JP2007220618A - Vehicular led lighting fixture - Google Patents

Vehicular led lighting fixture Download PDF

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Publication number
JP2007220618A
JP2007220618A JP2006042726A JP2006042726A JP2007220618A JP 2007220618 A JP2007220618 A JP 2007220618A JP 2006042726 A JP2006042726 A JP 2006042726A JP 2006042726 A JP2006042726 A JP 2006042726A JP 2007220618 A JP2007220618 A JP 2007220618A
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Prior art keywords
heat sink
heat
lamp
light source
led
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JP2006042726A
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Japanese (ja)
Inventor
Maki Takase
真樹 高瀬
Toshiyuki Nagasawa
理之 長澤
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Stanley Electric Co Ltd
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Stanley Electric Co Ltd
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Priority to JP2006042726A priority Critical patent/JP2007220618A/en
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    • 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
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F21V29/763—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section the planes containing the fins or blades having the direction of the light emitting 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]
    • F21S41/147—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
    • 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
    • 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
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • 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
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F21V29/767—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section the planes containing the fins or blades having directions perpendicular to the light emitting axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

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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

<P>PROBLEM TO BE SOLVED: To provide a vehicular LED lighting fixture that suppresses a temperature rise in LEDs by increasing the heat radiation properties of the self heat generation of the LEDs and securing a prescribed quantity of light irradiation by reducing a decrease in luminous efficiency in the LEDs in the vehicular LED lighting fixture with the LEDs as a light source. <P>SOLUTION: A front lens 1, a housing 2, and a fixed radiator 3 form a lamp chamber 4. In the fixed radiator 3, a first heat sink section 10 and a second one 11 are positioned inside and outside the lamp chamber 4, respectively. Further, a lighting fixture 12, having an optical system that supports an LED light source 16 and comprises a reflector 18, a projection lens 21, and the like, and a third heat sink section 13, is supported in the lamp chamber 4 so that aiming can be adjusted via an aiming screw 22. Heat generated from the LED light source 16 is radiated to the atmosphere from a radiating fin 23 in the second heat sink section 11 successively through a third heat sink section 13 and the first one 10. <P>COPYRIGHT: (C)2007,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.

発光ダイオード（以下、「ＬＥＤ」と称する）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、ＬＥＤの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。   A light emitting diode (hereinafter referred to as “LED”) has a characteristic that the light emission efficiency is lowered by a temperature rise. Possible causes of LED temperature rise include self-heating when the LED is turned on 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・開発もなされている。   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, vehicle headlamps using LEDs as light sources have been proposed and developed.

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構成された灯具の内部（灯室内）が密閉環境として形成されており、灯室内に支持されたＬＥＤを点灯すると、ＬＥＤの自己発熱と該自己発熱による灯室内の温度上昇分との相乗作用によってＬＥＤ自体の温度が著しく上昇し、その結果ＬＥＤの発光効率が低下することによって灯具の照射光量が低減すると共に、極端な場合には灯具に要求される配光性能や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 is formed in a hermetically sealed environment (light chamber) formed by a front lens and a housing. When an LED supported in the lamp chamber is turned on, the self-heating of the LED and the self The temperature of the LED itself increases significantly due to a synergistic effect with the temperature rise in the lamp chamber due to heat generation. As a result, the light emission efficiency of the LED decreases, and the amount of light emitted from the lamp decreases. There is also a possibility that the light distribution performance and the light distribution standard will not be satisfied.

また、灯室内の温度がＬＥＤの動作温度範囲の定格よりも高くなるとＬＥＤの点灯が不可能となり、灯具としての機能を果すことができなくなる場合もある。   Further, when the temperature in the lamp chamber becomes higher than the rating of the operating temperature range of the LED, the LED cannot be turned on, and the function as a lamp may not be achieved.

そこで、上記問題の発生を抑制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４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、ユニット支持部５４及びヒートシンク部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。   Accordingly, proposals have been made for vehicle headlamps that suppress the occurrence of the above problems. As shown in FIG. 4, the vehicle head includes a transparent cover 51, a lamp body 52, a vertical panel 53, a support bracket 56 in which a unit support 54 and a heat sink 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.

上記構成の、半導体発光素子５９を光源とする車両用前照灯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 semiconductor light emitting element 59 as a light source having the above-described configuration, the self-heating when the semiconductor light emitting element 59 is turned on is a unit support portion of the support bracket 56 formed of a material that is a good conductor of heat. The heat is transferred from 54 to the heat sink portion 55 and is moved to the outside of 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、ランプボディ５２と支持ブラケット５６のヒートシンク部５５とが柔軟性を有する材料で形成されたソケットカバー５７を介して連結されており、エイミング調整で支持ブラケット５６が傾動したときに、その傾動による変位でソケットカバー５７が変形して変位を吸収し、固定されたランプボディ５２には変位力が加わらないような構成となっている。   In the conventional vehicle headlamp 50, the lamp body 52 and the heat sink portion 55 of the support bracket 56 are connected via a socket cover 57 formed of a flexible material. When 56 is tilted, the socket cover 57 is deformed by the displacement due to the tilt and absorbs the displacement, so that no displacement force is applied to the fixed lamp body 52.

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、従来の車両用前照灯５０の場合、ソケットカバー５７があることによってヒートシンク部５５の配置範囲が該ソケットカバー５７によって限定されることになる。そのため、ヒートシンク部５５の大きさに制約が加わるために十分な放熱効率が得られないものとなっている。   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, in the case of the conventional vehicle headlamp 50, the socket cover 57 allows the heat sink portion 55 to be disposed within the socket cover 57. It will be limited. Therefore, since the size of the heat sink portion 55 is restricted, sufficient heat radiation 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、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 temperature of the LED by increasing the heat dissipation of the LED's self-heating in a 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 a decrease in light emission efficiency of an LED and can secure a predetermined irradiation light amount.

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、少なくとも前面レンズと、ハウジングと、該ハウジングと互いに直接接触した状態で連結された固定放熱体とによって灯室が形成され、前記固定放熱体の第一のヒートシンク部が前記灯室の内部に、第二のヒートシンク部が前記灯室の外部に夫々位置しており、
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第三のヒートシンク部とを備えた灯具ユニットが前記灯室の内部に支持されていることを特徴とするものである。 In order to solve the above-mentioned problems, in the invention described in claim 1 of the present invention, a lamp chamber is formed by at least a front lens, a housing, and a fixed radiator that is connected to the housing in direct contact with each other. The first heat sink part of the fixed radiator is located inside the lamp chamber, and the second heat sink part is located outside the lamp chamber,
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 third heat sink is supported in the lamp chamber. Is.

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、前記第一のヒートシンク部は前記第三のヒートシンク部の上方に位置し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 first heat sink part is located above the third heat sink part.

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、前記灯具ユニットはエイミング機構によって傾動可能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 3 of the present invention is characterized in that, in any one of claims 1 and 2, the lamp unit is supported to be tiltable by an aiming mechanism.

本発明の車両用ＬＥＤ灯具は、少なくとも前面レンズとハウジングと該ハウジングと互いに面接触した状態で連結された固定放熱体とによって灯室を形成し、固定放熱体の第一のヒートシンク部を灯室の内部に、第二のヒートシンク部を灯室の外部に位置させ、ＬＥＤ光源で発生した熱が、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第三のヒートシンク部とを備えた灯具ユニットの第三のヒートシンク部および第一のヒートシンク部を順次経て第二のヒートシンク部の放熱フィンから大気中に放散されるようにした。   The LED lamp for a vehicle of the present invention forms a lamp chamber by at least a front lens, a housing, and a fixed heat radiating body connected in a state of surface contact with the housing, and the first heat sink portion of the fixed heat radiating member is used as the lamp chamber. The second heat sink part is located outside the lamp chamber, and the heat generated by the LED light source controls the light path of the light emitted from the LED light source, the LED light source, and the third heat sink part. The lamp unit is provided with a third heat sink part and a first heat sink part in order, and the heat radiation fins of the second heat sink part are diffused into the atmosphere.

その結果、灯室外に位置してＬＥＤ光源で発生した熱を大気中に放散する固定発熱体の第二のヒートシンクの大きさをハウジングの外周寸法近傍まで大きくすることが可能となり、第二のヒートシンク部の放熱フィン全表面の放熱面積が拡大することによって放熱効率が高まり、ＬＥＤ光源の温度上昇が抑制されて発光効率の低下を低減することができるようになった。   As a result, it is possible to increase the size of the second heat sink of the fixed heating element that is located outside the lamp chamber and dissipates the heat generated by the LED light source to the atmosphere, up to the vicinity of the outer periphery of the housing. The heat radiation efficiency is increased by expanding the heat radiation area of the entire surface of the heat radiating fins, the temperature rise of the LED light source is suppressed, and the decrease in light emission efficiency can be reduced.

以下、この発明の好適な実施形態を図１から図３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 3 (the same reference numerals are used for 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灯具に係わる実施形態を示す断面図である。本実施形態は、主に前面レンズ１、ハウジング２及び固定放熱体３の３つの部材によって灯室４が形成されている。前面レンズ１とハウジング２は、ハウジング２の一方の前面開口端部に設けられたシール溝部５に前面レンズ１の周端に設けられたシール脚部６を挿入し、シール溝部５とシール脚部６との隙間に弾性シール材７を充填した状態で係止されている。   FIG. 1 is a cross-sectional view showing an embodiment according to a vehicle LED lamp of the present invention. In this embodiment, the lamp chamber 4 is mainly formed by three members, that is, the front lens 1, the housing 2, and the fixed heat radiating body 3. In the front lens 1 and the housing 2, a seal leg 6 provided at the peripheral end of the front lens 1 is inserted into a seal groove 5 provided at one front opening end of the housing 2, and the seal groove 5 and the seal leg are inserted. 6 is locked in a state in which the elastic sealing material 7 is filled in a gap with the gap 6.

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 configured by the housing and the housing, the structure of the locking portions, the locking means, and the like are not particularly limited.

ハウジング２と固定放熱体３は、ハウジング２の他方の前面開口端部２４と固定放熱体３のフランジ部８とが互いの面を接触させた状態で連結ネジ９を介して連結固定されている。   The housing 2 and the fixed heat radiating body 3 are connected and fixed via a connecting screw 9 with the other front opening end 24 of the housing 2 and the flange portion 8 of the fixed heat radiating body 3 in contact with each other. .

固定放熱体３は上記フランジ部８と共に、第一のヒートシンク部１０と第二のヒートシンク部１１とが一体化されており、第一のヒートシンク部１０は灯室４内に、第二のヒートシンク部１１は灯室４外に夫々位置している。つまり、固定放熱体３の一部は灯室４内に、一部は灯室４外に夫々突出していることになる。   The fixed heat radiating body 3 is integrated with the flange portion 8 together with the first heat sink portion 10 and the second heat sink portion 11, and the first heat sink portion 10 is provided in the lamp chamber 4 with the second heat sink portion. 11 are respectively located outside the lamp chamber 4. That is, a part of the fixed heat radiating body 3 protrudes inside the lamp chamber 4 and a part protrudes outside the lamp chamber 4.

更に、灯室４内には灯具ユニット１２が支持されており、該灯具ユニット１２には第三のヒートシンク部１３と、該第三のヒートシンク部１３を挟むように支持された、スライドナット１４が設けられたサポートプレート１５及びＬＥＤ光源１６が載設されたマウントプレート１７と、リフレクタ１８と、遮蔽体１９と、レンズホルダ２０と、投影レンズ２１とが備えられている。   Further, a lamp unit 12 is supported in the lamp chamber 4. A third heat sink part 13 and a slide nut 14 supported so as to sandwich the third heat sink part 13 are sandwiched between the lamp unit 12 and the lamp unit 12. A mount plate 17 on which the provided support plate 15 and the LED light source 16 are mounted, a reflector 18, a shield 19, a lens holder 20, and a projection lens 21 are provided.

また、スライドナット１４には頭部が固定放熱体３に支持されたエイミングネジ２２が螺合されており、エイミングネジ２２を回動することによって、図２に示すように灯具ユニット１２を所望の方向に傾動してエイミング調整を行なうことができるようになっている。   Further, an aiming screw 22 whose head is supported by the fixed heat radiating body 3 is screwed onto the slide nut 14. By rotating the aiming screw 22, the lamp unit 12 can be mounted in a desired manner as shown in FIG. 2. The aiming adjustment can be performed by tilting in the direction.

上記構成の車両用ＬＥＤ灯具は、ＬＥＤ光源１６を点灯すると、ＬＥＤ光源から発せられた光が上記リフレクタ１８と、遮蔽体１９と、レンズホルダ２０と、投影レンズ２１とで構成された光学系を介して前面レンズ１から車両用ＬＥＤ灯具の前方に照射される。   When the LED light source for a vehicle having the above-described configuration is turned on, the light emitted from the LED light source has an optical system including the reflector 18, the shield 19, the lens holder 20, and the projection lens 21. Through the front lens 1, the light is irradiated in front of the vehicle LED lamp.

それと共に、「背景技術」に記載したように、ＬＥＤ光源は点灯時に自己発熱する。そのため、ＬＥＤ光源の該自己発熱と、その熱で加熱されて温度上昇した灯室４内の空気との熱の重畳作用によってＬＥＤ光源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 self-heats when turned on. Therefore, the temperature of the LED light source itself rises due to the superimposing action of the self-heating of the LED light source and the heat in the air in the lamp chamber 4 heated by the heat, and the luminous efficiency of the LED decreases. As a result, the amount of light emitted from the lamp is reduced.

そこで、本発明においては、ＬＥＤ光源の点灯時の温度上昇を抑制する手段が施されているので、図３に基づいて詳細に説明する。   Therefore, in the present invention, means for suppressing the temperature rise when the LED light source is turned on is provided, and will be described in detail with reference to FIG.

まず、ＬＥＤ光源１６が点灯するとＬＥＤ光源１６で発生した熱はＬＥＤ光源１６が載設されたマウントプレート１７に移動する。マウントプレート１７は熱の良導体である材料によって形成されており、ＬＥＤ光源１６からマウントプレート１７に移動した熱はマウントプレート１７内部を伝導されて第三のヒートシンク部１３に移動する。   First, when the LED light source 16 is turned on, the heat generated by the LED light source 16 moves to the mount plate 17 on which the LED light source 16 is mounted. The mount plate 17 is made of a material that is a good heat conductor, and the heat transferred from the LED light source 16 to the mount plate 17 is conducted through the mount plate 17 and moves to the third heat sink portion 13.

第三のヒートシンク部１３も熱の良導体である材料で形成されており、互いに所定の間隔をおいて平行に配置された複数の放熱フィン２３を備えた形状を有している。そこで、第三のヒートシンク部１３に移動した熱は第三のヒートシンク部１３内部を伝導されて各放熱フィン２３まで伝導される。   The third heat sink portion 13 is also formed of a material that is a good heat conductor, and has a shape including a plurality of heat radiation fins 23 arranged in parallel at a predetermined interval. Therefore, the heat transferred to the third heat sink portion 13 is conducted through the third heat sink portion 13 and is conducted to the heat radiating fins 23.

各放熱フィン２３に到達した熱は、夫々の放熱フィン２３の表面近傍の空気に熱伝達されて移動する。第三のヒートシンク部１３の上方には同様に熱の良導体である材料で形成された固定放熱体３の第一のヒートシンク部１０が位置しており、第三のヒートシンク部１３の各放熱フィン２３の表面から空気へ熱伝達された熱は上昇した該空気を介して第一のヒートシンク部１０の各放熱フィン２３の表面から内部に熱伝達される。   The heat reaching each radiation fin 23 is transferred to the air near the surface of each radiation fin 23 and moved. Above the third heat sink part 13, the first heat sink part 10 of the fixed heat radiating body 3 formed of a material that is also a good heat conductor is located, and each heat radiation fin 23 of the third heat sink part 13 is located. The heat transferred from the surface to the air is transferred from the surface of each radiation fin 23 of the first heat sink portion 10 to the inside through the raised air.

第一のヒートシンク部１０の各放熱フィン２３の表面から内部に熱伝達された熱は、各放熱フィン２３内部を伝導されて灯室外に位置する第二のヒートシンク部１１に移動し、各放熱フィン２３まで伝導される。   The heat transferred from the surface of each radiating fin 23 of the first heat sink part 10 to the inside is transferred to the second heat sink part 11 located outside the lamp chamber through the inside of each radiating fin 23, and each radiating fin. Conducted up to 23.

第二のヒートシンク部１１の各放熱フィン２３に到達した熱は、夫々の放熱フィン２３の表面近傍の空気に熱伝達されて移動する。そして、第二のヒートシンク部１１の各放熱フィン２３の表面から空気へ熱伝達された熱は、該空気を介して大気中に放散される。   The heat that has reached each radiating fin 23 of the second heat sink portion 11 is transferred to the air in the vicinity of the surface of each radiating fin 23 and moves. Then, the heat transferred from the surface of each radiating fin 23 of the second heat sink portion 11 to the air is dissipated into the atmosphere via the air.

以上、本発明の車両用ＬＥＤ灯具の構成において、ＬＥＤ光源１６で発生して灯室４外に位置する第二のヒートシンク部１１の放熱フィン２３から大気中に放散されるまでの熱の流れについて説明してきたが、その他に、第三のヒートシンク部１３及び第一のヒートシシンク部１０の夫々の放熱フィン２３の表面から近傍の空気へ熱伝達された熱の一部は、該空気を介してハウジング２に熱伝達され、ハウジング２内を伝導されてハウジング２に面接触した固定放熱体３のフランジ部８に移動し、その後上記熱の流れに沿って第二のヒートシンク部１１の放熱フィン２３から大気中に放散される。   As described above, in the configuration of the vehicle LED lamp according to the present invention, the flow of heat from the LED light source 16 until it is dissipated into the atmosphere from the radiation fins 23 of the second heat sink 11 located outside the lamp chamber 4. As described above, in addition, a part of the heat transferred from the surfaces of the radiation fins 23 of the third heat sink portion 13 and the first heat sink portion 10 to the nearby air is transmitted through the air. The heat is transferred to the housing 2 and is transferred to the flange portion 8 of the fixed heat dissipating body 3 which is conducted through the housing 2 and is in surface contact with the housing 2, and then the heat dissipating fins 23 of the second heat sink portion 11 along the heat flow. From the atmosphere.

よって、本発明の車両用ＬＥＤ灯具においては、ＬＥＤ光源１６で発生した熱は主に、順次第三のヒートシンク部１３、第一のヒートシンク部１０、第二のヒートシンク部１１を経て大気中に放散される流れと、順次第三のヒートシンク部１３及び第一のヒートシンク部１０、ハウジング２、第二のヒートシンク部１１を経て大気中に放散される流れとの２つの流れが形成される。   Therefore, in the vehicular LED lamp according to the present invention, the heat generated by the LED light source 16 is dissipated into the atmosphere mainly through the third heat sink portion 13, the first heat sink portion 10, and the second heat sink portion 11 sequentially. Two flows are formed, that is, a flow dissipated into the atmosphere through the third heat sink portion 13, the first heat sink portion 10, the housing 2, and the second heat sink portion 11.

以上説明したように、本発明の車両用ＬＥＤ灯具は、発光源と同時に発熱源となるＬＥＤ光源を支持する灯具ユニットはエイミング時に所望の方向に傾動してエイミング調整を行なうことができるように灯室内に支持されており、ＬＥＤ光源で発生した熱を最終的に大気中に放散する固定放熱体はハウジングに対して面接触によって直接連結固定されている。従って、従来例で示したようなハウジングと固定放熱体とを連結するソケットカバーのような連結部材は不要である。   As described above, the vehicular LED lamp according to the present invention is designed so that the lamp unit that supports the LED light source that is the heat generation source simultaneously with the light emitting source can be tilted in a desired direction at the time of aiming to perform aiming adjustment. A fixed heat radiating body, which is supported indoors and finally dissipates heat generated by the LED light source into the atmosphere, is directly connected and fixed to the housing by surface contact. Therefore, a connecting member such as a socket cover for connecting the housing and the fixed heat dissipator as shown in the conventional example is unnecessary.

従って、灯室外に位置してＬＥＤ光源で発生する熱を大気中に放散する固定発熱体の第二のヒートシンク部の寸法を大きくすることが可能となり、第二のヒートシンク部の放熱フィン全表面の放熱面積が拡大することによって放熱効率が高まり、ＬＥＤ光源の温度上昇が抑制されて発光効率の低下を低減することができる。   Therefore, it is possible to increase the size of the second heat sink part of the fixed heat generating element that is located outside the lamp room and dissipates heat generated by the LED light source into the atmosphere, The heat dissipation area is increased, so that the heat dissipation efficiency is increased, the temperature rise of the LED light source is suppressed, and the decrease in the light emission efficiency can be reduced.

また、第三のヒートシンク部及び第一のヒートシシンク部の夫々の放熱フィンの表面から近傍の空気へ熱伝達された熱の一部は、ハウジングに熱伝達されて第二のヒートシンク部の放熱フィンから大気中に放散されることになり、更なる放熱効率の向上に寄与するものである。   In addition, a part of the heat transferred from the surfaces of the heat sink fins of the third heat sink part and the first heat sink part to the nearby air is transferred to the housing, and the heat sink fins of the second heat sink part. Will be dissipated into the atmosphere and contribute to further improvement in heat dissipation efficiency.

なお、本実施例においては、ＬＥＤ光源を載設するマウントプレート、スライドナットが設けられたサポートプレート及び第三のヒートシンク部は夫々個別に形成されたものであるが、マウントプレート及びサポートプレートのどちらか一方または両方を第三のヒートシンク部と一体に形成することも可能である。   In this embodiment, the mount plate for mounting the LED light source, the support plate provided with the slide nut, and the third heat sink are individually formed. One or both of them can be formed integrally with the third heat sink portion.

また、第一のヒートシンク部、第二のヒートシンク部及び第三のヒートシンク部の夫々に形成された放熱フィンの形状、寸法は、配設可能なスペース、放熱効率などの諸々の条件を考慮して設定される。   In addition, the shape and size of the radiation fins formed on the first heat sink part, the second heat sink part and the third heat sink part take into consideration various conditions such as the space where the heat sink can be arranged and the heat radiation efficiency. Is set.

本発明の車両用ＬＥＤ灯具の断面図である。It is sectional drawing of the LED lamp for vehicles of this invention. 同じく、本発明の車両用ＬＥＤ灯具のエイミングを示す部分断面図である。Similarly, it is a fragmentary sectional view showing aiming of the LED lamp for vehicles of the present invention. 同じく、本発明の車両用ＬＥＤ灯具の熱移動の過程を示す参考図である。Similarly, it is a reference view showing the process of heat transfer of the LED lamp for vehicles 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 前面レンズ
２ ハウジング
３ 固定放熱体
４ 灯室
５ シール溝部
６ シール脚部
７ シール材
８ フランジ部
９ 連結ネジ
１０ 第一のヒートシンク部
１１ 第二のヒートシンク部
１２ 灯具ユニット
１３ 第三のヒートシンク部
１４ スライドナット
１５ サポートプレート
１６ ＬＥＤ光源
１７ マウントプレート
１８ リフレクタ
１９ 遮光体
２０ レンズホルダ
２１ 投影レンズ
２２ エイミングネジ
２３ 放熱フィン
２４ 前面開口端部 DESCRIPTION OF SYMBOLS 1 Front lens 2 Housing 3 Fixed heat radiator 4 Lamp chamber 5 Seal groove part 6 Seal leg part 7 Seal material 8 Flange part 9 Connection screw 10 1st heat sink part 11 2nd heat sink part 12 Lamp unit 13 3rd heat sink part 14 Slide nut 15 Support plate 16 LED light source 17 Mount plate 18 Reflector 19 Light shield 20 Lens holder 21 Projection lens 22 Aiming screw 23 Radiation fin 24 Front opening end

Claims (3)

少なくとも前面レンズと、ハウジングと、該ハウジングと互いに直接接触した状態で連結された固定放熱体とによって灯室が形成され、前記固定放熱体の第一のヒートシンク部が前記灯室の内部に、第二のヒートシンク部が前記灯室の外部に夫々位置しており、
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第三のヒートシンク部とを備えた灯具ユニットが前記灯室の内部に支持されていることを特徴とする車両用ＬＥＤ灯具。 A lamp chamber is formed by at least the front lens, the housing, and a fixed heat radiating body connected to the housing in direct contact with each other, and a first heat sink portion of the fixed heat radiating member is disposed inside the lamp chamber. Two heat sink parts are respectively located outside the lamp chamber,
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 third heat sink is supported in the lamp chamber. LED lighting for vehicles. 前記第一のヒートシンク部は前記第三のヒートシンク部の上方に位置し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 first heat sink portion is located above the third heat sink portion. 前記灯具ユニットはエイミング機構によって傾動可能に支持されてい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。   The vehicular LED lamp according to claim 1, wherein the lamp unit is tiltably supported by an aiming mechanism.
JP2006042726A 2006-02-20 2006-02-20 Vehicular led lighting fixture Pending JP2007220618A (en)

Priority Applications (1)

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Country Link
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JP2009076323A (en) * 2007-09-20 2009-04-09 Koito Mfg Co Ltd Vehicular lighting fixture
JP2009259654A (en) * 2008-04-18 2009-11-05 Stanley Electric Co Ltd Vehicular lighting fixture
JP2009283406A (en) * 2008-05-26 2009-12-03 Panasonic Electric Works Co Ltd Vehicular headlamp device
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JP2010146817A (en) * 2008-12-17 2010-07-01 Koito Mfg Co Ltd Vehicle lamp
WO2010087877A1 (en) * 2009-01-28 2010-08-05 Relume Technologies, Inc. Led light engine with finned modules for heat transfer
US8632210B2 (en) 2009-01-28 2014-01-21 Relume Technologies, Inc. LED engine of finned boxes for heat transfer
JP2011119094A (en) * 2009-12-02 2011-06-16 Koito Mfg Co Ltd Lighting fixture for vehicle
JP2011129282A (en) * 2009-12-16 2011-06-30 Toyoda Gosei Co Ltd Light source unit
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EP2532949A3 (en) * 2011-06-07 2013-03-20 Valeo Vision Lighting and/or signalling device with built-in radiator and heat sink
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US10113702B2 (en) 2012-12-04 2018-10-30 Koito Manufacturing Co., Ltd. Vehicle lighting apparatus
JP2014225411A (en) * 2013-05-17 2014-12-04 三菱電機株式会社 On-vehicle headlight
WO2015025945A1 (en) * 2013-08-23 2015-02-26 株式会社小糸製作所 Lamp device for vehicle and lighting device for vehicle
US9970624B2 (en) 2013-08-23 2018-05-15 Koito Manufacturing Co., Ltd. Lamp device for vehicle and lighting device for vehicle
US10434928B2 (en) 2013-08-23 2019-10-08 Koito Manufacturing Co., Ltd. Lamp device for vehicle and lighting device for vehicle
EP2863106A1 (en) * 2013-10-18 2015-04-22 Hella Saturnus Slovenija, Proizvodnja svetlobne opreme za motorna in druga vozila, d.o.o. Motor vehicle light with improved heat transfer
FR3012575A1 (en) * 2013-10-24 2015-05-01 Peugeot Citroen Automobiles Sa COMPACT OPTICAL MODULE FOR VEHICLE

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