JP2017208196A - Vehicular lighting fixture - Google Patents
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Abstract
Description
本発明は、車両用灯具に関するものであり、詳しくは、少なくともすれ違いビーム用配光パターン（主配光パターン）とオーバーヘッドサイン配光パターンの夫々の配光パターンの形成に寄与する光を出射する車両用灯具に関する。 The present invention relates to a vehicular lamp, and more specifically, a vehicle that emits light that contributes to the formation of light distribution patterns of at least a passing beam light distribution pattern (main light distribution pattern) and an overhead sign light distribution pattern. It relates to a lamp.
従来、出射光によってすれ違いビーム（ロービーム）用配光パターンとオーバーヘッドサイン配光パターンとを形成する車両用灯具としては、例えば、特許文献１に開示されたものがある。 Conventionally, as a vehicular lamp that forms a passing beam (low beam) light distribution pattern and an overhead sign light distribution pattern by emitted light, there is one disclosed in Patent Document 1, for example.
開示された車両用灯具（車両用灯具ユニット）は、ロービーム用配光パターンを形成するように構成されたプロジェクタ型の灯具ユニットであり、その具体的な構成は図１１（ａ）にあるように、入光面８０ａを励起光源８１の前方近傍に配置すると共に出光面８０ｂを波長変換部材８２に密着配置あるいは近接配置してなるライトガイド８０の出光面８０ｂ側の上方に、波長変換部材８２を覆うようにメイン反射面８３及び第１サブ反射面８４が配置され、メイン反射面８３及び第１サブ反射面８４の前方斜め下方に第２サブ反射面８５、前方に投影レンズ８６が夫々配置されている。 The disclosed vehicle lamp (vehicle lamp unit) is a projector-type lamp unit configured to form a low beam light distribution pattern, and its specific configuration is as shown in FIG. The wavelength conversion member 82 is disposed above the light output surface 80b side of the light guide 80 in which the light incident surface 80a is disposed near the front of the excitation light source 81 and the light output surface 80b is disposed in close proximity to or in close proximity to the wavelength conversion member 82. A main reflection surface 83 and a first sub reflection surface 84 are disposed so as to cover, a second sub reflection surface 85 is disposed obliquely in front of the main reflection surface 83 and the first sub reflection surface 84, and a projection lens 86 is disposed in front thereof. ing.
そのうち、メイン反射面８３は、車両後方側（投影レンズ８６と反対側）に延びる中心軸Ｘａに対して左右夫々１２０°の範囲から上方に延びる沿直方向に楕円の形状を有しており、第１サブ反射面８４は、メイン反射面８３の先端付近から投影レンズ８６に向かって延びる回転楕円系の形状を有しており、第２サブ反射面８５は、水平面に対して車両前方側（投影レンズ８６側）に向かって下側に傾斜する平面形状を有している。 Among them, the main reflection surface 83 has an elliptical shape extending in a straight direction extending upward from a range of 120 ° to the left and right with respect to the central axis Xa extending on the vehicle rear side (opposite to the projection lens 86), The first sub-reflecting surface 84 has a spheroid shape extending from the vicinity of the tip of the main reflecting surface 83 toward the projection lens 86, and the second sub-reflecting surface 85 is on the vehicle front side ( It has a planar shape that is inclined downward toward the projection lens 86 side.
そこで、励起光源８１から発せられてライトガイド８０の入光面８０ａを介してライトガイド８０に入射した光は、ライトガイド８０内を導光されて出光面８０ｂを介して波長変換部材８２に向けて出射される。そして、波長変換部材８２からは、励起光源８１からの出射光により励起されて波長変換された波長変換光と励起光源８１からの出射光がそのまま透過した直接光との混合光が出射され、メイン反射面８３、第１サブ反射面８４及び第２サブ反射面８５で所定の方向に向けて反射されて夫々の反射光が前方に位置する投影レンズ８６を透過して外部に照射される。 Therefore, the light emitted from the excitation light source 81 and incident on the light guide 80 through the light incident surface 80a of the light guide 80 is guided in the light guide 80 and directed toward the wavelength conversion member 82 through the light output surface 80b. Are emitted. Then, the wavelength conversion member 82 emits mixed light of the wavelength-converted light that is excited by the light emitted from the excitation light source 81 and converted in wavelength, and the direct light that is directly transmitted through the light emitted from the excitation light source 81. Reflected in a predetermined direction by the reflecting surface 83, the first sub-reflecting surface 84, and the second sub-reflecting surface 85, each reflected light is transmitted through the projection lens 86 located in front and irradiated outside.
上記構成の車両用灯具ユニット９０からの照射光によって車両前方に想定した仮想鉛直スクリーン上に投影される配光パターンは、図１１（ｂ）にあるように、メイン反射面８３の、中心軸Ｘａを含む水平面近傍の領域８３ｂの反射光によって部分配光パターン（高光度領域）Ｐ１が形成され、メイン反射面８３の領域８３ｂ以外の部分の反射光によって部分配光パターンＰ２が形成され、部分配光パターンＰ１と部分配光パターンＰ２との合成配光パターンによって水平基準線（Ｈ）の下側に位置するロービーム用配光パターンが形成される。 As shown in FIG. 11B, the light distribution pattern projected on the virtual vertical screen assumed in front of the vehicle by the light emitted from the vehicle lamp unit 90 having the above-described configuration is the central axis Xa of the main reflecting surface 83. The partial distribution light pattern (high luminous intensity region) P1 is formed by the reflected light of the region 83b in the vicinity of the horizontal plane including the light, and the partial distribution light pattern P2 is formed by the reflected light of the portion other than the region 83b of the main reflection surface 83. A low beam light distribution pattern located below the horizontal reference line (H) is formed by the combined light distribution pattern of the light pattern P1 and the partial distribution light pattern P2.
また、第１サブ反射面８４での反射後に第２サブ反射面８５で反射された反射光によって水平基準線（Ｈ）の上方に位置する、道路標識や道路案内板等の頭上標識が設けられたオーバーヘッドサイン領域Ａを照らすオーバーヘッドサイン配光パターンＰ３が形成される。 In addition, overhead signs such as road signs and road guide boards are provided above the horizontal reference line (H) by the reflected light reflected by the second sub-reflecting face 85 after being reflected by the first sub-reflecting face 84. The overhead sign light distribution pattern P3 that illuminates the overhead sign area A is formed.
ところで、上記構成からなる車両用灯具ユニット９０は、部分配光パターンＰ１と部分配光パターンＰ２との合成配光パターンによって形成されたロービーム用配光パターンと、オーバーヘッドサイン配光パターンＰ３との間に照射光が向かわない（照らさない）暗い領域（暗部領域）Ｂが生じる。そのため、夜間走行時の運転者の視認性が低下して運転に支障をきたす恐れがある。 By the way, the vehicular lamp unit 90 having the above-described configuration is provided between the low beam light distribution pattern formed by the combined light distribution pattern of the partial distribution light pattern P1 and the partial distribution light pattern P2 and the overhead sign light distribution pattern P3. A dark region (dark region) B is generated in which the irradiation light is not directed (not illuminated). For this reason, the visibility of the driver when traveling at night may be reduced, which may hinder driving.
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、少なくともすれ違いビーム用配光パターン（主配光パターン）とオーバーヘッドサイン配光パターンの夫々の配光パターンを互いに部分的に重ね繋いで形成することにより、夜間走行時の運転者の視認性が良好な車両用灯具を実現することにある。 Therefore, the present invention was devised in view of the above problems, and the object of the present invention is to provide at least a light distribution pattern for a passing beam (main light distribution pattern) and an overhead sign light distribution pattern for each other. It is intended to realize a vehicular lamp having good visibility for a driver during night driving by forming a partly overlapped connection.
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、光源と、前記光源の上方に位置する第１反射面と、前記第１反射面の前端近傍に位置する第２反射面と、前記第２反射面の下方に位置する第３反射面と、前記第３反射面の前方に位置するレンズと、 前記光源と前記レンズとの間に位置するシェードとを備え、前記第１反射面は、前記光源の位置に第１焦点を有し、かつ、前記シェードの前端に第２焦点を有する回転楕円面を基調とする回転楕円系反射面であり、前記第２反射面は、前記第１焦点を一方の焦点とし、かつ、前記第２反射面から前記第３反射面を通る略延長線上に他方の焦点となる第３焦点を有する回転楕円面を基調とする回転楕円系反射面を含み、前記第３反射面は、前記第２焦点近傍の位置から前方斜め下方に向かって傾斜して延びる反射面であり、前記レンズは、前記第２焦点を焦点とし、前記レンズ前面の光出射面の下側部分の少なくとも一部が、前記第２焦点を通過した光を平行光とする曲率よりも小さい曲率に形成された形状を有し、かつ、前記レンズ前面の光出射面の下部近傍に前記第３焦点の仮想焦点が位置する投影型レンズであることを特徴とするものである。 In order to solve the above-mentioned problem, the invention described in claim 1 of the present invention includes a light source, a first reflection surface located above the light source, and a second position located near the front end of the first reflection surface. A reflective surface, a third reflective surface positioned below the second reflective surface, a lens positioned in front of the third reflective surface, and a shade positioned between the light source and the lens, The first reflecting surface is a spheroid reflecting surface based on a spheroid having a first focal point at the position of the light source and having a second focal point at the front end of the shade, and the second reflecting surface. Is a spheroid based on a spheroid having a first focus as the first focus and a third focus as the other focus on a substantially extended line from the second reflection surface through the third reflection surface. The third reflecting surface is inclined forward from a position near the second focal point. A reflecting surface extending downward and inclined, wherein the lens has the second focal point as a focal point, and at least a part of a lower portion of the light emitting surface of the front surface of the lens has passed through the second focal point A projection lens having a shape formed with a curvature smaller than the curvature of parallel light, and the virtual focal point of the third focal point being positioned near the lower part of the light exit surface of the front surface of the lens. It is what.
また、本発明の請求項２に記載された発明は、光源と、前記光源の上方に位置する第１反射面と、前記第１反射面の前端近傍に位置する第２反射面と、前記第２反射面の下方に位置する第３反射面と、前記第３反射面の前方に位置するレンズと、前記光源と前記レンズとの間に位置するシェードとを備え、前記第１反射面は、前記光源の位置に第１焦点を有し、かつ、前記シェードの前端に第２焦点を有する回転楕円面を基調とする回転楕円系反射面であり、前記第２反射面は、前記第１焦点を一方の焦点とし、かつ、前記第２反射面から前記第３反射面を通る略延長線上に他方の焦点となる第３焦点を有する回転楕円面を基調とする回転楕円系反射面を含み、前記第３反射面は、前記第２焦点近傍の位置から前方斜め下方に向かって傾斜して延びる反射面であり、前記レンズは、前記第２焦点を焦点とし、前記レンズ後面の光入射面の下側部分の少なくとも一部が、前記第２焦点を通過した光を平行光とする曲率よりも小さい曲率に形成された形状を有し、かつ、前記レンズ後面の光入射面の下部近傍に前記第３焦点の仮想焦点が位置する投影型レンズであることを特徴とするものである。 According to a second aspect of the present invention, there is provided a light source, a first reflecting surface located above the light source, a second reflecting surface located near the front end of the first reflecting surface, and the first reflecting surface. A third reflecting surface located below the second reflecting surface, a lens located in front of the third reflecting surface, and a shade located between the light source and the lens, the first reflecting surface comprising: It is a spheroid reflection surface based on a spheroid having a first focal point at the position of the light source and having a second focal point at the front end of the shade, and the second reflective surface is the first focal point. Including a spheroid reflecting surface based on a spheroid having a third focal point which is the other focal point on a substantially extended line passing through the third reflecting surface from the second reflecting surface. The third reflecting surface is inclined forward and downward from a position near the second focal point. An extended reflecting surface, wherein the lens has a focal point with the second focal point, and at least a part of a lower part of the light incident surface on the rear surface of the lens has a curvature with parallel light as the light passing through the second focal point. The projection lens has a shape formed with a small curvature, and the virtual focal point of the third focal point is located near the lower part of the light incident surface on the rear surface of the lens.
また、本発明の請求項３に記載された発明は、光源と、前記光源の上方に位置する第１反射面と、前記第１反射面の前端近傍に位置する第２反射面と、前記第２反射面の下方に位置する第３反射面と、前記第３反射面の前方に位置するレンズと、前記光源と前記レンズとの間に位置するシェードとを備え、前記第１反射面は、前記光源の位置に第１焦点を有し、かつ、前記シェードの前端に第２焦点を有する回転楕円面を基調とする回転楕円系反射面であり、前記第２反射面は、前記第１焦点を一方の焦点とし、かつ、前記第２反射面から前記第３反射面を通る略延長線上に他方の焦点となる第３焦点を有する回転楕円面を基調とする回転楕円系反射面を含み、前記第３反射面は、前記第２焦点近傍の位置から前方斜め下方に向かって傾斜して延びる反射面であり、前記レンズは、前記第２焦点を焦点とし、前記レンズ前面の光出射面の上側部分の少なくとも一部が、前記第２焦点を通過した光を平行光とする曲率よりも大きい曲率に形成された形状を有し、かつ、前記レンズ前面の光出射面の上部近傍に前記第３焦点の仮想焦点が位置する投影型レンズであることを特徴とするものである。 According to a third aspect of the present invention, there is provided a light source, a first reflecting surface located above the light source, a second reflecting surface located near the front end of the first reflecting surface, and the first reflecting surface. A third reflecting surface located below the second reflecting surface, a lens located in front of the third reflecting surface, and a shade located between the light source and the lens, the first reflecting surface comprising: It is a spheroid reflection surface based on a spheroid having a first focal point at the position of the light source and having a second focal point at the front end of the shade, and the second reflective surface is the first focal point. Including a spheroid reflecting surface based on a spheroid having a third focal point which is the other focal point on a substantially extended line passing through the third reflecting surface from the second reflecting surface. The third reflecting surface is inclined forward and downward from a position near the second focal point. A reflecting surface extending, wherein the lens has a focal point that is the second focal point, and at least a part of the upper part of the light emitting surface of the front surface of the lens has a curvature that makes parallel light the light that has passed through the second focal point. The projection lens has a shape formed with a large curvature, and the virtual focal point of the third focal point is located in the vicinity of the upper part of the light emitting surface of the front surface of the lens.
また、本発明の請求項４に記載された発明は、光源と、前記光源の上方に位置する第１反射面と、前記第１反射面の前端近傍に位置する第２反射面と、前記第２反射面の下方に位置する第３反射面と、前記第３反射面の前方に位置するレンズと、前記光源と前記レンズとの間に位置するシェードとを備え、前記第１反射面は、前記光源の位置に第１焦点を有し、かつ、前記シェードの前端に第２焦点を有する回転楕円面を基調とする回転楕円系反射面であり、前記第２反射面は、前記第１焦点を一方の焦点とし、かつ、前記第２反射面から前記第３反射面を通る略延長線上に他方の焦点となる第３焦点を有する回転楕円面を基調とする回転楕円系反射面を含み、前記第３反射面は、前記第２焦点近傍の位置から前方斜め下方に向かって傾斜して延びる反射面であり、前記レンズは、前記第２焦点を焦点とし、前記レンズ後面の光入射面の上側部分の少なくとも一部が、前記第２焦点を通過した光を平行光とする曲率よりも大きい曲率に形成された形状を有し、かつ、前記レンズ後面の光入射面の上部近傍に前記第３焦点の仮想焦点が位置する投影型レンズであることを特徴とするものである。 According to a fourth aspect of the present invention, there is provided a light source, a first reflecting surface located above the light source, a second reflecting surface located near the front end of the first reflecting surface, and the first reflecting surface. A third reflecting surface located below the second reflecting surface, a lens located in front of the third reflecting surface, and a shade located between the light source and the lens, the first reflecting surface comprising: It is a spheroid reflection surface based on a spheroid having a first focal point at the position of the light source and having a second focal point at the front end of the shade, and the second reflective surface is the first focal point. Including a spheroid reflecting surface based on a spheroid having a third focal point which is the other focal point on a substantially extended line passing through the third reflecting surface from the second reflecting surface. The third reflecting surface is inclined forward and downward from a position near the second focal point. A reflecting surface that extends, and the lens has a second focal point as a focal point, and at least a part of an upper portion of the light incident surface on the rear surface of the lens has a curvature that is parallel light that has passed through the second focal point. It is a projection type lens having a shape formed with a large curvature and in which the virtual focal point of the third focal point is located near the upper part of the light incident surface on the rear surface of the lens.
また、本発明の請求項５に記載された発明は、請求項１から請求項４のいずれか１項において、前記第２反射面の前端近傍に第４反射面を有し、前記第４反射面は前記第２反射面の前端近傍に対して内側に湾曲傾斜し、前記光源からの光を前記第３焦点より後方へ反射するようにした反射面であることを特徴とするものである。 According to a fifth aspect of the present invention, in any one of the first to fourth aspects, the fourth reflective surface is provided near the front end of the second reflective surface, and the fourth reflective surface is provided. The surface is a reflective surface that is curved and inclined inward with respect to the vicinity of the front end of the second reflective surface, and reflects light from the light source backward from the third focal point.
また、本発明の請求項６に記載された発明は、請求項１から請求項５のいずれか１項において、前記光源は、半導体発光素子であることを特徴とするものである。 According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the light source is a semiconductor light emitting element.
本発明によれば、第１反射面の反射光によって主配光パターンを形成し、第２反射面で反射して更に第３反射面で反射した反射光によって記主配光パターンの上端部に重なって繋がるオーバーヘッドサイン配光パターンを形成するようにした。 According to the present invention, the main light distribution pattern is formed by the reflected light of the first reflecting surface, reflected by the second reflecting surface, and further reflected by the third reflecting surface on the upper end portion of the main light distributing pattern. Overhead sign light distribution patterns that overlap are connected.
これにより、主配光パターンとオーバーヘッドサイン配光パターンとの間に暗部が存在せず、夜間走行時の運転者の前方及び前方斜め上方の視認性が高まって車両前方の障害物及び道路標識や道路案内板等の頭上標識を容易に認識することができる。 As a result, there is no dark portion between the main light distribution pattern and the overhead sign light distribution pattern, and the visibility of the driver's front and diagonally upwards at the time of driving at night increases, and obstacles and road signs in front of the vehicle Overhead signs such as road information boards can be easily recognized.
以下、この発明の好適な実施形態を図１〜図１０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, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 to 10 (the same parts are denoted by the same reference numerals). 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は実施形態の車両用灯具の要部の概略分解斜視図、図２は図１の車両搭載時の車両前後方向に沿う縦断面図、図３は実施形態の車両用灯具の光学系を構成する面の配置説明図、図４はレンズ下端部の光出射面の部分拡大説明図、図５は実施形態の車両用灯具の光路図、図６及び図７は実施形態の車両用灯具で形成される配光パターンの説明図である。 1 is a schematic exploded perspective view of a main part of a vehicular lamp according to the embodiment, FIG. 2 is a longitudinal sectional view along the vehicle front-rear direction when the vehicle is mounted in FIG. 1, and FIG. 3 is an optical system of the vehicular lamp according to the embodiment. FIG. 4 is a partially enlarged explanatory view of the light emitting surface at the lower end of the lens, FIG. 5 is an optical path diagram of the vehicle lamp of the embodiment, and FIGS. 6 and 7 are the vehicle lamp of the embodiment. It is explanatory drawing of the light distribution pattern formed.
本発明の車両用灯具（以下、「灯具」と略称する）１は、光源２、第１リフレクタ１０、第２リフレクタ２０、第４リフレクタ３０及び第３リフレクタ４０の４つのリフレクタと、シェード５０及びレンズ６０によって光学系が構成されてなる、所謂プロジェクタ型の灯具である。 The vehicular lamp (hereinafter abbreviated as “lamp”) 1 of the present invention includes four reflectors, a light source 2, a first reflector 10, a second reflector 20, a fourth reflector 30, and a third reflector 40, a shade 50, This is a so-called projector-type lamp in which an optical system is configured by the lens 60.
上記光学系を構成する各構成部材の概略位置関係は、光源２の上方に第１リフレクタ１０が位置し、第１リフレクタの前端近傍に第２リフレクタ２０及び第４リフレクタ３０が位置し、第２リフレクタ２０及び第４リフレクタ３０の下方にシェード５０及び第３リフレクタ４０が位置し、シェード５０及び第３リフレクタ４０の前方にレンズ６０が位置している。 The schematic positional relationship between the constituent members constituting the optical system is that the first reflector 10 is located above the light source 2, the second reflector 20 and the fourth reflector 30 are located near the front end of the first reflector, and the second The shade 50 and the third reflector 40 are located below the reflector 20 and the fourth reflector 30, and the lens 60 is located in front of the shade 50 and the third reflector 40.
光源２は、灯具を車両に搭載した状態において、車両の前後方向に延びる中心軸Ｚのほぼ軸上に光出射面を上側に向けて配置されている。光源２は具体的には、例えばＬＥＤ等の半導体発光素子が用いられる。また、レーザ光源からのレーザ光を蛍光体に照射して混色光を得るものであっても良い。この場合は、光源２の位置に蛍光体が配置される。 The light source 2 is arranged with the light exit surface facing upward on substantially the center axis Z extending in the front-rear direction of the vehicle when the lamp is mounted on the vehicle. Specifically, for example, a semiconductor light emitting element such as an LED is used as the light source 2. Further, a mixed color light may be obtained by irradiating a phosphor with laser light from a laser light source. In this case, a phosphor is disposed at the position of the light source 2.
第１リフレクタ１０は、光源２（光源２の光出射面）を上方から覆うように中心軸Ｚを含む水平面の上側に配置されている。また、その内面には、中心軸Ｚを長軸とする回転楕円面を基調とした回転楕円系反射面（以下、「第１反射面」と呼称する）１１を備えている。この第１反射面１１の第１の焦点Ｆ１は光源２に位置し、第２の焦点Ｆ２は中心軸Ｚ上であって焦点Ｆ１より前方側に位置する。 The 1st reflector 10 is arrange | positioned above the horizontal surface containing the central axis Z so that the light source 2 (light emission surface of the light source 2) may be covered from upper direction. Further, the inner surface is provided with a spheroid reflection surface (hereinafter referred to as “first reflection surface”) 11 based on a spheroid having the central axis Z as a major axis. The first focal point F1 of the first reflecting surface 11 is located at the light source 2, and the second focal point F2 is located on the central axis Z and ahead of the focal point F1.
これにより、焦点Ｆ１の位置に位置する光源２から第１リフレクタ１０の第１反射面１１に向けて出射された光は、第１反射面１１で焦点Ｆ２の位置及びその近傍に向けて反射され、その反射光が焦点Ｆ２の位置及びその近傍を通って前方から前方斜め下方の範囲に向けて照射される。 Thereby, the light emitted from the light source 2 located at the position of the focal point F1 toward the first reflecting surface 11 of the first reflector 10 is reflected by the first reflecting surface 11 toward the position of the focal point F2 and the vicinity thereof. The reflected light passes through the position of the focal point F2 and the vicinity thereof and is irradiated from the front toward the front obliquely lower range.
第２リフレクタ２０は第１リフレクタ１０の前端近傍に位置し、内面に、光源２の位置に焦点Ｆ１を有し焦点Ｆ２の下方斜め前方に焦点Ｆ３を有すると共に、焦点Ｆ１及び焦点Ｆ３の２つの焦点を通る直線Ｓを長軸とする回転楕円面を基調とした回転楕円系反射面（以下、「第２反射面」と呼称する）２１を備えている。 The second reflector 20 is located in the vicinity of the front end of the first reflector 10, and has a focal point F1 at the position of the light source 2 on the inner surface, a focal point F3 obliquely in front of the focal point F2, and two focal points F1 and F3. A spheroid reflecting surface (hereinafter referred to as “second reflecting surface”) 21 based on a spheroid having a straight line S passing through the focal point as a major axis is provided.
これにより、焦点Ｆ１の位置に位置する光源２から第２リフレクタ２０の第２反射面２１に向けて出射された光は、第２反射面２１で下方斜め前方に位置する焦点Ｆ３の位置及びその近傍に向けて反射される。 As a result, the light emitted from the light source 2 located at the position of the focal point F1 toward the second reflecting surface 21 of the second reflector 20 is positioned at the focal point F3 located diagonally forward and downward on the second reflecting surface 21 and its position. Reflected towards the vicinity.
第４リフレクタ３０は、第２リフレクタ２０の前端部から前方に向かって斜め下方に延びる自由曲面による湾曲形状を有し、内面に、第２反射面２１の前端から前方に向かって第２反射面２１の前端近傍に対して内側に向かって湾曲する内側に凹の湾曲反射面（以下「第４反射面」と呼称する）３１を備えている。 The fourth reflector 30 has a curved shape with a free curved surface extending obliquely downward from the front end portion of the second reflector 20 toward the front, and the second reflection surface on the inner surface from the front end of the second reflection surface 21 toward the front. A concave curved reflecting surface (hereinafter referred to as “fourth reflecting surface”) 31 is provided on the inner side which curves inward with respect to the vicinity of the front end of 21.
これにより、焦点Ｆ１の位置に位置する光源２から第４リフレクタ３０の第４反射面３１に向けて出射された光は、第４反射面３１で焦点Ｆ３の後方側に向けて反射される。 Thereby, the light emitted from the light source 2 located at the position of the focal point F1 toward the fourth reflecting surface 31 of the fourth reflector 30 is reflected by the fourth reflecting surface 31 toward the rear side of the focal point F3.
第３リフレクタ４０は、側面視において、焦点Ｆ２近傍から前方斜め下方に向かって傾斜して延び、平面視において、後端側が焦点Ｆ２近傍を通り両側方側に向かって前方に湾曲する湾曲状を呈しており、上面に平面湾曲反射面（以下、「第３反射面」と呼称する）４１を備えている。第３反射面４１の傾斜角度によって第３反射面４１による反射光が向かう上下方向が設定される。 The third reflector 40 extends obliquely downward from the vicinity of the focal point F2 in the side view, and has a curved shape in which the rear end side passes through the vicinity of the focal point F2 and curves forward toward both sides in the plan view. It has a flat curved reflecting surface (hereinafter referred to as “third reflecting surface”) 41 on its upper surface. The vertical direction in which the light reflected by the third reflection surface 41 travels is set according to the inclination angle of the third reflection surface 41.
第３リフレクタ４０は、第２リフレクタ２０及び第４リフレクタ３０と焦点Ｆ３との間（線分上）に位置し、第３反射面４１によって、光源２から出射して第２リフレクタ２０の第２反射面２１で焦点Ｆ３に向けて反射された反射光を前方斜め下方に向けて反射すると共に、光源２から出射して第４リフレクタ３０の第４反射面３１で焦点Ｆ３の後方側に向けて反射された反射光を前方に向けて反射する。 The third reflector 40 is located between the second reflector 20 and the fourth reflector 30 and the focal point F3 (on the line segment), and is emitted from the light source 2 by the third reflecting surface 41 and is second of the second reflector 20. The reflected light reflected by the reflecting surface 21 toward the focal point F3 is reflected obliquely downward and forward, and is emitted from the light source 2 and directed toward the rear side of the focal point F3 by the fourth reflecting surface 31 of the fourth reflector 30. The reflected light is reflected toward the front.
シェード５０は、側面視において、焦点Ｆ２から後方に向ってほぼ水平に延びる平面状を呈し、光源２から出射して第１リフレクタ１０の第１反射面１１で焦点Ｆ２の位置及びその近傍に向けて反射された反射光の一部を遮光して灯具１から不要な光が出射しないように部分的に光路を遮っている。 The shade 50 has a planar shape extending substantially horizontally toward the rear from the focal point F2 in a side view, and is emitted from the light source 2 toward the position of the focal point F2 and the vicinity thereof on the first reflecting surface 11 of the first reflector 10. The light path is partially blocked so that unnecessary light is not emitted from the lamp 1 by blocking a part of the reflected light.
また、平面視においては、第１リフレクタ１０の第１反射面１１による反射光のうちシェード５０の前端部近傍を通る光によってすれ違い配光パターンのカットオフラインが形成されるため、前端部の形状が所望のカットオフラインの形状に対応するように設定されている。 Further, in plan view, the cut-off line of the passing light distribution pattern is formed by the light passing through the vicinity of the front end portion of the shade 50 among the light reflected by the first reflecting surface 11 of the first reflector 10, so the shape of the front end portion is It is set to correspond to a desired cut-off line shape.
なお、場合によっては、シェード５０の上面に反射面を設け、第１リフレクタ１０の第１反射面１１による反射光の一部をシェード５０の反射面で反射して、前方斜め上方に向かう反射光を灯具１の出射光として有効に利用することも可能である。 In some cases, a reflective surface is provided on the upper surface of the shade 50, and a part of the reflected light from the first reflective surface 11 of the first reflector 10 is reflected by the reflective surface of the shade 50, and the reflected light heads diagonally forward and upward. Can be effectively used as the light emitted from the lamp 1.
レンズ６０は、後面の光入射面６１及び前面の光出射面６２の夫々が外側に凸の湾曲面を有する両凸レンズからなる投影型のレンズであり、光入射面６１側の焦点Ｆ２の位置を焦点位置として焦点Ｆ２及びその近傍を通って光入射面６１を介してレンズ６０内に入射した光をほぼ平行光として光出射面６２から前方方向に向けて出射する。 The lens 60 is a projection type lens composed of a biconvex lens in which the rear light incident surface 61 and the front light emitting surface 62 each have a convex curved surface on the outer side, and the position of the focal point F2 on the light incident surface 61 side is determined. Light entering the lens 60 via the light incident surface 61 through the focal point F2 and its vicinity as the focal position is emitted from the light emitting surface 62 in the forward direction as substantially parallel light.
また、レンズ６０の光出射面６２の下端部近傍に、第２リフレクタ２０の第２反射面２１で焦点Ｆ３に向けて反射されて第３リフレクタ４０の第３反射面４１で反射された反射光が集光する、焦点Ｆ３の仮想焦点Ｆ３´を有している。 Reflected light reflected by the second reflecting surface 21 of the second reflector 20 toward the focal point F3 and reflected by the third reflecting surface 41 of the third reflector 40 near the lower end of the light emitting surface 62 of the lens 60. Has a virtual focal point F3 ′ of the focal point F3.
この場合、図４に示すように、レンズ６０の光出射面６２の下端部に、その上側の光出射面６２の湾曲面の曲率よりも小さい曲率に設定されて前側にせり出した形状の小曲率面６２ｂからなる部分（小曲率部６２ａ）を有している。これにより、光源２から発せられてリフレクタ１０の第１反射面１１で前方から前方斜め下方の範囲に向けて照射された光がレンズ６０内を透過し光出射面６２の下側領域から出射されときの出射角が小さくなり、その分出射光を下側に下げるようにしている。 In this case, as shown in FIG. 4, the lower curvature of the light emitting surface 62 of the lens 60 is set to a curvature smaller than the curvature of the curved surface of the upper light emitting surface 62, and has a small curvature that protrudes to the front side. It has the part (small curvature part 62a) which consists of the surface 62b. Thereby, the light emitted from the light source 2 and irradiated on the first reflecting surface 11 of the reflector 10 from the front toward the obliquely lower front range is transmitted through the lens 60 and emitted from the lower region of the light emitting surface 62. The outgoing angle at that time becomes smaller, and the outgoing light is lowered downward accordingly.
つまり、第１反射面１１でレンズ６０の下部に向けて反射された反射光は、レンズ６０の光入射面６１の到達点においてその位置の法線に対する入射光の角度（入射角）がレンズ６０中央部よりも大きく、同様に、レンズ６０に入射してレンズ６０内の下側を透過して光出射面６２に到達した光も光出射面６２の到達点においその位置の法線に対する出射光の角度（入射角）が大きい。そのため、レンズ６０の下部からの出射光はレンズ６０の中央部からの出射光よりも屈折角が大きく色収差の影響も大きくなり、光の色分離の発生が顕著になる。 That is, the reflected light reflected toward the lower part of the lens 60 by the first reflecting surface 11 has an incident light angle (incident angle) with respect to the normal of the position at the arrival point of the light incident surface 61 of the lens 60. Similarly, the light that is larger than the central portion and that has entered the lens 60 and transmitted through the lower side of the lens 60 to reach the light exit surface 62 is also emitted at the arrival point of the light exit surface 62 with respect to the normal at that position. The angle (incident angle) is large. Therefore, the outgoing light from the lower part of the lens 60 has a refraction angle larger than that of the outgoing light from the central part of the lens 60, and the influence of chromatic aberration is increased, and the occurrence of color separation of light becomes remarkable.
特に、すれ違い配光パターンのカットオフラインを色分離した青色光が形成すると白色からはずれ法規不適合となるため、レンズ６０からの出射光を下方に下げることにより色収差の発生を抑制すると共に、色収差の大きい光を下方に向けることにより、主にレンズ６０中央部を透過した色収差の影響の少ない光によってカットオフラインを形成し色収差の影響の少ない配光パターンを形成するものである。 In particular, if blue light that is color-separated from the cut-off line of the passing light distribution pattern is formed, it will be out of white and incompatible with the laws and regulations. Therefore, by lowering the light emitted from the lens 60 downward, the occurrence of chromatic aberration is suppressed and the chromatic aberration is large. By directing light downward, a cut-off line is formed mainly by light having little influence of chromatic aberration transmitted through the central portion of the lens 60, and a light distribution pattern having little influence of chromatic aberration is formed.
同時に、焦点Ｆ３´を通る光も下方に向けるために、焦点Ｆ３´をレンズ６０の光出射面６２の小曲率部６２ａの小曲率面６２ｂ近傍位置に設定した。 At the same time, in order to direct light passing through the focal point F3 ′ downward, the focal point F3 ′ is set at a position near the small curvature surface 62b of the small curvature portion 62a of the light emitting surface 62 of the lens 60.
そこで、図５に示すように、一方の焦点Ｆ１の位置に位置する光源２から放射状に出射して光源２の上方に該光源２を覆うように位置する第１リフレクタ１０の回転楕円系反射面からなる第1反射面１１に向かう光は、第１反射面１１で前方から前方斜め下方の範囲に向けて反射されてその反射光が他方の焦点Ｆ２位置及びその近傍を通ってレンズ６０の光入射面６１の下側の面に照射される。 Therefore, as shown in FIG. 5, the spheroid reflection surface of the first reflector 10 that radiates from the light source 2 located at the position of one focal point F <b> 1 and covers the light source 2 above the light source 2. The light directed to the first reflecting surface 11 is reflected from the first reflecting surface 11 toward the obliquely lower front range from the front, and the reflected light passes through the position of the other focal point F2 and the vicinity thereof and is the light of the lens 60. The lower surface of the incident surface 61 is irradiated.
そして、レンズ６０の光入射面６１の下面に照射された光は、光入射面６１で屈折されてレンズ６０に入射し、レンズ６０内を透過し光出射面６２で再度屈折されて外部に出射される。 The light irradiated on the lower surface of the light incident surface 61 of the lens 60 is refracted by the light incident surface 61 and incident on the lens 60, passes through the lens 60, is refracted again by the light emitting surface 62, and is emitted to the outside. Is done.
特に、レンズ６０内を光出射面６２の下端部の面（小曲率面６２ｂ）に向けて透過した光は、小曲率面６２ｂからの出射時に、その上側の光出射面６２と同じ曲率の面から出射する光に比べて小さい屈折角で外部に出射される。 In particular, light that has passed through the lens 60 toward the lower end surface (small curvature surface 62b) of the light exit surface 62 has the same curvature as that of the upper light exit surface 62 when exiting from the small curvature surface 62b. The light is emitted to the outside with a smaller refraction angle than the light emitted from.
そのため、小曲率面６２ｂから外部に出射される、最も色収差の影響が大きい光が小曲面６２ｂによって下側に下げられてすれ違い配光パターンのカットオフラインの下側の部分を形成することになり、色収差の影響の少ない主配光パターンを形成することができる。 Therefore, the light having the greatest influence of chromatic aberration emitted from the small curvature surface 62b is lowered to the lower side by the small curved surface 62b to form the lower part of the cut-off line of the passing light distribution pattern. A main light distribution pattern with little influence of chromatic aberration can be formed.
つまり、光源２から第１リフレクタ１０の第1反射面１１に向けて出射された光は、第１反射面１１で反射されてその反射光がレンズ６０内の下側を透過してその出射光が図６及び図７に示すＡの、色収差の影響が抑制されたすれ違い配光パターン（主配光パターン）を形成する。 That is, the light emitted from the light source 2 toward the first reflecting surface 11 of the first reflector 10 is reflected by the first reflecting surface 11 and the reflected light passes through the lower side in the lens 60 and is emitted. 6A and 7B, a passing light distribution pattern (main light distribution pattern) in which the influence of chromatic aberration is suppressed is formed.
次に、一方の焦点Ｆ１の位置に位置する光源２から放射状に出射して光源２の前方斜め上方（第１リフレクタ１０の前端近傍）に位置する第２リフレクタ２０の回転楕円系反射面からなる第２反射面２１に向かう光は、第２反射面２１で他方の焦点Ｆ３に向けて反射されてその反射光が第３リフレクタ４０の第３反射面４１でレンズ６０の光入射面６１の下側の面に向けて反射される。 Next, the light beam 2 is emitted radially from the light source 2 located at the position of one focal point F1, and is composed of a spheroid reflection surface of the second reflector 20 located obliquely in front of the light source 2 (near the front end of the first reflector 10). The light traveling toward the second reflecting surface 21 is reflected by the second reflecting surface 21 toward the other focal point F3, and the reflected light is reflected by the third reflecting surface 41 of the third reflector 40 below the light incident surface 61 of the lens 60. Reflected toward the side surface.
そして、レンズ６０の光入射面６１の下面に照射された光は、光入射面６１で屈折されレンズ６０に入射し、レンズ６０内を、光出射面６２の下端部の面（小曲率面６２ｂ）近傍に位置する、焦点Ｆ３の仮想焦点Ｆ３´に向けて透過し、仮想焦点Ｆ３´位置で一旦集光されてその後拡散光が光出射面６２の小曲率面６２ｂで再度屈折されて外部に出射される。 The light irradiated on the lower surface of the light incident surface 61 of the lens 60 is refracted by the light incident surface 61 and incident on the lens 60, and the lens 60 has a lower end surface (small curvature surface 62b) in the light emitting surface 62. ) Transmits toward the virtual focal point F3 ′ of the focal point F3 located in the vicinity, once condensed at the virtual focal point F3 ′ position, and then the diffused light is refracted again by the small curvature surface 62b of the light emitting surface 62 to the outside. Emitted.
この場合も上記主配光パターンを形成する光と同様に、小曲率面６２ｂからの出射時に、その上側の光出射面６２と同じ曲率の面から出射する光に比べて小さい屈折角で外部に出射される。そのため、図８（従来の配光パターン）にあるような、主配光パターンＡとオーバーヘッドサイン配光パターンＢとが分離してその間に暗部領域７０を有する従来の配光パターンに対して、出射光が下側に下げられて配光パターンを従来の位置から下方に形成する。 Also in this case, like the light forming the main light distribution pattern, when the light is emitted from the small curvature surface 62b, the light is emitted to the outside with a smaller refraction angle than the light emitted from the surface having the same curvature as the light emission surface 62 on the upper side. Emitted. Therefore, the main light distribution pattern A and the overhead sign light distribution pattern B as shown in FIG. 8 (conventional light distribution pattern) are separated from the conventional light distribution pattern having the dark portion region 70 therebetween. The incident light is lowered to form a light distribution pattern downward from the conventional position.
つまり、光源２から第２リフレクタ２０の第２反射面２１に向けて出射された光は、第２反射面２１で反射されてその反射光が第３リフレクタ４０の第３反射面４１でレンズ６０の下側に向けて反射され、その反射光がレンズの下側を透過してその出射光が図６及び図７に示すＢの、主配光パターンＡの上部に重なるオーバーヘッドサイン配光パターンＢを形成する。 That is, the light emitted from the light source 2 toward the second reflecting surface 21 of the second reflector 20 is reflected by the second reflecting surface 21, and the reflected light is reflected by the third reflecting surface 41 of the third reflector 40 to the lens 60. The overhead sign light distribution pattern B is reflected toward the lower side, the reflected light is transmitted through the lower side of the lens, and the emitted light overlaps the upper part of the main light distribution pattern A in B shown in FIGS. Form.
これにより、主配光パターンＡとオーバーヘッドサイン配光パターンＢとの間に暗部が存在せず、夜間走行時の運転者の前方及び前方斜め上方の視認性が高まって運転者が車両前方の障害物を確実に認識することができる（図６参照）。 As a result, there is no dark portion between the main light distribution pattern A and the overhead sign light distribution pattern B, and the driver's front and obliquely upward visibility at the time of driving at night increases, so that the driver is obstructed in front of the vehicle. An object can be reliably recognized (see FIG. 6).
次に、光源２から放射状に出射して第２リフレクタ２０の前端部から前方に向かって斜め下方に延びる第４リフレクタ３０の第４反射面３１で焦点Ｆ３の後方側に向けて反射された反射光は、第３リフレクタ４０の第３反射面４１でレンズ６０の光入射面６１の中央の面に向けて反射される。 Next, the reflection that is emitted radially from the light source 2 and reflected toward the rear side of the focal point F3 by the fourth reflecting surface 31 of the fourth reflector 30 that extends obliquely downward from the front end portion of the second reflector 20 toward the front. The light is reflected by the third reflecting surface 41 of the third reflector 40 toward the center surface of the light incident surface 61 of the lens 60.
そして、レンズ６０の光入射面６１の中央面に照射された光は、光入射面６１で多少屈折されレンズ６０に入射し、レンズ６０内を光出射面６２の中央面に向けて透過し、中央面から前方斜め上方に向けて出射される。 The light applied to the central surface of the light incident surface 61 of the lens 60 is slightly refracted by the light incident surface 61 and enters the lens 60, and passes through the lens 60 toward the central surface of the light emitting surface 62. The light is emitted from the center plane toward the upper front obliquely upward.
これにより、従来の配光パターン（図８参照）に対して、図７にあるように、下方に下げられたオーバーヘッドサイン配光パターンＢの元あった領域をカバーするように、オーバーヘッドサイン用配光パターンの更なる上方領域を照射する配光パターン（補助配光パターンＣ）が形成される。 As a result, as shown in FIG. 7, the overhead sign distribution is arranged so as to cover the original area of the overhead sign distribution pattern B lowered downward as shown in FIG. A light distribution pattern (auxiliary light distribution pattern C) for illuminating a further upper region of the light pattern is formed.
その結果、主配光パターンＡとオーバーヘッドサイン配光パターンＢとの間に暗部が存在せず、且つ、下方に下げられたオーバーヘッドサイン配光パターンの従来の領域を照らすことにより、夜間走行時の運転者の、道路標識や道路案内板等の頭上標識が設けられたオーバーヘッドサイン領域に対する更なる視認性の向上を図ることができる。 As a result, there is no dark part between the main light distribution pattern A and the overhead sign light distribution pattern B, and by illuminating the conventional area of the overhead sign light distribution pattern lowered downward, The driver can further improve the visibility of the overhead sign area provided with overhead signs such as road signs and road guide boards.
以上説明したように、本発明の灯具は、すれ違い配光パターンの形成に寄与する第１リフレクタ１０の第１反射面１１と、オーバーヘッドサイン配光パターンの形成に寄与する第２リフレクタ２０の第２反射面２１及び第３リフレクタ４０の第３反射面４１を備え、焦点Ｆ２を通る光を平行光として前方に出射する形状を有すると共に、第１反射面１１の反射光の一部及び第２反射面２１で反射後に第３反射面４１で反射された反射光を下方に向ける部分（小曲率部６２ａ）の面（小曲率面６２ｂ）を有するレンズ６０を備えている。 As described above, the lamp of the present invention has the first reflecting surface 11 of the first reflector 10 that contributes to the formation of the passing light distribution pattern, and the second of the second reflector 20 that contributes to the formation of the overhead sign light distribution pattern. The reflection surface 21 and the third reflection surface 41 of the third reflector 40 are provided, have a shape that emits light passing through the focal point F2 forward as parallel light, and a part of the reflected light of the first reflection surface 11 and the second reflection. A lens 60 having a surface (small curvature surface 62b) of a portion (small curvature portion 62a) for directing reflected light reflected by the third reflection surface 41 downward after being reflected by the surface 21 is provided.
これにより、色収差の影響を抑制したすれ違い配光パターンが形成されると共に、すれ違い配光パターンとオーバーヘッドサイン配光パターンが繋がってその間に暗部が生じることがない。 As a result, a passing light distribution pattern in which the influence of chromatic aberration is suppressed is formed, and the passing light distribution pattern and the overhead sign light distribution pattern are connected to each other so that no dark portion is generated therebetween.
また、レンズ６０内に入射した光を下方に向ける小曲率部６２ａの小曲率面６２ｂをレンズ６０の下端部の光出射面６２に設けている。そのため、レンズ６０の必要最小限の部分的な変形によってすれ違い配光パターンの色収差の抑制とオーバーヘッドサイン配光パターンの下方移動が可能となり、レンズ６０の中央部を透過してすれ違い配光パターンの形成に寄与する光に悪影響を及ぼすことはない。 Further, a small curvature surface 62 b of the small curvature portion 62 a that directs light incident in the lens 60 downward is provided on the light emitting surface 62 at the lower end portion of the lens 60. Therefore, the chromatic aberration of the passing light distribution pattern can be suppressed and the overhead sign light distribution pattern can be moved downward by the minimum necessary partial deformation of the lens 60, and the passing light distribution pattern is formed through the center of the lens 60. It does not adversely affect the light that contributes to
更に、第２リフレクタ２０の第２反射面２１においては、前方側の面で反射された反射光ほど第３反射面４１の、焦点Ｆ２位置から前方側に遠ざかる位置に到達する。そのため、第２反射面２１の前端側に第４リフレクタ３０の第４反射面３１を、第２反射面２１よりも下方に向かって湾曲する湾曲反射面で構成し、従来第３反射面４１の、焦点Ｆ２から前方側の遠い位置に到達していた光を焦点Ｆ２寄りに向け、第３反射面４１で反射してレンズ６０内を透過し出射した光が前方斜め上方に向かうようにした。 Further, on the second reflecting surface 21 of the second reflector 20, the reflected light reflected by the front surface reaches the position of the third reflecting surface 41 that is further away from the focal point F2 position. Therefore, the 4th reflective surface 31 of the 4th reflector 30 is comprised in the front end side of the 2nd reflective surface 21 by the curved reflective surface which curves below the 2nd reflective surface 21, and the conventional 3rd reflective surface 41 of FIG. The light that had reached a far position on the front side from the focal point F2 was directed toward the focal point F2, and the light that was reflected by the third reflecting surface 41, transmitted through the lens 60 and emitted was directed obliquely upward to the front.
その結果、オーバーヘッドサイン配光パターンを下方移動した後の領域を補助配光パターンによって補足することにより全体として視認性が良好な配光パターンを形成することができる。 As a result, it is possible to form a light distribution pattern with good visibility as a whole by supplementing the area after the overhead sign light distribution pattern is moved downward with the auxiliary light distribution pattern.
なお、レンズ６０の光出射面６２の下端部に小曲率面６２ｂからなる小曲率部６２ａを設ける代わりに、図９（レンズ上端部の光出射面の部分拡大説明図）に示すように、レンズ６０の光出射面６２の上端部に、その下側の光出射面６２の湾曲面の曲率よりも大きい曲率に設定されて後側にせり出した形状の大曲率面６２ｄからなる大曲率部６２ｃを設けてもよい。 Instead of providing a small curvature portion 62a composed of a small curvature surface 62b at the lower end portion of the light exit surface 62 of the lens 60, as shown in FIG. 9 (partially enlarged explanatory view of the light exit surface of the lens upper end portion) A large curvature portion 62c comprising a large curvature surface 62d of a shape set to a curvature larger than the curvature of the curved surface of the lower light emission surface 62 and projecting to the rear side is provided at the upper end portion of the light emission surface 62 of 60. It may be provided.
この場合、焦点Ｆ３の仮想焦点Ｆ３´を、レンズ６０の光出射面６２の大曲率部６２ｃの大曲率面６２ｄ近傍位置に設定する。これにより、第３リフレクタ４０の第３反射面４１でレンズ６０の上側に向けて反射された反射光がレンズ６０内の上側を透過して大曲率面６２ｄからの出射光の向く方向が下側に下げられる。 In this case, the virtual focal point F3 ′ of the focal point F3 is set at a position near the large curvature surface 62d of the large curvature portion 62c of the light emitting surface 62 of the lens 60. Thereby, the reflected light reflected toward the upper side of the lens 60 by the third reflecting surface 41 of the third reflector 40 passes through the upper side of the lens 60 and the direction in which the emitted light from the large curvature surface 62d faces is lower. Is lowered.
また、レンズ６０の光出射面６２の一部の曲率を変えるのではなく、レンズ６０の光入射面６１の一部の曲率を変えてもよい。すなわち、レンズ６０の光入射面６１の下部に小曲率面からなる小曲率部を設け、焦点Ｆ３の仮想焦点Ｆ３´を、前記小曲率部近傍位置に設定する。もしくは、レンズ６０の光入射面６１の上部に大曲率面からなる大曲率部を設け、焦点Ｆ３の仮想焦点Ｆ３´を、前記大曲率部近傍位置に設定する。これにより、当該入射面を通過した光を下方向に向けることができる。 Further, instead of changing the curvature of a part of the light exit surface 62 of the lens 60, the curvature of a part of the light incident surface 61 of the lens 60 may be changed. That is, a small curvature portion composed of a small curvature surface is provided below the light incident surface 61 of the lens 60, and the virtual focal point F3 ′ of the focal point F3 is set at a position near the small curvature portion. Alternatively, a large curvature portion composed of a large curvature surface is provided above the light incident surface 61 of the lens 60, and the virtual focal point F3 ′ of the focal point F3 is set at a position near the large curvature portion. Thereby, the light that has passed through the incident surface can be directed downward.
その結果、オーバーヘッドサイン配光パターンの形成領域が下方に下げられて主配光パターンとオーバーヘッドサイン配光パターンの夫々の配光パターンが互いに部分的に重ね繋がって形成される。 As a result, the formation area of the overhead sign light distribution pattern is lowered downward, and the light distribution patterns of the main light distribution pattern and the overhead sign light distribution pattern are partially overlapped with each other.
なお、図１０の車両用灯具は、上述の実施形態の車両用灯具に対して、第３反射面４１の傾斜角度を変えて焦点Ｆ３の仮想焦点Ｆ３´がレンズ６０の光出射面６２の中央のやや下方に位置するようにして、第３反射面４１で反射した光が仮想焦点Ｆ３´の位置を通過するようにしている。また、仮想焦点Ｆ３´が位置する、レンズ６０の光出射面６２の一部を、焦点Ｆ２を通過した光を平行光とする曲率よりも小さい曲率に形成している。 Note that the vehicular lamp of FIG. 10 is different from the vehicular lamp of the above-described embodiment in that the virtual focal point F3 ′ of the focal point F3 is the center of the light emitting surface 62 of the lens 60 by changing the inclination angle of the third reflecting surface 41. The light reflected by the third reflecting surface 41 passes through the position of the virtual focal point F3 ′ so as to be located slightly below. Further, a part of the light emitting surface 62 of the lens 60 where the virtual focal point F3 ′ is located is formed to have a curvature smaller than the curvature that makes the light passing through the focal point F2 parallel light.
なお、仮想焦点Ｆ３´がレンズ６０の光出射面６２の中央のやや上方に位置するようにしてもよい。この場合は、仮想焦点Ｆ３´が位置する、レンズ６０の光出射面６２の一部を、焦点Ｆ２を通過した光を平行光とする曲率よりも大きい曲率に形成する。 Note that the virtual focal point F3 ′ may be positioned slightly above the center of the light emitting surface 62 of the lens 60. In this case, a part of the light exit surface 62 of the lens 60 where the virtual focal point F3 ′ is located is formed with a curvature larger than the curvature that makes the light passing through the focal point F2 parallel light.
その結果、レンズ６０の光出射面６２の中央のやや下方を通過する第３反射面４１からの光を下げることができ、オーバーヘッドサイン配光パターンをメイン配光パターンに繋げることができる。 As a result, the light from the third reflecting surface 41 passing slightly below the center of the light emitting surface 62 of the lens 60 can be lowered, and the overhead sign light distribution pattern can be connected to the main light distribution pattern.
この場合も、上述の実施形態と同様に、レンズ６０の光出射面６２の一部の曲率を変えるのではなく、レンズ６０の光入射面６１の一部の曲率を変えてもよい。これにより、レンズ６０の光入射面６１を通過した光を下方向に向けることができる。 Also in this case, as in the above-described embodiment, the curvature of a part of the light incident surface 61 of the lens 60 may be changed instead of changing the curvature of a part of the light emitting surface 62 of the lens 60. Thereby, the light that has passed through the light incident surface 61 of the lens 60 can be directed downward.
１… 車両用灯具
２… 光源
１０… 第１リフレクタ
１１… 第１リフレクタの反射面（第１反射面）
２０… 第２リフレクタ
２１… 第２リフレクタの反射面（第２反射面）
３０… 第４リフレクタ
３１… 第４リフレクタの反射面（第４反射面）
４０… 第３リフレクタ
４１… 第３リフレクタの反射面（第３反射面）
５０… シェード
６０… レンズ
６１… 光入射面
６２… 光出射面
６２ａ… 小曲率部
６２ｂ… 小曲率面
６２ｃ… 大曲率部
６２ｄ… 大曲率面
７０… 暗部領域
DESCRIPTION OF SYMBOLS 1 ... Vehicle lamp 2 ... Light source 10 ... 1st reflector 11 ... Reflective surface (1st reflective surface) of 1st reflector
20 ... 2nd reflector 21 ... Reflecting surface (2nd reflecting surface) of 2nd reflector
30 ... 4th reflector 31 ... Reflective surface (4th reflective surface) of 4th reflector
40 ... 3rd reflector 41 ... Reflective surface (3rd reflective surface) of 3rd reflector
50 ... Shade 60 ... Lens 61 ... Light entrance surface 62 ... Light exit surface 62a ... Small curvature portion 62b ... Small curvature surface 62c ... Large curvature portion 62d ... Large curvature surface 70 ... Dark region
Claims (6)
前記光源の上方に位置する第１反射面と、
前記第１反射面の前端近傍に位置する第２反射面と、
前記第２反射面の下方に位置する第３反射面と、
前記第３反射面の前方に位置するレンズと、
前記光源と前記レンズとの間に位置するシェードとを備え、
前記第１反射面は、前記光源の位置に第１焦点を有し、かつ、前記シェードの前端に第２焦点を有する回転楕円面を基調とする回転楕円系反射面であり、
前記第２反射面は、前記第１焦点を一方の焦点とし、かつ、前記第２反射面から前記第３反射面を通る略延長線上に他方の焦点となる第３焦点を有する回転楕円面を基調とする回転楕円系反射面を含み、
前記第３反射面は、前記第２焦点近傍の位置から前方斜め下方に向かって傾斜して延びる反射面であり、
前記レンズは、前記第２焦点を焦点とし、前記レンズ前面の光出射面の下側部分の少なくとも一部が、前記第２焦点を通過した光を平行光とする曲率よりも小さい曲率に形成された形状を有し、かつ、前記レンズ前面の光出射面の下部近傍に前記第３焦点の仮想焦点が位置する投影型レンズである、車両用灯具。 A light source;
A first reflecting surface located above the light source;
A second reflecting surface located near the front end of the first reflecting surface;
A third reflecting surface located below the second reflecting surface;
A lens positioned in front of the third reflecting surface;
A shade located between the light source and the lens;
The first reflecting surface is a spheroid reflecting surface based on a spheroid having a first focal point at the position of the light source and a second focal point at the front end of the shade;
The second reflecting surface is a spheroid surface having the first focal point as one focal point and a third focal point serving as the other focal point on a substantially extended line passing from the second reflecting surface through the third reflecting surface. Including a spheroid reflecting surface
The third reflecting surface is a reflecting surface that extends obliquely downward and forward from a position near the second focal point,
The lens has the second focal point as a focal point, and at least a part of the lower portion of the light emitting surface on the front surface of the lens is formed to have a curvature smaller than a curvature of parallel light that has passed through the second focal point. A vehicular lamp, which is a projection lens having a shape that has a virtual focal point of the third focal point in the vicinity of the lower part of the light emitting surface on the front surface of the lens.
前記光源の上方に位置する第１反射面と、
前記第１反射面の前端近傍に位置する第２反射面と、
前記第２反射面の下方に位置する第３反射面と、
前記第３反射面の前方に位置するレンズと、
前記光源と前記レンズとの間に位置するシェードとを備え、
前記第１反射面は、前記光源の位置に第１焦点を有し、かつ、前記シェードの前端に第２焦点を有する回転楕円面を基調とする回転楕円系反射面であり、
前記第２反射面は、前記第１焦点を一方の焦点とし、かつ、前記第２反射面から前記第３反射面を通る略延長線上に他方の焦点となる第３焦点を有する回転楕円面を基調とする回転楕円系反射面を含み、
前記第３反射面は、前記第２焦点近傍の位置から前方斜め下方に向かって傾斜して延びる反射面であり、
前記レンズは、前記第２焦点を焦点とし、前記レンズ後面の光入射面の下側部分の少なくとも一部が、前記第２焦点を通過した光を平行光とする曲率よりも小さい曲率に形成された形状を有し、かつ、前記レンズ後面の光入射面の下部近傍に前記第３焦点の仮想焦点が位置する投影型レンズである、車両用灯具。 A light source;
A first reflecting surface located above the light source;
A second reflecting surface located near the front end of the first reflecting surface;
A third reflecting surface located below the second reflecting surface;
A lens positioned in front of the third reflecting surface;
A shade located between the light source and the lens;
The first reflecting surface is a spheroid reflecting surface based on a spheroid having a first focal point at the position of the light source and a second focal point at the front end of the shade;
The second reflecting surface is a spheroid surface having the first focal point as one focal point and a third focal point serving as the other focal point on a substantially extended line passing from the second reflecting surface through the third reflecting surface. Including a spheroid reflecting surface
The third reflecting surface is a reflecting surface that extends obliquely downward and forward from a position near the second focal point,
The lens has the second focal point as a focal point, and at least a part of a lower portion of the light incident surface on the rear surface of the lens is formed to have a curvature smaller than a curvature with the light passing through the second focal point as parallel light. And a vehicular lamp that is a projection lens in which the virtual focal point of the third focal point is located near the lower part of the light incident surface on the rear surface of the lens.
前記光源の上方に位置する第１反射面と、
前記第１反射面の前端近傍に位置する第２反射面と、
前記第２反射面の下方に位置する第３反射面と、
前記第３反射面の前方に位置するレンズと、
前記光源と前記レンズとの間に位置するシェードとを備え、
前記第１反射面は、前記光源の位置に第１焦点を有し、かつ、前記シェードの前端に第２焦点を有する回転楕円面を基調とする回転楕円系反射面であり、
前記第２反射面は、前記第１焦点を一方の焦点とし、かつ、前記第２反射面から前記第３反射面を通る略延長線上に他方の焦点となる第３焦点を有する回転楕円面を基調とする回転楕円系反射面を含み、
前記第３反射面は、前記第２焦点近傍の位置から前方斜め下方に向かって傾斜して延びる反射面であり、
前記レンズは、前記第２焦点を焦点とし、前記レンズ前面の光出射面の上側部分の少なくとも一部が、前記第２焦点を通過した光を平行光とする曲率よりも大きい曲率に形成された形状を有し、かつ、前記レンズ前面の光出射面の上部近傍に前記第３焦点の仮想焦点が位置する投影型レンズである、車両用灯具。 A light source;
A first reflecting surface located above the light source;
A second reflecting surface located near the front end of the first reflecting surface;
A third reflecting surface located below the second reflecting surface;
A lens positioned in front of the third reflecting surface;
A shade located between the light source and the lens;
The first reflecting surface is a spheroid reflecting surface based on a spheroid having a first focal point at the position of the light source and a second focal point at the front end of the shade;
The second reflecting surface is a spheroid surface having the first focal point as one focal point and a third focal point serving as the other focal point on a substantially extended line passing from the second reflecting surface through the third reflecting surface. Including a spheroid reflecting surface
The third reflecting surface is a reflecting surface that extends obliquely downward and forward from a position near the second focal point,
The lens has the second focal point as a focal point, and at least a part of the upper portion of the light emitting surface on the front surface of the lens is formed to have a curvature larger than a curvature that makes the light passing through the second focal point parallel light. A vehicular lamp, which is a projection type lens having a shape and having a virtual focal point of the third focal point located in the vicinity of the upper part of the light emitting surface of the front surface of the lens.
前記光源の上方に位置する第１反射面と、
前記第１反射面の前端近傍に位置する第２反射面と、
前記第２反射面の下方に位置する第３反射面と、
前記第３反射面の前方に位置するレンズと、
前記光源と前記レンズとの間に位置するシェードとを備え、
前記第１反射面は、前記光源の位置に第１焦点を有し、かつ、前記シェードの前端に第２焦点を有する回転楕円面を基調とする回転楕円系反射面であり、
前記第２反射面は、前記第１焦点を一方の焦点とし、かつ、前記第２反射面から前記第３反射面を通る略延長線上に他方の焦点となる第３焦点を有する回転楕円面を基調とする回転楕円系反射面を含み、
前記第３反射面は、前記第２焦点近傍の位置から前方斜め下方に向かって傾斜して延びる反射面であり、
前記レンズは、前記第２焦点を焦点とし、前記レンズ後面の光入射面の上側部分の少なくとも一部が、前記第２焦点を通過した光を平行光とする曲率よりも大きい曲率に形成された形状を有し、かつ、前記レンズ後面の光入射面の上部近傍に前記第３焦点の仮想焦点が位置する投影型レンズである、車両用灯具。 A light source;
A first reflecting surface located above the light source;
A second reflecting surface located near the front end of the first reflecting surface;
A third reflecting surface located below the second reflecting surface;
A lens positioned in front of the third reflecting surface;
A shade located between the light source and the lens;
The first reflecting surface is a spheroid reflecting surface based on a spheroid having a first focal point at the position of the light source and a second focal point at the front end of the shade;
The second reflecting surface is a spheroid surface having the first focal point as one focal point and a third focal point serving as the other focal point on a substantially extended line passing from the second reflecting surface through the third reflecting surface. Including a spheroid reflecting surface
The third reflecting surface is a reflecting surface that extends obliquely downward and forward from a position near the second focal point,
The lens has the second focal point as a focal point, and at least a part of the upper portion of the light incident surface on the rear surface of the lens is formed to have a curvature larger than a curvature with the light passing through the second focal point as parallel light. A vehicular lamp, which is a projection type lens having a shape and having a virtual focal point of the third focal point located in the vicinity of the upper part of the light incident surface on the rear surface of the lens.
前記第４反射面は前記第２反射面の前端近傍に対して内側に湾曲傾斜し、前記光源からの光を前記第３焦点より後方へ反射するようにした反射面である、請求項１から請求項４のいずれか１項に記載の車両用灯具。 A fourth reflective surface in the vicinity of the front end of the second reflective surface;
The fourth reflective surface is a reflective surface that is curved and inclined inward with respect to the vicinity of the front end of the second reflective surface, and reflects light from the light source backward from the third focal point. The vehicular lamp according to claim 4.
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| US11578850B2 (en) | 2020-12-22 | 2023-02-14 | Nichia Corporation | Lighting device |
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