JP2006164967A - Vehicular lighting fixture and lamp-lighting device - Google Patents

Vehicular lighting fixture and lamp-lighting device Download PDF

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JP2006164967A
JP2006164967A JP2005326866A JP2005326866A JP2006164967A JP 2006164967 A JP2006164967 A JP 2006164967A JP 2005326866 A JP2005326866 A JP 2005326866A JP 2005326866 A JP2005326866 A JP 2005326866A JP 2006164967 A JP2006164967 A JP 2006164967A
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heat
housing
heat radiating
light source
lighting device
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JP4629558B2 (en
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Nobuhiro Wakabayashi
信弘 若林
Shinobu Yamauchi
忍 山内
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Resonac Holdings Corp
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Showa Denko KK
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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
    • F21V29/51—Cooling arrangements using condensation or evaporation of a fluid, e.g. heat pipes
    • 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
    • F21S41/145—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device the main emission direction of the LED being opposite to the main emission direction 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
    • 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
    • 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]

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular lighting fixture such as a vehicle headlight and a lamp-lighting device enabled to improve its cooling performance. <P>SOLUTION: The lamp-lighting device has a light source made of an LED 21 arranged in a housing 10. A heat receiving part 31 of a loop type heat pipe 30 is thermally connected to the light source, and also, a radiation part 32 is thermally connected on an upper position than the heat receiving part 31 in the housing 10. A connection part of the heat pipe 30 with the radiation part 32 in the housing 10 is structured as a radiation board 41. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

この発明は、光源としてＬＥＤを用いた車両用灯具及び灯火装置に関する。   The present invention relates to a vehicular lamp and a lighting device using an LED as a light source.

従来、車両用前照灯の光源としては、白熱灯、ハロゲンランプ、ＨＩＤランプ（高輝度放電灯）等が多く用いられているが、近年になって、省電力、長寿命等の高性能を有するＬＥＤ（発光ダイオード）を光源とした車両用前照灯が注目されている。   Conventionally, incandescent lamps, halogen lamps, HID lamps (high-intensity discharge lamps), etc. are often used as light sources for vehicle headlamps. Recently, however, high performance such as power saving and long life has been achieved. Vehicle headlamps that use LEDs (light emitting diodes) as light sources have attracted attention.

車両用前照灯は、十分な光束を得るために大電流が用いられ、それに伴い光源から多量の熱が発生する。ところがＬＥＤは耐熱温度が低く、使用できる温度域が制限されている。このため、ＬＥＤを車両用前照灯の光源として用いる場合には、高温域での使用を避けるために、温度管理が重要な要素となる。   A vehicular headlamp uses a large current to obtain a sufficient luminous flux, and accordingly, a large amount of heat is generated from the light source. However, LEDs have a low heat-resistant temperature, and the usable temperature range is limited. For this reason, when the LED is used as a light source for a vehicle headlamp, temperature management is an important factor in order to avoid use in a high temperature range.

このような技術背景の下、下記特許文献１に示す車両用前照灯の冷却装置が提案されている。この車両用前照灯の冷却装置は、ハウジング外側に設けられたヒートシンクと、ハウジング内のＬＥＤ光源とを直管型ヒートパイプによって接続した構造を備え、ＬＥＤ光源から発生する熱を、直管型ヒートパイプによってハウジング外に輸送してヒートシンクを介して放出させるようにしている。こうしてハウジング外に熱を放出することにより、ハウジング内のＬＥＤ周辺に熱が蓄積されるのを防止し、高熱による悪影響を回避するようにしている。
特開２００４−１２７７８２号（請求項１、図１） Under such a technical background, a vehicular headlamp cooling apparatus shown in Patent Document 1 has been proposed. This vehicle headlamp cooling device has a structure in which a heat sink provided outside a housing and an LED light source in the housing are connected by a straight tube heat pipe, and heat generated from the LED light source is converted into a straight tube type. It is transported out of the housing by a heat pipe and discharged through a heat sink. By releasing heat to the outside of the housing in this way, heat is prevented from being accumulated around the LEDs in the housing, and adverse effects due to high heat are avoided.
JP-A No. 2004-127782 (Claim 1, FIG. 1)

しかしながら、特許文献１に示す車両用前照灯の冷却装置では、直管型ヒートパイプを用いるものであるため、車体が傾いてヒートパイプが水平状態になると、ヒートパイプ内に封入される作動流体（熱媒体）の流動性が低下する場合があり、十分な放熱性が得られず冷却性能が低下するという問題を抱えている。   However, since the vehicle headlamp cooling device shown in Patent Document 1 uses a straight pipe heat pipe, when the vehicle body is tilted and the heat pipe becomes horizontal, the working fluid enclosed in the heat pipe There is a case where the fluidity of the (heat medium) is deteriorated, and there is a problem that sufficient heat dissipation is not obtained and the cooling performance is deteriorated.

特にＬＥＤを光源とする車両用前照灯は十分な光束を得るために、ＬＥＤを複数用いるのが通例であり、直管状のヒートパイプに対し複数のＬＥＤの配列位置を調整するのが困難となる。その結果、例えば全てのＬＥＤを均一に冷却できなかったり、あるいはヒートパイプの端部まで作動流体が十分行き渡らない等のショートカットが生じてしまい、所望の温度管理を行えず、この点においても、冷却性能が低下するという問題が発生する。   In particular, vehicle headlamps using LEDs as a light source typically use a plurality of LEDs in order to obtain a sufficient luminous flux, and it is difficult to adjust the arrangement position of the plurality of LEDs with respect to a straight tubular heat pipe. Become. As a result, for example, all LEDs cannot be cooled uniformly, or a shortcut occurs such that the working fluid does not reach the end of the heat pipe sufficiently, and the desired temperature control cannot be performed. There arises a problem that the performance deteriorates.

この発明は、上記従来技術の問題を解消し、冷却性能の向上を図ることができる車両用前照灯等の車両用灯具及び灯火装置を提供することを目的とする。   An object of the present invention is to provide a vehicular lamp such as a vehicular headlamp and a lighting device that can solve the above-described problems of the prior art and improve the cooling performance.

上記目的を達成するため、本発明は以下の構成を要旨とするものである。   In order to achieve the above object, the present invention has the following structure.

［１］ ハウジング内に、ＬＥＤからなる光源が配置された灯火装置であって、
ループ型ヒートパイプが、その受熱部を前記光源に熱的に接続し、かつ放熱部を前記ハウジングにおける前記受熱部よりも上位に熱的に接続した状態に配置され、
前記ハウジングにおける前記ヒートパイプの放熱部との接続部が、放熱板として構成されることを特徴とする灯火装置。 [1] A lighting device in which a light source composed of LEDs is arranged in a housing,
The loop heat pipe is disposed in a state where the heat receiving portion is thermally connected to the light source, and the heat radiating portion is thermally connected to a higher position than the heat receiving portion in the housing,
The lighting device characterized in that a connection portion of the housing with the heat radiating portion of the heat pipe is configured as a heat radiating plate.

［２］ 前記放熱板は、前記ハウジングの一部により構成される前項１に記載の灯火装置。   [2] The lighting device according to item 1, wherein the heat radiating plate is configured by a part of the housing.

［３］ 前記放熱板は、前記ハウジングの全域により構成される前項１に記載の灯火装置。   [3] The lighting device according to item 1, wherein the heat radiating plate is configured by the entire area of the housing.

［４］ 前記放熱板は、前記ハウジングに設けられた開口に嵌め込まれた状態に取り付けられる前項１又は２に記載の灯火装置。   [4] The lighting device according to item 1 or 2, wherein the heat radiating plate is attached in a state of being fitted into an opening provided in the housing.

［５］ 前記放熱板のハウジング外側に放熱フィンが設けられる前項１〜４のいずれか１項に記載の灯火装置。   [5] The lighting device according to any one of items 1 to 4, wherein a heat radiating fin is provided outside the housing of the heat radiating plate.

［６］ 前記光源が、複数のＬＥＤをもって構成される前項１〜５のいずれか１項に記載の灯火装置。   [6] The lighting device according to any one of items 1 to 5, wherein the light source includes a plurality of LEDs.

［７］ 前記複数のＬＥＤが前記ループ型ヒートパイプの受熱部における管部に沿って並んで配置される前項６に記載の灯火装置。   [7] The lighting device according to [6], wherein the plurality of LEDs are arranged side by side along a tube portion in a heat receiving portion of the loop heat pipe.

［８］ 前記光源が、伝熱性を有する光源搭載部材に設置されるとともに、
前記光源搭載部材に前記ヒートパイプの受熱部が取り付けられる前項１〜７のいずれか１項に記載の灯火装置。 [8] The light source is installed on a light source mounting member having heat conductivity,
The lighting device according to any one of the preceding items 1 to 7, wherein a heat receiving portion of the heat pipe is attached to the light source mounting member.

［９］ 前記光源搭載部材が、前記ヒートパイプの受熱部に可動自在に取り付けられる前項８に記載の灯火装置。   [9] The lighting device according to [8], wherein the light source mounting member is movably attached to a heat receiving portion of the heat pipe.

［１０］ 前記ヒートパイプの放熱部が前記放熱板に埋設状態に取り付けられる前項１〜９のいずれか１項に記載の灯火装置。   [10] The lighting device according to any one of the preceding items 1 to 9, wherein the heat radiating portion of the heat pipe is attached to the heat radiating plate in an embedded state.

［１１］ 前項１〜１０のいずれか１項に記載の灯火装置をもって構成されることを特徴とする車両用灯具。   [11] A vehicular lamp comprising the lighting device according to any one of items 1 to 10.

［１２］ 前記ヒートパイプの放熱部が、前記受熱部に対し斜め上方の後部に配置される前項１１に記載の車両用灯具。   [12] The vehicular lamp according to [11], wherein the heat radiating portion of the heat pipe is disposed at a rear portion obliquely above the heat receiving portion.

［１３］ 前項１１又は１２に記載の車両用灯具により構成されることを特徴とする車両用前照灯。   [13] A vehicular headlamp comprising the vehicular lamp according to item 11 or 12.

［１４］ 前記ハウジングの前部に前記透光部が設けられ、前記ハウジングの後部に前記放熱板が設けられる前項１３に記載の車両用前照灯。   [14] The vehicle headlamp according to [13], wherein the light transmitting portion is provided at a front portion of the housing, and the heat sink is provided at a rear portion of the housing.

［１５］ ハウジング内に、ＬＥＤからなる光源が配置された灯火装置であって、
ループ型ヒートパイプが、その受熱部を前記光源に熱的に接続し、かつ放熱部を前記ハウジングの外部における前記受熱部よりも上位に位置させた状態に配置され、
前記ヒートパイプの放熱部に放熱板が取り付けられることを特徴とする灯火装置。 [15] A lighting device in which a light source composed of LEDs is arranged in a housing,
The loop heat pipe is disposed in a state where the heat receiving portion is thermally connected to the light source, and the heat radiating portion is positioned higher than the heat receiving portion outside the housing,
A lighting device, wherein a heat radiating plate is attached to a heat radiating portion of the heat pipe.

［１６］ 前記放熱板は、前記ハウジングの外面に取り付けられる前項１５に記載の灯火装置。   [16] The lighting device according to [15], wherein the heat radiating plate is attached to an outer surface of the housing.

［１７］ 前記放熱板に放熱フィンが設けられる前項１５又は１６に記載の灯火装置。   [17] The lighting device according to the above item 15 or 16, wherein the heat radiating plate is provided with a radiating fin.

［１８］ 前項１５〜１７のいずれか１項に記載の灯火装置をもって構成されることを特徴とする車両用灯具。   [18] A vehicular lamp comprising the lighting device according to any one of 15 to 17 above.

［１９］ 前項１８に記載の車両用灯具により構成されることを特徴とする車両用前照灯。   [19] A vehicular headlamp comprising the vehicular lamp according to item 18 above.

［２０］ ハウジング内に、ＬＥＤからなる光源が配置された灯具の冷却装置であって、
受熱部が前記光源に熱的に接続され、かつ放熱部が前記ハウジングにおける前記受熱部よりも上位に熱的に接続されるループ型ヒートパイプと、
前記ハウジングにおける前記ヒートパイプの放熱部との接続部に設けられた放熱板と、を備えることを特徴とする灯具の冷却装置。 [20] A cooling device for a lamp in which a light source composed of LEDs is disposed in a housing,
A loop heat pipe in which a heat receiving portion is thermally connected to the light source and a heat radiating portion is thermally connected to a higher position than the heat receiving portion in the housing;
A lamp cooling device comprising: a heat radiating plate provided at a connection portion of the housing with the heat radiating portion of the heat pipe.

［２１］ ハウジング内に、ＬＥＤからなる光源が配置された灯具の冷却装置であって、
受熱部が前記光源に熱的に接続され、かつ放熱部が前記ハウジングの外部における前記受熱部よりも上位に配置されたループ型ヒートパイプと、
前記ヒートパイプの放熱部に取り付けられた放熱板と、を備えることを特徴とする灯具の冷却装置。 [21] A lamp cooling device in which a light source composed of LEDs is arranged in a housing,
A loop heat pipe in which a heat receiving portion is thermally connected to the light source, and a heat radiating portion is disposed higher than the heat receiving portion outside the housing;
And a heat sink attached to the heat radiating portion of the heat pipe.

［２２］ ハウジング内に、ＬＥＤからなる光源が配置された灯具の冷却方法であって、
ループ型ヒートパイプを、その受熱部を前記光源に熱的に接続し、かつ放熱部を前記ハウジングにおける前記受熱部よりも上位に熱的に接続し、
前記ヒートパイプの放熱部の熱を、前記ハウジングにおける前記ヒートパイプの放熱部との接続部を介して放出させるようにしたことを特徴とする灯具の冷却方法。 [22] A method for cooling a lamp in which a light source composed of LEDs is arranged in a housing,
A loop heat pipe, the heat receiving portion thereof is thermally connected to the light source, and the heat radiating portion is thermally connected to a higher position than the heat receiving portion in the housing;
The method for cooling a lamp, wherein heat of a heat radiating portion of the heat pipe is released through a connection portion of the housing with the heat radiating portion of the heat pipe.

［２３］ ハウジング内に、ＬＥＤからなる光源が配置された灯具の冷却方法であって、
ループ型ヒートパイプを、その受熱部を前記光源に熱的に接続し、かつ放熱部を前記ハウジングの外部における前記受熱部よりも上位に配置し、
前記ヒートパイプの放熱部の熱を、前記ヒートパイプの放熱部に取り付けられた放熱板を介して放出させるようにしたことを特徴とする灯具の冷却方法。 [23] A method for cooling a lamp in which a light source composed of LEDs is arranged in a housing,
A loop heat pipe, the heat receiving portion thereof is thermally connected to the light source, and the heat radiating portion is disposed above the heat receiving portion outside the housing;
The method for cooling a lamp, wherein heat of a heat radiating portion of the heat pipe is released through a heat radiating plate attached to the heat radiating portion of the heat pipe.

［２４］
前項１３又は１４に記載の車両用前照灯を備えたことを特徴とする車両。 [24]
15. A vehicle comprising the vehicle headlamp according to item 13 or 14.

なお本発明においては、前記ハウジングに投光部が設けられる構成を採用するのが望ましい。   In the present invention, it is desirable to adopt a configuration in which a light projecting portion is provided in the housing.

さらに前記投光部は、たとえばレンズによって構成するのが良い。   Further, it is preferable that the light projecting unit is constituted by a lens, for example.

発明［１］によれば、ループ型のヒートパイプを用いるものであるため、傾いた状態であっても、ヒートパイプ内の作動流体は、両側管部の少なくともいずれか一方を通って、放熱部及び受熱部間をスムーズに移動するので、安定した放熱性を得ることができ、冷却性能を向上させることができる。   According to the invention [1], since the loop type heat pipe is used, the working fluid in the heat pipe passes through at least one of the both side pipe portions even in the inclined state, and the heat radiating portion. And since it moves smoothly between heat-receiving parts, the stable heat dissipation can be obtained and cooling performance can be improved.

更に、複数のＬＥＤを用いる場合には、受熱部の管部に沿って並べて配置することにより、各ＬＥＤから生じる熱を受熱部において均等に吸収でき、全てのＬＥＤをバランス良く均一に冷却できて、一層優れた冷却性能を得ることができる。   Furthermore, when using a plurality of LEDs, by arranging them side by side along the tube portion of the heat receiving portion, the heat generated from each LED can be absorbed evenly in the heat receiving portion, and all LEDs can be cooled in a well-balanced manner. Even better cooling performance can be obtained.

発明［２］によれば、部品点数を削減できる。   According to the invention [2], the number of parts can be reduced.

発明［３］によれば、部品点数を削減できる。   According to the invention [3], the number of parts can be reduced.

発明［４］によれば、小型コンパクト化を図ることができる。   According to the invention [4], a reduction in size and size can be achieved.

発明［５］によれば、冷却性能をより一層向上させることができる。   According to the invention [5], the cooling performance can be further improved.

発明［６］によれば、十分な光束を得ることができる。   According to the invention [6], a sufficient luminous flux can be obtained.

発明［７］［８］によれば、冷却性能を更に向上させることができる。   According to inventions [7] and [8], the cooling performance can be further improved.

発明［９］によれば、照射方向を自在に変更することができる。   According to the invention [9], the irradiation direction can be freely changed.

発明［１０］によれば、冷却性能をより向上させることができる。   According to the invention [10], the cooling performance can be further improved.

発明［１１］によれば、上記と同様の効果を奏する車両用灯具を提供することができる。   According to the invention [11], it is possible to provide a vehicular lamp that achieves the same effects as described above.

発明［１２］によれば、上記の効果をより確実に得ることができる。   According to the invention [12], the above-mentioned effect can be obtained more reliably.

発明［１３］によれば、上記と同様の効果を奏する車両用前照灯を提供することができる。   According to the invention [13], it is possible to provide a vehicular headlamp that exhibits the same effects as described above.

発明［１４］によれば、上記の効果をより確実に得ることができる。   According to the invention [14], the above-mentioned effect can be obtained more reliably.

発明［１５］によれば、上記と同様の効果を奏する灯火装置を提供することができる。   According to the invention [15], it is possible to provide a lighting device that exhibits the same effect as described above.

発明［１６］によれば、上記の効果をより確実に得ることができる。   According to the invention [16], the above-mentioned effect can be obtained more reliably.

発明［１７］によれば、冷却性能を一層向上させることができる。   According to the invention [17], the cooling performance can be further improved.

発明［１８］によれば、上記と同様の効果を奏する車両用灯具を提供することができる。   According to the invention [18], it is possible to provide a vehicular lamp that achieves the same effect as described above.

発明［１９］によれば、上記と同様の効果を奏する車両用前照灯を提供することができる。   According to the invention [19], it is possible to provide a vehicular headlamp that exhibits the same effect as described above.

発明［２１］［２２］によれば、上記と同様の効果を奏する灯具の冷却装置を提供することができる。   According to the inventions [21] and [22], it is possible to provide a lamp cooling device having the same effects as described above.

発明［２２］［２３］によれば、上記同様の効果を奏する灯具の冷却方法を提供することができる。   According to the inventions [22] and [23], it is possible to provide a lamp cooling method that exhibits the same effects as described above.

発明［２４］［２３］によれば、上記同様の効果を奏する車両を提供することができる。   According to the inventions [24] and [23], it is possible to provide a vehicle that exhibits the same effect as described above.

＜第１実施形態＞
図１はこの発明の第１実施形態である車両用前照灯を示す断面図、図２はその車両用前照灯の冷却装置を示す斜視図、図３は同冷却装置の平面図である。 <First Embodiment>
1 is a sectional view showing a vehicle headlamp according to a first embodiment of the present invention, FIG. 2 is a perspective view showing a cooling device for the vehicle headlamp, and FIG. 3 is a plan view of the cooling device. .

これらの図に示すように、本実施形態の車両用前照灯は、ハウジング（１０）と、光源としての複数のＬＥＤ（２１）と、光源搭載部材としてのＬＥＤ設置ブロック（２０）と、冷却装置としてのヒートパイプ（３０）及びヒートシンク（４０）とを基本的な構成要素として備えている。   As shown in these drawings, the vehicle headlamp of this embodiment includes a housing (10), a plurality of LEDs (21) as a light source, an LED installation block (20) as a light source mounting member, and a cooling device. A heat pipe (30) and a heat sink (40) as devices are provided as basic components.

ハウジング（１０）は、合成樹脂やアルミニウム（アルミニウム合金を含む）等の金属によって構成されており、その前面側には、透光性を有する無色又は有色のレンズ（１１）が設けられている。更にハウジング（１０）の後壁上部には、矩形状のベース板嵌込口（１５）が形成されている。なお本実施形態においては、レンズ（１１）によって透光部が構成されている。   The housing (10) is made of a metal such as a synthetic resin or aluminum (including an aluminum alloy), and a colorless or colored lens (11) having translucency is provided on the front side thereof. Further, a rectangular base plate insertion opening (15) is formed on the upper rear wall of the housing (10). In the present embodiment, the translucent part is constituted by the lens (11).

またＬＥＤ設置ブロック（２０）は、横長の直方体形状を有しており、銅等の伝熱性に優れた金属をもって構成されている。このブロック（２０）の一面（後面）に複数のＬＥＤ（２１）が長さ方向（横方向）に沿って等間隔おきに並んで配置された状態に設置されている。   Moreover, the LED installation block (20) has a horizontally long rectangular parallelepiped shape, and is comprised with the metal excellent in heat conductivity, such as copper. A plurality of LEDs (21) are disposed on one surface (rear surface) of the block (20) in a state of being arranged at equal intervals along the length direction (lateral direction).

ヒートシンク（４０）は、放熱板としてのベース板（４１）と、そのベース板（４１）の一面側（外面側）に設けられた多数の放熱フィン（４２）とにより構成されている。   The heat sink (40) includes a base plate (41) as a heat radiating plate and a large number of heat radiating fins (42) provided on one surface side (outer surface side) of the base plate (41).

ベース板（４１）は、上記ハウジング（１０）のベース板嵌込口（１５）に適合し得る矩形状に形成されており、伝熱性に優れたアルミニウム等の金属製押出品や鍛造品をもって構成されている。また放熱フィン（４２）は、伝熱性に優れたアルミニウム等の金属によって構成されている。   The base plate (41) is formed in a rectangular shape that can be adapted to the base plate insertion opening (15) of the housing (10), and is composed of a metal extrudate or forged product such as aluminum having excellent heat conductivity. Has been. Moreover, the radiation fin (42) is comprised with metals, such as aluminum excellent in heat conductivity.

本実施形態において、放熱フィン（４２）は、ベース板（４１）に対し一体に形成しても良く、別体に形成しても良い。更に放熱フィン（４２）としては、プレーンフィンに限られず、スリットフィン、オフセットフィン、ピンフィン等の他のフィンも採用することができる。   In this embodiment, the radiation fin (42) may be formed integrally with the base plate (41) or may be formed separately. Further, the heat dissipating fins (42) are not limited to plain fins, and other fins such as slit fins, offset fins, and pin fins can also be employed.

このヒートシンク（４０）のベース板（４１）がハウジング（１０）のベース板嵌込口（１５）に適合状態に嵌め込まれて固定される。このとき放熱フィン（４２）はハウジング（１０）の外側に配置される。   The base plate (41) of the heat sink (40) is fitted and fixed to the base plate insertion opening (15) of the housing (10). At this time, the radiation fin (42) is disposed outside the housing (10).

なおベース板（４１）の内面側には、ヒートパイプ固定溝（４３）が横方向に沿って形成されている。   A heat pipe fixing groove (43) is formed in the lateral direction on the inner surface side of the base plate (41).

ヒートパイプ（３０）は、外径１０ｍｍのアルミニウム製パイプをもって構成されている。このヒートパイプ（３０）は、横長の長円形状を有し、互いに平行に配置される２本の直管部（３１）（３２）と、両直管部（３１）（３２）の両端部間を連結する半円弧形状の曲管部（３３）（３３）とを有している。   The heat pipe (30) is composed of an aluminum pipe having an outer diameter of 10 mm. This heat pipe (30) has a horizontally long oval shape, and two straight pipe portions (31) (32) arranged in parallel to each other, and both ends of both straight pipe portions (31) (32) It has a semicircular arc shaped curved pipe part (33) (33) which connects between them.

ヒートパイプ（３０）の一方側（下側）の直管部（３１）は、受熱部（蒸発部）として構成されるとともに、他方側（上側）の直管部（３２）は、放熱部（凝縮部）として構成される。更にヒートパイプ（３０）の内部には、その内容積に対し２０〜５０％の割合でフロン等の作動流体が封入されている。そしてこのヒートパイプ（３０）は、受熱部（３１）において液相の作動流体が蒸発することにより熱を吸収し、蒸発した気相の作動流体が両側の曲管部（３３）を通って放熱部（３２）に至り、そこで凝縮して熱を放出する。更に熱の放出により凝縮した液相作動流体は、両側の曲管部（３３）を通って受熱部（３１）へと還流される。このようなサイクルが繰り返されて、受熱部（３１）から放熱部（３２）に熱輸送されるよう構成されている。   The straight pipe part (31) on one side (lower side) of the heat pipe (30) is configured as a heat receiving part (evaporating part), and the straight pipe part (32) on the other side (upper side) is a heat radiating part ( Condensing part). Furthermore, working fluid such as chlorofluorocarbon is sealed in the heat pipe (30) at a ratio of 20 to 50% with respect to its internal volume. The heat pipe (30) absorbs heat when the liquid-phase working fluid evaporates in the heat receiving section (31), and the evaporated gas-phase working fluid dissipates heat through the curved pipe sections (33) on both sides. Part (32), where it condenses and releases heat. Furthermore, the liquid-phase working fluid condensed by the release of heat is returned to the heat receiving part (31) through the curved pipe parts (33) on both sides. Such a cycle is repeated so that heat is transported from the heat receiving portion (31) to the heat radiating portion (32).

なお言うまでもなく、ヒートパイプ（３０）として、その内部にウィックが設けられたものを用いて、液相作動流体の還流を助勢するよう構成しても良い。   Needless to say, a heat pipe (30) having a wick provided therein may be used to assist the reflux of the liquid phase working fluid.

このヒートパイプ（３０）の直管状放熱部（３２）が、上記ヒートシンク（４０）におけるベース板（４１）のヒートパイプ固定溝（４３）内に収納されて、伝熱性コンパウンドや半田等のろう付けによって熱的に接続された状態に固定される。こうして図１及び図４に示すようにヒートパイプ（３０）の直管状放熱部（３２）がベース板（４１）に埋設状態に取り付けられる。このときヒートパイプ（３０）は、直管状受熱部（３１）がハウジング（１０）のほぼ中央に位置し、かつ直管状放熱部（３２）がハウジング（１０）の後壁上部に位置するように後傾姿勢に配置され、受熱部（３１）に対し放熱部（３２）が後方上部に配置される。   The straight tubular heat radiating portion (32) of the heat pipe (30) is accommodated in the heat pipe fixing groove (43) of the base plate (41) in the heat sink (40), and brazing of a heat conductive compound, solder, or the like. Fixed in a thermally connected state. Thus, as shown in FIGS. 1 and 4, the straight tubular heat radiating portion (32) of the heat pipe (30) is attached to the base plate (41) in an embedded state. At this time, the heat pipe (30) has the straight tubular heat receiving portion (31) positioned substantially at the center of the housing (10), and the straight tubular heat radiating portion (32) positioned on the upper rear wall of the housing (10). It arrange | positions at a back leaning attitude | position and a thermal radiation part (32) is arrange | positioned in the rear upper part with respect to a heat receiving part (31).

更にヒートパイプ（３０）の直管状受熱部（３１）が、上記ＬＥＤ設置ブロック（２０）に長さ方向（横方向）に沿って貫通状に配置されることにより、ヒートパイプ（３０）の直管状受熱部（３１）がＬＥＤ設置ブロック（２０）に埋設状態に取り付けられる。このときブロック（２０）上の複数のＬＥＤ（２１）は、後方に向けて配置された状態で、受熱部（３１）の管部に沿って等間隔おきに並んで配置される。   Furthermore, the straight pipe heat receiving part (31) of the heat pipe (30) is arranged in a penetrating manner along the length direction (lateral direction) in the LED installation block (20), so that the heat pipe (30) is directly connected to the heat pipe (30). A tubular heat receiving portion (31) is attached to the LED installation block (20) in an embedded state. At this time, the plurality of LEDs (21) on the block (20) are arranged at regular intervals along the tube portion of the heat receiving portion (31) in a state of being arranged rearward.

またハウジング（１０）内におけるＬＥＤ設置ブロック（２０）の後方には、リフレクタ（１６）が設置されており、ＬＥＤ（２１）を点灯した際に、照射光（Ｌ）がリフレクタ（１６）によって反射されてから、レンズ（１１）を透過して前方に照射されるよう構成されている。   A reflector (16) is installed behind the LED installation block (20) in the housing (10), and when the LED (21) is turned on, the irradiation light (L) is reflected by the reflector (16). After that, the lens (11) is transmitted and irradiated forward.

なお本実施形態においては、ＬＥＤ設置ブロック（２０）は、ヒートパイプ（３０）の受熱部（３１）に熱伝導性グリース等の伝熱性潤滑剤を介して熱的に接続した状態で可動自在に取り付けられており、図示しない光源調整機構によって、ＬＥＤ設置ブロック（２０）の設置角度を調整でき、ＬＥＤ（２１）による照射方向を調整できるよう構成されている。   In this embodiment, the LED installation block (20) is movable in a state where it is thermally connected to the heat receiving portion (31) of the heat pipe (30) via a heat conductive lubricant such as a heat conductive grease. The light source adjustment mechanism (not shown) can be used to adjust the installation angle of the LED installation block (20) and adjust the irradiation direction of the LED (21).

以上の構成を有する本実施形態の車両用前照灯において、ＬＥＤ点灯時に発生する熱は、ヒートパイプ（３０）内の作動流体が気化することによって、ＬＥＤ設置ブロック（２０）を介してヒートパイプ（３０）の受熱部（３１）に吸収される。更に受熱部（３１）で吸熱によって気化した作動流体は、両側曲管部（３３）を通って放熱部（３２）に至り、そこで放熱によって凝縮される。こうしてヒートパイプ（３０）の放熱部（３２）まで輸送されたＬＥＤ（２１）の熱は、ヒートシンク（４０）のベース板（４１）及び放熱フィン（４２）を介して、ハウジング外部に放出される。従ってＬＥＤ（２１）から生じる熱がＬＥＤ周辺に蓄積されることなく、良好な冷却性能を得ることができ、ＬＥＤ（２１）を低温域の適切な温度環境下で使用することができる。   In the vehicle headlamp of the present embodiment having the above-described configuration, the heat generated when the LED is turned on is heat piped through the LED installation block (20) when the working fluid in the heat pipe (30) is vaporized. It is absorbed by the heat receiving part (31) of (30). Furthermore, the working fluid vaporized by heat absorption in the heat receiving portion (31) reaches the heat radiating portion (32) through the both-side curved pipe portions (33), and is condensed there by heat radiation. The heat of the LED (21) thus transported to the heat radiation part (32) of the heat pipe (30) is released to the outside of the housing through the base plate (41) and the heat radiation fin (42) of the heat sink (40). . Accordingly, heat generated from the LED (21) is not accumulated around the LED, and good cooling performance can be obtained, and the LED (21) can be used in an appropriate temperature environment in a low temperature range.

特に本実施形態においては、直管状の受熱部（３１）及び放熱部（３２）の両側に曲管部（３３）（３３）が設けられたループ型のヒートパイプ（３０）を用いるものであるため、車体が傾いた状態であっても、作動流体は、両側曲管部（３３）（３３）の少なくともいずれか一方を通って、放熱部（３２）及び受熱部（３１）間をスムーズに移動するので、安定した放熱性を得ることができ、冷却性能を一層向上させることができる。   In particular, in the present embodiment, a loop-type heat pipe (30) provided with curved pipe portions (33) (33) on both sides of the straight tubular heat receiving portion (31) and the heat radiating portion (32) is used. Therefore, even when the vehicle body is tilted, the working fluid passes between at least one of the curved side pipe parts (33) and (33) and smoothly passes between the heat radiating part (32) and the heat receiving part (31). Since it moves, the stable heat dissipation can be obtained and the cooling performance can be further improved.

更に本実施形態においては、複数のＬＥＤ（２１）を直管状受熱部（３１）に沿って並べて配置するものであるため、各ＬＥＤ（２１）から生じる熱を受熱部（３１）において均等に吸収することができ、全てのＬＥＤ（２１）をバランス良く均一に冷却できて、より一層優れた冷却性能を得ることができる。   Furthermore, in this embodiment, since a plurality of LEDs (21) are arranged side by side along the straight tubular heat receiving part (31), heat generated from each LED (21) is evenly absorbed by the heat receiving part (31). It is possible to cool all the LEDs (21) in a well-balanced manner, and a further excellent cooling performance can be obtained.

また本実施形態においては、ハウジング（１０）の一部にヒートシンク（４０）のベース板（４１）を嵌め込むものであるため、ヒートシンク（４０）の外方突出量を少なくでき、全体として小型コンパクト化を図ることができる。   In this embodiment, since the base plate (41) of the heat sink (40) is fitted into a part of the housing (10), the outward protrusion amount of the heat sink (40) can be reduced, and the overall size and size can be reduced. Can be planned.

＜第２実施形態＞
図５はこの発明の第２実施形態である車両用前照灯を示す断面図である。同図に示すように、この実施形態の車両用前照灯は、そのハウジング（１０）の一部（１２）によってヒートシンク（４０）のベース板（４１）が形成されている。 Second Embodiment
FIG. 5 is a sectional view showing a vehicle headlamp according to a second embodiment of the present invention. As shown in the figure, in the vehicle headlamp of this embodiment, a base plate (41) of a heat sink (40) is formed by a part (12) of the housing (10).

すなわちハウジング（１０）は、伝熱性に優れたアルミニウム等の金属によって構成されており、その後壁上部の一部（１２）がベース板（４１）として構成されている。このベース板（４１）の外面には、伝熱性に優れたアルミニウム等の金属からなる多数の放熱フィン（４２）が形成されている。放熱フィン（４２）は、上記実施形態と同様、ベース板（４１）、つまりハウジング（１０）に対し一体に形成しても良く、別体に形成しても良い。   That is, the housing (10) is made of a metal such as aluminum having excellent heat conductivity, and a part (12) of the upper part of the rear wall is formed as a base plate (41). On the outer surface of the base plate (41), a large number of radiating fins (42) made of a metal such as aluminum having excellent heat conductivity are formed. The radiating fin (42) may be formed integrally with the base plate (41), that is, the housing (10), or may be formed separately, as in the above embodiment.

またベース板（４１）の内面側には、ヒートパイプ固定溝（４３）が横方向に沿って形成されており、この溝（４３）内にヒートパイプ（３０）の放熱部（３２）が固定されている。   Further, a heat pipe fixing groove (43) is formed in the lateral direction on the inner surface side of the base plate (41), and the heat radiating portion (32) of the heat pipe (30) is fixed in the groove (43). Has been.

その他の構成は、上記第１実施形態と同様であるため、同一又は相当部分に同一符号を付して、重複説明は省略する。   Since other configurations are the same as those in the first embodiment, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

この第２実施形態の車両用前照灯においても、上記第１実施形態と同様に、同様の作用効果を得ることができる。   In the vehicular headlamp according to the second embodiment, similar effects can be obtained as in the first embodiment.

特にこの第２実施形態においては、ハウジング（１０）の一部（１２）をベース板（４１）として利用するものであるため、ベース板を別途用いる場合と比較して、部品点数を削減することができ、構造の小型簡素化及びコストの削減を図ることができる。   In particular, in the second embodiment, since a part (12) of the housing (10) is used as the base plate (41), the number of parts can be reduced compared to the case where the base plate is used separately. Thus, the structure can be simplified and the cost can be reduced.

なお本実施形態においては、ハウジング（１０）の一部（１２）をベース板（４１）として形成するようにしているが、それだけに限られず、本発明においては、ハウジング全域をベース板として利用するようにしても良い。   In this embodiment, a part (12) of the housing (10) is formed as the base plate (41). However, the present invention is not limited to this, and in the present invention, the entire housing is used as the base plate. Anyway.

＜第３実施形態＞
図６はこの発明の第３実施形態である車両用前照灯を示す断面図である。同図に示すように、この実施形態の車両用前照灯は、ヒートシンク（４０）のベース板（４１）をハウジング（１０）の外方に配置するものである。 <Third Embodiment>
FIG. 6 is a sectional view showing a vehicle headlamp according to a third embodiment of the present invention. As shown in the figure, the vehicle headlamp of this embodiment has a base plate (41) of a heat sink (40) arranged outside the housing (10).

すなわちハウジング（１０）の後壁上部には、ヒートパイプ（３０）の両側曲管部（３３）（３３）が貫通配置されて、放熱部（３２）がハウジング（１０）の外方に配置される。そしてこの放熱部（３２）が、ヒートシンク（４０）におけるベース板（４１）の裏面側に固定される。   That is, in the upper part of the rear wall of the housing (10), the bent side pipe portions (33) and (33) of the heat pipe (30) are disposed so as to penetrate, and the heat radiating portion (32) is disposed outside the housing (10). The And this thermal radiation part (32) is fixed to the back surface side of the base board (41) in a heat sink (40).

その他の構成は、上記実施形態と同様であるため、同一又は相当部分に同一符号を付して、重複説明は省略する。   Since other configurations are the same as those in the above embodiment, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

この第３実施形態の車両用前照灯においても、上記と同様に、同様の作用効果を得ることができる。   In the vehicular headlamp according to the third embodiment, similar effects can be obtained as described above.

更に本実施形態においては、ヒートシンク（４０）をハウジング外の任意の位置に設置することができ、設計の柔軟性が増し、汎用性を向上させることができる。   Further, in the present embodiment, the heat sink (40) can be installed at an arbitrary position outside the housing, the design flexibility is increased, and the versatility can be improved.

この発明の第１実施形態である車両用前照灯を示す断面図である。It is sectional drawing which shows the vehicle headlamp which is 1st Embodiment of this invention. 第１実施形態の車両用前照灯に適用された冷却装置を示す斜視図である。It is a perspective view which shows the cooling device applied to the vehicle headlamp of 1st Embodiment. 第１実施形態の冷却装置を示す平面図である。It is a top view which shows the cooling device of 1st Embodiment. 第１実施形態の冷却装置におけるヒートパイプの放熱板との接合部を示す断面図である。It is sectional drawing which shows a junction part with the heat sink of the heat pipe in the cooling device of 1st Embodiment. この発明の第２実施形態である車両用前照灯を示す断面図である。It is sectional drawing which shows the vehicle headlamp which is 2nd Embodiment of this invention. この発明の第３実施形態である車両用前照灯を示す断面図である。It is sectional drawing which shows the vehicle headlamp which is 3rd Embodiment of this invention.

符号の説明Explanation of symbols

１０…ハウジング
１１…レンズ（透光部）
１２…ハウジングの一部（放熱板）
２０…ＬＥＤ設置ブロック（光源搭載部材）
２１…ＬＥＤ
３０…ループ型ヒートパイプ
３１…受熱部
３２…放熱部
４１…ベース板（放熱板）
４２…放熱フィン
10 ... Housing 11 ... Lens (translucent part)
12 ... Part of the housing (heat sink)
20 ... LED installation block (light source mounting member)
21 ... LED
30 ... Loop type heat pipe 31 ... Heat receiving part 32 ... Heat radiating part 41 ... Base plate (heat radiating plate)
42 ... Radiating fins

Claims (24)

ハウジング内に、ＬＥＤからなる光源が配置された灯火装置であって、
ループ型ヒートパイプが、その受熱部を前記光源に熱的に接続し、かつ放熱部を前記ハウジングにおける前記受熱部よりも上位に熱的に接続した状態に配置され、
前記ハウジングにおける前記ヒートパイプの放熱部との接続部が、放熱板として構成されることを特徴とする灯火装置。 A lighting device in which a light source composed of LEDs is arranged in a housing,
The loop heat pipe is disposed in a state where the heat receiving portion is thermally connected to the light source, and the heat radiating portion is thermally connected to a higher position than the heat receiving portion in the housing,
The lighting device according to claim 1, wherein a connection portion of the housing with the heat dissipation portion of the heat pipe is configured as a heat dissipation plate. 前記放熱板は、前記ハウジングの一部により構成される請求項１に記載の灯火装置。   The lighting device according to claim 1, wherein the heat radiating plate is configured by a part of the housing. 前記放熱板は、前記ハウジングの全域により構成される請求項１に記載の灯火装置。   The lighting device according to claim 1, wherein the heat radiating plate is configured by an entire area of the housing. 前記放熱板は、前記ハウジングに設けられた開口に嵌め込まれた状態に取り付けられる請求項１又は２に記載の灯火装置。   The lighting device according to claim 1, wherein the heat radiating plate is attached in a state of being fitted into an opening provided in the housing. 前記放熱板のハウジング外側に放熱フィンが設けられる請求項１〜４のいずれか１項に記載の灯火装置。   The lighting device according to any one of claims 1 to 4, wherein a heat radiating fin is provided outside the housing of the heat radiating plate. 前記光源が、複数のＬＥＤをもって構成される請求項１〜５のいずれか１項に記載の灯火装置。   The lighting device according to any one of claims 1 to 5, wherein the light source includes a plurality of LEDs. 前記複数のＬＥＤが前記ループ型ヒートパイプの受熱部における管部に沿って並んで配置される請求項６に記載の灯火装置。   The lighting device according to claim 6, wherein the plurality of LEDs are arranged side by side along a tube portion in a heat receiving portion of the loop heat pipe. 前記光源が、伝熱性を有する光源搭載部材に設置されるとともに、
前記光源搭載部材に前記ヒートパイプの受熱部が取り付けられる請求項１〜７のいずれか１項に記載の灯火装置。 The light source is installed on a light source mounting member having heat conductivity,
The lighting device according to any one of claims 1 to 7, wherein a heat receiving portion of the heat pipe is attached to the light source mounting member. 前記光源搭載部材が、前記ヒートパイプの受熱部に可動自在に取り付けられる請求項８に記載の灯火装置。   The lighting device according to claim 8, wherein the light source mounting member is movably attached to a heat receiving portion of the heat pipe. 前記ヒートパイプの放熱部が前記放熱板に埋設状態に取り付けられる請求項１〜９のいずれか１項に記載の灯火装置。   The lighting device according to any one of claims 1 to 9, wherein a heat radiating portion of the heat pipe is attached to the heat radiating plate in an embedded state. 請求項１〜１０のいずれか１項に記載の灯火装置をもって構成されることを特徴とする車両用灯具。   A vehicle lamp comprising the lighting device according to any one of claims 1 to 10. 前記ヒートパイプの放熱部が、前記受熱部に対し斜め上方の後部に配置される請求項１１に記載の車両用灯具。   The vehicular lamp according to claim 11, wherein a heat radiating portion of the heat pipe is disposed at a rear portion obliquely above the heat receiving portion. 請求項１１又は１２に記載の車両用灯具により構成されることを特徴とする車両用前照灯。   A vehicle headlamp comprising the vehicular lamp according to claim 11. 前記ハウジングの前部に前記透光部が設けられ、前記ハウジングの後部に前記放熱板が設けられる請求項１３に記載の車両用前照灯。   The vehicle headlamp according to claim 13, wherein the translucent portion is provided at a front portion of the housing, and the heat radiating plate is provided at a rear portion of the housing. ハウジング内に、ＬＥＤからなる光源が配置された灯火装置であって、
ループ型ヒートパイプが、その受熱部を前記光源に熱的に接続し、かつ放熱部を前記ハウジングの外部における前記受熱部よりも上位に位置させた状態に配置され、
前記ヒートパイプの放熱部に放熱板が取り付けられることを特徴とする灯火装置。 A lighting device in which a light source composed of LEDs is arranged in a housing,
The loop heat pipe is disposed in a state where the heat receiving portion is thermally connected to the light source, and the heat radiating portion is positioned higher than the heat receiving portion outside the housing,
A lighting device, wherein a heat radiating plate is attached to a heat radiating portion of the heat pipe. 前記放熱板は、前記ハウジングの外面に取り付けられる請求項１５に記載の灯火装置。   The lighting device according to claim 15, wherein the heat radiating plate is attached to an outer surface of the housing. 前記放熱板に放熱フィンが設けられる請求項１５又は１６に記載の灯火装置。   The lighting device according to claim 15 or 16, wherein a heat radiating fin is provided on the heat radiating plate. 請求項１５〜１７のいずれか１項に記載の灯火装置をもって構成されることを特徴とする車両用灯具。   A vehicular lamp comprising the lighting device according to any one of claims 15 to 17. 請求項１８に記載の車両用灯具により構成されることを特徴とする車両用前照灯。   A vehicular headlamp comprising the vehicular lamp according to claim 18. ハウジング内に、ＬＥＤからなる光源が配置された灯具の冷却装置であって、
受熱部が前記光源に熱的に接続され、かつ放熱部が前記ハウジングにおける前記受熱部よりも上位に熱的に接続されるループ型ヒートパイプと、
前記ハウジングにおける前記ヒートパイプの放熱部との接続部に設けられた放熱板と、を備えることを特徴とする灯具の冷却装置。 A lamp cooling device in which a light source composed of LEDs is disposed in a housing,
A loop heat pipe in which a heat receiving part is thermally connected to the light source and a heat radiating part is thermally connected to a higher position than the heat receiving part in the housing;
A lamp cooling device comprising: a heat radiating plate provided at a connection portion of the housing with the heat radiating portion of the heat pipe. ハウジング内に、ＬＥＤからなる光源が配置された灯具の冷却装置であって、
受熱部が前記光源に熱的に接続され、かつ放熱部が前記ハウジングの外部における前記受熱部よりも上位に配置されたループ型ヒートパイプと、
前記ヒートパイプの放熱部に取り付けられた放熱板と、を備えることを特徴とする灯具の冷却装置。 A lamp cooling device in which a light source composed of LEDs is disposed in a housing,
A loop heat pipe in which a heat receiving portion is thermally connected to the light source, and a heat radiating portion is disposed higher than the heat receiving portion outside the housing;
And a heat sink attached to the heat radiating portion of the heat pipe. ハウジング内に、ＬＥＤからなる光源が配置された灯具の冷却方法であって、
ループ型ヒートパイプを、その受熱部を前記光源に熱的に接続し、かつ放熱部を前記ハウジングにおける前記受熱部よりも上位に熱的に接続し、
前記ヒートパイプの放熱部の熱を、前記ハウジングにおける前記ヒートパイプの放熱部との接続部を介して放出させるようにしたことを特徴とする灯具の冷却方法。 A method for cooling a lamp in which a light source composed of LEDs is arranged in a housing,
A loop heat pipe, the heat receiving portion thereof is thermally connected to the light source, and the heat radiating portion is thermally connected to a higher position than the heat receiving portion in the housing;
The method for cooling a lamp, wherein heat of a heat radiating portion of the heat pipe is released through a connection portion of the housing with the heat radiating portion of the heat pipe. ハウジング内に、ＬＥＤからなる光源が配置された灯具の冷却方法であって、
ループ型ヒートパイプを、その受熱部を前記光源に熱的に接続し、かつ放熱部を前記ハウジングの外部における前記受熱部よりも上位に配置し、
前記ヒートパイプの放熱部の熱を、前記ヒートパイプの放熱部に取り付けられた放熱板を介して放出させるようにしたことを特徴とする灯具の冷却方法。 A method for cooling a lamp in which a light source composed of LEDs is arranged in a housing,
A loop heat pipe, the heat receiving portion thereof is thermally connected to the light source, and the heat radiating portion is disposed above the heat receiving portion outside the housing;
The method for cooling a lamp, wherein heat of a heat radiating portion of the heat pipe is released through a heat radiating plate attached to the heat radiating portion of the heat pipe. 請求項１３又は１４に記載の車両用前照灯を備えたことを特徴とする車両。   A vehicle comprising the vehicle headlamp according to claim 13 or 14.
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