WO2024043144A1 - Vehicle lamp - Google Patents

Vehicle lamp Download PDF

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Publication number
WO2024043144A1
WO2024043144A1 PCT/JP2023/029505 JP2023029505W WO2024043144A1 WO 2024043144 A1 WO2024043144 A1 WO 2024043144A1 JP 2023029505 W JP2023029505 W JP 2023029505W WO 2024043144 A1 WO2024043144 A1 WO 2024043144A1
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WO
WIPO (PCT)
Prior art keywords
reflector
light source
light
circuit board
radiation fins
Prior art date
Application number
PCT/JP2023/029505
Other languages
French (fr)
Japanese (ja)
Inventor
一磨 望月
吉将 杉浦
Original Assignee
株式会社小糸製作所
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Filing date
Publication date
Application filed by 株式会社小糸製作所 filed Critical 株式会社小糸製作所
Publication of WO2024043144A1 publication Critical patent/WO2024043144A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/47—Passive cooling, e.g. using fins, thermal conductive elements or openings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
    • F21V29/503—Cooling arrangements characterised by the adaptation for cooling of specific components of light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/502—Cooling arrangements characterised by the adaptation for cooling of specific components
    • F21V29/505—Cooling arrangements characterised by the adaptation for cooling of specific components of reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades

Definitions

  • the present invention relates to the technical field of a vehicular lamp equipped with a heat sink that emits heat generated when a light source is driven and a reflector that reflects light emitted from the light source.
  • a vehicle lamp includes a circuit board on which a light source is mounted, a heat sink that is attached to the front of the circuit board and emits the heat generated when the light source is driven, and a heat sink that is attached to the front of the circuit board and emits the light emitted from the light source.
  • a plurality of radiation fins are formed on the back surface of the heat sink, and heat generated when the light source is driven is radiated through the radiation fins.
  • the vehicle lamp of the present invention aims to improve heat dissipation performance.
  • a vehicular lamp includes: a circuit board on which a light source is mounted; a heat sink to which the circuit board is attached on the side in which light is emitted from the light source and which releases heat generated when the light source is driven;
  • the reflector includes a reflector to which the circuit board is attached on a side opposite to the emission direction and reflects the light emitted from the light source, and the reflector is formed with radiation fins protruding in the emission direction.
  • FIG. 2 is a cross-sectional view of the vehicle lamp.
  • FIG. 3 is an exploded perspective view of the lamp unit.
  • FIG. 3A is a front view of the heat sink.
  • FIG. 3B is a side view of the heat sink.
  • FIG. 4A is a front view of the reflector.
  • FIG. 4B is a side view of the reflector.
  • FIG. 4C is a rear perspective view of the reflector.
  • FIG. 5A is a front view of the lamp unit.
  • FIG. 5B is a top view of the lamp unit.
  • FIG. 5C is a side view of the lamp unit.
  • the direction in which the light is emitted is the front
  • the direction opposite to the direction in which the light is emitted is the rear
  • the direction facing right with respect to the front is the right direction
  • the direction facing left with respect to the front is the left direction
  • the front-rear direction A direction perpendicular to the left-right direction and facing upward will be referred to as an upward direction
  • a direction perpendicular to the front-rear direction and the left-right direction and facing downward will be referred to as a downward direction.
  • FIG. 1 is a sectional view of a vehicle lamp 1. As shown in FIG. FIG. 2 is an exploded perspective view of the lamp unit 6.
  • the vehicular lamp 1 is, for example, a vehicular headlamp, and is attached to both left and right ends of the front end of the vehicle body.
  • the vehicular lamp 1 includes a lamp housing 2 having an opening at the front end, and a cover 3 that closes the opening of the lamp housing 2.
  • the lamp housing 2 and the cover 3 constitute a lamp outer casing 4, and an internal space of the lamp outer casing 4 is formed as a lamp chamber 5.
  • a lamp unit 6 is arranged in the lamp chamber 5.
  • the lamp unit 6 includes a lens holder 10, a projection lens 20, a heat sink 30, a circuit board 40, a primary lens 50, and a reflector 60.
  • the lamp unit 6 is supported by the lamp housing 2 via an optical axis adjustment mechanism (not shown). Therefore, by operating the optical axis adjustment mechanism, it is possible to tilt the lamp unit 6 vertically or horizontally with respect to the lamp housing 2 to adjust the optical axis of the light (aiming adjustment or leveling adjustment). There is.
  • the lens holder 10 has a substantially cylindrical holding cylinder part 11 whose axial direction is arranged along the front-rear direction, and leg parts 12 that respectively protrude rearward from the holding cylinder part 11.
  • a positioning pin 14 is formed on the front surface 13 of the holding cylinder portion 11 and projects forward.
  • the projection lens 20 is held in the holding cylinder part 11 of the lens holder 10.
  • the projection lens 20 is integrally formed with a lens body 21 through which light is transmitted, and a flange-shaped attached portion 22 extending outward from the rear end of the lens body 21.
  • a through hole 23 is formed in the attached portion 22 at a position facing the positioning pin 14 of the lens holder 10.
  • the projection lens 20 is held by the lens holder 10 with the attached portion 22 attached to the holding cylinder portion 11 with the positioning pin 14 inserted into the through hole 23 .
  • the projection lens 20 is formed of, for example, acrylic by injection molding.
  • Acrylic is a suitable material for molding resin parts by injection molding together with polycarbonate, and is a material that has higher transparency and good moldability than polycarbonate, but is known to have lower heat resistance than polycarbonate.
  • the projection lens 20 is held in the lens holder 10 with the lower end of the attached portion 22 at the gate position.
  • the gate position where residual strain may remain is less susceptible to the effects of heat than when the gate position is located upward. It is possible to suppress deformation of a portion where the gate is located.
  • FIG. 3A is a front view of the heat sink 30.
  • FIG. 3B is a side view of the heat sink 30.
  • the heat sink 30 includes a base portion 31, rear radiation fins 32, and front radiation fins 33 that are integrally formed of a metal material with high thermal conductivity.
  • the base portion 31 has a substantially rectangular shape that is longer in the left-right direction and shorter in the up-down direction on a plane perpendicular to the front-rear direction (a plane extending in the up-down direction and the left-right direction), and is formed into a thin flat plate shape in the front-back direction.
  • a plurality of rear radiation fins 32 are attached to the rear surface of the base portion 31 on the rear side. The plurality of rear radiation fins 32 are arranged at equal intervals in the left-right direction.
  • the rear heat dissipation fin 32 has a flat plate shape that is long in the vertical and front-back directions and thin in the left-right direction, and is formed to protrude rearward from the base portion 31. That is, the rear radiation fins 32 are formed in a rectangular cross section that is approximately the same length as the base portion 31 in the vertical direction and sufficiently short in the horizontal direction in a plane perpendicular to the front-rear direction. In addition, among the plurality of rear heat dissipation fins 32, two rear heat dissipation fins 32 from both ends in the left-right direction are formed to have shorter lengths in the vertical direction than the other rear heat dissipation fins 32.
  • a substantially rectangular board mounting surface 34 that is long in the left-right direction and short in the vertical direction is formed at the center of the front surface of the base portion 31. Furthermore, front heat dissipation fins 33 are attached around the board mounting surface 34 on the front surface of the base portion 31 . That is, the front heat radiation fins 33 are arranged so as to surround the reflector 60.
  • the front radiation fins 33 are arranged at the same intervals as the rear radiation fins 32 in the left-right direction.
  • the front heat radiation fin 33 has a flat plate shape that is long in the vertical direction and the front-back direction and thin in the left-right direction, and is formed so as to protrude from the base portion 31 in the front direction.
  • the front radiation fins 33 are formed in a rectangular cross section that is long in the vertical direction and sufficiently short in the horizontal direction in a plane perpendicular to the front-rear direction.
  • the front heat dissipation fins 33 that overlap the board mounting surface 34 in the vertical direction are vertically arranged with the board mounting surface 34 in between. Furthermore, among the front heat dissipation fins 33 , two front heat dissipation fins 33 from both ends in the left-right direction are formed to have shorter vertical lengths than the other front heat dissipation fins 33 . Furthermore, among the front heat dissipation fins 33, the six front heat dissipation fins 33 at the center in the left-right direction are formed to have longer lengths in the front-rear direction than the other front heat dissipation fins 33.
  • Two positioning pins 35 protruding forward and two screw grooves 36 to which the reflector 60 is fastened are formed on the board mounting surface 34.
  • two screw grooves 37 for fastening the lens holder 10 are formed on the front surface of the base portion 31 on both left and right sides of the board mounting surface 34. Then, the lens holder 10 is fixed to the heat sink 30 by screwing the bolt inserted into the through hole 15 formed in the leg portion 12 of the lens holder 10 into the thread groove 37 of the heat sink 30.
  • the circuit board 40 is made of a metal material such as copper that has high thermal conductivity.
  • the circuit board 40 has approximately the same size as the board mounting surface 34 in a plane perpendicular to the front-back direction, that is, it has a substantially rectangular shape that is long in the left-right direction and short in the up-down direction, and is formed into a thin flat plate shape in the front-back direction. There is.
  • the front surface of the circuit board 40 is formed as a light source mounting surface 41, and the back surface is brought into contact with the board mounting surface 34 of the base portion 31 via heat dissipation grease. Thereby, the heat generated when the light sources 42 and 43 are driven is transmitted to the heat sink 30, and is radiated to the outside from the rear radiation fins 32 and the front radiation fins 33.
  • Light sources 42 and 43 are mounted on the light source mounting surface 41 of the circuit board 40.
  • the light sources 42 and 43 for example, light emitting diodes (LEDs) are used.
  • the light sources 42 and 43 are divided into two stages, upper and lower, and a plurality of light sources are arranged on the left and right, respectively.
  • the light sources 42 arranged on the upper side are for example low beams, and the light sources 43 arranged on the lower side are for example for high beams.
  • variable light distribution control is performed in which the light sources 42 and 43 are turned on and off individually depending on the driving condition of the vehicle, the surrounding environment, etc. It is designed to prevent dazzling light from occurring.
  • a flexible board 44 is arranged on the light source mounting surface 41 of the circuit board 40.
  • a conductive wiring pattern 45 is formed on the flexible substrate 44 .
  • the wiring pattern 45 is connected to the light sources 42 and 43 via a metal wire 46.
  • the metal wire 46 is a member for connecting the terminals provided on the light sources 42 and 43 and the wiring pattern 45 of the flexible substrate 44, and is a metal conductive member that can be realized using a known wire bonding technique.
  • Through holes 47 and 48 are formed in the circuit board 40 at positions facing the positioning pins 35 and screw grooves 36 of the heat sink 30, respectively.
  • the primary lens 50 is made of silicone resin for optical molding.
  • the primary lens 50 has a substantially rectangular shape that is long in the left-right direction and short in the up-down direction in a plane perpendicular to the front-back direction, and is formed into a thin flat plate shape in the front-back direction.
  • the primary lens 50 has lens portions 51 and 52 formed at positions facing the light sources 42 and 43 mounted on the circuit board 40, respectively.
  • the lens parts 51 and 52 converge the light emitted from the light sources 42 and 43 and guide it forward.
  • a through hole 53 is formed in the primary lens 50 at a position facing the positioning pin 35 of the heat sink 30 and the through hole 47 of the circuit board 40.
  • FIG. 4A is a front view of the reflector 60.
  • FIG. 4B is a side view of reflector 60.
  • FIG. 4C is a rear perspective view of reflector 60.
  • the reflector 60 includes a base portion 61, a reflective protrusion 62, and a radiation fin 63 that are integrally formed.
  • the reflector 60 is formed by die-casting from a metal material such as aluminum having high thermal conductivity.
  • the base portion 61 has a substantially rectangular shape that is long in the left-right direction and short in the up-down direction in a plane perpendicular to the front-back direction, and is formed into a thin flat plate shape in the front-back direction.
  • a pair of reflective protrusions 62 are formed on the front surface of the base portion 61 so as to protrude in the front direction and are spaced apart from each other in the left-right direction.
  • the opposing surfaces of the reflecting protrusions 62 are each formed as a side reflecting surface 62a.
  • the base portion 61 has openings 64 and 65 that are long in the left-right direction and short in the vertical direction, between the pair of reflective protrusions 62 and at positions facing the lens portions 51 and 52 of the primary lens 50. each formed.
  • the openings 64 and 65 are formed apart from each other in the vertical direction, and a reflective section 66 is formed between them.
  • the reflective portion 66 has a substantially triangular cross section with a sharp point in the front direction, and the inclined surface on the opening 64 side is formed as a reflective surface 66a, and the inclined surface on the opening 65 side is formed as a reflective surface 66b. has been done.
  • the light emitted from the light source 42 and condensed by the lens section 51 passes through the opening 64, is partially reflected by the side reflecting surface 62a and the reflecting surface 66a, and is guided to the lens body section 21 of the projection lens 20. It will be destroyed. Further, the light emitted from the light source 43 and collected by the lens section 52 passes through the opening 65, is partially reflected by the reflective surface 66b, and is guided to the lens body section 21 of the projection lens 20.
  • a through hole 67 is formed in the reflector 60 at a position facing the positioning pin 35 of the heat sink 30, the through hole 47 of the circuit board 40, and the through hole 53 of the primary lens 50. Therefore, by sequentially inserting the through hole 47 of the circuit board 40, the through hole 53 of the primary lens 50, and the through hole 67 of the reflector 60 into the positioning pin 35 of the heat sink 30, the heat sink 30, the circuit board 40, the primary lens 50 And the reflector 60 is positioned.
  • a through hole 68 is formed in the reflector 60 at a position facing the screw groove 36 of the heat sink 30 and the through hole 48 of the circuit board 40.
  • the heat dissipation fin 63 has a flat plate shape that is long in the vertical and front-back directions and thin in the left-right direction, and is formed to protrude forward from the base portion 61. That is, the radiation fins 63 are formed to have a rectangular cross section that is long in the vertical direction and sufficiently short in the horizontal direction in a plane perpendicular to the front-rear direction.
  • the radiation fins 63 are formed outside the reflective protrusion 62 and the openings 64 and 65.
  • the radiation fins 63 that overlap the openings 64 and 65 in the vertical direction are formed separately in the vertical direction with the openings 64 and 65 in between.
  • FIG. 5A is a front view of the lamp unit 6.
  • FIG. 5B is a top view of the lamp unit 6.
  • FIG. 5C is a side view of the lamp unit 6. Note that the lens holder 10 and the projection lens 20 are omitted in FIGS. 5A, 5B, and 5C.
  • the radiation fins 63 are arranged at the same position (interval) as the front radiation fins 33 of the heat sink 30 in the left-right direction. Therefore, the heat radiation fins 63 and the front heat radiation fins 33 are arranged in a straight line in the vertical direction. Thereby, when the air warmed by the front radiation fins 33 and the radiation fins 63 moves upward, it is possible to prevent the path from being blocked by the front radiation fins 33 and the radiation fins 63. .
  • the heat radiation fins 63 are formed to have a shorter length in the front-rear direction than the front heat radiation fins 33 that are arranged side by side in the vertical direction. Thereby, it is possible to prevent the light passing through the openings 64 and 65 from hitting the radiation fins 63.
  • the radiation fins 63 are formed to have a shorter length in the front-rear direction than the reflective protrusions 62.
  • the front heat dissipation fins 33 of the heat sink 30 are also formed to have a shorter length in the front-rear direction than the reflective protrusions 62.
  • the vehicular lamp 1 includes a circuit board 40 on which the light sources 42 and 43 are mounted, and a circuit board 40 that is attached to the side in which light is emitted from the light sources 42 and 43. 43, and a reflector 60 to which the circuit board 40 is attached on the side opposite to the emission direction and reflects the light emitted from the light sources 42 and 43. , radiation fins 63 protruding in the radiation direction are formed.
  • the heat emitted from the light sources 42 and 43 is released from the heat sink 30 and also from the heat radiation fins 63 of the reflector 60.
  • the vehicle lamp 1 can be made smaller as a whole by making the rear radiation fins 32 of the heat sink 30 shorter, for example, by the amount of heat released from the radiation fins 63 of the reflector 60.
  • the vehicular lamp 1 can be made smaller and improve the heat dissipation performance of the light sources 42 and 43.
  • the vehicle lamp 1 can increase the current value applied to the light sources 42 and 43 by the amount of heat released from the radiation fins 63 of the reflector 60, thereby making it possible for the light sources 42 and 43 to emit bright light.
  • the reflector 60 includes openings 64 and 65 that are formed at positions facing the light sources 42 and 43 and allow the light emitted from the light sources 42 and 43 to pass through, and the radiation fins 63 are arranged in the vertical direction of the openings 64 and 65. are formed respectively. Specifically, the radiation fins 63 are formed to sandwich the openings 64 and 65 in the vertical direction, and are formed to sandwich the openings 64 and 65 in the horizontal direction.
  • the heat sink 30 includes a front heat dissipation fin 33 that protrudes in the radiation direction, and the heat dissipation fin 63 is arranged in line with the front heat dissipation fin 33 in the vertical direction.
  • the front radiation fin 33 is formed to surround the reflector 60, and the radiation fin 63 has a shorter length in the emission direction than the front radiation fin 33. Since the radiation fin 63 is closer to the openings 64 and 65 than the front radiation fin 33, it is likely to affect the light distribution of the light emitted from the light sources 42 and 43 and passed through the openings 64 and 65. Therefore, by making the length of the radiation fin 63 in the emission direction shorter than that of the front radiation fin 33, it is possible to make it difficult for the light that has passed through the openings 64 and 65 to hit the radiation fin 63. Thereby, in the vehicle lamp 1, it is possible to improve heat dissipation performance without interfering with light distribution.
  • the reflector 60 includes a reflective protrusion 62 that projects in the emission direction and reflects the light emitted from the light sources 42 and 43, and the radiation fins 63 are formed outside the reflective protrusion 62. This makes it possible to prevent the light emitted from the light sources 42 and 43 and passing through the openings 64 and 65 from hitting the radiation fins 63 before being guided to the reflecting protrusion 62. Therefore, the vehicle lamp 1 can improve heat dissipation performance without interfering with light distribution.
  • the vehicle lamp 1 is a vehicle headlamp, but the vehicle lamp 1 may be a vehicle lamp other than a vehicle headlamp, and the vehicle lamp 1 may be a vehicle lamp other than a vehicle headlamp. In addition to emitting light toward the front of the vehicle, it may also be a vehicle lamp that emits light toward the rear of the vehicle.
  • vehicle lamp 1 is configured to radiate heat through air convection, heat may be radiated by forcibly applying air using a fan or the like.
  • Vehicle lamp 30... Heat sink, 32... Rear heat sink, 33... Front heat sink, 40... Circuit board, 60... Reflector, 62... Reflective protrusion, 63... Heat sink, 64, 65... Opening

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

This vehicle lamp comprises: a circuit board on which a light source is mounted; a heat sink that releases heat generated when the light source is driven and that has the circuit board attached thereto on a side in an emission direction in which light is emitted from the light source; and a reflector that has the circuit board attached thereto on a side in the opposite direction of the emission direction and that reflects light emitted from the light source. Heat dissipation fins protruding in the emission direction are formed on the reflector.

Description

車輌用灯具Vehicle lights
　本発明は、光源の駆動時に発生する熱を放出するヒートシンクと、光源から出射される光を反射するリフレクターとを備えた車輌用灯具についての技術分野に関する。 The present invention relates to the technical field of a vehicular lamp equipped with a heat sink that emits heat generated when a light source is driven and a reflector that reflects light emitted from the light source.
　車輌用灯具は、例えば、光源が搭載された回路基板と、前面に回路基板が取り付けられ光源の駆動時に発生する熱を放出するヒートシンクと、回路基板の前面に取り付けられ光源から出射される光を反射するリフレクターとを備える（例えば、特許文献１参照） For example, a vehicle lamp includes a circuit board on which a light source is mounted, a heat sink that is attached to the front of the circuit board and emits the heat generated when the light source is driven, and a heat sink that is attached to the front of the circuit board and emits the light emitted from the light source. (For example, see Patent Document 1)
　特許文献１に記載された車輌用灯具においては、ヒートシンクの背面に放熱フィンが複数形成されており、光源の駆動時に発生する熱が放熱フィンを介して放熱される。 In the vehicle lamp described in Patent Document 1, a plurality of radiation fins are formed on the back surface of the heat sink, and heat generated when the light source is driven is radiated through the radiation fins.
特開２０１９－４６７１３号公報JP 2019-46713 Publication
　ところで、特許文献１に記載された車輌用灯具においては、ヒートシンクの背面にしか放熱フィンが形成されていないため、放熱性能が低いおそれがある。そこで、放熱性能のさらなる向上が望まれている。 By the way, in the vehicle lamp described in Patent Document 1, since the heat radiation fins are formed only on the back surface of the heat sink, the heat radiation performance may be low. Therefore, further improvement in heat dissipation performance is desired.
　そこで、本発明車輌用灯具は、放熱性能の向上を図ることを目的とする。 Therefore, the vehicle lamp of the present invention aims to improve heat dissipation performance.
　本発明に係る車輌用灯具は、光源が搭載された回路基板と、前記光源から光が出射される出射方向側に前記回路基板が取り付けられ前記光源の駆動時に発生する熱を放出するヒートシンクと、前記出射方向とは反対方向側に前記回路基板が取り付けられ前記光源から出射される光を反射するリフレクターと、を備え、前記リフレクターは、前記出射方向に突出した放熱フィンが形成される。 A vehicular lamp according to the present invention includes: a circuit board on which a light source is mounted; a heat sink to which the circuit board is attached on the side in which light is emitted from the light source and which releases heat generated when the light source is driven; The reflector includes a reflector to which the circuit board is attached on a side opposite to the emission direction and reflects the light emitted from the light source, and the reflector is formed with radiation fins protruding in the emission direction.
　本発明によれば、放熱性能の向上を図ることができる。 According to the present invention, it is possible to improve heat dissipation performance.
車輌用灯具の断面図である。FIG. 2 is a cross-sectional view of the vehicle lamp. ランプユニットの分解斜視図である。FIG. 3 is an exploded perspective view of the lamp unit. 図３Ａは、ヒートシンクの正面図である。図３Ｂは、ヒートシンクの側面図である。FIG. 3A is a front view of the heat sink. FIG. 3B is a side view of the heat sink. 図４Ａは、リフレクターの正面図である。図４Ｂは、リフレクターの側面図である。図４Ｃは、リフレクターの後方斜視図である。FIG. 4A is a front view of the reflector. FIG. 4B is a side view of the reflector. FIG. 4C is a rear perspective view of the reflector. 図５Ａは、ランプユニットの正面図である。図５Ｂは、ランプユニットの上面図である。図５Ｃは、ランプユニットの側面図である。FIG. 5A is a front view of the lamp unit. FIG. 5B is a top view of the lamp unit. FIG. 5C is a side view of the lamp unit.
　以下に、本実施形態の車輌用灯具を実施するための形態について添付図面を参照して説明する。なお、光の出射方向を前方向、光の出射方向とは反対方向を後方向、前方向に対して右を向く方向を右方向、前方向に対して左を向く方向を左方向、前後方向及び左右方向に直交し上を向く方向を上方向、前後方向及び左右方向に直交し下を向く方向を下方向として説明する。 Below, modes for implementing the vehicle lamp of this embodiment will be described with reference to the accompanying drawings. In addition, the direction in which the light is emitted is the front, the direction opposite to the direction in which the light is emitted is the rear, the direction facing right with respect to the front is the right direction, the direction facing left with respect to the front is the left direction, and the front-rear direction. A direction perpendicular to the left-right direction and facing upward will be referred to as an upward direction, and a direction perpendicular to the front-rear direction and the left-right direction and facing downward will be referred to as a downward direction.
　図１は、車輌用灯具１の断面図である。図２は、ランプユニット６の分解斜視図である。
　車輌用灯具１は、例えば、車輌用前照灯であり、車体の前端部における左右両端部に取り付けられて配置されている。 FIG. 1 is a sectional view of a vehicle lamp 1. As shown in FIG. FIG. 2 is an exploded perspective view of the lamp unit 6.
The vehicular lamp 1 is, for example, a vehicular headlamp, and is attached to both left and right ends of the front end of the vehicle body.
　図１に示すように、車輌用灯具１は、前端に開口を有するランプハウジング２と、ランプハウジング２の開口を閉塞するカバー３とを備えている。ランプハウジング２とカバー３によって灯具外筐４が構成され、灯具外筐４の内部空間が灯室５として形成されている。灯室５にはランプユニット６が配置されている。 As shown in FIG. 1, the vehicular lamp 1 includes a lamp housing 2 having an opening at the front end, and a cover 3 that closes the opening of the lamp housing 2. The lamp housing 2 and the cover 3 constitute a lamp outer casing 4, and an internal space of the lamp outer casing 4 is formed as a lamp chamber 5. A lamp unit 6 is arranged in the lamp chamber 5.
　図１及び図２に示すように、ランプユニット６は、レンズホルダー１０、投影レンズ２０、ヒートシンク３０、回路基板４０、プライマリレンズ５０及びリフレクター６０を備えている。 As shown in FIGS. 1 and 2, the lamp unit 6 includes a lens holder 10, a projection lens 20, a heat sink 30, a circuit board 40, a primary lens 50, and a reflector 60.
　ランプユニット６は、ランプハウジング２に図示しない光軸調整機構を介して支持されている。従って、光軸調整機構を動作させることによりランプユニット６をランプハウジング２に対して上下方向又は左右方向へ傾動させて光の光軸調整（エイミング調整又はレベリング調整）を行うことが可能にされている。 The lamp unit 6 is supported by the lamp housing 2 via an optical axis adjustment mechanism (not shown). Therefore, by operating the optical axis adjustment mechanism, it is possible to tilt the lamp unit 6 vertically or horizontally with respect to the lamp housing 2 to adjust the optical axis of the light (aiming adjustment or leveling adjustment). There is.
　レンズホルダー１０は、軸方向が前後方向に沿って配置された略円筒状の保持筒部１１と、保持筒部１１からそれぞれ後方に突出された脚部１２とを有している。保持筒部１１の前面１３には、前方向に突出した位置決めピン１４が形成されている。 The lens holder 10 has a substantially cylindrical holding cylinder part 11 whose axial direction is arranged along the front-rear direction, and leg parts 12 that respectively protrude rearward from the holding cylinder part 11. A positioning pin 14 is formed on the front surface 13 of the holding cylinder portion 11 and projects forward.
　投影レンズ２０は、レンズホルダー１０の保持筒部１１に保持されている。投影レンズ２０は、光が透過されるレンズ本体部２１と、レンズ本体部２１の後端部から外方に張り出されたフランジ状の被取付部２２とが一体に形成されている。 The projection lens 20 is held in the holding cylinder part 11 of the lens holder 10. The projection lens 20 is integrally formed with a lens body 21 through which light is transmitted, and a flange-shaped attached portion 22 extending outward from the rear end of the lens body 21.
　被取付部２２には、レンズホルダー１０の位置決めピン１４と対向する位置に貫通孔２３が形成されている。投影レンズ２０は、貫通孔２３に位置決めピン１４が挿入された状態で、被取付部２２が保持筒部１１に取り付けられてレンズホルダー１０に保持される。 A through hole 23 is formed in the attached portion 22 at a position facing the positioning pin 14 of the lens holder 10. The projection lens 20 is held by the lens holder 10 with the attached portion 22 attached to the holding cylinder portion 11 with the positioning pin 14 inserted into the through hole 23 .
　投影レンズ２０は、例えば、アクリルによって射出成形により形成されている。アクリルはポリカーボネイトとともに射出成形により樹脂部品を成形するための好適な材料であり、ポリカーボネイトより透明度の高い良好な成形性を有する材料であるが、ポリカーボネイトより耐熱性は低いことが知られている。 The projection lens 20 is formed of, for example, acrylic by injection molding. Acrylic is a suitable material for molding resin parts by injection molding together with polycarbonate, and is a material that has higher transparency and good moldability than polycarbonate, but is known to have lower heat resistance than polycarbonate.
　このような理由により、投影レンズ２０は、被取付部２２の下端部がゲート位置になる状態でレンズホルダー１０に保持されている。残留歪みが残存するおそれのあるゲート位置を最も下側に位置させることにより、ゲート位置が上方に位置される場合に比し残留歪みが残存するおそれのある部分が熱の影響を受け難くなり、ゲート位置がある部分の変形を抑制することが可能にされている。 For this reason, the projection lens 20 is held in the lens holder 10 with the lower end of the attached portion 22 at the gate position. By locating the gate position where residual strain may remain at the lowest position, the part where residual strain may remain is less susceptible to the effects of heat than when the gate position is located upward. It is possible to suppress deformation of a portion where the gate is located.
　図３Ａは、ヒートシンク３０の正面図である。図３Ｂは、ヒートシンク３０の側面図である。図２、図３Ａ及び図３Ｂに示すように、ヒートシンク３０は、ベース部３１、後方放熱フィン３２及び前方放熱フィン３３が熱伝導性の高い金属材料によって一体に形成されている。 FIG. 3A is a front view of the heat sink 30. FIG. 3B is a side view of the heat sink 30. As shown in FIGS. 2, 3A, and 3B, the heat sink 30 includes a base portion 31, rear radiation fins 32, and front radiation fins 33 that are integrally formed of a metal material with high thermal conductivity.
　ベース部３１は、前後方向に直交する平面（上下方向及び左右方向に広がる平面）において左右方向に長く上下方向に短い略長方形状であって、前後方向に薄い平板状に形成されている。ベース部３１の後方側の背面には、複数の後方放熱フィン３２が取り付けられている。複数の後方放熱フィン３２は、左右方向に等間隔に離隔して配置されている。 The base portion 31 has a substantially rectangular shape that is longer in the left-right direction and shorter in the up-down direction on a plane perpendicular to the front-rear direction (a plane extending in the up-down direction and the left-right direction), and is formed into a thin flat plate shape in the front-back direction. A plurality of rear radiation fins 32 are attached to the rear surface of the base portion 31 on the rear side. The plurality of rear radiation fins 32 are arranged at equal intervals in the left-right direction.
　後方放熱フィン３２は、上下方向及び前後方向に長く左右方向に薄い平板状であって、ベース部３１から後方向に突出するように形成されている。すなわち、後方放熱フィン３２は、前後方向に直交する平面において、上下方向にベース部３１と同程度の長さでかつ左右方向に十分に短い矩形状の断面に形成されている。なお、複数の後方放熱フィン３２のうち、左右方向における両端から２個ずつの後方放熱フィン３２は、上下方向の長さが他の後方放熱フィン３２よりも短く形成されている。 The rear heat dissipation fin 32 has a flat plate shape that is long in the vertical and front-back directions and thin in the left-right direction, and is formed to protrude rearward from the base portion 31. That is, the rear radiation fins 32 are formed in a rectangular cross section that is approximately the same length as the base portion 31 in the vertical direction and sufficiently short in the horizontal direction in a plane perpendicular to the front-rear direction. In addition, among the plurality of rear heat dissipation fins 32, two rear heat dissipation fins 32 from both ends in the left-right direction are formed to have shorter lengths in the vertical direction than the other rear heat dissipation fins 32.
　ベース部３１の前面中央には、左右方向に長く上下方向に短い略長方形状の基板取付面３４が形成されている。また、ベース部３１の前面における基板取付面３４の周囲には前方放熱フィン３３が取り付けられている。すなわち、前方放熱フィン３３は、リフレクター６０を囲むように配置されている。 A substantially rectangular board mounting surface 34 that is long in the left-right direction and short in the vertical direction is formed at the center of the front surface of the base portion 31. Furthermore, front heat dissipation fins 33 are attached around the board mounting surface 34 on the front surface of the base portion 31 . That is, the front heat radiation fins 33 are arranged so as to surround the reflector 60.
　前方放熱フィン３３は、左右方向に後方放熱フィン３２と同じ間隔で配置されている。前方放熱フィン３３は、上下方向及び前後方向に長く左右方向に薄い平板状であって、ベース部３１から前方向に突出するように形成されている。換言すると、前方放熱フィン３３は、前後方向に直交する平面において、上下方向に長く左右方向に十分に短い矩形状の断面に形成されている。 The front radiation fins 33 are arranged at the same intervals as the rear radiation fins 32 in the left-right direction. The front heat radiation fin 33 has a flat plate shape that is long in the vertical direction and the front-back direction and thin in the left-right direction, and is formed so as to protrude from the base portion 31 in the front direction. In other words, the front radiation fins 33 are formed in a rectangular cross section that is long in the vertical direction and sufficiently short in the horizontal direction in a plane perpendicular to the front-rear direction.
　複数の前方放熱フィン３３のうち、上下方向において基板取付面３４と重なる前方放熱フィン３３は、基板取付面３４を挟んで上下に分かれて配置されている。
　また、前方放熱フィン３３のうち、左右方向における両端から２個ずつの前方放熱フィン３３は、上下方向の長さが他の前方放熱フィン３３よりも短く形成されている。
　また、前方放熱フィン３３のうち、左右方向における中央の６個の前方放熱フィン３３は、前後方向の長さが他の前方放熱フィン３３よりも長く形成されている。 Among the plurality of front heat dissipation fins 33, the front heat dissipation fins 33 that overlap the board mounting surface 34 in the vertical direction are vertically arranged with the board mounting surface 34 in between.
Furthermore, among the front heat dissipation fins 33 , two front heat dissipation fins 33 from both ends in the left-right direction are formed to have shorter vertical lengths than the other front heat dissipation fins 33 .
Furthermore, among the front heat dissipation fins 33, the six front heat dissipation fins 33 at the center in the left-right direction are formed to have longer lengths in the front-rear direction than the other front heat dissipation fins 33.
　基板取付面３４には、前方に突出した位置決めピン３５、及び、リフレクター６０が締結されるためのネジ溝３６がそれぞれ２個ずつ形成されている。 Two positioning pins 35 protruding forward and two screw grooves 36 to which the reflector 60 is fastened are formed on the board mounting surface 34.
　また、ベース部３１の前面には、基板取付面３４の左右両側に、レンズホルダー１０が締結されるためのネジ溝３７が２個形成されている。そして、レンズホルダー１０の脚部１２に形成された貫通孔１５に挿入されたボルトがヒートシンク３０のネジ溝３７に螺合されることでレンズホルダー１０がヒートシンク３０に固定される。 Furthermore, two screw grooves 37 for fastening the lens holder 10 are formed on the front surface of the base portion 31 on both left and right sides of the board mounting surface 34. Then, the lens holder 10 is fixed to the heat sink 30 by screwing the bolt inserted into the through hole 15 formed in the leg portion 12 of the lens holder 10 into the thread groove 37 of the heat sink 30.
　回路基板４０は、熱伝導性の高い銅等の金属材料によって形成されている。回路基板４０は、前後方向に直交する平面において基板取付面３４と略同一の大きさ、すなわち、左右方向に長く上下方向に短い略長方形状であって、前後方向に薄い平板状に形成されている。 The circuit board 40 is made of a metal material such as copper that has high thermal conductivity. The circuit board 40 has approximately the same size as the board mounting surface 34 in a plane perpendicular to the front-back direction, that is, it has a substantially rectangular shape that is long in the left-right direction and short in the up-down direction, and is formed into a thin flat plate shape in the front-back direction. There is.
　回路基板４０は、前面が光源搭載面４１として形成され、背面がベース部３１の基板取付面３４に放熱グリスを介して当接される。これにより、光源４２、４３の駆動時において発生する熱がヒートシンク３０に伝わり、後方放熱フィン３２及び前方放熱フィン３３から外部に放熱されることになる。 The front surface of the circuit board 40 is formed as a light source mounting surface 41, and the back surface is brought into contact with the board mounting surface 34 of the base portion 31 via heat dissipation grease. Thereby, the heat generated when the light sources 42 and 43 are driven is transmitted to the heat sink 30, and is radiated to the outside from the rear radiation fins 32 and the front radiation fins 33.
　回路基板４０の光源搭載面４１には光源４２、４３が搭載されている。光源４２、４３としては、例えば、発光ダイオード（ＬＥＤ：Light Emitting Diode）が用いられている。光源４２、４３は、上下２段に分かれて、それぞれ複数が左右に配列されている。上側に配列された光源４２は、例えばロービーム用であり、下側に配列された光源４３は、例えばハイビーム用である。 Light sources 42 and 43 are mounted on the light source mounting surface 41 of the circuit board 40. As the light sources 42 and 43, for example, light emitting diodes (LEDs) are used. The light sources 42 and 43 are divided into two stages, upper and lower, and a plurality of light sources are arranged on the left and right, respectively. The light sources 42 arranged on the upper side are for example low beams, and the light sources 43 arranged on the lower side are for example for high beams.
　なお、車輌用灯具１においては、車輌の走行状態や周囲の環境等によって光源４２、４３が各別に点消灯される配光可変制御が行われ、対向車や先行車における運転者や歩行者等に幻惑光が生じないようにされている。 In addition, in the vehicle lamp 1, variable light distribution control is performed in which the light sources 42 and 43 are turned on and off individually depending on the driving condition of the vehicle, the surrounding environment, etc. It is designed to prevent dazzling light from occurring.
　また、回路基板４０の光源搭載面４１には、フレキシブル基板４４が配置されている。フレキシブル基板４４には、導電性の配線パターン４５が形成されている。配線パターン４５は、金属ワイヤ４６を介して光源４２、４３に接続されている。 Furthermore, a flexible board 44 is arranged on the light source mounting surface 41 of the circuit board 40. A conductive wiring pattern 45 is formed on the flexible substrate 44 . The wiring pattern 45 is connected to the light sources 42 and 43 via a metal wire 46.
　金属ワイヤ４６は、光源４２、４３に設けられた端子とフレキシブル基板４４の配線パターン４５とを接続するための部材であり、公知のワイヤボンディング技術で実現できる金属製の導電性部材である。 The metal wire 46 is a member for connecting the terminals provided on the light sources 42 and 43 and the wiring pattern 45 of the flexible substrate 44, and is a metal conductive member that can be realized using a known wire bonding technique.
　回路基板４０には、ヒートシンク３０の位置決めピン３５及びネジ溝３６と対向する位置に貫通孔４７、４８がそれぞれ形成されている。 Through holes 47 and 48 are formed in the circuit board 40 at positions facing the positioning pins 35 and screw grooves 36 of the heat sink 30, respectively.
　プライマリレンズ５０は、光学成形用シリコーン樹脂によって形成されている。プライマリレンズ５０は、前後方向に直交する平面において左右方向に長く上下方向に短い略長方形状であって、前後方向に薄い平板状に形成されている。 The primary lens 50 is made of silicone resin for optical molding. The primary lens 50 has a substantially rectangular shape that is long in the left-right direction and short in the up-down direction in a plane perpendicular to the front-back direction, and is formed into a thin flat plate shape in the front-back direction.
　プライマリレンズ５０は、回路基板４０に搭載された光源４２、４３と対向する位置にレンズ部５１、５２がそれぞれ形成されている。レンズ部５１、５２は、光源４２、４３から出射された光を収束させて前方向に導く。 The primary lens 50 has lens portions 51 and 52 formed at positions facing the light sources 42 and 43 mounted on the circuit board 40, respectively. The lens parts 51 and 52 converge the light emitted from the light sources 42 and 43 and guide it forward.
　また、プライマリレンズ５０には、ヒートシンク３０の位置決めピン３５、回路基板４０の貫通孔４７と対向する位置に貫通孔５３が形成されている。 Furthermore, a through hole 53 is formed in the primary lens 50 at a position facing the positioning pin 35 of the heat sink 30 and the through hole 47 of the circuit board 40.
　図４Ａは、リフレクター６０の正面図である。図４Ｂは、リフレクター６０の側面図である。図４Ｃは、リフレクター６０の後方斜視図である。図２、図４Ａ、図４Ｂ及び図４Ｃに示すように、リフレクター６０は、ベース部６１、反射用突部６２及び放熱フィン６３が一体形成されている。リフレクター６０は、熱伝導性の高いアルミニウム等の金属材料によってダイカスト形成されている。 FIG. 4A is a front view of the reflector 60. FIG. 4B is a side view of reflector 60. FIG. 4C is a rear perspective view of reflector 60. As shown in FIGS. 2, 4A, 4B, and 4C, the reflector 60 includes a base portion 61, a reflective protrusion 62, and a radiation fin 63 that are integrally formed. The reflector 60 is formed by die-casting from a metal material such as aluminum having high thermal conductivity.
　ベース部６１は、前後方向に直交する平面において左右方向に長く上下方向に短い略長方形状であって、前後方向に薄い平板状に形成されている。 The base portion 61 has a substantially rectangular shape that is long in the left-right direction and short in the up-down direction in a plane perpendicular to the front-back direction, and is formed into a thin flat plate shape in the front-back direction.
　ベース部６１の前面には、左右方向に離隔して配置される一対の反射用突部６２が前方向に突出するように形成されている。反射用突部６２の対向する面はそれぞれ側方反射面６２ａとして形成されている。 A pair of reflective protrusions 62 are formed on the front surface of the base portion 61 so as to protrude in the front direction and are spaced apart from each other in the left-right direction. The opposing surfaces of the reflecting protrusions 62 are each formed as a side reflecting surface 62a.
　また、ベース部６１には、一対の反射用突部６２の間であって、プライマリレンズ５０のレンズ部５１、５２と対向する位置に、左右方向に長く上下方向に短い開口部６４、６５がそれぞれ形成されている。開口部６４、６５は、上下方向に離隔して形成されており、その間に反射部６６が形成されている。 Furthermore, the base portion 61 has openings 64 and 65 that are long in the left-right direction and short in the vertical direction, between the pair of reflective protrusions 62 and at positions facing the lens portions 51 and 52 of the primary lens 50. each formed. The openings 64 and 65 are formed apart from each other in the vertical direction, and a reflective section 66 is formed between them.
　反射部６６は、断面が前方向に尖った略三角形に形成されており、開口部６４側の傾斜面が反射面６６ａとして形成されるとともに、開口部６５側の傾斜面が反射面６６ｂとして形成されている。 The reflective portion 66 has a substantially triangular cross section with a sharp point in the front direction, and the inclined surface on the opening 64 side is formed as a reflective surface 66a, and the inclined surface on the opening 65 side is formed as a reflective surface 66b. has been done.
　光源４２から出射されレンズ部５１で集光された光は、開口部６４を通過した後、側方反射面６２ａ及び反射面６６ａによって一部が反射され、投影レンズ２０のレンズ本体部２１に導かれる。
　また、光源４３から出射されレンズ部５２で集光された光は、開口部６５を通過した後、反射面６６ｂによって一部が反射され、投影レンズ２０のレンズ本体部２１に導かれる。 The light emitted from the light source 42 and condensed by the lens section 51 passes through the opening 64, is partially reflected by the side reflecting surface 62a and the reflecting surface 66a, and is guided to the lens body section 21 of the projection lens 20. It will be destroyed.
Further, the light emitted from the light source 43 and collected by the lens section 52 passes through the opening 65, is partially reflected by the reflective surface 66b, and is guided to the lens body section 21 of the projection lens 20.
　リフレクター６０には、ヒートシンク３０の位置決めピン３５、回路基板４０の貫通孔４７、プライマリレンズ５０の貫通孔５３と対向する位置に貫通孔６７が形成されている。
　従って、ヒートシンク３０の位置決めピン３５に、回路基板４０の貫通孔４７、プライマリレンズ５０の貫通孔５３及びリフレクター６０の貫通孔６７が順に挿入されることで、ヒートシンク３０、回路基板４０、プライマリレンズ５０及びリフレクター６０の位置決めがなされる。 A through hole 67 is formed in the reflector 60 at a position facing the positioning pin 35 of the heat sink 30, the through hole 47 of the circuit board 40, and the through hole 53 of the primary lens 50.
Therefore, by sequentially inserting the through hole 47 of the circuit board 40, the through hole 53 of the primary lens 50, and the through hole 67 of the reflector 60 into the positioning pin 35 of the heat sink 30, the heat sink 30, the circuit board 40, the primary lens 50 And the reflector 60 is positioned.
　また、リフレクター６０には、ヒートシンク３０のネジ溝３６、回路基板４０の貫通孔４８と対向する位置に貫通孔６８が形成されている。 Further, a through hole 68 is formed in the reflector 60 at a position facing the screw groove 36 of the heat sink 30 and the through hole 48 of the circuit board 40.
　そして、リフレクター６０の貫通孔６８、回路基板４０の貫通孔４８に挿入されたボルトがヒートシンク３０のネジ溝３６に螺合されることで所謂共締めされ、ヒートシンク３０及びリフレクター６０の間に回路基板４０、プライマリレンズ５０が挟持されることになる。このとき、リフレクター６０の背面における左右方向の両端部である当接面６９が回路基板４０の光源搭載面４１（前面）に当接することになる。これにより、光源４２、４３の駆動時において発生する熱がリフレクター６０に伝わり、放熱フィン６３から外部に放熱されることになる。 Then, the bolts inserted into the through holes 68 of the reflector 60 and the through holes 48 of the circuit board 40 are screwed into the thread grooves 36 of the heat sink 30, so that they are tightened together, and the circuit board is inserted between the heat sink 30 and the reflector 60. 40, the primary lens 50 will be held. At this time, contact surfaces 69, which are both ends in the left and right direction on the back surface of the reflector 60, come into contact with the light source mounting surface 41 (front surface) of the circuit board 40. Thereby, the heat generated when the light sources 42 and 43 are driven is transmitted to the reflector 60 and is radiated to the outside from the heat radiation fins 63.
　放熱フィン６３は、上下方向及び前後方向に長く左右方向に薄い平板状であって、ベース部６１から前方向に突出するように形成されている。すなわち、放熱フィン６３は、前後方向に直交する平面において、上下方向に長く左右方向に十分に短い矩形状の断面に形成されている。 The heat dissipation fin 63 has a flat plate shape that is long in the vertical and front-back directions and thin in the left-right direction, and is formed to protrude forward from the base portion 61. That is, the radiation fins 63 are formed to have a rectangular cross section that is long in the vertical direction and sufficiently short in the horizontal direction in a plane perpendicular to the front-rear direction.
　放熱フィン６３は、反射用突部６２及び開口部６４、６５の外側に形成されている。例えば、複数の放熱フィン６３のうち、上下方向において開口部６４、６５と重なる放熱フィン６３は、開口部６４、６５を挟んで上下方向に分かれてそれぞれ形成されている。 The radiation fins 63 are formed outside the reflective protrusion 62 and the openings 64 and 65. For example, among the plurality of radiation fins 63, the radiation fins 63 that overlap the openings 64 and 65 in the vertical direction are formed separately in the vertical direction with the openings 64 and 65 in between.
　図５Ａは、ランプユニット６の正面図である。図５Ｂは、ランプユニット６の上面図である。図５Ｃは、ランプユニット６の側面図である。なお、図５Ａ、図５Ｂ及び図５Ｃでは、レンズホルダー１０及び投影レンズ２０を省略している。 FIG. 5A is a front view of the lamp unit 6. FIG. 5B is a top view of the lamp unit 6. FIG. 5C is a side view of the lamp unit 6. Note that the lens holder 10 and the projection lens 20 are omitted in FIGS. 5A, 5B, and 5C.
　図５Ａ、図５Ｂ及び図５Ｃに示すように、放熱フィン６３は、左右方向にヒートシンク３０の前方放熱フィン３３と同じ位置（間隔）に配置されている。従って、放熱フィン６３及び前方放熱フィン３３は、上下方向に一直線に並んで配置されている。これにより、前方放熱フィン３３及び放熱フィン６３によって温められた空気が上方向に移動する際に、前方放熱フィン３３及び放熱フィン６３によって経路が塞がれてしまうことを防止することが可能となる。 As shown in FIGS. 5A, 5B, and 5C, the radiation fins 63 are arranged at the same position (interval) as the front radiation fins 33 of the heat sink 30 in the left-right direction. Therefore, the heat radiation fins 63 and the front heat radiation fins 33 are arranged in a straight line in the vertical direction. Thereby, when the air warmed by the front radiation fins 33 and the radiation fins 63 moves upward, it is possible to prevent the path from being blocked by the front radiation fins 33 and the radiation fins 63. .
　また、放熱フィン６３は、上下方向に並んで配置される前方放熱フィン３３と比べ、前後方向の長さが短く形成されている。これにより、開口部６４、６５を通過した光が放熱フィン６３に当たってしまうことを回避することが可能である。 Furthermore, the heat radiation fins 63 are formed to have a shorter length in the front-rear direction than the front heat radiation fins 33 that are arranged side by side in the vertical direction. Thereby, it is possible to prevent the light passing through the openings 64 and 65 from hitting the radiation fins 63.
　また、放熱フィン６３は、反射用突部６２より前後方向の長さが短く形成されている。なお、ヒートシンク３０の前方放熱フィン３３も、反射用突部６２より前後方向の長さが短く形成されている。 Furthermore, the radiation fins 63 are formed to have a shorter length in the front-rear direction than the reflective protrusions 62. Note that the front heat dissipation fins 33 of the heat sink 30 are also formed to have a shorter length in the front-rear direction than the reflective protrusions 62.
　以上に記載した通り車輌用灯具１にあっては、光源４２、４３が搭載された回路基板４０と、光源４２、４３から光が出射される出射方向側に回路基板４０が取り付けられ光源４２、４３の駆動時に発生する熱を放出するヒートシンク３０と、出射方向とは反対方向側に回路基板４０が取り付けられ光源４２、４３から出射される光を反射するリフレクター６０と、を備え、リフレクター６０は、出射方向に突出した放熱フィン６３が形成される。 As described above, the vehicular lamp 1 includes a circuit board 40 on which the light sources 42 and 43 are mounted, and a circuit board 40 that is attached to the side in which light is emitted from the light sources 42 and 43. 43, and a reflector 60 to which the circuit board 40 is attached on the side opposite to the emission direction and reflects the light emitted from the light sources 42 and 43. , radiation fins 63 protruding in the radiation direction are formed.
　これにより、車輌用灯具１では、光源４２、４３から発せられた熱が、ヒートシンク３０から放出されるとともに、リフレクター６０の放熱フィン６３からも放出されることになる。 As a result, in the vehicle lamp 1, the heat emitted from the light sources 42 and 43 is released from the heat sink 30 and also from the heat radiation fins 63 of the reflector 60.
　そのため、車輌用灯具１は、リフレクター６０の放熱フィン６３から熱が放出される分、例えばヒートシンク３０の後方放熱フィン３２を短くするなど、全体として小型化を図ることができる。
　かくして、車輌用灯具１は、小型化を図った上で光源４２、４３に対する放熱性能の向上を図ることができる。 Therefore, the vehicle lamp 1 can be made smaller as a whole by making the rear radiation fins 32 of the heat sink 30 shorter, for example, by the amount of heat released from the radiation fins 63 of the reflector 60.
Thus, the vehicular lamp 1 can be made smaller and improve the heat dissipation performance of the light sources 42 and 43.
　また、車輌用灯具１は、リフレクター６０の放熱フィン６３から熱が放出される分、光源４２、４３に加えられる電流値を上げて光源４２、４３を明るく発光させることが可能となる。 In addition, the vehicle lamp 1 can increase the current value applied to the light sources 42 and 43 by the amount of heat released from the radiation fins 63 of the reflector 60, thereby making it possible for the light sources 42 and 43 to emit bright light.
　また、リフレクター６０は、光源４２、４３と対向する位置に形成され光源４２、４３から出射される光を通過させる開口部６４、６５を備え、放熱フィン６３は、開口部６４、６５の上下方向にそれぞれ形成される。具体的には、放熱フィン６３は、開口部６４、６５を上下方向に挟んでそれぞれ形成されるとともに、開口部６４、６５を左右方向に挟んでそれぞれ形成される。 Further, the reflector 60 includes openings 64 and 65 that are formed at positions facing the light sources 42 and 43 and allow the light emitted from the light sources 42 and 43 to pass through, and the radiation fins 63 are arranged in the vertical direction of the openings 64 and 65. are formed respectively. Specifically, the radiation fins 63 are formed to sandwich the openings 64 and 65 in the vertical direction, and are formed to sandwich the openings 64 and 65 in the horizontal direction.
　これにより、光源４２、４３から出射され開口部６４、６５を通過した光が放熱フィン６３に邪魔されることなく投影レンズ２０に導かれることが可能となる。従って、車輌用灯具１では、配光を邪魔することなく放熱性能の向上を図ることができる。 This allows the light emitted from the light sources 42 and 43 and passed through the openings 64 and 65 to be guided to the projection lens 20 without being obstructed by the radiation fins 63. Therefore, in the vehicle lamp 1, it is possible to improve the heat dissipation performance without interfering with the light distribution.
　また、ヒートシンク３０は、出射方向に突出する前方放熱フィン３３を備え、放熱フィン６３は、前方放熱フィン３３と上下方向に並んで配置される。 Further, the heat sink 30 includes a front heat dissipation fin 33 that protrudes in the radiation direction, and the heat dissipation fin 63 is arranged in line with the front heat dissipation fin 33 in the vertical direction.
　これにより、前方放熱フィン３３及び放熱フィン６３によって温められた空気が上方向に移動する際に、前方放熱フィン３３及び放熱フィン６３によって経路を邪魔されないため、空気の流れがスムーズとなり、より放熱性能の向上を図ることができる。 As a result, when the air warmed by the front heat dissipation fins 33 and the heat dissipation fins 63 moves upward, the path is not obstructed by the front heat dissipation fins 33 and the heat dissipation fins 63, making the air flow smoother and improving heat dissipation performance. It is possible to improve the
　また、前方放熱フィン３３は、リフレクター６０を囲むように形成され、放熱フィン６３は前方放熱フィン３３より出射方向の長さが短い。
　放熱フィン６３は前方放熱フィン３３よりも開口部６４、６５に近いため、光源４２、４３から出射され開口部６４、６５を通過した光の配光に影響を与える可能性が高い。そこで、放熱フィン６３の出射方向の長さを前方放熱フィン３３より短くすることで、開口部６４、６５を通過した光が放熱フィン６３に当たり難くすることが可能である。
　これにより、車輌用灯具１では、配光を邪魔することなく放熱性能の向上を図ることができる。 Further, the front radiation fin 33 is formed to surround the reflector 60, and the radiation fin 63 has a shorter length in the emission direction than the front radiation fin 33.
Since the radiation fin 63 is closer to the openings 64 and 65 than the front radiation fin 33, it is likely to affect the light distribution of the light emitted from the light sources 42 and 43 and passed through the openings 64 and 65. Therefore, by making the length of the radiation fin 63 in the emission direction shorter than that of the front radiation fin 33, it is possible to make it difficult for the light that has passed through the openings 64 and 65 to hit the radiation fin 63.
Thereby, in the vehicle lamp 1, it is possible to improve heat dissipation performance without interfering with light distribution.
　また、リフレクター６０は、出射方向に突出し光源４２、４３から出射される光を反射する反射用突部６２を備え、放熱フィン６３は、反射用突部６２より外側に形成される。
　これにより、光源４２、４３から出射され開口部６４、６５を通過した光が反射用突部６２に導かれる前に放熱フィン６３に当ってしまうことを回避することが可能である。
　従って、車輌用灯具１は、配光を邪魔することなく放熱性能の向上を図ることができる。 Further, the reflector 60 includes a reflective protrusion 62 that projects in the emission direction and reflects the light emitted from the light sources 42 and 43, and the radiation fins 63 are formed outside the reflective protrusion 62.
This makes it possible to prevent the light emitted from the light sources 42 and 43 and passing through the openings 64 and 65 from hitting the radiation fins 63 before being guided to the reflecting protrusion 62.
Therefore, the vehicle lamp 1 can improve heat dissipation performance without interfering with light distribution.
　なお、上記した実施形態では、車輌用灯具１が車輌用前照灯である例を示したが、車輌用灯具１は車輌用前照灯以外の他の車輌用灯具であってもよく、光が車輌前方へ向けて照射される他、光が車輌後方へ向けて照射される車輌用灯具であってもよい。 In the above-described embodiment, an example is shown in which the vehicle lamp 1 is a vehicle headlamp, but the vehicle lamp 1 may be a vehicle lamp other than a vehicle headlamp, and the vehicle lamp 1 may be a vehicle lamp other than a vehicle headlamp. In addition to emitting light toward the front of the vehicle, it may also be a vehicle lamp that emits light toward the rear of the vehicle.
　また、車輌用灯具１は、空気の対流によって放熱するようにしたが、ファン等によって強制的に空気を当てて放熱させるようにしてもよい。 Furthermore, although the vehicle lamp 1 is configured to radiate heat through air convection, heat may be radiated by forcibly applying air using a fan or the like.
　１…車輌用灯具、３０…ヒートシンク、３２…後方放熱フィン、３３…前方放熱フィン、４０…回路基板、６０…リフレクター、６２…反射用突起、６３…放熱フィン、６４、６５…開口部 1... Vehicle lamp, 30... Heat sink, 32... Rear heat sink, 33... Front heat sink, 40... Circuit board, 60... Reflector, 62... Reflective protrusion, 63... Heat sink, 64, 65... Opening

Claims (5)

  1. 　光源が搭載された回路基板と、
    　前記光源から光が出射される出射方向側に前記回路基板が取り付けられ前記光源の駆動時に発生する熱を放出するヒートシンクと、
    　前記出射方向とは反対方向側に前記回路基板が取り付けられ前記光源から出射される光を反射するリフレクターと、
    　を備え、
    　前記リフレクターは、前記出射方向に突出した放熱フィンが形成される
    　車輌用灯具。     A circuit board equipped with a light source,
    a heat sink to which the circuit board is attached on a side in an emission direction where light is emitted from the light source and radiates heat generated when the light source is driven;
    a reflector to which the circuit board is attached on a side opposite to the emission direction and reflects the light emitted from the light source;
    Equipped with
    The reflector is provided with a radiation fin that protrudes in the emission direction.
  2. 　前記リフレクターは、前記光源と対向する位置に形成され前記光源から出射される光を通過させる開口部を備え、
    　前記放熱フィンは、前記開口部の上下方向にそれぞれ形成される
    　請求項１に記載の車輌用灯具。     The reflector includes an opening formed at a position facing the light source and through which light emitted from the light source passes,
    The vehicular lamp according to claim 1, wherein the radiation fins are formed in the upper and lower directions of the opening.
  3. 　前記ヒートシンクは、前記出射方向に突出する前方放熱フィンを備え、
    　前記放熱フィンは、前記前方放熱フィンと上下方向に並んで配置される
    　請求項１又は請求項２に記載の車輌用灯具。     The heat sink includes a front heat dissipation fin that protrudes in the emission direction,
    The vehicular lamp according to claim 1 or 2, wherein the radiation fins are vertically arranged in line with the front radiation fins.
  4. 　前記前方放熱フィンは、前記リフレクターを囲むように形成され、
    　前記放熱フィンは前記前方放熱フィンより前記出射方向の長さが短い
    　請求項３に記載の車輌用灯具。     The front heat dissipation fin is formed to surround the reflector,
    The vehicular lamp according to claim 3, wherein the radiation fin has a shorter length in the emission direction than the front radiation fin.
  5. 　前記リフレクターは、前記出射方向に突出し前記光源から出射される光を反射する反射用突部を備え、
    　前記放熱フィンは、前記反射用突部より外側に形成される
    　請求項１又は請求項２に記載の車輌用灯具。     The reflector includes a reflective protrusion that protrudes in the emission direction and reflects the light emitted from the light source,
    The vehicular lamp according to claim 1 or 2, wherein the radiation fin is formed outside the reflective protrusion.
PCT/JP2023/029505 2022-08-23 2023-08-15 Vehicle lamp WO2024043144A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012059642A (en) * 2010-09-10 2012-03-22 Koito Mfg Co Ltd Optical unit
JP2012146535A (en) * 2011-01-12 2012-08-02 Ichikoh Ind Ltd Vehicular lamp
JP2015167123A (en) * 2014-02-12 2015-09-24 株式会社小糸製作所 Vehicular lighting fixture
WO2022009683A1 (en) * 2020-07-06 2022-01-13 株式会社小糸製作所 Vehicle lighting unit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012059642A (en) * 2010-09-10 2012-03-22 Koito Mfg Co Ltd Optical unit
JP2012146535A (en) * 2011-01-12 2012-08-02 Ichikoh Ind Ltd Vehicular lamp
JP2015167123A (en) * 2014-02-12 2015-09-24 株式会社小糸製作所 Vehicular lighting fixture
WO2022009683A1 (en) * 2020-07-06 2022-01-13 株式会社小糸製作所 Vehicle lighting unit

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