JP5233590B2 - Vehicle headlamp - Google Patents

Vehicle headlamp Download PDF

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Publication number
JP5233590B2
JP5233590B2 JP2008276922A JP2008276922A JP5233590B2 JP 5233590 B2 JP5233590 B2 JP 5233590B2 JP 2008276922 A JP2008276922 A JP 2008276922A JP 2008276922 A JP2008276922 A JP 2008276922A JP 5233590 B2 JP5233590 B2 JP 5233590B2
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lamp body
fins
vehicle
housing
light
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JP2010108637A (en
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剛雄 加藤
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Toshiba Lighting and Technology Corp
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Toshiba Lighting and Technology Corp
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    • 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
    • F21S45/48—Passive cooling, e.g. using fins, thermal conductive elements or openings with means for conducting heat from the inside to the outside of the lighting devices, e.g. with fins on the outer surface of the lighting device

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Description

この発明は、半導体発光素子を光源として用いた場合の車両用前照灯に関し、特に停止時における冷却に注力している。   The present invention relates to a vehicular headlamp when a semiconductor light emitting element is used as a light source, and particularly focuses on cooling when stopped.

一般に発光ダイオード（ＬＥＤ）等の半導体発光素子を光源とする車両用前照灯は、温度上昇により発光効率が悪くなる。このためＬＥＤを用いた灯具では、温度上昇を抑制する対策が施され、灯具の筐体に設置された状態で水平方向のプレート型のフィン形状とし、筐体の表面積を増大させることで放熱性を高め、ＬＥＤの温度上昇の抑制が行われている。（例えば、特許文献１）
特開２００７−２０７５２８公報（第７頁、図１） In general, a vehicle headlamp that uses a semiconductor light-emitting element such as a light-emitting diode (LED) as a light source has low luminous efficiency due to temperature rise. For this reason, in lamps using LEDs, measures are taken to prevent temperature rise, and the plate-shaped fins in the horizontal direction are installed in the lamp housing to increase heat dissipation by increasing the surface area of the housing. The temperature rise of the LED is suppressed. (For example, Patent Document 1)
JP 2007-207528 (page 7, FIG. 1)

上記した特許文献１の技術は、アルミダイキャストの金属製のランプボディの外表面にフィンを一体形成し、ＬＥＤからの発熱を効率よく放熱させるものである。しかし、ランプボディは、車両側に取り付けるための筐体に覆われる状態で収容されることから、ランプボディに単にフィンを形成しただけでは、車両が停止した場合はフィンが空気の流れを阻害し放熱効果が低く、ランプボディ内の温度が下がらずに発光効率の低下に加え、ＬＥＤの寿命を短くする、という問題があった。   The technique of the above-mentioned Patent Document 1 is to integrally form fins on the outer surface of an aluminum die-cast metal lamp body to efficiently dissipate heat generated from the LED. However, since the lamp body is housed in a state of being covered by a housing for mounting on the vehicle side, the fins obstruct the air flow when the vehicle stops simply by forming the fins on the lamp body. There is a problem that the heat dissipation effect is low, the temperature inside the lamp body does not drop, the luminous efficiency is lowered, and the lifetime of the LED is shortened.

この発明の目的は、車両が停止した場合でも自然対流による放熱効果を持たせたフィン形状とすることで、放熱効果を向上させた半導体発光素子を光源とした車両用前照灯を提供することにある。   An object of the present invention is to provide a vehicular headlamp that uses a semiconductor light-emitting element with improved heat dissipation effect as a light source by adopting a fin shape that has a heat dissipation effect due to natural convection even when the vehicle stops. It is in.

上記した課題を解決するために、この発明の車両用前照灯は、内部に半導体発光素子が配設され、該発光素子の照射側に少なくとも開口が形成された筒状のランプボディと、車両に取り付けられた状態の前記ランプボディの外周面に水平軸に対して回転方向に形成された複数のフィンと、前記フィンとともに前記ランプボディを車両に取り付けるための筐体と、前記フィンを挟む前記筐体の上下にそれぞれ形成した通気口と、を具備したことを特徴とする。 In order to solve the above-described problems, a vehicle headlamp according to the present invention includes a cylindrical lamp body in which a semiconductor light emitting element is disposed, and at least an opening is formed on the irradiation side of the light emitting element. A plurality of fins formed on the outer peripheral surface of the lamp body in a rotational direction with respect to a horizontal axis, a housing for attaching the lamp body to a vehicle together with the fins, and the fin sandwiching the fins And vents formed on the upper and lower sides of the casing, respectively.

この発明によれば、半導体発光素子を光源とした車両用前照灯の冷却にフィンを用いた場合でも、車両停止時におけるスムースな自然対流を起こさせ、効率的な放熱実現することが可能となる。   According to the present invention, even when fins are used for cooling a vehicle headlamp that uses a semiconductor light emitting element as a light source, it is possible to cause smooth natural convection when the vehicle is stopped and to achieve efficient heat dissipation. Become.

以下、この発明を実施するための最良の形態について、図面を参照しながら詳細に説明する。   Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

図１は、この発明の車両用前照灯に関する一実施形態について説明するための概念的な斜視図、図２は図１の車両に取り付ける部材について説明するための斜視図、図３は図１のランプボディについて説明するための斜視図、図４は図３の側面図、図５は図４の断面図、図６は図５のＬＥＤと投影レンズについて説明するための説明図である。   FIG. 1 is a conceptual perspective view for explaining an embodiment of a vehicle headlamp according to the present invention, FIG. 2 is a perspective view for explaining members to be attached to the vehicle of FIG. 1, and FIG. FIG. 4 is a side view of FIG. 3, FIG. 5 is a sectional view of FIG. 4, and FIG. 6 is an explanatory diagram for explaining the LED and the projection lens of FIG.

先ず、図１、図２において、１１は放熱性の高い例えばアルミニウム合金で形成された円筒形状の照射用の開口１１１を有するランプボディである。このランプボディ１１の開口１１１には、照射用の例えばガラス製の透明カバー１３が取着される。１４は、車両側に取り付けるための有底部１４１を備えた耐熱性の樹脂で形成された筐体である。筐体１４には、ランプボディ１１を位置決めした状態で保持し収容する保持部１１２を備える。保持部１１２の内周面には、ランプボディ１１を緩みなく保持させるため、図示しない複数のリブ等による位置決め手段が一体的に形成される。   First, in FIGS. 1 and 2, reference numeral 11 denotes a lamp body having a cylindrical irradiation opening 111 made of, for example, an aluminum alloy having high heat dissipation. A transparent cover 13 made of, for example, glass for irradiation is attached to the opening 111 of the lamp body 11. Reference numeral 14 denotes a housing made of a heat-resistant resin having a bottomed portion 141 for mounting on the vehicle side. The housing 14 includes a holding portion 112 that holds and accommodates the lamp body 11 in a positioned state. Positioning means such as a plurality of ribs (not shown) are integrally formed on the inner peripheral surface of the holding portion 112 in order to hold the lamp body 11 without loosening.

車両に取り付けられた状態で筐体１４の下側となる底面部１４２には、通気口１４３，１４４を、筐体１４の上側となる上面部１４５には通気口１４６がそれぞれ形成される。通気口１４３，１４４から取り込まれた空気は、通気口１４６から放出させることができる。通気口１４３，１４４は、吸気の役割を果たし、通気口１４６は排気の役割を果たすことになる。   Ventilation holes 143 and 144 are formed in the bottom surface portion 142 which is the lower side of the housing 14 when attached to the vehicle, and the ventilation holes 146 are formed in the upper surface portion 145 which is the upper side of the housing 14. The air taken in from the vents 143 and 144 can be released from the vent 146. The vent holes 143 and 144 serve as intake air, and the vent holes 146 serve as exhaust air.

次に、図３、図４を参照しランプボディ１１について説明する。なお、図３はランプボディ１１の斜視図を示すが、筐体１４に収容した状態での通気口１４６側から見た筐体１４の一部の断面も示している。   Next, the lamp body 11 will be described with reference to FIGS. FIG. 3 is a perspective view of the lamp body 11, but also shows a partial cross section of the housing 14 as viewed from the vent 146 side in a state of being accommodated in the housing 14.

円筒形状のランプボディ１１の透明カバー１３が取着された反対側には、バックカバー１５が取り付けられ、ランプボディ１１の内部は、透明カバー１３とバックカバー１５により防水が施された状態で密閉される。ランプボディ１１の外周にはプレート型の複数の冷却用フィン１１３が一体的に形成される。   A back cover 15 is attached to the opposite side of the cylindrical lamp body 11 to which the transparent cover 13 is attached, and the inside of the lamp body 11 is sealed with the transparent cover 13 and the back cover 15 waterproofed. Is done. A plurality of plate-shaped cooling fins 113 are integrally formed on the outer periphery of the lamp body 11.

フィン１１３は、図４に示すように、ランプボディ１１の水平軸４１に対して回転方向に、ランプボディ１１の外周に互いが平行で、かつ車両に搭載された状態で垂直になるような格好で形成される。従って、フィン１１３間の空間部１１４は、ランプボディ１１の下面から上面にかけて図４の矢印で示す垂直方向に素通しの状態となる。空間部１１４は、筐体１４の内面とにより下から上に伸びるダクト１６を構成する。   As shown in FIG. 4, the fins 113 are shaped so that they are parallel to the outer periphery of the lamp body 11 and perpendicular to the outer periphery of the lamp body 11 while being mounted on the vehicle. Formed with. Accordingly, the space 114 between the fins 113 is in a state of passing through in the vertical direction indicated by the arrow in FIG. 4 from the lower surface to the upper surface of the lamp body 11. The space 114 forms a duct 16 that extends from the bottom to the top by the inner surface of the housing 14.

図５において、ランプボディ内の透明カバー１３と対向する位置には、複数のＬＥＤ１７が線状に配設して光源１８として構成された耐熱性の例えばガラスエポキシ製の回路基板１９が配置される。回路基板１９は、ランプボディ１１内に一体形成された取付部１１５に例えば図示しないネジ等の固着手段で取り付けられる。   In FIG. 5, at a position facing the transparent cover 13 in the lamp body, a heat-resistant circuit board 19 made of, for example, glass epoxy, in which a plurality of LEDs 17 are linearly arranged and configured as a light source 18 is arranged. . The circuit board 19 is attached to an attachment portion 115 integrally formed in the lamp body 11 by, for example, fixing means such as screws (not shown).

さらに、ランプボディ１１内には、ＬＥＤ１７が搭載された反対面の回路基板１９から空間１１６を置いて例えば回路基板１９と同材料で形成された回路基板２０が配置される。回路基板２０には、光源１８を駆動させるための駆動回路が構成され図示しないが回路基板１９と回路基板２０とは、電気的に接続されている。   Further, in the lamp body 11, a circuit board 20 made of, for example, the same material as the circuit board 19 is disposed with a space 116 from the circuit board 19 on the opposite side on which the LEDs 17 are mounted. A drive circuit for driving the light source 18 is configured on the circuit board 20, and although not shown, the circuit board 19 and the circuit board 20 are electrically connected.

ＬＥＤ１７は、パッケージとして構成され、光源１８は、例えば４個のＬＥＤ１７で構成されている。光源１８の照射側には、光源１８の光を導入して前方へ出射するプリズムレンズ２１が配置される。   The LED 17 is configured as a package, and the light source 18 is configured by, for example, four LEDs 17. A prism lens 21 that introduces light from the light source 18 and emits it forward is disposed on the irradiation side of the light source 18.

プリズムレンズ２１は、車両用の走行ビームとして必要とされる配向特性、すなわち、鉛直方向では略平行で、水平方向には拡散する配向パターンを有する車両用灯具に適用可能である。   The prism lens 21 can be applied to a vehicle lamp having an alignment characteristic required as a traveling beam for a vehicle, that is, an alignment pattern that is substantially parallel in the vertical direction and diffuses in the horizontal direction.

図６、図７は、車両用の走行ビームの配向パターンに適したプリズムレンズ２１について説明するための説明図であり、図６は斜視図、図７（ａ）はプリズムレンズ２１を出射面側から見た平面図、図７（ｂ），（ｃ）は図７（ａ）のｂ−ｂ線およびｃ−ｃ線に沿う断面図である。   6 and 7 are explanatory views for explaining the prism lens 21 suitable for the alignment pattern of the traveling beam for the vehicle. FIG. 6 is a perspective view, and FIG. 7A shows the prism lens 21 on the exit surface side. 7B and 7C are sectional views taken along lines bb and cc of FIG. 7A.

プリズムレンズ２１は、入射面２１１と出射面２１２とを備えた本体部２１３と、入射面２１１に設けた受光部２１４と、受光部２１４に設けた直射光入射部２１５と、出射面２１２に設けた直射光出射部２１６と、出射面２１２に設けた反射光出射部２１７とを有して構成されており、例えば透明なアクリル樹脂により一体的に射出成形される。本体部２１３は、長さ方向を横軸としてセッティングされる。   The prism lens 21 is provided on a main body 213 having an incident surface 211 and an output surface 212, a light receiving unit 214 provided on the incident surface 211, a direct light incident unit 215 provided on the light receiving unit 214, and an output surface 212. The direct light emitting part 216 and the reflected light emitting part 217 provided on the emission surface 212 are configured to be integrally injection-molded with, for example, a transparent acrylic resin. The main body 213 is set with the length direction as the horizontal axis.

受光部２１４の直射光入射部２１５は平面形状とし、入射面２１１の幅方向の中央部に長さ方向に沿って略コ字形断面の凹条に形成される。この受光部２１４では、両側面２１４ａ、２１４ｂも共に光の入射部を構成している。   The direct light incident portion 215 of the light receiving portion 214 has a planar shape, and is formed in a concave portion having a substantially U-shaped cross section along the length direction at the center portion in the width direction of the incident surface 211. In the light receiving portion 214, both side surfaces 214a and 214b also constitute a light incident portion.

直射光出射部２１６は、出射面２１２の中央部の長さ方向に沿って断面凸曲形状の先端面を有する凸条として形成されており、反射光出射部２１７は、出射面２１２の直射光出射部２１６の上側および下側にそれぞれ形成されている。   The direct light emitting part 216 is formed as a convex line having a tip surface with a convex cross section along the length direction of the central part of the emitting surface 212, and the reflected light emitting part 217 is a direct light of the emitting surface 212. It is formed on the upper side and the lower side of the emission part 216, respectively.

さらに、線状光源１８は、４個のＬＥＤ１７を、その発光部を受光部２１４に嵌入させて組み付けることによって構成されている。すなわち、４個のＬＥＤ１７は、その基端側を回路基板１９に取着するとともに、その発光部を、回路基板１９に入射面２１１を対向させて長さ方向を横軸としてセッティングされた本体部２１３の受光部２１４に嵌入させて組み付けられている。このとき、それぞれのＬＥＤ１７は、その発光部の発光中心を、本体部２１３の外周形状である放物線の焦点位置にほぼ合致させた状態で取り付けられている。   Further, the linear light source 18 is configured by assembling four LEDs 17 with their light emitting portions fitted into the light receiving portions 214. That is, the four LEDs 17 are attached to the circuit board 19 at the base end side, and the light emitting part is set to the circuit board 19 with the incident surface 211 facing the main body part set with the length direction as the horizontal axis. 213 is fitted into the light receiving portion 214 and assembled. At this time, each LED 17 is attached in a state in which the light emission center of the light emitting part is substantially matched with the focal position of the parabola that is the outer peripheral shape of the main body part 213.

このようにして構成された車両用灯具１０では、４個のＬＥＤ１７から放射された光を、受光部２１４の両側面２１４ａ、２１４ｂおよび受光部２１４の直射光入射部２１５を介して本体部２１３に導入させる。受光部２１４の両側面２１４ａ、２１４ｂから本体部２１３に導入された光は、主に、本体部２１３の上下両側面を構成する放物面状の外周面２１８ａ、２１８ｂにそれぞれ達し、この外周面２１８ａ、２１８ｂにてそれぞれ全反射されたのち、反射光出射部２１７から外方へ出射される。すなわち、反射光出射部２１７から反射光が出射させることで、本体部２１３の長さ方向に長い横長の帯状の配光パターンとなる。   In the vehicular lamp 10 configured as described above, the light emitted from the four LEDs 17 is transmitted to the main body 213 via the both side surfaces 214a and 214b of the light receiving unit 214 and the direct light incident unit 215 of the light receiving unit 214. Let it be introduced. The light introduced into the main body part 213 from both side surfaces 214a and 214b of the light receiving part 214 mainly reaches the parabolic outer peripheral surfaces 218a and 218b constituting the upper and lower side surfaces of the main body part 213, respectively. After total reflection at 218a and 218b, the light is emitted outward from the reflected light emitting portion 217. That is, when the reflected light is emitted from the reflected light emitting portion 217, a horizontally-long belt-like light distribution pattern that is long in the length direction of the main body portion 213 is obtained.

車両が停止した場合は、図８に示すように下側の通気口１４３，１４４から上側の通気口１４６に対して、鉛直方向に形成されたフィン１１３と筐体１４との間に構成されるダクト１６の煙突効果により、通気口１４３，１４４から通気口１４６に波線矢印ｘ，ｙに示す自然対流による空気の流れが発生している。これにより、車両停止時のランプボディ１１の温度上昇は抑えられ、結果として内部のＬＥＤ１７等の温度上昇も抑えることが可能となる。   When the vehicle stops, as shown in FIG. 8, it is configured between the fin 113 formed in the vertical direction and the casing 14 from the lower vents 143 and 144 to the upper vent 146. Due to the chimney effect of the duct 16, an air flow by natural convection is generated from the vent holes 143 and 144 to the vent hole 146 as indicated by the wavy arrows x and y. Thereby, the temperature rise of the lamp body 11 when the vehicle is stopped can be suppressed, and as a result, the temperature rise of the internal LEDs 17 and the like can be suppressed.

筐体１４とランプボディ１１に形成されるフィンとの放熱状態について、この発明と従来の比較した結果、従来の場合のＬＥＤ近部の筐体温度が６５℃程度あったのに対し、この発明のＬＥＤ近部の筐体温度が５５℃程度となり、この発明の構成におけるＬＥＤの温度上昇の抑制を確認することができた。   As a result of comparison between the present invention and the conventional heat dissipation state between the housing 14 and the fins formed on the lamp body 11, the housing temperature in the vicinity of the LED in the conventional case was about 65 ° C. The housing temperature in the vicinity of the LED became about 55 ° C., and it was confirmed that the temperature rise of the LED in the configuration of the present invention was suppressed.

この実施形態では、円筒状の外形の外周面に、車両に取り付けられた状態のランプボディ１１は、水平軸に対して回転方向にプレート型の冷却用のフィン１１３が形成されている。ランプボディ１１は、車両側に取り付ける筐体１４の通気口１４３，１４４と通気口１４６をそれぞれ形成させた筐体１４の通気口１４３，１４４と通気口１４６にランプボディ１１のフィン１１３を位置させた状態で筐体１４に収容させている。   In this embodiment, the lamp body 11 attached to the vehicle is formed with plate-shaped cooling fins 113 in the rotational direction with respect to the horizontal axis on the outer peripheral surface of the cylindrical outer shape. The lamp body 11 is configured such that the fins 113 of the lamp body 11 are positioned in the vent holes 143 and 144 and the vent hole 146 of the casing 14 in which the vent holes 143 and 144 and the vent hole 146 of the casing 14 attached to the vehicle side are respectively formed. It is made to accommodate in the housing | casing 14 in the state.

これにより、車両が停止状態にあってもフィン１１３の空間部１１４と筐体１４の内面との間に構成されるダクト１６による自然対流の作用で、フィン１１３を冷却することが可能となり、その結果、ランプボディ１１内の温度上昇を抑え、延いてはＬＥＤ１７の温度を抑えることが可能となる。   As a result, even when the vehicle is stopped, the fin 113 can be cooled by the action of natural convection by the duct 16 formed between the space 114 of the fin 113 and the inner surface of the housing 14. As a result, the temperature rise in the lamp body 11 can be suppressed, and the temperature of the LED 17 can be suppressed.

この発明は、上記した実施形態に限定されるものではなく、例えば、ランプボディ１１の背面側に取り付けたバックカバー１５は、ランプボディ１１と一体形成したものであっても構わない。この場合の回路基板２０は、回路基板１９のように開口１１１から挿入し取り付けるようにすればよい。また、光源１８には４個使いのＬＥＤ１７としたが、必要に応じて増減されるものである。   The present invention is not limited to the above-described embodiment. For example, the back cover 15 attached to the back side of the lamp body 11 may be integrally formed with the lamp body 11. The circuit board 20 in this case may be inserted and attached through the opening 111 like the circuit board 19. Further, although the four light-emitting LEDs 17 are used for the light source 18, it is increased or decreased as necessary.

さらに、ランプホディ１１には、アルミニウムの合金が使用されているが、アルミニウム合金以外の金属でもよく、高熱伝導率または高放射率セラミックスを使用してもよい。ランプボディ１１の形状を円筒形状にしているが、直方体のような構造であってもよく、プレート状のフィン７が外表面の少なくとも一部に水平軸に対して回転方向に形成されていればよい。   Further, although an alloy of aluminum is used for the lamp body 11, a metal other than the aluminum alloy may be used, and ceramics having high thermal conductivity or high emissivity may be used. Although the lamp body 11 has a cylindrical shape, it may have a rectangular parallelepiped structure. If the plate-like fins 7 are formed on at least a part of the outer surface in the rotational direction with respect to the horizontal axis. Good.

この発明の車両用前照灯に関する一実施形態について説明するための概念的な斜視図。The conceptual perspective view for demonstrating one Embodiment regarding the vehicle headlamp of this invention. 図１要部の斜視図。The perspective view of the principal part of FIG. 図１要部の斜視図。The perspective view of the principal part of FIG. 図３の側面図。FIG. 4 is a side view of FIG. 3. 図４の断面図。Sectional drawing of FIG. プリズムレンズについて説明するための斜視図。The perspective view for demonstrating a prism lens. 図６のプリズムレンズについて説明するための、（ａ）は出射面側から見た平面図、（ｂ）は（ａ）のｂ−ｂ線に沿う断面図、（ｃ）は（ａ）のｃ−ｃ線に沿う断面図。6A is a plan view seen from the exit surface side, FIG. 6B is a cross-sectional view taken along the line bb in FIG. 6A, and FIG. Sectional drawing which follows the -c line. この発明の効果について説明するための説明図。Explanatory drawing for demonstrating the effect of this invention.

符号の説明Explanation of symbols

１１ ランプボディ
１１１ 開口
１１２ 保持部
１１３ フィン
１１４ 空間部
１１５ 取付部
１１６ 空間
１３ 透明カバー
１４ 筐体
１４１ 有底
１４２ 底面部
１４３，１４４，１４６ 通気口
１４５ 上面部
１５ バックカバー
１６ ダクト
１７ ＬＥＤ
１８ 光源
１９，２０ 回路基板
２１ プリズムレンズ
２１１ 入射面
２１２ 出射面 11 Lamp body 111 Opening 112 Holding portion 113 Fin 114 Space portion 115 Mounting portion 116 Space 13 Transparent cover 14 Housing 141 Bottom 142 Bottom surface portion 143, 144, 146 Vent 145 Upper surface portion 15 Back cover 16 Duct 17 LED
18 Light source 19, 20 Circuit board 21 Prism lens 211 Entrance surface 212 Exit surface

Claims (2)

内部に半導体発光素子が配設され、該発光素子の照射側に少なくとも開口が形成された筒状のランプボディと、
車両に取り付けられた状態の前記ランプボディの外周面に水平軸に対して回転方向に形成された複数のフィンと、
前記フィンとともに前記ランプボディを車両に取り付けるための筐体と、
前記フィンを挟む前記筐体の上下にそれぞれ形成した通気口と、を具備したことを特徴とする車両用前照灯。 A cylindrical lamp body in which a semiconductor light emitting element is disposed, and at least an opening is formed on the irradiation side of the light emitting element;
A plurality of fins formed in a rotation direction with respect to a horizontal axis on an outer peripheral surface of the lamp body in a state of being attached to a vehicle;
A housing for attaching the lamp body to the vehicle together with the fins;
Vehicular headlamps comprising vents formed on the upper and lower sides of the casing sandwiching the fins, respectively. 前記フィン間の空間部と前記筐体との間に下から上に伸びるダクトを構成することを特徴とする請求項１記載の車両用前照灯。   The vehicle headlamp according to claim 1, wherein a duct extending from below to above is formed between the space between the fins and the housing.
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WO2015111543A1 (en) 2014-01-22 2015-07-30 株式会社小糸製作所 Vehicle lamp
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JP4730717B2 (en) * 2005-09-20 2011-07-20 スタンレー電気株式会社 Vehicle lamp.
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