface and / or the second reflecting surface forward is provided.
The second heat radiating unit is arranged above the first heat radiating unit.
The distance between the first stretched portion and the second stretched portion is widened toward the lens portion side.
The optical member holding portion for holding the lens portion is provided, and the optical member holding portion has an opening.
A lamp unit characterized in that the lower end of the opening is formed below the upper portion of the front end of the first extending portion. The lamp unit according to claim 1.
A lamp unit characterized in that the lens portion is held by the optical member holding portion via a lens holder. The lamp unit according to claim 1 or 2.
A lamp unit characterized in that the first substrate and the second substrate are arranged so as to be inclined so as to be separated from each other in the rear in the light irradiation direction. The lamp unit according to any one of claims 1 to 3.
A lamp unit characterized in that the first stretched portion and the second stretched portion are a part of heat radiation fins, and a space communicates between them to form an air flow flow path. The lamp unit according to any one of claims 1 to 4.
The first heat radiating portion has a lower substrate abutting portion with which the back surface side of the first substrate is abutted.
The second heat radiating portion has an upper substrate abutting portion with which the back surface side of the second substrate is abutted.
A lamp unit characterized in that the lower substrate contact portion and the upper substrate contact portion are inclined with respect to the horizontal direction, respectively, and the distance between them is narrowed in the front. A vehicle lamp comprising the lamp unit according to any one of claims 1 to 5.

Images