JP2004241142A - Light source and vehicular headlamp - Google Patents

Light source and vehicular headlamp Download PDF

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Publication number
JP2004241142A
JP2004241142A JP2003026036A JP2003026036A JP2004241142A JP 2004241142 A JP2004241142 A JP 2004241142A JP 2003026036 A JP2003026036 A JP 2003026036A JP 2003026036 A JP2003026036 A JP 2003026036A JP 2004241142 A JP2004241142 A JP 2004241142A
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Prior art keywords
light
phosphor
semiconductor
light source
light emitting
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JP2003026036A
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JP4124445B2 (en
Inventor
Kazutami Oishi
和民 大石
Kiyoshi Sazuka
清 佐塚
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Koito Manufacturing Co Ltd
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Koito Manufacturing Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/16Laser light sources
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/176Light sources where the light is generated by photoluminescent material spaced from a primary light generating element

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source and a vehicular headlamp composed by suitably forming a light distribution pattern. <P>SOLUTION: This light source for generating light is provided with: a phosphor for emitting light according to light radiated from the outside; and a light irradiation part for making the phosphor emit light by irradiating the phosphor with light from a plurality of different directions. The light irradiation part has a semiconductor light emitting element for generating light to the phosphor from a predetermined light emitting region, and a projection area of the phosphor in a direction from the phosphor toward the semiconductor light emitting element may be smaller than that of the light emitting region. The light irradiation part may have a semiconductor light emitting element installed separately from the phosphor, and a condenser lens for condensing the light generated by the semiconductor light emitting element on the phosphor. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、光源及び車両用前照灯に関する。特に本発明は、光を発生する光源に関する。
【0002】
【従来の技術】
車両用前照灯においては、安全上の観点から、高い精度で配光パターンを形成することが必要である。この配光パターンは、例えば反射鏡又はレンズ等を用いた光学系により形成される(例えば、特許文献1参照。)。
【0003】
【特許文献1】
特開平6―89601号公報(第3−7頁、第1−14図)
【0004】
【発明が解決しようとする課題】
配光パターンを高い精度で形成するための光学系の設計においては、光源の大きさが小さい方が好ましい場合がある。そのため、従来、光源が大きいために光学系設計が複雑化し、適切な配光パターンを形成するのが困難な場合があった。
【0005】
そこで本発明は、上記の課題を解決することのできる光源及び車両用前照灯を提供することを目的とする。この目的は特許請求の範囲における独立項に記載の特徴の組み合わせにより達成される。また従属項は本発明の更なる有利な具体例を規定する。
【0006】
【課題を解決するための手段】
即ち、本発明の第1の形態によると、光を発生する光源であって、外部から照射される光に応じて発光する蛍光体と、異なる複数の方向から蛍光体に光を照射することにより、蛍光体を発光させる光照射部とを備える。
【0007】
また、光照射部は、予め定められた発光領域から蛍光体に対して光を発生する半導体発光素子を有し、蛍光体から半導体発光素子に向かう方向への、蛍光体の投影面積は、当該発光領域の面積より小さくてよい。
【0008】
また、光照射部は、蛍光体から離間して設けられた半導体発光素子と、半導体発光素子が発生する光を、蛍光体に集光する集光レンズとを有してよい。光照射部は、複数の半導体発光素子と、複数の半導体発光素子に対応してそれぞれ設けられ、対応する半導体発光素子が発生する光を、蛍光体にそれぞれ集光する複数の集光レンズとを有してよい。
【0009】
また、蛍光体は、当該蛍光体が発生する光を反射又は偏向するために設けられた光学部材に向かって光を発生し、光照射部は、蛍光体から光学部材へ至る光路の外側に設けられてよい。
【0010】
また、光照射部は、蛍光体に向けて、それぞれ異なる方向から光を照射する複数の半導体レーザを有してよい。
【0011】
また、光照射部は、少なくとも活性層の一部まで達する深さの溝が形成された半導体発光素子を有し、蛍光体は、当該溝の中央近傍に設けられてよい。
【0012】
また、蛍光体は、当該蛍光体の近傍に光学的中心を有し、かつ、車両用前照灯が照射する光を照射するために用いられる光学部材に向かって光を発生してよい。
【0013】
本発明の第2の形態によると、車両に用いられる車両用前照灯であって、外部から照射される光に応じて発光する蛍光体と、異なる複数の方向から蛍光体に光を照射することにより、蛍光体を発光させる光照射部と、蛍光体の近傍に光学的中心を有する光学部材とを備える。
【0014】
なお上記の発明の概要は、本発明の必要な特徴の全てを列挙したものではなく、これらの特徴群のサブコンビネーションも又発明となりうる。
【0015】
【発明の実施の形態】
以下、発明の実施の形態を通じて本発明を説明するが、以下の実施形態は特許請求の範囲にかかる発明を限定するものではなく、又実施形態の中で説明されている特徴の組み合わせの全てが発明の解決手段に必須であるとは限らない。
【0016】
図1は、本発明の一実施形態に係る車両用灯具400の構成の一例を示す。車両用灯具400は、例えば、車両の前方の予め定められた照射方向に光を照射するロービーム照射用の車両用前照灯(ヘッドランプ)である。本例の車両用灯具400は、高い精度で制御された光を照射することにより、適切な配光パターンを形成することを目的とする。車両用灯具400は、素通し状の透明カバー402とランプボディー404とで形成される灯室内に、複数の光源ユニット100を略横一列に収容する。
【0017】
これらの光源ユニット100は、同一又は同様の構成を有し、光軸を、車両前後方向に対して、車両用灯具400を車体に取り付けた場合に0.3〜0.6°程度下向きとなるように、灯室内に収容されている。車両用灯具400は、これらの光源ユニット100が照射する光に基づき、車両の前方に光を照射して、所定の配光パターンを形成する。車両用灯具400は、それぞれ異なる配光特性を有する複数の光源ユニット100を備えてもよい。
【0018】
図2及び図3は、光源ユニット100の構成の一例を示す。図2は、光源ユニット100のBB垂直断面図を示す。図3は、光源ユニット100のAA水平断面図を示す。本例の光源ユニット100は、光軸寄りに集光反射させた光を、レンズを介して前方に照射するプロジェクタ型の光源ユニットであり、蛍光体204、光照射部202、LED支持部206、水平反射部118、投影レンズ104、及びリフレクタ114を有する。蛍光体204及び光照射部202は、光源ユニット100に設けられた光源を構成する。
【0019】
蛍光体204は、例えば水平反射部118の後端等の、予め定められた位置に設けられ、光照射部202から照射される光に応じて、その光と異なる波長の光を、リフレクタ114に向かって発生する。本例において、蛍光体204は、紫外光に応じて赤色光、緑色光、及び青色光をそれぞれ発生する蛍光物質により、形成される。蛍光体204は、赤色光、緑色光、及び青色光をそれぞれ略同じ強さで発生することにより、白色光を発生する。
【0020】
他の例において、蛍光体204は、例えば、イットリウム、アルミニウム、ガーネット系(YAG)からなるYAG蛍光物質により形成されてもよい。この場合、蛍光体204は、青色光に応じて、その青色光の補色である黄色光を発生する。
【0021】
光照射部202は、複数のLEDモジュール210、及び複数の集光レンズ208を含む。他の例において、光照射部202は、一組のLEDモジュール210及び集光レンズ208を含んでもよい。
【0022】
LEDモジュール210は、半導体発光素子102及び封止部材108を有する。半導体発光素子102は、蛍光体204から離間して設けられた発光ダイオード素子である。本例において、半導体発光素子102は、例えば、予め定められた発光領域から蛍光体204に対して、例えば波長が400nm以下程度の紫外光を照射する。これにより、半導体発光素子102は、蛍光体204に白色光を発生させる。また、光源ユニット100は、蛍光体204が発生する白色光を、車両の前方に照射する。この場合、光源ユニット100は、例えば自動車用前照灯規格(JIS D5500)で規定される白色光領域の白色光を照射するのが好ましい。
【0023】
他の例において、半導体発光素子102は、例えばYAG蛍光物質により形成された蛍光体204に対して、例えば波長420〜480nm程度の青色光を照射してもよい。これにより、半導体発光素子102は、蛍光体204に、黄色光を発生させる。光源ユニット100は、半導体発光素子102及び蛍光体204がそれぞれ発生する青色光及び黄色光に基づき、白色光を照射する。
【0024】
封止部材108は、LEDモジュール210における樹脂モールドであり、例えば透明樹脂等により形成され、半導体発光素子102を封止する。また、封止部材108は、半導体発光素子102が発生する光を集光レンズ208に向かって透過させる。
【0025】
複数の集光レンズ208は、複数のLEDモジュール210にそれぞれ含まれる半導体発光素子102に対応してそれぞれ設けられ、対応する半導体発光素子102が発生する光を、蛍光体204にそれぞれ集光する。この場合、それぞれの集光レンズ208は、対応する半導体発光素子102が複数の方向に向かって発生する光を、蛍光体204に向かって偏向することにより、異なる複数の方向から蛍光体204に照射する。また、これにより、光照射部202は、蛍光体204を発光させる。
【0026】
尚、他の例においては、封止部材108が集光レンズ208の機能を有してもよい。この場合、封止部材108は、半導体発光素子102が発生する光を、蛍光体204に向かって偏向する。
【0027】
ここで、例えば半導体発光素子102を覆うように蛍光体204を形成するとすれば、蛍光体204の大きさは、半導体発光素子102の表面より略大きくなる。しかし、本例において、半導体発光素子102から離間して設けられた蛍光体204は、集光レンズ208により集光された紫外光を受ける。そのため、半導体発光素子102の大きさが、例えば数mm角程度以上である場合でも、本例によれば、半導体発光素子102の大きさによらず、蛍光体204を、例えば直径が0.5mm以下程度の小さな点状に形成することができる。これにより、小さな点状の領域から白色光を発生する光源を、適切に形成することができる。
【0028】
本例において、蛍光体204から半導体発光素子102に向かう方向への、蛍光体204の投影面積は、半導体発光素子102における発光領域の面積より小さい。そのため、光源ユニット100は、小さな領域に設けられた蛍光体204が発生する光に基づき、配光パターンを形成する。この場合、光源ユニット100は、適切な配光パターンを、高い精度で形成することができる。また、この場合、小さな領域からの発光に基づく光学設計を行うため、光源ユニット100の光学設計を、簡易に行うことができる。
【0029】
LED支持部206は、集光レンズ208及び複数のLEDモジュール210を挟んで蛍光体204と対向して、蛍光体204より車両の後方に設けられ、複数のLEDモジュール210を支持して固定する。また、LED支持部206は、更に、複数の集光レンズ208を支持して固定してよい。
【0030】
LED支持部206は、光照射部202を、蛍光体204からリフレクタ114へ至る光路の外側に固定するのが好ましい。この場合、蛍光体204が発生する光を、リフレクタ114に、効率よく入射させることができる。
【0031】
水平反射部118は、略水平な上面において光を反射する反射鏡であり、光照射部202と投影レンズ104との間に設けられ、後端近傍に蛍光体204を裁置する。また、水平反射部118の前縁は、車両の略左右方向に延伸する略直線状である。当該前縁は、例えば略への字状等であってもよい。
【0032】
投影レンズ104は、水平反射部118及びリフレクタ114に対して車両前方に設けられ、水平反射部118又はリフレクタ114が反射する光を透過して前方の照射方向に照射する。本例において、投影レンズ104は、水平反射部118の前縁近傍に焦点を有し、この焦点を含む焦点面の像を車両前方に投影することにより、車両用灯具400(図1参照)の配光パターンの少なくとも一部を形成する。この場合、投影レンズ104は、水平反射部118の前縁形状に基づき、当該配光パターンにおける明暗境界であるカットラインの少なくとも一部を形成する。投影レンズ104は、例えば、略への字状の前縁形状に基づき、略への字状のカットラインを形成する。
【0033】
リフレクタ114は、蛍光体204が発生する光を反射又は偏向するために設けられた光学部材の一例であり、蛍光体204の後方、側方、及び上方を囲むように設けられる。そして、リフレクタ114は、蛍光体204が発生する光を前方に反射することにより、投影レンズ104に入射させ、投影レンズ104に、当該光を、照射方向に照射させる。これにより、リフレクタ114は、蛍光体204が発生する光を、照射方向に照射する。このように、リフレクタ114は、車両用灯具400が照射する光を照射するために用いられる。
【0034】
ここで、リフレクタ114の少なくとも一部は、例えば複合楕円面等により形成された略楕円球面状である。そして、この略楕円球面は、光源ユニット100の光軸を含む断面形状が略楕円形状の少なくとも一部となるように設定されている。また、この略楕円形状の離心率は、鉛直断面から水平断面へ向けて徐々に大きくなるように設定されている。尚、光源ユニット100は、投影レンズ104の略中心を通過して車両略前方に向かう光軸を有する。
【0035】
また、リフレクタ114は、蛍光体204の近傍に、例えば焦点又は光学設計上の基準点等である光学的中心を有する。本例において、リフレクタ114の略楕円球面状部分は、蛍光体204の近傍に、焦点F1を有し、水平反射部118の前端近傍に焦点F2を有する。この場合、当該略楕円球面状の部分は、蛍光体204が発生する光の少なくとも大部分を、水平反射部118の前縁近傍に集光する。
【0036】
この場合、当該前縁近傍には、前縁形状に基づく明確な明暗境界が形成されるため、当該前縁近傍に焦点を有する投影レンズ104は、配光パターンのカットライン近傍に、明確な明暗境界を有する光を照射する。そのため、本例によれば、明確なカットライン有する配光パターンを適切に形成することができる。
【0037】
尚、他の例において、リフレクタ114は、蛍光体204の近傍に焦点を有する放物面状の反射鏡であってもよい。この場合、光源ユニット100は、放物面(パラボラ)状の反射鏡を用いて光を前方に照射するパラボラ型の光源ユニットであってよく、投影レンズ104に代えて、例えば素通し状の透明カバーを有する。この場合も、光源ユニット100は、高い精度で制御された光を前方に照射する。
【0038】
図4は、光源ユニット100により形成される配光パターン502の一例を示す概念図である。配光パターン502は、光源ユニット100の前方25mの位置に配置された仮想鉛直スクリーン上に形成されるロービーム配光パターンである。
【0039】
本例において、投影レンズ104は、蛍光体204が発生する光を仮想鉛直スクリーン上に投影することにより、水平カットライン504及び斜めカットライン506により明暗境界が定められた配光パターン502を形成する。投影レンズ104は、水平反射部118(図2参照)の前縁形状に基づき、水平カットライン504及び斜めカットライン506を形成する。
【0040】
ここで、図2及び図3を用いて説明したように、リフレクタ114は、小さな領域に設けられた蛍光体204が発生する光を、高い精度で水平反射部118の前縁近傍に集光する。そのため、投影レンズ104は、仮想鉛直スクリーン上に、水平カットライン504及び斜めカットライン506を明確に投影する。本例によれば、配光パターン502を適切かつ高精度に形成することができる。
【0041】
尚、他の例においては、車両用灯具400(図1参照)が、それぞれ異なる配光特性を有する複数の光源ユニット100が発生する光に基づき、配光パターン502を形成してもよい。この場合、それぞれの光源ユニット100は、配光パターン502における一部の領域を照射してよい。
【0042】
図5及び図6は、光源ユニット100の構成の他の例を示す。図5は、光源ユニット100のBB水平断面図を示す。図6は、光源ユニット100のAA垂直断面図を示す。本例の光源ユニット100は、光源が発生する光を、投影レンズ104により前方に照射するプロジェクタ型の光源ユニットであり、蛍光体204、光照射部202、支持部材110、遮光部材112、及び投影レンズ104を有する。
【0043】
蛍光体204及び光照射部202は、図2及び図3を用いて説明した蛍光体204及び光照射部202と同一又は同様の機能を有し、光源ユニット100における光源を構成する。蛍光体204は、支持部材110の表面に、投影レンズ104に向かって固定され、光照射部202が発生する光に応じて、その光と異なる波長の光を、投影レンズ104に向かって発生する。
【0044】
光照射部202は、それぞれ半導体発光素子102及び封止部材108を含む複数のLEDモジュール210を有する。本例において、封止部材108は、図1を用いて説明した集光レンズ208と同一又は同様の機能を有し、半導体発光素子102が発生する光を、蛍光体204に向かって偏向する。他の例において、光照射部202は、複数のLEDモジュール210に対応して設けられた複数の封止部材108を更に有してもよい。
【0045】
本例において、複数のLEDモジュール210は、遮光部材112における後方の面に固定され、車両の更に後方に設けられた蛍光体204に向かって光を照射する。この場合、光照射部202は、蛍光体204から投影レンズ104へ至る光路の外側に固定されるため、蛍光体204が発生する光を、投影レンズ104に、効率よく入射させることができる。
【0046】
支持部材110は、車両の前方を向く表面上に蛍光体204を支持して固定する板状体である。遮光部材112は、蛍光体204の近傍に、蛍光体204を略挟んで支持部材110の表面と対向して設けられた板状体であり、蛍光体204が発生する光の一部を上縁において遮ることにより、当該上縁の正面方向への投影形状に基づき、投影レンズ104に入射する光の明暗境界を規定する。当該投影形状は、例えば、車両の略左右方向に延伸する直線状である。当該投影形状は、略への字状であってよい。
【0047】
投影レンズ104は、蛍光体204が発生する光を反射又は偏向するために設けられた光学部材の一例であり、蛍光体204が発生する光を透過することにより、当該光を、車両前方の照射方向に照射する。
【0048】
本例において、投影レンズ104は、蛍光体204の近傍に光学的中心を有する。この場合、投影レンズ104は、小さな領域に設けられた蛍光体204が発生する光に基づき、高い精度で制御された光を前方に照射することができる。投影レンズ104は、蛍光体204の近傍の一例として、例えば遮光部材112の上縁近傍に光学的中心を有してよい。
【0049】
光源ユニット100は、投影レンズ104が照射する光に基づき、車両用灯具400(図1参照)の配光パターンの少なくとも一部を形成する。そのため、本例によれば、適切な配光パターンを、高い精度で形成することができる。尚、上記の点を除き、図5及び図6において、図2及び図3と同じ符号を付した構成は、図2及び図3における構成と同一又は同様の機能を有するため説明を省略する。
【0050】
図7は、光照射部202の構成の他の例を示す。本例の光照射部202は、LEDモジュール210に代えて、それぞれ半導体発光素子102を含む複数の半導体レーザモジュール120を有する。本例において、半導体発光素子102は、例えば紫外光又は青色光等のレーザ光を発生する半導体レーザ素子である。
【0051】
この場合、複数の半導体レーザモジュール120は、蛍光体204に向けて、それぞれ異なる方向からレーザ光を照射する。そのため、本例によれば、蛍光体204に多量の光を照射することができる。また、これにより、小さな領域に設けられた蛍光体204を、高い輝度で発光させることができる。
【0052】
尚、上記の点を除き、図7において、図2及び図3、又は図5及び図6と同じ符号を付した構成は、これらの図における構成と同一又は同様の機能を有するため説明を省略する。この光照射部202及び蛍光体204は、図2及び図3、又は図5及び図6を用いて説明した光源ユニット100に用いられてよい。これらの場合も、この光源ユニット100は、適切な配光パターンを形成することができる。
【0053】
また、光照射部202は、複数の半導体レーザモジュール120に対応して設けられた複数の集光レンズを更に有してもよい。これらの集光レンズは、対応する半導体レーザモジュール120が発生するレーザ光を、蛍光体204にそれぞれ集光する。この場合、複数の半導体レーザモジュール120が発生するレーザ光を、更に小さな領域に集光することができる。
【0054】
図8は、光照射部202の構成の更なる他の例を示す。本例の光照射部202は、例えば発光ダイオード素子である半導体発光素子302を含む。半導体発光素子302は、活性層304及び溝306を含む。活性層304は、半導体発光素子302内に形成されたPN接合を含む層であり、半導体発光素子302に供給される電力に応じて、例えば紫外光や青色光等の、そのPN接合の特性により定められた波長の光を発生する。
【0055】
溝306は、半導体発光素子302の表面に略直線状に延伸する開口部を有して形成され、その深さは、少なくとも活性層304一部まで達する。この場合、半導体発光素子302は、活性層304において発生した光を、溝306から外部に照射する。
【0056】
蛍光体204は、半導体発光素子302の表面において、溝306の中央近傍に設けられる。この場合、半導体発光素子302は、溝306の開口部より小さな領域に形成された蛍光体204に、蛍光体204の下方に延伸する溝306の略全体から光を照射する。そのため、本例においても、光照射部202は、異なる複数の方向から蛍光体204に光を照射する。蛍光体204は、溝306から照射される光に応じて、白色光や黄色光等を発生する。
【0057】
尚、上記の点を除き、図8において、図2及び図3、又は図5及び図6と同じ符号を付した構成は、これらの図における構成と同一又は同様の機能を有するため説明を省略する。この光照射部202及び蛍光体204は、図2及び図3、又は図5及び図6を用いて説明した光源ユニット100に用いられてよい。これらの場合も、この光源ユニット100は、適切な配光パターンを形成することができる。尚、この光照射部202及び蛍光体204は、図2及び図3、又は図5及び図6において蛍光体204が設けられている位置の近傍に設けられてよい。
【0058】
以上、本発明を実施の形態を用いて説明したが、本発明の技術的範囲は上記実施の形態に記載の範囲には限定されない。上記実施の形態に、多様な変更又は改良を加えることができる。その様な変更又は改良を加えた形態も本発明の技術的範囲に含まれ得ることが、特許請求の範囲の記載から明らかである。
【0059】
上記説明から明らかなように、本発明によれば配光パターンを適切に形成することができる。
【図面の簡単な説明】
【図1】本発明の一実施形態に係る車両用灯具400の構成の一例を示す図である。
【図2】光源ユニット100のBB垂直断面図を示す図である。
【図3】光源ユニット100のAA水平断面図を示す図である。
【図4】配光パターン502の一例を示す概念図である。
【図5】光源ユニット100のBB水平断面図を示す図である。
【図6】光源ユニット100のAA垂直断面図を示す図である。
【図7】光照射部202の構成の他の例を示す図である。
【図8】光照射部202の構成の更なる他の例を示す図である。
【符号の説明】
100・・・車両用灯具、102・・・半導体発光素子、104・・・投影レンズ、108・・・封止部材、110・・・支持部材、112・・・遮光部材、114・・・リフレクタ、118・・・水平反射部、120・・・半導体レーザモジュール、202・・・光照射部、204・・・蛍光体、206・・・LED支持部、208・・・集光レンズ、210・・・LEDモジュール、302・・・半導体発光素子、304・・・活性層、306・・・溝、400・・・車両用灯具、402・・・透明カバー、404・・・ランプボディー、502・・・配光パターン、504・・・水平カットライン、506・・・斜めカットライン
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a light source and a vehicle headlamp. In particular, the invention relates to a light source that generates light.
[0002]
[Prior art]
In a vehicle headlamp, it is necessary to form a light distribution pattern with high accuracy from the viewpoint of safety. This light distribution pattern is formed by an optical system using, for example, a reflecting mirror or a lens (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-6-89601 (page 3-7, FIG. 1-14)
[0004]
[Problems to be solved by the invention]
In designing an optical system for forming a light distribution pattern with high accuracy, it is sometimes preferable that the size of the light source is small. Therefore, conventionally, the design of the optical system was complicated due to the large light source, and it was sometimes difficult to form an appropriate light distribution pattern.
[0005]
Therefore, an object of the present invention is to provide a light source and a vehicular headlamp that can solve the above-described problems. This object is achieved by a combination of features described in the independent claims. The dependent claims define further advantageous embodiments of the present invention.
[0006]
[Means for Solving the Problems]
That is, according to the first embodiment of the present invention, the light source is a light source that emits light and emits light in response to light emitted from the outside, and emits light to the phosphor from a plurality of different directions. And a light irradiating unit for causing the phosphor to emit light.
[0007]
The light irradiation unit has a semiconductor light emitting element that emits light to the phosphor from a predetermined light emitting region, and a projected area of the phosphor in a direction from the phosphor to the semiconductor light emitting element is the projection area. It may be smaller than the area of the light emitting region.
[0008]
Further, the light irradiation section may include a semiconductor light emitting element provided separately from the phosphor, and a condenser lens for condensing light generated by the semiconductor light emitting element on the phosphor. The light irradiating unit includes a plurality of semiconductor light emitting elements and a plurality of condensing lenses which are provided corresponding to the plurality of semiconductor light emitting elements, respectively, and collect light generated by the corresponding semiconductor light emitting elements onto the phosphor. May have.
[0009]
Further, the phosphor generates light toward an optical member provided to reflect or deflect light generated by the phosphor, and a light irradiation unit is provided outside an optical path from the phosphor to the optical member. May be.
[0010]
Further, the light irradiating unit may include a plurality of semiconductor lasers that irradiate the phosphor with light from different directions.
[0011]
Further, the light irradiation section may include a semiconductor light emitting element in which a groove having a depth reaching at least a part of the active layer is formed, and the phosphor may be provided near the center of the groove.
[0012]
Further, the phosphor may have an optical center in the vicinity of the phosphor, and may generate light toward an optical member used for irradiating the light irradiated by the vehicle headlamp.
[0013]
According to a second aspect of the present invention, there is provided a vehicular headlamp for use in a vehicle, which emits light to a phosphor from a plurality of different directions and a phosphor which emits light in response to light emitted from outside. Accordingly, a light irradiating unit that emits light from the phosphor and an optical member having an optical center near the phosphor are provided.
[0014]
Note that the above summary of the present invention does not list all of the necessary features of the present invention, and a sub-combination of these features may also be an invention.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described through embodiments of the present invention. However, the following embodiments do not limit the invention according to the claims, and all of the combinations of the features described in the embodiments are not limited thereto. It is not always essential to the solution of the invention.
[0016]
FIG. 1 shows an example of a configuration of a vehicle lamp 400 according to an embodiment of the present invention. The vehicle lamp 400 is, for example, a low-beam irradiation vehicle headlight (headlamp) that emits light in a predetermined irradiation direction in front of the vehicle. The purpose of the vehicle lamp 400 of this example is to form an appropriate light distribution pattern by irradiating light controlled with high accuracy. The vehicle lamp 400 accommodates a plurality of light source units 100 in a substantially horizontal line in a lamp room formed by a transparent transparent cover 402 and a lamp body 404.
[0017]
These light source units 100 have the same or similar configuration, and the optical axis is directed downward by about 0.3 to 0.6 ° with respect to the vehicle front-rear direction when the vehicle lamp 400 is attached to the vehicle body. Thus, it is housed in a light room. The vehicular lamp 400 irradiates light in front of the vehicle based on the light emitted by the light source units 100 to form a predetermined light distribution pattern. The vehicular lamp 400 may include a plurality of light source units 100 having different light distribution characteristics.
[0018]
2 and 3 show an example of the configuration of the light source unit 100. FIG. FIG. 2 shows a BB vertical sectional view of the light source unit 100. FIG. 3 shows an AA horizontal sectional view of the light source unit 100. The light source unit 100 of the present example is a projector-type light source unit that irradiates the light condensed and reflected near the optical axis to the front through a lens, and includes a phosphor 204, a light irradiation unit 202, an LED support unit 206, It has a horizontal reflector 118, a projection lens 104, and a reflector 114. The phosphor 204 and the light irradiating unit 202 constitute a light source provided in the light source unit 100.
[0019]
The phosphor 204 is provided at a predetermined position, for example, at the rear end of the horizontal reflection unit 118, and sends light having a different wavelength from the light to the reflector 114 in accordance with the light emitted from the light irradiation unit 202. It occurs toward. In this example, the phosphor 204 is formed of a phosphor that generates red light, green light, and blue light in response to ultraviolet light. The phosphor 204 generates white light by generating red light, green light, and blue light with substantially the same intensity.
[0020]
In another example, the phosphor 204 may be formed of, for example, a YAG phosphor made of yttrium, aluminum, or garnet (YAG). In this case, the phosphor 204 generates yellow light, which is a complementary color of the blue light, in response to the blue light.
[0021]
The light irradiation unit 202 includes a plurality of LED modules 210 and a plurality of condenser lenses 208. In another example, the light irradiation unit 202 may include a pair of the LED module 210 and the condenser lens 208.
[0022]
The LED module 210 includes the semiconductor light emitting element 102 and the sealing member 108. The semiconductor light emitting device 102 is a light emitting diode device provided separately from the phosphor 204. In this example, the semiconductor light emitting element 102 irradiates the phosphor 204 with, for example, ultraviolet light having a wavelength of about 400 nm or less from a predetermined light emitting region. Thereby, the semiconductor light emitting element 102 causes the phosphor 204 to generate white light. The light source unit 100 emits white light generated by the phosphor 204 toward the front of the vehicle. In this case, it is preferable that the light source unit 100 emits white light in a white light region specified by, for example, the automotive headlight standard (JIS D5500).
[0023]
In another example, the semiconductor light emitting element 102 may irradiate the phosphor 204 formed of, for example, a YAG fluorescent substance with blue light having a wavelength of, for example, about 420 to 480 nm. Thereby, the semiconductor light emitting element 102 causes the phosphor 204 to generate yellow light. The light source unit 100 emits white light based on the blue light and the yellow light generated by the semiconductor light emitting element 102 and the phosphor 204, respectively.
[0024]
The sealing member 108 is a resin mold of the LED module 210 and is formed of, for example, a transparent resin, and seals the semiconductor light emitting element 102. Further, the sealing member 108 transmits the light generated by the semiconductor light emitting element 102 toward the condenser lens 208.
[0025]
The plurality of condenser lenses 208 are provided corresponding to the semiconductor light emitting elements 102 included in the plurality of LED modules 210, respectively, and collect the light generated by the corresponding semiconductor light emitting elements 102 onto the phosphor 204, respectively. In this case, each condensing lens 208 irradiates the phosphor 204 from a plurality of different directions by deflecting light generated by the corresponding semiconductor light emitting element 102 in a plurality of directions toward the phosphor 204. I do. Accordingly, the light irradiation unit 202 causes the phosphor 204 to emit light.
[0026]
In another example, the sealing member 108 may have the function of the condenser lens 208. In this case, the sealing member 108 deflects light generated by the semiconductor light emitting element 102 toward the phosphor 204.
[0027]
Here, for example, if the phosphor 204 is formed so as to cover the semiconductor light emitting device 102, the size of the phosphor 204 is substantially larger than the surface of the semiconductor light emitting device 102. However, in this example, the phosphor 204 provided separately from the semiconductor light emitting element 102 receives the ultraviolet light collected by the light collecting lens 208. Therefore, even when the size of the semiconductor light emitting element 102 is, for example, about several mm square or more, according to the present embodiment, regardless of the size of the semiconductor light emitting element 102, the phosphor 204 has a diameter of, for example, 0.5 mm. It can be formed in a small dot shape of the following order. Thus, a light source that generates white light from a small point-like region can be appropriately formed.
[0028]
In this example, the projected area of the phosphor 204 from the phosphor 204 toward the semiconductor light emitting element 102 is smaller than the area of the light emitting region in the semiconductor light emitting element 102. Therefore, the light source unit 100 forms a light distribution pattern based on the light generated by the phosphor 204 provided in the small area. In this case, the light source unit 100 can form an appropriate light distribution pattern with high accuracy. In this case, since the optical design based on the light emission from the small area is performed, the optical design of the light source unit 100 can be easily performed.
[0029]
The LED support unit 206 is provided on the rear side of the vehicle with respect to the phosphor 204, with the condenser lens 208 and the plurality of LED modules 210 interposed therebetween, and supports and fixes the plurality of LED modules 210. Further, the LED support unit 206 may further support and fix the plurality of condenser lenses 208.
[0030]
It is preferable that the LED support unit 206 fixes the light irradiation unit 202 outside the optical path from the phosphor 204 to the reflector 114. In this case, the light generated by the phosphor 204 can be efficiently made incident on the reflector 114.
[0031]
The horizontal reflecting unit 118 is a reflecting mirror that reflects light on a substantially horizontal upper surface, is provided between the light irradiating unit 202 and the projection lens 104, and places the phosphor 204 near the rear end. The front edge of the horizontal reflecting portion 118 has a substantially linear shape extending substantially in the left-right direction of the vehicle. The leading edge may have, for example, a substantially U-shape.
[0032]
The projection lens 104 is provided in front of the vehicle with respect to the horizontal reflection unit 118 and the reflector 114, and transmits light reflected by the horizontal reflection unit 118 or the reflector 114 and irradiates the light in the forward irradiation direction. In the present example, the projection lens 104 has a focal point near the front edge of the horizontal reflector 118, and projects an image of a focal plane including this focal point forward of the vehicle, thereby turning on the vehicle lamp 400 (see FIG. 1). At least a part of the light distribution pattern is formed. In this case, the projection lens 104 forms at least a part of a cut line which is a light-dark boundary in the light distribution pattern, based on the leading edge shape of the horizontal reflection portion 118. The projection lens 104 forms a substantially U-shaped cut line based on, for example, a substantially U-shaped front edge shape.
[0033]
The reflector 114 is an example of an optical member provided to reflect or deflect light generated by the phosphor 204, and is provided so as to surround the rear, side, and upper portions of the phosphor 204. Then, the reflector 114 reflects the light generated by the phosphor 204 forward to make the light enter the projection lens 104 and irradiate the projection lens 104 with the light in the irradiation direction. Thus, the reflector 114 irradiates the light generated by the phosphor 204 in the irradiation direction. As described above, the reflector 114 is used for irradiating the light emitted from the vehicle lamp 400.
[0034]
Here, at least a part of the reflector 114 has a substantially elliptical spherical shape formed by, for example, a composite elliptical surface. The substantially elliptical spherical surface is set so that the cross-sectional shape including the optical axis of the light source unit 100 is at least a part of the substantially elliptical shape. The eccentricity of the substantially elliptical shape is set so as to gradually increase from the vertical section to the horizontal section. Note that the light source unit 100 has an optical axis that passes through substantially the center of the projection lens 104 and goes substantially forward of the vehicle.
[0035]
The reflector 114 has an optical center near the phosphor 204, for example, a focal point or a reference point in optical design. In this example, the substantially elliptical spherical portion of the reflector 114 has a focal point F1 near the phosphor 204 and a focal point F2 near the front end of the horizontal reflecting section 118. In this case, the substantially elliptical spherical portion condenses at least most of the light generated by the phosphor 204 near the front edge of the horizontal reflecting portion 118.
[0036]
In this case, a clear light-dark boundary based on the shape of the leading edge is formed near the leading edge. Therefore, the projection lens 104 having a focus near the leading edge has a clear bright-dark border near the cut line of the light distribution pattern. Irradiate light having a boundary. Therefore, according to this example, it is possible to appropriately form a light distribution pattern having a clear cut line.
[0037]
In another example, the reflector 114 may be a parabolic reflector having a focal point near the phosphor 204. In this case, the light source unit 100 may be a parabolic light source unit that irradiates light forward using a parabolic (parabolic) reflector, and instead of the projection lens 104, for example, a transparent transparent cover Having. Also in this case, the light source unit 100 irradiates the light controlled with high precision forward.
[0038]
FIG. 4 is a conceptual diagram showing an example of a light distribution pattern 502 formed by the light source unit 100. The light distribution pattern 502 is a low-beam light distribution pattern formed on a virtual vertical screen disposed at a position 25 m in front of the light source unit 100.
[0039]
In this example, the projection lens 104 forms a light distribution pattern 502 having a light-dark boundary defined by a horizontal cut line 504 and an oblique cut line 506 by projecting light generated by the phosphor 204 onto a virtual vertical screen. . The projection lens 104 forms a horizontal cut line 504 and an oblique cut line 506 based on the front edge shape of the horizontal reflection section 118 (see FIG. 2).
[0040]
Here, as described with reference to FIGS. 2 and 3, the reflector 114 condenses the light generated by the phosphor 204 provided in a small area in the vicinity of the front edge of the horizontal reflection unit 118 with high accuracy. . Therefore, the projection lens 104 clearly projects the horizontal cut line 504 and the oblique cut line 506 on the virtual vertical screen. According to this example, the light distribution pattern 502 can be formed appropriately and with high accuracy.
[0041]
In another example, the vehicular lamp 400 (see FIG. 1) may form the light distribution pattern 502 based on light generated by a plurality of light source units 100 having different light distribution characteristics. In this case, each light source unit 100 may irradiate a partial area in the light distribution pattern 502.
[0042]
5 and 6 show another example of the configuration of the light source unit 100. FIG. FIG. 5 is a BB horizontal sectional view of the light source unit 100. FIG. 6 shows an AA vertical sectional view of the light source unit 100. The light source unit 100 of the present example is a projector-type light source unit that irradiates light generated by the light source to the front by a projection lens 104, and includes a phosphor 204, a light irradiation unit 202, a support member 110, a light blocking member 112, and a It has a lens 104.
[0043]
The phosphor 204 and the light irradiating unit 202 have the same or similar functions as the phosphor 204 and the light irradiating unit 202 described with reference to FIGS. 2 and 3, and constitute a light source in the light source unit 100. The phosphor 204 is fixed to the surface of the support member 110 toward the projection lens 104, and generates light having a different wavelength from the light toward the projection lens 104 in accordance with the light generated by the light irradiation unit 202. .
[0044]
The light irradiation unit 202 has a plurality of LED modules 210 each including the semiconductor light emitting element 102 and the sealing member 108. In this example, the sealing member 108 has the same or similar function as the condenser lens 208 described with reference to FIG. 1, and deflects the light generated by the semiconductor light emitting element 102 toward the phosphor 204. In another example, the light irradiation unit 202 may further include a plurality of sealing members 108 provided corresponding to the plurality of LED modules 210.
[0045]
In this example, the plurality of LED modules 210 are fixed to the rear surface of the light blocking member 112 and irradiate light toward the phosphor 204 provided further behind the vehicle. In this case, since the light irradiation unit 202 is fixed outside the optical path from the phosphor 204 to the projection lens 104, the light generated by the phosphor 204 can be efficiently incident on the projection lens 104.
[0046]
The support member 110 is a plate-like body that supports and fixes the phosphor 204 on a surface facing the front of the vehicle. The light blocking member 112 is a plate-shaped member provided in the vicinity of the phosphor 204 so as to substantially face the surface of the support member 110 with the phosphor 204 interposed therebetween. , The light / dark boundary of light incident on the projection lens 104 is defined based on the projection shape of the upper edge in the front direction. The projected shape is, for example, a linear shape extending substantially in the left-right direction of the vehicle. The projection shape may be a substantially U-shape.
[0047]
The projection lens 104 is an example of an optical member provided to reflect or deflect the light generated by the phosphor 204, and transmits the light generated by the phosphor 204 to irradiate the light in front of the vehicle. Irradiate in the direction.
[0048]
In this example, the projection lens 104 has an optical center near the phosphor 204. In this case, the projection lens 104 can irradiate the controlled light with high precision forward based on the light generated by the phosphor 204 provided in the small area. The projection lens 104 may have, for example, an optical center near the upper edge of the light blocking member 112 as an example of the vicinity of the phosphor 204.
[0049]
The light source unit 100 forms at least a part of the light distribution pattern of the vehicle lamp 400 (see FIG. 1) based on the light emitted by the projection lens 104. Therefore, according to this example, an appropriate light distribution pattern can be formed with high accuracy. Except for the above points, in FIGS. 5 and 6, the components denoted by the same reference numerals as those in FIGS. 2 and 3 have the same or similar functions as the configurations in FIGS.
[0050]
FIG. 7 illustrates another example of the configuration of the light irradiation unit 202. The light irradiating section 202 of this example has a plurality of semiconductor laser modules 120 each including the semiconductor light emitting element 102, instead of the LED module 210. In this example, the semiconductor light emitting device 102 is a semiconductor laser device that generates laser light such as ultraviolet light or blue light.
[0051]
In this case, the plurality of semiconductor laser modules 120 irradiate the phosphor 204 with laser light from different directions. Therefore, according to this example, it is possible to irradiate the phosphor 204 with a large amount of light. Further, this allows the phosphor 204 provided in a small area to emit light with high luminance.
[0052]
Except for the above points, in FIG. 7, the components denoted by the same reference numerals as those in FIGS. 2 and 3 or FIGS. 5 and 6 have the same or similar functions as the configurations in these drawings, and therefore description thereof will be omitted. I do. The light irradiation unit 202 and the phosphor 204 may be used in the light source unit 100 described with reference to FIGS. 2 and 3 or FIGS. Also in these cases, the light source unit 100 can form an appropriate light distribution pattern.
[0053]
The light irradiation unit 202 may further include a plurality of condenser lenses provided corresponding to the plurality of semiconductor laser modules 120. These condensing lenses converge laser light generated by the corresponding semiconductor laser module 120 onto the phosphor 204, respectively. In this case, the laser beams generated by the plurality of semiconductor laser modules 120 can be focused on a smaller area.
[0054]
FIG. 8 shows still another example of the configuration of the light irradiation unit 202. The light irradiating section 202 of the present example includes a semiconductor light emitting element 302 which is, for example, a light emitting diode element. The semiconductor light emitting device 302 includes an active layer 304 and a groove 306. The active layer 304 is a layer including a PN junction formed in the semiconductor light emitting element 302, and according to the power supplied to the semiconductor light emitting element 302, the active layer 304 has characteristics of the PN junction such as ultraviolet light and blue light. Generates light of a defined wavelength.
[0055]
The groove 306 is formed to have a substantially linear opening in the surface of the semiconductor light emitting element 302, and the depth reaches at least a part of the active layer 304. In this case, the semiconductor light emitting element 302 irradiates the light generated in the active layer 304 to the outside from the groove 306.
[0056]
The phosphor 204 is provided near the center of the groove 306 on the surface of the semiconductor light emitting element 302. In this case, the semiconductor light emitting element 302 irradiates the phosphor 204 formed in a region smaller than the opening of the groove 306 from substantially the entire groove 306 extending below the phosphor 204. Therefore, also in this example, the light irradiation unit 202 irradiates the phosphor 204 with light from a plurality of different directions. The phosphor 204 generates white light, yellow light, and the like according to the light emitted from the groove 306.
[0057]
Except for the above points, in FIG. 8, the components denoted by the same reference numerals as those in FIGS. 2 and 3 or FIGS. 5 and 6 have the same or similar functions as the configurations in these drawings, and therefore the description thereof will be omitted. I do. The light irradiation unit 202 and the phosphor 204 may be used in the light source unit 100 described with reference to FIGS. 2 and 3 or FIGS. Also in these cases, the light source unit 100 can form an appropriate light distribution pattern. The light irradiating section 202 and the phosphor 204 may be provided near the position where the phosphor 204 is provided in FIGS. 2 and 3 or FIGS. 5 and 6.
[0058]
As described above, the present invention has been described using the embodiments, but the technical scope of the present invention is not limited to the scope described in the above embodiments. Various changes or improvements can be added to the above embodiment. It is apparent from the description of the appended claims that embodiments with such changes or improvements can be included in the technical scope of the present invention.
[0059]
As is clear from the above description, according to the present invention, a light distribution pattern can be appropriately formed.
[Brief description of the drawings]
FIG. 1 is a diagram showing an example of a configuration of a vehicle lamp 400 according to an embodiment of the present invention.
FIG. 2 is a diagram showing a BB vertical sectional view of the light source unit 100.
FIG. 3 is a diagram illustrating an AA horizontal cross-sectional view of the light source unit 100.
FIG. 4 is a conceptual diagram illustrating an example of a light distribution pattern 502.
FIG. 5 is a view showing a BB horizontal sectional view of the light source unit 100.
FIG. 6 is a diagram showing an AA vertical sectional view of the light source unit 100.
FIG. 7 is a diagram illustrating another example of the configuration of the light irradiation unit 202.
FIG. 8 is a diagram showing still another example of the configuration of the light irradiation unit 202.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 100 ... vehicle lamp, 102 ... semiconductor light emitting element, 104 ... projection lens, 108 ... seal member, 110 ... support member, 112 ... light shielding member, 114 ... reflector , 118 ... horizontal reflection part, 120 ... semiconductor laser module, 202 ... light irradiation part, 204 ... phosphor, 206 ... LED support part, 208 ... condensing lens, 210 ... ..LED module, 302 semiconductor light emitting element, 304 active layer, 306 groove, 400 lamp for vehicle, 402 transparent cover, 404 lamp body, 502 ..Light distribution pattern, 504 horizontal cut line, 506 diagonal cut line

Claims (9)

光を発生する光源であって、
外部から照射される光に応じて発光する蛍光体と、
異なる複数の方向から前記蛍光体に光を照射することにより、前記蛍光体を発光させる光照射部と
を備えることを特徴とする光源。
A light source that generates light,
A phosphor that emits light in response to light emitted from the outside,
A light irradiating unit that emits light to the phosphor by irradiating the phosphor with light from a plurality of different directions.
前記光照射部は、予め定められた発光領域から前記蛍光体に対して光を発生する半導体発光素子を有し、
前記蛍光体から前記半導体発光素子に向かう方向への、前記蛍光体の投影面積は、前記発光領域の面積より小さいことを特徴とする請求項1に記載の光源。
The light irradiation unit has a semiconductor light emitting element that emits light to the phosphor from a predetermined light emitting region,
The light source according to claim 1, wherein a projection area of the phosphor in a direction from the phosphor toward the semiconductor light emitting element is smaller than an area of the light emitting region.
前記光照射部は、
前記蛍光体から離間して設けられた半導体発光素子と、
前記半導体発光素子が発生する光を、前記蛍光体に集光する集光レンズと
を有することを特徴とする請求項1に記載の光源。
The light irradiation unit,
A semiconductor light emitting device provided apart from the phosphor,
The light source according to claim 1, further comprising: a condenser lens that condenses the light generated by the semiconductor light emitting element on the phosphor.
前記光照射部は、
複数の前記半導体発光素子と、
前記複数の半導体発光素子に対応してそれぞれ設けられ、対応する前記半導体発光素子が発生する光を、前記蛍光体にそれぞれ集光する複数の前記集光レンズと
を有することを特徴とする請求項3に記載の光源。
The light irradiation unit,
A plurality of the semiconductor light emitting elements,
The light-emitting device according to claim 1, further comprising: a plurality of condensing lenses provided corresponding to the plurality of semiconductor light-emitting elements, and condensing light generated by the corresponding semiconductor light-emitting elements onto the phosphor. 3. The light source according to 3.
前記蛍光体は、前記蛍光体が発生する光を反射又は偏向するために設けられた光学部材に向かって光を発生し、
前記光照射部は、前記蛍光体から前記光学部材へ至る光路の外側に設けられたことを特徴とする請求項1に記載の光源。
The phosphor emits light toward an optical member provided to reflect or deflect light generated by the phosphor,
The light source according to claim 1, wherein the light irradiation unit is provided outside an optical path from the phosphor to the optical member.
前記光照射部は、前記蛍光体に向けて、それぞれ異なる方向から光を照射する複数の半導体レーザを有することを特徴とする請求項1に記載の光源。The light source according to claim 1, wherein the light irradiation unit includes a plurality of semiconductor lasers that emit light toward the phosphor from different directions. 前記光照射部は、少なくとも活性層の一部まで達する深さの溝が形成された半導体発光素子を有し、
前記蛍光体は、前記溝の中央近傍に設けられたことを特徴とする請求項1に記載の光源。
The light irradiation section has a semiconductor light emitting element in which a groove having a depth reaching at least a part of the active layer is formed,
The light source according to claim 1, wherein the phosphor is provided near a center of the groove.
前記蛍光体は、前記蛍光体の近傍に光学的中心を有し、かつ、車両用前照灯が照射する光を照射するために用いられる光学部材に向かって光を発生することを特徴とする請求項1に記載の光源。The phosphor has an optical center in the vicinity of the phosphor, and emits light toward an optical member used to irradiate light emitted by a vehicle headlamp. The light source according to claim 1. 車両に用いられる車両用前照灯であって、
外部から照射される光に応じて発光する蛍光体と、
異なる複数の方向から前記蛍光体に光を照射することにより、前記蛍光体を発光させる光照射部と、
前記蛍光体の近傍に光学的中心を有する光学部材と
を備えることを特徴とする車両用前照灯。
A vehicle headlight used in a vehicle,
A phosphor that emits light in response to light emitted from the outside,
By irradiating the phosphor with light from a plurality of different directions, a light irradiation unit that emits the phosphor,
An optical member having an optical center near the phosphor.
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