JP2008078088A - Vehicular led lighting fixture - Google Patents

Vehicular led lighting fixture Download PDF

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Publication number
JP2008078088A
JP2008078088A JP2006259110A JP2006259110A JP2008078088A JP 2008078088 A JP2008078088 A JP 2008078088A JP 2006259110 A JP2006259110 A JP 2006259110A JP 2006259110 A JP2006259110 A JP 2006259110A JP 2008078088 A JP2008078088 A JP 2008078088A
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Prior art keywords
lamp
led
heat
heat sink
light source
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JP4780776B2 (en
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Yasushi Tanida
安 谷田
Takashi Shimada
傑 島田
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Stanley Electric Co Ltd
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Stanley Electric Co Ltd
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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
    • 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]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • F21S41/148—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device the main emission direction of the LED being perpendicular to the optical axis
    • 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
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/30—Ventilation or drainage of lighting devices
    • F21S45/33—Ventilation or drainage of lighting devices specially adapted for headlamps

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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular LED lighting fixture using LEDs for light sources, in which temperature rise in LED light sources is suppressed by increasing the heat radiation properties of the self generated heat of the LED light sources and the predetermined quantity of light irradiation is secured by reducing a decrease in luminous efficiency in the LED light sources. <P>SOLUTION: A lamp chamber 15 is mainly formed of a front surface lens 13 and a housing 14. A lamp unit 3 having an LED light sources 21, a heat sink portion 8 and so on, and a lamp unit 1 united with a bracket 4 are disposed in the lamp chamber 15. Thus, the self generated heat of the LED light sources 21 while they are lit is radiated by the heat sink portion 8 and the bracket 4 to suppress temperature rise in the LED lighting fixture 21, and the predetermined quantity of light irradiation required for a vehicular LED lamp fixture 24 is secured. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明はＬＥＤを光源とする車両用ＬＥＤ灯具に関する。   The present invention relates to a vehicle LED lamp using an LED as a light source.

ＬＥＤは温度上昇によって発光効率が低下するという特性を有している。ＬＥＤの温度上昇の要因は、点灯時の自己発熱や高温環境下に晒された場合等が考えられる。   The LED has a characteristic that the light emission efficiency decreases as the temperature rises. Possible causes of LED temperature rise include self-heating during lighting and exposure to a high temperature environment.

一方、ＬＥＤは各種ランプに比較して一般的に小型、低消費電力、長寿命等の利点を有しており、従来この利点を利用してハイマウントストップランプ、ストップアンドテールランプ、方向指示灯等の車両用灯具の光源として使用され、近年ではＬＥＤを光源とする車両用前照灯の提案もなされている。   On the other hand, LEDs generally have advantages such as small size, low power consumption, and long life compared to various lamps. Conventionally, LEDs have been used to make high-mount stop lamps, stop-and-tail lamps, turn signals, etc. In recent years, a vehicle headlamp using an LED as a light source has been proposed.

車両用灯具は一般的に前面レンズとハウジングとによって灯室が形成され、その灯室内に光源となるＬＥＤが支持される。そしてＬＥＤを点灯すると、ＬＥＤの自己発熱によってＬＥＤ自体の温度が上昇し、その結果、ＬＥＤの発光効率が低下して灯具の照射光量が低減すると共に、配光性能の悪化によって極端な場合には灯具に要求される配光規格を満足しなくなる可能性も有している。   In general, a vehicular lamp has a lamp chamber formed by a front lens and a housing, and an LED serving as a light source is supported in the lamp chamber. When the LED is turned on, the temperature of the LED itself rises due to the self-heating of the LED, and as a result, the light emission efficiency of the LED decreases and the amount of irradiation light of the lamp decreases, and in the extreme case due to the deterioration of the light distribution performance There is also a possibility that the light distribution standard required for the lamp will not be satisfied.

そこで、上記問題の発生を阻止するような車両用前照灯の提案がなされている。それは図５に示すように、透明カバー５１と、ランプボディ５２と、鉛直パネル部５３およびユニット支持部５４およびヒートシンク部５５が一体化された支持ブラケット５６と、ソケットカバー５７とで車両用前照灯５０の灯室５８を形成し、前照灯５０の灯室５８内には支持ブラケット５６の鉛直パネル部５３及びユニット支持部５４が位置し、ヒートシンク部５５は前照灯５０の灯室５８外に延出している。   Therefore, proposals have been made for vehicle headlamps that prevent the occurrence of the above problems. As shown in FIG. 5, the vehicle head includes a transparent cover 51, a lamp body 52, a support bracket 56 in which a vertical panel portion 53, a unit support portion 54 and a heat sink portion 55 are integrated, and a socket cover 57. A lamp chamber 58 of the lamp 50 is formed, and the vertical panel portion 53 and the unit support portion 54 of the support bracket 56 are located in the lamp chamber 58 of the headlamp 50, and the heat sink portion 55 is a lamp chamber 58 of the headlamp 50. It extends outside.

そして、前照灯５０の灯室５８内に位置した支持ブラケット５６のユニット支持部５４には半導体発光素子５９とリフレクタ６０と光制御部材６１とが固定され、光制御部材６１は投影レンズ６２を支持している。   A semiconductor light emitting element 59, a reflector 60, and a light control member 61 are fixed to the unit support portion 54 of the support bracket 56 located in the lamp chamber 58 of the headlamp 50. The light control member 61 includes a projection lens 62. I support it.

半導体発光素子５９を光源とする上記構成の車両用前照灯５０においては、半導体発光素子５９の点灯時の自己発熱は、熱の良導体である材料によって形成された支持ブラケット５６のユニット支持部５４からヒートシンク部５５まで伝導されて移動し、ヒートシンク部５５で灯室５８外に放散される。これにより、半導体発光素子５９点灯時の半導体発光素子５９自体の温度上昇を抑制するようにしている（例えば、特許文献１参照。）。
特開２００５−１４１９１７号公報 In the vehicle headlamp 50 having the above-described configuration using the semiconductor light emitting element 59 as a light source, self-heating when the semiconductor light emitting element 59 is turned on is a unit support portion 54 of a support bracket 56 formed of a material that is a good conductor of heat. Then, the heat is transferred from the heat sink portion 55 to the heat sink portion 55, and is dissipated outside the lamp chamber 58 by the heat sink portion 55. Thereby, the temperature rise of the semiconductor light emitting element 59 itself when the semiconductor light emitting element 59 is turned on is suppressed (see, for example, Patent Document 1).
JP-A-2005-141917

上記従来の車両用前照灯５０においては、半導体発光素子５９で発生した熱のほとんどは該半導体発光素子５９が載設された支持ブラケット５６のユニット支持部５４からヒートシンク部５５まで伝導されてヒートシンク部５５で灯室５８外に放散される。   In the conventional vehicle headlamp 50, most of the heat generated in the semiconductor light emitting device 59 is conducted from the unit support portion 54 of the support bracket 56 on which the semiconductor light emitting device 59 is mounted to the heat sink portion 55 to be heat sink. The light is dissipated outside the lamp chamber 58 at the section 55.

ところで、ヒートシンク部５５は、ヒートシンク部５５の外気（空気）と接する部分の全表面の放熱面積が大きいほど放熱効率が高くなり、放熱効果も良好となる。換言すると、ヒートシンク部５５の大きさが放熱効率に関係することになるが、ヒートシンク部５５が大きくなると車両用前照灯５０全体が大きくなると共に、重量も増すことになる。そのため、車両用前照灯５０の取り付け空間ならびに重量の制約によってヒートシンク部５０の寸法の設計自由度が確保できず、十分な放熱効率が得られないことが考えられる。   By the way, the heat sink portion 55 has a higher heat dissipation efficiency and a better heat dissipation effect as the heat dissipation area of the entire surface of the heat sink portion 55 in contact with the outside air (air) is larger. In other words, the size of the heat sink portion 55 is related to the heat dissipation efficiency. However, when the heat sink portion 55 is increased, the entire vehicle headlamp 50 is increased and the weight is also increased. For this reason, it is conceivable that the degree of freedom in designing the dimensions of the heat sink portion 50 cannot be ensured due to the mounting space and weight restrictions of the vehicle headlamp 50, and sufficient heat dissipation efficiency cannot be obtained.

そこで、本発明は上記問題に鑑みて創案なされたもので、その目的とするところは、ＬＥＤを光源とする車両用ＬＥＤ灯具において、小型・軽量を維持しつつＬＥＤの自己発熱の放熱性を高めることによってＬＥＤの温度上昇を抑制し、よってＬＥＤの発光効率の低下が抑制されて所定の照射光量を確保することが可能となる車両用ＬＥＤ灯具を提供することにある。   Therefore, the present invention was devised in view of the above problems, and the object of the present invention is to increase the heat dissipation of self-heating of the LED while maintaining the small size and light weight in the vehicle LED lamp using the LED as a light source. Accordingly, an object of the present invention is to provide a vehicular LED lamp that suppresses the temperature rise of the LED, thereby suppressing a decrease in the light emission efficiency of the LED and ensuring a predetermined amount of irradiation light.

上記課題を解決するために、本発明の請求項１に記載された発明は、少なくとも１つのＬＥＤ光源と、前記ＬＥＤ光源から出射された光の光路を制御する光学系と、前記ＬＥＤ光源で発生した熱を放熱する放熱部材を備えた灯具ユニットが少なくとも前面レンズとハウジングによって形成された灯室内に支持され、前記放熱部材が前記灯具ユニットに備えられたヒートシンク部と前記灯具ユニットに備えられて該灯具ユニットが支持されるブラケットであることを特徴とするものである。   In order to solve the above problems, the invention described in claim 1 of the present invention is generated by at least one LED light source, an optical system for controlling an optical path of light emitted from the LED light source, and the LED light source. A lamp unit including a heat dissipation member that dissipates the heat is supported in at least a lamp chamber formed by a front lens and a housing, and the heat dissipation member is provided in the heat sink portion provided in the lamp unit and the lamp unit. The lamp unit is a bracket that is supported.

また、本発明の請求項２に記載された発明は、請求項１において、前記灯具ユニットは前記ブラケットを介して前記灯室内に回動および／または傾動自在に支持されていることを特徴とするものである。   The invention described in claim 2 of the present invention is characterized in that, in claim 1, the lamp unit is supported in the lamp chamber through the bracket so as to be rotatable and / or tiltable. Is.

また、本発明の請求項３に記載された発明は、請求項１または２のいずれか１項において、前記ＬＥＤ光源はＬＥＤチップ及びＬＥＤチップを備えたＬＥＤ装置のいずれか一方であることを特徴とするものである。   Moreover, the invention described in claim 3 of the present invention is characterized in that, in any one of claims 1 and 2, the LED light source is one of an LED chip and an LED device including the LED chip. It is what.

本発明の車両用ＬＥＤ灯具は、ＬＥＤ光源と、ＬＥＤ光源から出射された光の光路を制御する光学系と、ＬＥＤ光源で発生した熱を放熱する放熱部材を備えた灯具ユニットを灯室内に支持するようにした。   The vehicular LED lamp of the present invention supports a lamp unit including an LED light source, an optical system that controls the optical path of light emitted from the LED light source, and a heat radiating member that radiates heat generated by the LED light source in the lamp chamber. I tried to do it.

そして、灯具ユニットに備えられたヒートシンク部と灯具ユニットに備えられて該灯具ユニットが支持されるブラケットを放熱部材とした。   And the heat sink part with which the lamp unit was equipped, and the bracket with which the lamp unit was supported by the lamp unit were used as the heat radiating member.

そのため、ＬＥＤ光源の点灯時に発生する自己発熱はヒートシンク部とブラケットの両方で放散され、ＬＥＤ光源を有する灯具ユニットの放熱性が向上し、ＬＥＤ光源の温度上昇が抑制されるによってＬＥＤ光源の発光効率の低下が低減されて所定の照射光量を確保することが可能となる。   Therefore, the self-heating generated when the LED light source is turned on is dissipated by both the heat sink and the bracket, the heat dissipation of the lamp unit having the LED light source is improved, and the temperature rise of the LED light source is suppressed, so the luminous efficiency of the LED light source It is possible to secure a predetermined amount of irradiation light.

また、従来ヒートシンク部が担っていた放熱量の一部をブラケットに分担させることができるため、ヒートシンク部を従来よりも小さくしてヒートシンク部からの放熱量が少なくなっても、灯具ユニット全体としては十分な放熱性を確保することが可能となる。   Also, since the bracket can share a part of the heat dissipation amount that the heat sink part conventionally has, even if the heat sink part is made smaller than before and the heat dissipation from the heat sink part is reduced, the lamp unit as a whole It is possible to ensure sufficient heat dissipation.

そのため、ヒートシンク部の小型化によって車両用ＬＥＤ灯具の小型化、特に車両に搭載したときに車両の前後方向となる奥行きを短くすることが可能となると共に、車両用ＬＥＤ灯具の軽量化を図ることができる。   Therefore, it is possible to reduce the size of the vehicle LED lamp by reducing the size of the heat sink, and particularly to reduce the depth in the vehicle front-rear direction when mounted on the vehicle, and to reduce the weight of the vehicle LED lamp. Can do.

よって、灯具全体としての放熱効率を確保しながらヒートシンク部の寸法を小さくすることができ、灯具の取付け空間に制約が加えられたとしても放熱性能を維持しながら寸法の設計自由度を確保することが可能となる。   Therefore, it is possible to reduce the size of the heat sink while ensuring the heat dissipation efficiency of the entire lamp, and to ensure the degree of design freedom while maintaining the heat dissipation performance even if there is a restriction on the installation space of the lamp Is possible.

以下、この発明の好適な実施形態を図１〜図４を参照しながら、詳細に説明する（同一部分については同じ符号を付す）。尚、以下に述べる実施形態は、本発明の好適な具体例であるから、技術的に好ましい種々の限定が付されているが、本発明の範囲は、以下の説明において特に本発明を限定する旨の記載がない限り、これらの実施形態に限られるものではない。   Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4 (the same reference numerals are given to the same parts). The embodiments described below are preferable specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. Unless stated to the effect, the present invention is not limited to these embodiments.

図１は本発明の車両用ＬＥＤ灯具を構成する灯具ユニットの分解立体図である。灯具ユニット１は３つのプロジェクタランプ２が一体化されたランプユニット３とブラケット４を有している。夫々のプロジェクタランプ２はＬＥＤ（図示せず）を光源とし、リフレクタ５、レンズホルダ６および投影レンズ７等で構成され、放熱用のヒートシンク部８も備えている。   FIG. 1 is an exploded three-dimensional view of a lamp unit constituting the vehicular LED lamp of the present invention. The lamp unit 1 includes a lamp unit 3 and a bracket 4 in which three projector lamps 2 are integrated. Each projector lamp 2 uses an LED (not shown) as a light source, and includes a reflector 5, a lens holder 6, a projection lens 7, and the like, and also includes a heat sink portion 8 for heat dissipation.

ブラケット４は金属等の熱の良導体からなり、略コ字形状を呈しており、該コ字形状の対向する一対の面のうちの一方の面には外面から外側に延びるシャフト部９が設けられ、他方の面には同様に外面から外側に延びるボス部１０が設けられている。そして、シャフト部９とボス部１０は夫々の中心軸Ｘを共有する位置に位置している。ブラケット４のコ字形状の一対の面で挟まれた面には貫通する窓孔１１が設けられている。   The bracket 4 is made of a good heat conductor such as metal and has a substantially U shape. A shaft portion 9 extending outward from the outer surface is provided on one surface of a pair of opposing surfaces of the U shape. The other surface is similarly provided with a boss portion 10 extending outward from the outer surface. And the shaft part 9 and the boss | hub part 10 are located in the position which shares each central axis X. FIG. A penetrating window hole 11 is provided in a surface sandwiched between a pair of U-shaped surfaces of the bracket 4.

そして、ランプユニット３とブラケット４は、ランプユニット３に備えられたヒートシンク部８とブラケット４のコ字形状の一対の面で挟まれた面がＴＩＭ（サーマル・インタフェース・マテリアル）１２を介して面接触した状態で一体化され、灯具ユニット１を形成している。   The lamp unit 3 and the bracket 4 have a surface sandwiched between a pair of U-shaped surfaces of the heat sink portion 8 and the bracket 4 provided in the lamp unit 3 through a TIM (thermal interface material) 12. The lamp unit 1 is formed by being integrated in contact.

従って、灯具ユニットは図２に示すように、ランプユニット３がＴＩＭを介してブラケット４に支持されていると共に、各プロジェクタランプ２の光軸Ｙはブラケット４のシャフト部９とボス部１０の共通中心軸Ｘに対して略直角の方向を向いている。   Therefore, as shown in FIG. 2, the lamp unit 3 is supported by the bracket 4 via the TIM, and the optical axis Y of each projector lamp 2 is common to the shaft portion 9 and the boss portion 10 of the bracket 4. The direction is substantially perpendicular to the central axis X.

図３は上記灯具ユニットを組み込んだ車両用ＬＥＤ灯具の断面図である。本車両用ＬＥＤ灯具は、主に前面レンズ１３およびハウジング１４の２つの部材によって灯室１５が形成されている。前面レンズ１３とハウジング１４は、ハウジング１４の一方の前面開口端部に設けられたシール溝部１６に前面レンズ１３の周端に設けられたシール脚部１７を挿入し、シール溝部１６とシール脚部１７との隙間に弾性シール材１８を充填した状態で係止されている。   FIG. 3 is a sectional view of a vehicular LED lamp incorporating the lamp unit. In this vehicle LED lamp, a lamp chamber 15 is mainly formed by two members, a front lens 13 and a housing 14. In the front lens 13 and the housing 14, a seal leg 17 provided at the peripheral end of the front lens 13 is inserted into a seal groove 16 provided at one front opening end of the housing 14, and the seal groove 16 and the seal leg are inserted. 17 is locked in a state in which the elastic sealing material 18 is filled in a gap with the gap 17.

なお、本実施形態においては、ハウジング側にシール溝部、前面レンズ側にシール脚部が設けられているが、前面レンズ側にシール溝部、ハウジング側にシール脚部を設けてもよいし、前面レンズとハウジングとでシール効果を有する係止部が構成されるのであれば、両者の係止部の構造、係止手段等については特に限定されるものではない。   In this embodiment, the seal groove portion is provided on the housing side and the seal leg portion is provided on the front lens side. However, the seal groove portion may be provided on the front lens side and the seal leg portion on the housing side. As long as a locking portion having a sealing effect is formed by the housing and the housing, the structure of the locking portions, the locking means and the like are not particularly limited.

灯室１５内には灯具ユニット１が収納され、ブラケット４のシャフト部９がモータ等からなる駆動機構１９に連結されて回動および／または傾動自在に支持されると共に、ボス部１０が支持機構２０に回動および／または傾動自在に支持されている。ブラケット４には上述したようにＴＩＭを介してランプユニット３が一体化されている。   The lamp unit 1 is housed in the lamp chamber 15, and the shaft portion 9 of the bracket 4 is connected to a drive mechanism 19 made of a motor or the like and supported so as to be rotatable and / or tiltable, and the boss portion 10 is supported by the support mechanism. 20 is supported so as to be rotatable and / or tiltable. As described above, the lamp unit 3 is integrated with the bracket 4 via the TIM.

そして、ランプユニット３の夫々のプロジェクタランプ２にはＬＥＤ光源２１、該ＬＥＤ光源２１が載設されたマウント部２２、マウント部２２に着接されたヒートシンク部８、リフレクタ５、遮蔽体２３、レンズホルダ６および投影レンズ７が備えられている。   Each projector lamp 2 of the lamp unit 3 has an LED light source 21, a mount part 22 on which the LED light source 21 is mounted, a heat sink part 8 attached to the mount part 22, a reflector 5, a shield 23, and a lens. A holder 6 and a projection lens 7 are provided.

上記構成の車両用ＬＥＤ灯具２４は、ＬＥＤ光源２１を点灯すると、ＬＥＤ光源２１から出射された光がリフレクタ５、遮蔽体２３、レンズホルダ６および投影レンズ７で構成された光学系を介して前面レンズ１３から車両用ＬＥＤ灯具２４の前方に照射される。   When the LED light source 24 for a vehicle having the above-described configuration is turned on, the light emitted from the LED light source 21 passes through the optical system including the reflector 5, the shield 23, the lens holder 6, and the projection lens 7. The light is emitted from the lens 13 to the front of the vehicle LED lamp 24.

それと共に、「背景技術」で述べたように、ＬＥＤ光源２１は点灯時に自己発熱し、その自己発熱によってＬＥＤ自体の温度が上昇することになり、ＬＥＤの発光効率の低下に起因して灯具の照射光量が低減することになる。   At the same time, as described in “Background Art”, the LED light source 21 self-heats when turned on, and the self-heat increases the temperature of the LED itself. The amount of irradiation light is reduced.

そこで、本発明の車両用ＬＥＤ灯具においては、ＬＥＤ光源の点灯時の温度上昇を抑制するような熱の流路を形成している。   Therefore, in the vehicle LED lamp of the present invention, a heat flow path is formed so as to suppress a temperature rise when the LED light source is turned on.

それは、ＬＥＤ光源２１が点灯するとＬＥＤ光源２１で発生した熱はＬＥＤ光源２１が載設されたマウント部２２に移動する。マウント部２２に移った熱はマウント部２２を伝導されて該マウント部２２に着接されたヒートシンク部８に移動する。   That is, when the LED light source 21 is turned on, the heat generated by the LED light source 21 moves to the mount portion 22 on which the LED light source 21 is mounted. The heat transferred to the mount unit 22 is conducted through the mount unit 22 and moves to the heat sink unit 8 attached to the mount unit 22.

ヒートシンク部８に移った熱はヒートシンク部８内を伝導されてヒートシンク部８の表面に至る。このとき、ヒートシンク部８には表面積を大きくするために多数の放熱フィンが形成されており、放熱フィンを含むヒートシンク部８の表面に到達した熱の一部は効率良く該表面近傍の空気に熱伝達されて移動し、空気を媒体として灯室１５内に放散される。なお、ヒートシンク部８の中央部から出た熱については、ブラケット４に設けられた窓孔１１を通って灯室１５内に放散されるものもある。   The heat transferred to the heat sink unit 8 is conducted through the heat sink unit 8 and reaches the surface of the heat sink unit 8. At this time, in order to increase the surface area, the heat sink portion 8 is formed with a large number of radiating fins, and a part of the heat reaching the surface of the heat sink portion 8 including the radiating fins is efficiently heated to the air near the surface. It is transmitted and moved, and is diffused into the lamp chamber 15 using air as a medium. Some of the heat generated from the central portion of the heat sink portion 8 is dissipated into the lamp chamber 15 through the window hole 11 provided in the bracket 4.

更に、ヒートシンク部８の表面に到達した熱の一部はブラケット４に移動する。ブラケット部４は熱の良導体からなっており、ブラケット４に移った熱はブラケット４内を伝導されてブラケット４の表面に至る。ブラケット４の表面に到達した熱は該表面近傍の空気に熱伝達されて移動し、空気を媒体として灯室１５内に放散される。   Further, part of the heat that reaches the surface of the heat sink portion 8 moves to the bracket 4. The bracket portion 4 is made of a good heat conductor, and the heat transferred to the bracket 4 is conducted through the bracket 4 and reaches the surface of the bracket 4. The heat that has reached the surface of the bracket 4 is transferred to the air in the vicinity of the surface and moves, and is diffused into the lamp chamber 15 using air as a medium.

そして、灯室１５内に放散された熱は、ハウジング１４に設けられた通気孔２５を通って灯具外に放出され、灯室１５内の熱が灯具外に移動することによって灯室１５内の温度が下がる。   Then, the heat dissipated in the lamp chamber 15 is released to the outside of the lamp through the vent hole 25 provided in the housing 14, and the heat in the lamp chamber 15 moves to the outside of the lamp to cause the heat in the lamp chamber 15. The temperature goes down.

このように、ＬＥＤ光源２１で発生した熱はヒートシンク部８と放熱機能を持たせたブラケット４の両方によって放散される。そのため、ヒートシンク部８のみによる放熱効果よりも優れた放熱効果を得ることができ、ＬＥＤ光源２１点灯時の温度上昇の抑制効果が良好に働いて発光効率の低下を効率良く抑えることができる。   Thus, the heat generated by the LED light source 21 is dissipated by both the heat sink portion 8 and the bracket 4 having a heat dissipation function. Therefore, it is possible to obtain a heat dissipation effect superior to the heat dissipation effect by only the heat sink portion 8, and the effect of suppressing the temperature rise when the LED light source 21 is turned on works well, so that a decrease in light emission efficiency can be efficiently suppressed.

なお、灯具ユニット１を構成する部材を熱の良導体で形成することによって、更なる放熱効果を得ることができる。それは、ＬＥＤ光源２１が載設されたマウント部２２に連接されたリフレクタ５を、例えばアルミニウム合金ダイカスト（ＡＤＣ１２）で形成することにより、ＬＥＤ光源から発せられた熱の一部がリフレクタ５からも放散するようになり、その分放熱効果は向上する。   In addition, the further heat dissipation effect can be acquired by forming the member which comprises the lamp unit 1 with a heat | fever good conductor. For example, the reflector 5 connected to the mount portion 22 on which the LED light source 21 is mounted is formed by, for example, aluminum alloy die casting (ADC 12), so that part of the heat generated from the LED light source is also dissipated from the reflector 5. As a result, the heat dissipation effect is improved accordingly.

ところで、本発明の車両用ＬＥＤ灯具は、車両の走行時にステアリング蛇角、車両速度等から灯具の配光の制御角度を算出し、その算出結果に基づいて灯具の配光の向きを自動制御するＡＦＳ（アダプティブ・フロントライティングシステム）に対応するものであり、図４にその作動状態を示している。   By the way, the vehicle LED lamp according to the present invention calculates the control angle of the light distribution of the lamp from the steering snake angle, the vehicle speed, etc. when the vehicle travels, and automatically controls the direction of the light distribution of the lamp based on the calculation result. This corresponds to AFS (Adaptive Front Lighting System), and FIG. 4 shows the operating state thereof.

図４より、車両走行中に運転者がハンドルを切ると、切った方向、角度等を算出してモータ等からなる駆動機構によって灯具ユニット１のブラケット４に設けられたシャフト部９が回動され、それによって灯具ユニット１がシャフト部９の中心軸Ｘを中心にして向きを変え、車両用ＬＥＤ灯具の配光方向が変わる。   As shown in FIG. 4, when the driver turns the steering wheel while the vehicle is running, the shaft portion 9 provided on the bracket 4 of the lamp unit 1 is rotated by a driving mechanism including a motor by calculating the turning direction and angle. Thereby, the lamp unit 1 changes its direction around the central axis X of the shaft portion 9, and the light distribution direction of the vehicle LED lamp changes.

例えば、走行中の灯具の光軸をＹＣ、カーブに差し掛かってハンドルを切ったときの灯具の光軸をＹＴとすると光軸ＹＣと光軸ＹＴのなす角θだけ光軸の方向が変わり、灯具の配光がカーブの方向を向く。よって、これから向かおうとする方向を明るく照らし出すので進路確認が容易になる。 For example, the optical axis of the lamp in the running Y C, the direction of only the light axis angle θ of the optical axis when the optical axis is Y T lamp Y C and the optical axis Y T when cut handle approaching a curve Will change and the light distribution of the lamp will turn in the direction of the curve. Therefore, since the direction which is going to go ahead is illuminated brightly, course confirmation becomes easy.

上述のように、本発明の車両用ＬＥＤ灯具は、ＬＥＤ光源２１の点灯時に発生してヒートシンク部８に移動した自己発熱を、該ヒートシンク部８の全表面を介して放散させると共に、ヒートシンク部８にＴＩＭを介して面接触するブラケット４に放熱機能を持たせてブラケット４の表面からも、ＬＥＤ光源２１の点灯時の自己発熱を放散するようにした。   As described above, the vehicular LED lamp according to the present invention dissipates the self-heating generated when the LED light source 21 is turned on and moved to the heat sink portion 8 through the entire surface of the heat sink portion 8, and at the same time, the heat sink portion 8. The bracket 4 that is in surface contact with the TIM is provided with a heat dissipation function so that the self-heating when the LED light source 21 is turned on is also dissipated from the surface of the bracket 4.

その結果、ＬＥＤ光源２１を有する灯具ユニット１の放熱性が向上し、ＬＥＤ光源２１の温度上昇が抑制されるによってＬＥＤ光源２１の発光効率の低下が低減されて所定の照射光量を確保することが可能となる。   As a result, the heat dissipation of the lamp unit 1 having the LED light source 21 is improved, and a decrease in the light emission efficiency of the LED light source 21 is reduced by suppressing the temperature rise of the LED light source 21, thereby ensuring a predetermined irradiation light amount. It becomes possible.

また、従来ヒートシンク部８が担っていた放熱量の一部をブラケット４に分担させることができるため、ヒートシンク部８を従来よりも小さくしてヒートシンク部８からの放熱量が少なくなっても、灯具ユニット１全体としては十分な放熱性を確保することが可能となる。   In addition, since a part of the heat radiation amount conventionally carried by the heat sink part 8 can be shared by the bracket 4, even if the heat sink part 8 is made smaller than before and the heat radiation amount from the heat sink part 8 is reduced, the lamp The unit 1 as a whole can ensure sufficient heat dissipation.

そのため、ヒートシンク部８の小型化によって車両用ＬＥＤ灯具の小型化、特に車両に搭載したときに車両の前後方向となる奥行きを短くすることが可能となると共に、車両用ＬＥＤ灯具の軽量化を図ることができる。   Therefore, downsizing of the heat sink portion 8 makes it possible to reduce the size of the vehicle LED lamp, in particular, to shorten the depth in the front-rear direction of the vehicle when mounted on the vehicle, and to reduce the weight of the vehicle LED lamp. be able to.

そこで、灯具全体としての放熱効率を確保しながら小型化、軽量化を実現することができ、灯具の取付け空間および重量に制約が加えられたとしても設計自由度を確保することが可能となる。   Therefore, it is possible to reduce the size and weight while ensuring the heat radiation efficiency of the entire lamp, and it is possible to ensure a degree of design freedom even if restrictions are imposed on the installation space and weight of the lamp.

なお、本実施形態においては、ランプユニット３は３つのプロジェクタランプ２で構成されているが、必ずしもこの構成に限られるものではなく、１つのプロジェクタランプ、２つ以上のプロジェクタランプあるいはプロジェクタランプと他の種類のランプの組み合わせ等の構成でもかまわない。   In the present embodiment, the lamp unit 3 is composed of three projector lamps 2, but is not necessarily limited to this configuration, and one projector lamp, two or more projector lamps, or a projector lamp and others. A configuration such as a combination of various types of lamps may be used.

また、ＬＥＤ光源２１はＬＥＤのベアチップ（ＬＥＤチップ）でもよいし、ＬＥＤチップをパッケージに実装したＬＥＤ装置でもよい。   The LED light source 21 may be an LED bare chip (LED chip) or an LED device in which the LED chip is mounted on a package.

本発明の車両用ＬＥＤ灯具を構成する灯具ユニットの分解立体図である。It is a disassembled three-dimensional view of the lamp unit which comprises the vehicle LED lamp of this invention. 同じく、本発明の車両用ＬＥＤ灯具を構成する灯具ユニットの斜視図である。Similarly, it is a perspective view of a lamp unit constituting the vehicle LED lamp of the present invention. 同じく、本発明の車両用ＬＥＤ灯具の断面図である。Similarly, it is sectional drawing of the LED lamp for vehicles of this invention. 同じく、本発明の車両用ＬＥＤ灯具のＡＦＳの作動を示す模式図である。Similarly, it is a schematic diagram showing the operation of the AFS of the vehicular LED lamp of the present invention. 従来の車両用灯具の断面図である。It is sectional drawing of the conventional vehicle lamp.

符号の説明Explanation of symbols

１ 灯具ユニット
２ プロジェクタランプ
３ ランプユニット
４ ブラケット
５ リフレクタ
６ レンズホルダ
７ 投影レンズ
８ ヒートシンク部
９ シャフト部
１０ ボス部
１１ 窓孔
１２ ＴＩＭ
１３ 全面レンズ
１４ ハウジング
１５ 灯室
１６ シール溝部
１７ シール脚部
１８ シール材
１９ 駆動機構
２０ 支持機構
２１ ＬＥＤ光源
２２ マウント部
２３ 遮蔽体
２４ 車両用ＬＥＤ灯具
２５ 通気孔 DESCRIPTION OF SYMBOLS 1 Lamp unit 2 Projector lamp 3 Lamp unit 4 Bracket 5 Reflector 6 Lens holder 7 Projection lens 8 Heat sink part 9 Shaft part 10 Boss part 11 Window hole 12 TIM
DESCRIPTION OF SYMBOLS 13 Full surface lens 14 Housing 15 Lamp chamber 16 Seal groove part 17 Seal leg part 18 Sealing material 19 Drive mechanism 20 Support mechanism 21 LED light source 22 Mount part 23 Shielding body 24 Vehicle LED lamp 25 Ventilation hole

Claims (3)

少なくとも１つのＬＥＤ光源と、前記ＬＥＤ光源から出射された光の光路を制御する光学系と、前記ＬＥＤ光源で発生した熱を放熱する放熱部材を備えた灯具ユニットが少なくとも前面レンズとハウジングによって形成された灯室内に支持され、前記放熱部材が前記灯具ユニットに備えられたヒートシンク部と前記灯具ユニットに備えられて該灯具ユニットが支持されるブラケットであることを特徴とする車両用ＬＥＤ灯具。   A lamp unit including at least one LED light source, an optical system that controls an optical path of light emitted from the LED light source, and a heat dissipation member that radiates heat generated by the LED light source is formed by at least a front lens and a housing. A vehicular LED lamp comprising: a heat sink provided in the lamp unit; and a heat sink provided in the lamp unit, and a bracket provided in the lamp unit to support the lamp unit. 前記灯具ユニットは前記ブラケットを介して前記灯室内に回動および／または傾動自在に支持されていることを特徴とする請求項１に記載の車両用ＬＥＤ灯具。   2. The vehicular LED lamp according to claim 1, wherein the lamp unit is rotatably and / or tiltably supported in the lamp chamber via the bracket. 前記ＬＥＤ光源はＬＥＤチップ及びＬＥＤチップを備えたＬＥＤ装置のいずれか一方であることを特徴とする請求項１または２のいずれか１項に記載の車両用ＬＥＤ灯具。   3. The vehicular LED lamp according to claim 1, wherein the LED light source is one of an LED chip and an LED device including the LED chip. 4.
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Publication number Priority date Publication date Assignee Title
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JP2004311224A (en) * 2003-04-08 2004-11-04 Koito Mfg Co Ltd Vehicle headlight device
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JP2005186731A (en) * 2003-12-25 2005-07-14 Koito Mfg Co Ltd Lighting fixture for vehicle
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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