JP2008198483A - Vehicle headlight - Google Patents

Vehicle headlight Download PDF

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JP2008198483A
JP2008198483A JP2007032392A JP2007032392A JP2008198483A JP 2008198483 A JP2008198483 A JP 2008198483A JP 2007032392 A JP2007032392 A JP 2007032392A JP 2007032392 A JP2007032392 A JP 2007032392A JP 2008198483 A JP2008198483 A JP 2008198483A
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reflector
light
incident
light source
vehicle
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JP4850743B2 (en
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Motohiro Komatsu
元弘 小松
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Koito Manufacturing Co Ltd
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Koito Manufacturing Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F21W2102/10—Arrangement or contour of the emitted light
    • F21W2102/17—Arrangement or contour of the emitted light for regions other than high beam or low beam
    • F21W2102/18—Arrangement or contour of the emitted light for regions other than high beam or low beam for overhead signs

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  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle headlight which enables light distribution for overhead signs (OHS) to be formed by utilizing luminous fluxes from a light source effectively. <P>SOLUTION: The vehicle headlight 1 has an optical axis A1 prolonging in back and front directions of a vehicle, and is configured so that light from an LED 3 may be reflected to the front of a vehicle by a reflector 2, wherein a reflector 2 is located under an LED 3 and has a reflective surface 2A the cross-section of which in alignment with a vertical plane including an optical axis A1, shows an abbreviated parabolic shape, a reflector 4 is provided which is installed in a position which enables a direct incidence of light from a LED 3 and has a reflective surface 4A for reflecting light from a LED 3 to a reflector 2, and in an incident point P1 on a reflective surface 2A which incident light L1 which carries out direct incidence to a reflective surface 2A from a LED 3, and incident light L2 which carries out incidence to a reflective surface 2A being reflected by a reflector 4, share, an incident angle θ<SB>11</SB>of incident light L1 is larger than an incident angle θ<SB>12</SB>of incident light L2. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、光源から出射された光をリフレクタで反射するようにした車両用前照灯に関するものである。   The present invention relates to a vehicle headlamp in which light emitted from a light source is reflected by a reflector.

従来、このような分野の技術として、実開平５−６６８０４号公報がある。この公報に記載されたプロジェクタ型車両用前照灯においては、投影レンズの出射方向前方に飾りレンズが設けられ、その飾りレンズにおける投影レンズからの有効光束が通過する範囲に水平方向の線状のプリズムカットが施されることにより上向き光を得ることができるようにされている。このような車両用前照灯を用いることで道路標識などの視認性を向上させることができる。   Conventionally, as a technique in such a field, there is Japanese Utility Model Publication No. 5-66804. In the projector-type vehicle headlamp described in this publication, a decorative lens is provided in front of the projection lens in the emission direction, and a horizontal linear line is placed in a range in which the effective luminous flux from the projection lens passes through the decorative lens. By applying a prism cut, upward light can be obtained. By using such a vehicle headlamp, the visibility of road signs and the like can be improved.

また、その他の従来の車両用前照灯としては、光源から直接出射された光を車両前方に向けて反射するためのリフレクタにおいて、その反射面の一部が上向き光を得ることができるように構成されたものも存在する。
実開平５−６６８０４号公報 Further, as another conventional vehicle headlamp, in a reflector for reflecting light directly emitted from a light source toward the front of the vehicle, a part of the reflection surface thereof can obtain upward light. There are also configured ones.
Japanese Utility Model Publication No. 5-66804

しかしながら、上述した従来の車両用前照灯においては、飾りレンズやリフレクタに入射する前照灯の有効光束の一部を上向きの配光用に利用しているため、前照灯の主配光用として本来利用可能である光束から、実際に主配光用として利用される光束の割合が減少してしまう傾向にあった。   However, in the conventional vehicle headlamp described above, a part of the effective luminous flux of the headlamp incident on the decorative lens or the reflector is used for upward light distribution. There is a tendency that the proportion of the light beam that is actually used for main light distribution decreases from the light beam that is originally available for use.

そこで、本発明は、上記課題に鑑みてなされたものであり、光源からの光束を有効に利用して頭上標識（ＯＨＳ）用の配光を形成するようにした車両用前照灯を提供することを目的とする。   Accordingly, the present invention has been made in view of the above problems, and provides a vehicle headlamp configured to form a light distribution for overhead signs (OHS) by effectively using a light beam from a light source. For the purpose.

上記課題を解決するため、本発明の車両用前照灯は、車両前後方向に延びる光軸を有し、光源から出射された光を、第１のリフレクタで車両前方に向けて反射させて、所定の配光を形成するように構成した車両用前照灯において、第１のリフレクタは、光源の上方又は下方の少なくとも一方に位置し、光軸を含む鉛直方向の断面が、光源を焦点とする略放物線形状の反射面を有し、光源からの光が直接入射可能な位置に設けられ、光源からの光を第１のリフレクタに向けて反射する反射面を有する第２のリフレクタを備え、第１のリフレクタが光源の下方に設けられる場合は、光源から直接第１のリフレクタの反射面に入射する第１の入射光と第２のリフレクタで反射されて第１のリフレクタの反射面に入射する第２の入射光とが共有する第１のリフレクタの反射面上の入射点において、第１の入射光の入射角が、第２の入射光の入射角よりも大きくなるように構成され、第１のリフレクタが光源の上方に設けられる場合は、第１の入射光と第２の入射光とが共有する第１のリフレクタの反射面上の入射点において、第１の入射光の入射角が、第２の入射光の入射角よりも小さくなるように構成されていることを特徴としている。   In order to solve the above problems, the vehicle headlamp of the present invention has an optical axis extending in the vehicle front-rear direction, and reflects light emitted from the light source toward the front of the vehicle with the first reflector, In the vehicle headlamp configured to form a predetermined light distribution, the first reflector is located at least one above or below the light source, and a vertical section including the optical axis is focused on the light source. And a second reflector having a reflecting surface that is provided at a position where light from the light source can be directly incident and reflects light from the light source toward the first reflector, When the first reflector is provided below the light source, the first incident light directly incident on the reflecting surface of the first reflector from the light source and reflected by the second reflector and incident on the reflecting surface of the first reflector Shared by the second incident light The incident angle of the first incident light is configured to be larger than the incident angle of the second incident light at the incident point on the reflecting surface of the reflector, and the first reflector is provided above the light source. The incident angle of the first incident light is greater than the incident angle of the second incident light at the incident point on the reflecting surface of the first reflector shared by the first incident light and the second incident light. It is characterized by being configured to be small.

このような車両用前照灯によれば、主配光用に光源の上方又は下方の位置に設けられた断面放物線形状の反射面を有する第１のリフレクタとは別に第２のリフレクタが設けられ、光源から第２のリフレクタに入射する光が、第２のリフレクタの反射面によって反射されることにより、第２の入射光として第１のリフレクタ上の反射面に入射される。この第２の入射光の第１のリフレクタ上の入射点において、第１のリフレクタが光源の下方に設けられる場合は、光源から直接入射する第１の入射光の入射角が第２の入射光の入射角よりも大きくされ、第１のリフレクタが光源の上方に設けられる場合は、第１の入射光の入射角が第２の入射光の入射角よりも小さくされているので、主配光用として利用される光束を減少させること無く、上向きの配光を効率的に作り出すことができる。   According to such a vehicle headlamp, the second reflector is provided separately from the first reflector having a reflecting surface having a parabolic cross section provided at a position above or below the light source for main light distribution. The light incident on the second reflector from the light source is reflected by the reflecting surface of the second reflector, and is incident on the reflecting surface on the first reflector as second incident light. When the first reflector is provided below the light source at the incident point of the second incident light on the first reflector, the incident angle of the first incident light directly incident from the light source is the second incident light. When the first reflector is provided above the light source, the incident angle of the first incident light is smaller than the incident angle of the second incident light. An upward light distribution can be efficiently created without reducing the luminous flux used for the purpose.

第１のリフレクタは、光源の上方に設けられ、第２のリフレクタは、光源に対して車両前方側に設けられていることが好ましい。この場合、第２の入射光の第１のリフレクタ上の入射点における入射角を、確実に第１の入射光の入射角よりも小さくすることができる。また、本来は主配光用として利用され難い車両前方に直接出射された光源光を、上向きの配光用として利用することができ、光源からの光束を上向きの配光用としてより効率的に利用することができる。   It is preferable that the first reflector is provided above the light source, and the second reflector is provided on the vehicle front side with respect to the light source. In this case, the incident angle of the second incident light at the incident point on the first reflector can be surely made smaller than the incident angle of the first incident light. In addition, the light source light directly emitted to the front of the vehicle, which is difficult to be used for main light distribution, can be used for upward light distribution, and the luminous flux from the light source can be used more efficiently for upward light distribution. Can be used.

また、第２のリフレクタは、略平面状の反射面を有することも好ましい。かかる構成を採れば、リフレクタの構造が単純化され結果、車両用前照灯全体の製造工程も簡略化される。   The second reflector also preferably has a substantially planar reflecting surface. By adopting such a configuration, the structure of the reflector is simplified, and as a result, the manufacturing process of the entire vehicle headlamp is also simplified.

光源は、半導体発光素子であることが好ましい。半導体発光素子を光源とする際には、光源からの光束を主配光用に効率的に利用する必要があるが、第２のリフレクタと半導体発光素子とを組み合わせることで、省電力の実現と光量の確保とを両立することができる。   The light source is preferably a semiconductor light emitting element. When a semiconductor light emitting element is used as a light source, it is necessary to efficiently use the light flux from the light source for main light distribution. By combining the second reflector and the semiconductor light emitting element, power saving can be realized. It is possible to ensure both the amount of light.

第１のリフレクタの反射面に対面して配置され、光源を配置するため天板を更に備え、第２のリフレクタは、天板の第１のリフレクタ側の面に設けられていることも好ましい。このように、天板に第２のリフレクタを設けることで、第２のリフレクタと光源及び第１のリフレクタとの位置関係を保ちながら、容易に第２のリフレクタを設置させることができる。   It is also preferable that the first reflector is disposed so as to face the reflecting surface, further includes a top plate for arranging the light source, and the second reflector is provided on the first reflector side surface of the top plate. In this manner, by providing the second reflector on the top plate, the second reflector can be easily installed while maintaining the positional relationship between the second reflector, the light source, and the first reflector.

本発明によれば、光源からの光束を有効に利用して頭上標識（ＯＨＳ）用の配光を形成することができる。   According to the present invention, it is possible to form a light distribution for an overhead sign (OHS) by effectively using a light beam from a light source.

以下、図面を参照しつつ本発明に係る車両用前照灯の好適な実施形態について詳細に説明する。なお、図面の説明においては同一又は相当部分には同一符号を付し、重複する説明を省略する。   DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a vehicle headlamp according to the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

［第１実施形態］
図１は、本発明の第１実施形態にかかる車両用前照灯１０の側面図である。同図に示すように、車両用前照灯１０は、ランプボディ２０とその前方開口端に取り付けられた透明材料からなる透光カバー３０とで形成される灯室内に、車両前後方向に延びる光軸Ａ１を有する灯具ユニット１が、エクステンション／エイミング機構４０を介してその光軸Ａ１が車両上下方向及び左右方向に傾動可能に収容されてなる。 [First Embodiment]
FIG. 1 is a side view of a vehicle headlamp 10 according to a first embodiment of the present invention. As shown in the figure, the vehicle headlamp 10 includes light extending in the vehicle front-rear direction in a lamp chamber formed by a lamp body 20 and a translucent cover 30 made of a transparent material attached to the front opening end thereof. A lamp unit 1 having an axis A1 is accommodated via an extension / aiming mechanism 40 so that the optical axis A1 can tilt in the vehicle vertical direction and the horizontal direction.

図２に示すように、灯具ユニット１は、ロービーム等の所定の配光を作り出すように形成された第１のリフレクタ２と、第１のリフレクタ２に向けて光を出射する光源としてのＬＥＤ（半導体発光素子）３と、ＬＥＤ３の車両前方側（図１の左側）に設けられて、ＬＥＤ３から直接光を受けて第１のリフレクタ２に向けてその光を反射させる第２のリフレクタ４と、第１のリフレクタ２の上方に設けられ、ＬＥＤ３及び第２のリフレクタ４を配置するための平板状の天板５とから構成されている。   As shown in FIG. 2, the lamp unit 1 includes a first reflector 2 formed to produce a predetermined light distribution such as a low beam, and an LED (a light source that emits light toward the first reflector 2). A semiconductor light emitting element) 3, a second reflector 4 provided on the vehicle front side (left side in FIG. 1) of the LED 3 and receiving light directly from the LED 3 and reflecting the light toward the first reflector 2; It is provided above the 1st reflector 2, and is comprised from the flat top plate 5 for arrange | positioning LED3 and the 2nd reflector 4. FIG.

第１のリフレクタ２には、灯具ユニット１の光軸Ａ１を含む鉛直面に沿った断面が、ＬＥＤ３の発光点を焦点とする略放物線状である回転放物面形状に形成された反射面２Ａが設けられている。この第１のリフレクタ２は、天板５の車両後方側（図１の右側）の端部にその端部が取り付けられることによって、反射面２Ａが天板５の下面と対面するように設けられている。さらに、第１のリフレクタ２の上方における天板５の下面には、下方に光を出射可能なようにＬＥＤ３が固定されている。これにより、ＬＥＤ３から直接出射されて反射面２Ａに入射する入射光Ｌ１は、反射面２Ａにおいて車両前方を向いた所定方向、例えばロービーム用であれば略水平方向に反射される。このような第１のリフレクタ２、ＬＥＤ３、及びエクステンション／エイミング機構４０の協働により、車両前方において所定の配光が形成される。   In the first reflector 2, a reflecting surface 2 </ b> A formed in a rotating paraboloid shape in which a cross section along a vertical plane including the optical axis A <b> 1 of the lamp unit 1 is a substantially parabolic shape focusing on the light emitting point of the LED 3. Is provided. The first reflector 2 is provided so that the reflecting surface 2A faces the lower surface of the top plate 5 by attaching the end of the top reflector 5 to the end of the top plate 5 on the vehicle rear side (right side in FIG. 1). ing. Further, the LED 3 is fixed to the lower surface of the top plate 5 above the first reflector 2 so that light can be emitted downward. Thereby, the incident light L1 directly emitted from the LED 3 and incident on the reflecting surface 2A is reflected in a predetermined direction facing the front of the vehicle on the reflecting surface 2A, for example, in a substantially horizontal direction for a low beam. By such cooperation of the first reflector 2, the LED 3, and the extension / aiming mechanism 40, a predetermined light distribution is formed in front of the vehicle.

天板５の下面におけるＬＥＤ３の車両前方側には、天板５の下面に対して傾斜し、且つ車両前方側に延在するような小型平板状の第２のリフレクタ４が設けられている。この第２のリフレクタ４は、ＬＥＤ３からの光が直接入射可能な面を車両後方側に有するように配置され、その面は反射面２Ａに比較して小さい略平面形状の反射面４Ａを構成する。この反射面４Ａは、ＬＥＤ３から車両前方側の反射面４Ａに向けて直接出射された入射光Ｌ２を、第１のリフレクタ２の反射面２Ａに向けて反射させる機能を担う。具体的には、反射面４Ａは、第２のリフレクタ４及びＬＥＤ３の上方における反射面４Ａを基準にしたＬＥＤ３とほぼ対称な位置に、ＬＥＤ３の虚像Ｖ１を生成する。これにより、入射光Ｌ２は、虚像Ｖ１から出射されているものとみなされる。このような構成の第２のリフレクタ４においては、入射光Ｌ２の反射面２Ａ上の入射点Ｐ１において、入射光Ｌ２と入射点Ｐ１を共有する入射光Ｌ１の入射角θ１１が、入射光Ｌ２の入射角θ１２よりも大きくなるように反射面４Ａが向けられることになる。 On the vehicle front side of the LED 3 on the lower surface of the top plate 5, a small flat plate-like second reflector 4 that is inclined with respect to the lower surface of the top plate 5 and extends to the vehicle front side is provided. The second reflector 4 is arranged to have a surface on the vehicle rear side where light from the LED 3 can directly enter, and the surface constitutes a substantially planar reflecting surface 4A smaller than the reflecting surface 2A. . The reflecting surface 4A has a function of reflecting the incident light L2 directly emitted from the LED 3 toward the reflecting surface 4A on the front side of the vehicle toward the reflecting surface 2A of the first reflector 2. Specifically, the reflecting surface 4A generates a virtual image V1 of the LED 3 at a position substantially symmetrical to the LED 3 with respect to the reflecting surface 4A above the second reflector 4 and the LED 3. Thereby, it is considered that the incident light L2 is emitted from the virtual image V1. In the second reflector 4 having such a configuration, the incident point P1 on the reflecting surface 2A of the incident light L2, the incident angle theta 11 of the incident light L1 to share the incident point P1 and the incident light L2, the incident light L2 It will be directed reflective surface 4A so as to be larger than the incident angle theta 12 of.

以上のような車両用前照灯１０によれば、ロービーム等の主配光用に設けられた第１のリフレクタ２とは別に第２のリフレクタ４が設けられ、ＬＥＤ３から車両前方に向けて第２のリフレクタ４に入射する入射光Ｌ２が、反射面４Ａによって反射されることにより、第１のリフレクタ２上の反射面２Ａに入射される。この入射光Ｌ２の第１のリフレクタ２上の入射点Ｐ１において、ＬＥＤ３から直接入射する入射光Ｌ１の入射角θ１１が、入射光Ｌ２の入射角θ１２よりも大きくされているので、主配光用として利用される光束を減少させること無く、頭上標識（ＯＨＳ）用の上向きの配光を効率的に作り出すことができる。特に、ＬＥＤ３から車両前方に直接出射される光は、遮蔽等が行われることによりロービーム等の主配光用には本来使用されない傾向にあるので、第２のリフレクタ４をＬＥＤ３の車両前方側に配置することで光源からの光エネルギーを効率的に上向き配光用として利用することができる。 According to the vehicle headlamp 10 as described above, the second reflector 4 is provided separately from the first reflector 2 provided for main light distribution such as a low beam, and the second reflector 4 is provided from the LED 3 toward the front of the vehicle. The incident light L2 incident on the second reflector 4 is incident on the reflecting surface 2A on the first reflector 2 by being reflected by the reflecting surface 4A. In the first incident point P1 on the reflector 2 of the incident light L2, the incident angle theta 11 of the incident light L1 incident directly from LED3 it is because it is larger than the incident angle theta 12 of the incident light L2, the main distribution An upward light distribution for overhead signs (OHS) can be efficiently created without reducing the luminous flux used for light. In particular, the light directly emitted from the LED 3 directly to the front of the vehicle tends not to be originally used for main light distribution such as a low beam due to shielding or the like, so the second reflector 4 is placed on the vehicle front side of the LED 3. By arranging, light energy from the light source can be efficiently used for upward light distribution.

また、第２のリフレクタ４は、略平面状の反射面４Ａを有するので、リフレクタの構造が単純化され結果、車両用前照灯全体の製造工程も簡略化される。   In addition, since the second reflector 4 has the substantially planar reflecting surface 4A, the structure of the reflector is simplified, and as a result, the manufacturing process of the entire vehicle headlamp is also simplified.

さらに、光源としてのＬＥＤ３と第２のリフレクタ４とを組み合わせることで、省電力の実現と光量の確保とを両立することができる。   Furthermore, by combining the LED 3 as the light source and the second reflector 4, it is possible to achieve both power saving and securing the light quantity.

また、第２のリフレクタ４が、ＬＥＤ３の固定用の天板５の第１のリフレクタ２側の面に設けられているので、第２のリフレクタ４とＬＥＤ３及び第１のリフレクタ２との位置関係を保ちながら、容易に第２のリフレクタ４を設置させることができる。   Moreover, since the 2nd reflector 4 is provided in the surface at the side of the 1st reflector 2 of the top plate 5 for fixing LED3, the positional relationship between the 2nd reflector 4, LED3, and the 1st reflector 2 is provided. It is possible to easily install the second reflector 4 while maintaining the above.

［第２実施形態］
図３は、本発明の第２実施形態にかかる灯具ユニット２１の構成を示す縦断面図である。同図に示すように、灯具ユニット２１において、ＬＥＤ３の車両前方側に位置する第２のリフレクタ２４は、ＬＥＤ３の発光点と後述する虚像Ｖ２とを結ぶ線を回転軸とした回転双曲面状の反射面２４Ａを有し、その反射面２４Ａが形成する回転双曲面の一方の焦点上にＬＥＤ３が位置するように配置されている。ここで、この反射面２４Ａは、凹面となるように形成されている。 [Second Embodiment]
FIG. 3 is a longitudinal sectional view showing the configuration of the lamp unit 21 according to the second embodiment of the present invention. As shown in the figure, in the lamp unit 21, the second reflector 24 located on the vehicle front side of the LED 3 has a rotational hyperboloid shape with a line connecting a light emitting point of the LED 3 and a virtual image V2 described later as a rotation axis. The reflective surface 24A is provided, and the LED 3 is disposed on one focal point of a rotating hyperboloid formed by the reflective surface 24A. Here, the reflecting surface 24A is formed to be a concave surface.

このような反射面２４Ａは、第２のリフレクタ４及びＬＥＤ３の上方における反射面２４Ａが形成する回転双曲面の他方の焦点の位置に、ＬＥＤ３の虚像Ｖ２を生成する。これにより、入射光Ｌ２は、虚像点Ｖ２から出射されているものとみなされる。このような構成の第２のリフレクタ２４においては、入射光Ｌ２の反射面２Ａ上の入射点Ｐ２において、入射光Ｌ２と入射点Ｐ２を共有する入射光Ｌ１の入射角θ２１が、入射光Ｌ２の入射角θ２２よりも大きくなるように反射面２４Ａが向けられることになる。 Such a reflection surface 24 </ b> A generates a virtual image V <b> 2 of the LED 3 at the position of the other focal point of the rotating hyperboloid formed by the reflection surface 24 </ b> A above the second reflector 4 and the LED 3. Thereby, it is considered that the incident light L2 is emitted from the virtual image point V2. In the second reflector 24 having such a configuration, the incident point P2 on the reflecting surface 2A of the incident light L2, the incident angle theta 21 of the incident light L1 to share the incident point P2 and the incident light L2, the incident light L2 It will be directed reflective surface 24A to be larger than the incident angle theta 22.

このような回転双曲面状の反射面２４Ａを有する第２のリフレクタ２４によっても、ＬＥＤ３から直接入射する入射光Ｌ１の入射角θ２１が、入射光Ｌ２の入射角θ２２よりも大きくされているので、主配光用として利用される光束を減少させること無く、頭上標識（ＯＨＳ）用の上向きの配光を効率的に作り出すことができる。 By a second reflector 24 having such a rotational hyperboloid shaped reflecting surface 24A, the incident angle theta 21 of the incident light L1 incident directly from LED3, are larger than the incident angle theta 22 of the incident light L2 Therefore, an upward light distribution for overhead signs (OHS) can be efficiently created without reducing the luminous flux used for the main light distribution.

図４は、本発明の第２実施形態にかかる車両用前照灯による車両前方の光量分布を示す図であり、（ａ）は、灯具ユニット２１の斜視図、（ｂ）は、（ａ）の灯具ユニット２１を含む車両用前照灯の車両前方における光量分布を示す図である。これに対して、図９には、第２のリフレクタを除いた場合の比較例である車両用前照灯９０１による車両前方の光量分布を示している。ここでは、図４（ａ）及び図９（ａ）に示すように、ＬＥＤ３の出射方向に沿ってＶ軸、車両前後方向に沿ってＸ軸、車両横方向に沿ってＨ軸が設定されている。このような座標系に対応して、図４（ｂ）及び図９（ｂ）には、車両前方に位置するＨ−Ｖ平面における光量分布が等高線によって示されている。これらの結果により、本発明の第２実施形態の車両用前照灯においては、ロービームの配光分布の上方に上向きの配光が効率的に形成されていることが分かる。   4A and 4B are diagrams showing a light amount distribution in front of the vehicle by the vehicle headlamp according to the second embodiment of the present invention. FIG. 4A is a perspective view of the lamp unit 21, and FIG. It is a figure which shows the light quantity distribution in the vehicle front of the vehicle headlamp containing the lamp unit 21 of this. On the other hand, FIG. 9 shows the light amount distribution ahead of the vehicle by the vehicle headlamp 901 which is a comparative example when the second reflector is omitted. Here, as shown in FIGS. 4A and 9A, the V axis is set along the emission direction of the LED 3, the X axis is set along the vehicle front-rear direction, and the H axis is set along the vehicle lateral direction. Yes. Corresponding to such a coordinate system, in FIG. 4B and FIG. 9B, the light quantity distribution in the HV plane located in front of the vehicle is shown by contour lines. From these results, it can be seen that in the vehicle headlamp of the second embodiment of the present invention, the upward light distribution is efficiently formed above the light distribution of the low beam.

［第３実施形態］
図５は、本発明の第３実施形態にかかる灯具ユニット３１の構成を示す縦断面図である。同図に示すように、灯具ユニット３１においては、第１のリフレクタ２は、ＬＥＤ３に対して上方側に配置されている。詳細には、灯具ユニット３１は、ＬＥＤ３及び第２のリフレクタ３４が配置された天板５と第１のリフレクタ２との位置関係及び形状が、第１実施形態に対して反転された構造を有している。 [Third Embodiment]
FIG. 5 is a longitudinal sectional view showing the configuration of the lamp unit 31 according to the third embodiment of the present invention. As shown in the figure, in the lamp unit 31, the first reflector 2 is disposed above the LED 3. Specifically, the lamp unit 31 has a structure in which the positional relationship and shape of the top plate 5 on which the LED 3 and the second reflector 34 are arranged and the first reflector 2 are reversed with respect to the first embodiment. is doing.

第２のリフレクタ３４は、ＬＥＤ３の車両後方側において、天板５の上面に対して傾斜し、且つ車両後方側に延在するような小型平板状の形状を有する。さらに、この第２のリフレクタ３４は、車両前方側に反射面３４Ａを有し、この反射面３４Ａは、ＬＥＤ３から反射面３４Ａに向けて直接出射された入射光Ｌ２を、第１のリフレクタ２の反射面２Ａに向けて反射させる機能を担う。具体的には、反射面３４Ａは、第２のリフレクタ３４の下方における反射面３４Ａを基準にしたＬＥＤ３とほぼ対称な位置に、ＬＥＤ３の虚像Ｖ３を生成する。これにより、入射光Ｌ２は、虚像Ｖ３から出射されているものとみなされる。このような構成の第２のリフレクタ３４においては、入射光Ｌ２の反射面２Ａ上の入射点Ｐ３において、入射光Ｌ２と入射点Ｐ１を共有する入射光Ｌ１の入射角θ３１が、入射光Ｌ２の入射角θ３２よりも小さくなるように反射面３４Ａが向けられることになる。 The second reflector 34 has a small flat plate shape that is inclined with respect to the upper surface of the top plate 5 and extends to the vehicle rear side on the vehicle rear side of the LED 3. Further, the second reflector 34 has a reflecting surface 34A on the front side of the vehicle, and the reflecting surface 34A receives incident light L2 directly emitted from the LED 3 toward the reflecting surface 34A. It has a function of reflecting toward the reflecting surface 2A. Specifically, the reflecting surface 34 </ b> A generates a virtual image V <b> 3 of the LED 3 at a position substantially symmetrical to the LED 3 with respect to the reflecting surface 34 </ b> A below the second reflector 34. Thereby, it is considered that the incident light L2 is emitted from the virtual image V3. In the second reflector 34 having such a configuration, the incident point P3 on the reflecting surface 2A of the incident light L2, the incident angle theta 31 of the incident light L1 to share the incident point P1 and the incident light L2, the incident light L2 It will be directed reflective surface 34A to be smaller than the incident angle theta 32 of.

このような灯具ユニット３１においては、ＬＥＤ３から直接入射する入射光Ｌ１の入射角θ３１が、入射光Ｌ２の入射角θ３２よりも小さくされているので、主配光用として利用される光束を減少させること無く、頭上標識（ＯＨＳ）用の上向きの配光を効率的に作り出すことができる。 In such a lamp unit 31, the incident angle theta 31 of the incident light L1 incident directly from LED3 is because it is smaller than the incident angle theta 32 of the incident light L2, the light flux utilized for the main light distribution Without diminishing, an upward light distribution for overhead sign (OHS) can be created efficiently.

なお、本発明は、前述した実施形態に限定されるものではない。例えば、第２の入射光Ｌ２を入射させる入射点Ｐ１は様々な位置に設定することが可能である。例えば、図６に示す本発明の変形例である灯具ユニット４１のように、第２のリフレクタ４４の反射面４４Ａの天板５に対する傾斜角を変更して、入射光Ｌ２の入射点Ｐ４を第１のリフレクタ２の反射面２Ａ上の車両後方側に位置するように設定しても良い。   In addition, this invention is not limited to embodiment mentioned above. For example, the incident point P1 on which the second incident light L2 is incident can be set at various positions. For example, like the lamp unit 41 which is a modification of the present invention shown in FIG. 6, the inclination angle of the reflecting surface 44A of the second reflector 44 with respect to the top plate 5 is changed, and the incident point P4 of the incident light L2 is changed to the first point You may set so that it may be located in the vehicle rear side on 2 A of reflective surfaces of the reflector 2 of 1.

また、第２のリフレクタの反射面は、凸面となるように形成されていてもよい。例えば、図７に示す本発明の変形例である灯具ユニット６１のように、第２のリフレクタ６４の反射面６４ＡがＬＥＤ３側に凸面となるような回転双曲面状に形成されていてもよい。この場合、反射面６４Ａが形成する回転双曲面の一方の焦点の位置に重なるようにＬＥＤ３が配置されることにより、他方の焦点の位置にＬＥＤ３の虚像Ｖ５が生成される。   Further, the reflection surface of the second reflector may be formed to be a convex surface. For example, like the lamp unit 61 which is a modified example of the present invention shown in FIG. 7, the reflecting surface 64A of the second reflector 64 may be formed in a rotating hyperboloid shape that becomes a convex surface on the LED 3 side. In this case, the LED 3 is arranged so as to overlap with the position of one focal point of the rotating hyperboloid formed by the reflecting surface 64A, so that the virtual image V5 of the LED 3 is generated at the position of the other focal point.

また、第２のリフレクタの反射面としては、平面形状や回転双曲面形状以外にも様々な形状のものを採用することができる。例えば、図８（ａ）に示す本発明の変形例である灯具ユニット８１のように、第２のリフレクタ８４の反射面８４Ａが車両左右方向（Ｙ軸方向）に沿って延びる双曲柱状に形成されていてもよい。この場合も、図８（ｂ）に示すように、車両前方側においてロービームの配光分布の上方に上向きの配光が効率的に形成される。   In addition to the planar shape and the rotational hyperboloid shape, various shapes can be employed as the reflecting surface of the second reflector. For example, like a lamp unit 81 which is a modification of the present invention shown in FIG. 8A, the reflecting surface 84A of the second reflector 84 is formed in a hyperbolic column shape extending along the vehicle left-right direction (Y-axis direction). May be. Also in this case, as shown in FIG. 8B, an upward light distribution is efficiently formed above the light distribution of the low beam on the front side of the vehicle.

本発明の第１実施形態にかかる車両用前照灯の構成を示す側面図である。It is a side view which shows the structure of the vehicle headlamp concerning 1st Embodiment of this invention. 図１の灯具ユニットの構成を示す縦断面図である。It is a longitudinal cross-sectional view which shows the structure of the lamp unit of FIG. 本発明の第２実施形態にかかる灯具ユニットの構成を示す縦断面図である。It is a longitudinal cross-sectional view which shows the structure of the lamp unit concerning 2nd Embodiment of this invention. 図３の灯具ユニットを含む車両用前照灯による車両前方の光量分布を示す図であり、（ａ）は、灯具ユニットの斜視図、（ｂ）は、（ａ）の灯具ユニットを含む車両用前照灯の車両前方における光量分布を示す図である。It is a figure which shows the light quantity distribution ahead of the vehicle by the vehicle headlamp containing the lamp unit of FIG. 3, (a) is a perspective view of a lamp unit, (b) is for vehicles containing the lamp unit of (a). It is a figure which shows the light quantity distribution in the vehicle front of a headlamp. 本発明の第３実施形態にかかる灯具ユニットの構成を示す縦断面図である。It is a longitudinal cross-sectional view which shows the structure of the lamp unit concerning 3rd Embodiment of this invention. 本発明の変形例にかかる灯具ユニットの構成を示す縦断面図である。It is a longitudinal cross-sectional view which shows the structure of the lamp unit concerning the modification of this invention. 本発明の他の変形例にかかる灯具ユニットの構成を示す縦断面図である。It is a longitudinal cross-sectional view which shows the structure of the lamp unit concerning the other modification of this invention. 本発明の変形例である車両用前照灯による車両前方の光量分布を示す図であり、（ａ）は、灯具ユニットの斜視図、（ｂ）は、（ａ）の灯具ユニットを含む車両用前照灯の車両前方における光量分布を示す図である。It is a figure which shows the light quantity distribution ahead of the vehicle by the vehicle headlamp which is a modification of this invention, (a) is a perspective view of a lamp unit, (b) is for vehicles containing the lamp unit of (a). It is a figure which shows the light quantity distribution in the vehicle front of a headlamp. 本発明の比較例である車両用前照灯による車両前方の光量分布を示す図であり、（ａ）は、車両用前照灯の斜視図、（ｂ）は、（ａ）の車両用前照灯の車両前方における光量分布を示す図である。It is a figure which shows the light quantity distribution ahead of the vehicle by the vehicle headlamp which is a comparative example of this invention, (a) is a perspective view of a vehicle headlamp, (b) is a vehicle front of (a). It is a figure which shows the light quantity distribution in the vehicle front of an illumination lamp.

符号の説明Explanation of symbols

Ａ１…光軸１、１０…車両用前照灯、２…第１リフレクタ、２Ａ…反射面、４，２４，３４，４４，６４，８４…第２リフレクタ、４Ａ，２４Ａ，３４Ａ，４４Ａ，６４Ａ，８４Ａ…反射面、５…天板、Ｌ１，Ｌ２…入射光、Ｐ１，Ｐ２，Ｐ３，Ｐ４…入射点、Ｖ１，Ｖ２，Ｖ３，Ｖ５…虚像。   A1: Optical axis 1, 10: Vehicle headlamp, 2 ... First reflector, 2A ... Reflecting surface, 4, 24, 34, 44, 64, 84 ... Second reflector, 4A, 24A, 34A, 44A, 64A , 84A ... reflective surface, 5 ... top plate, L1, L2 ... incident light, P1, P2, P3, P4 ... incident point, V1, V2, V3, V5 ... virtual image.

Claims (5)

車両前後方向に延びる光軸を有し、光源から出射された光を、第１のリフレクタで車両前方に向けて反射させて、所定の配光を形成するように構成した車両用前照灯において、
前記第１のリフレクタは、前記光源の上方又は下方の少なくとも一方に位置し、前記光軸を含む鉛直方向の断面が、光源を焦点とする略放物線形状の反射面を有し、
前記光源からの光が直接入射可能な位置に設けられ、前記光源からの光を前記第１のリフレクタに向けて反射する反射面を有する第２のリフレクタを備え、
前記第１のリフレクタが前記光源の下方に設けられる場合は、前記光源から直接前記第１のリフレクタの反射面に入射する第１の入射光と前記第２のリフレクタで反射されて前記第１のリフレクタの反射面に入射する第２の入射光とが共有する前記第１のリフレクタの反射面上の入射点において、前記第１の入射光の入射角が、前記第２の入射光の入射角よりも大きくなるように構成され、
前記第１のリフレクタが前記光源の上方に設けられる場合は、前記第１の入射光と前記第２の入射光とが共有する前記第１のリフレクタの反射面上の入射点において、前記第１の入射光の入射角が、前記第２の入射光の入射角よりも小さくなるように構成されている、
ことを特徴とする車両用前照灯。 A vehicle headlamp having an optical axis extending in a vehicle front-rear direction and configured to reflect light emitted from a light source toward a vehicle front by a first reflector to form a predetermined light distribution ,
The first reflector is located at least one above or below the light source, and a vertical section including the optical axis has a substantially parabolic reflecting surface with the light source as a focal point,
A second reflector having a reflection surface provided at a position where light from the light source can be directly incident and reflecting the light from the light source toward the first reflector;
When the first reflector is provided below the light source, the first incident light that is directly incident on the reflecting surface of the first reflector from the light source and reflected by the second reflector are reflected on the first reflector. At the incident point on the reflecting surface of the first reflector shared by the second incident light incident on the reflecting surface of the reflector, the incident angle of the first incident light is the incident angle of the second incident light. Configured to be larger than
When the first reflector is provided above the light source, at the incident point on the reflecting surface of the first reflector shared by the first incident light and the second incident light, the first reflector is provided. The incident angle of the incident light is configured to be smaller than the incident angle of the second incident light.
A vehicular headlamp characterized by that. 前記第１のリフレクタは、前記光源の上方に設けられ、前記第２のリフレクタは、前記光源に対して車両前方側に設けられていることを特徴とする請求項１記載の車両用前照灯。   2. The vehicle headlamp according to claim 1, wherein the first reflector is provided above the light source, and the second reflector is provided on the vehicle front side with respect to the light source. . 前記第２のリフレクタは、略平面状の反射面を有することを特徴とする請求項１又は２に記載の車両用前照灯。   The vehicle headlamp according to claim 1 or 2, wherein the second reflector has a substantially planar reflecting surface. 前記光源は、半導体発光素子であることを特徴とする請求項１〜３のいずれか一項に記載の車両用前照灯。   The vehicle headlamp according to claim 1, wherein the light source is a semiconductor light emitting element. 前記第１のリフレクタの反射面に対面して配置され、前記光源を配置するため天板を更に備え、
前記第２のリフレクタは、前記天板の前記第１のリフレクタ側の面に設けられていることを特徴とする請求項１〜４のいずれか一項に記載の車両用前照灯。 Further comprising a top plate arranged to face the reflecting surface of the first reflector, and for arranging the light source,
The vehicular headlamp according to any one of claims 1 to 4, wherein the second reflector is provided on a surface of the top plate on the first reflector side.
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