JP2015153646A - 車両用灯具 - Google Patents
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Abstract
Description
図3は、1軸非共振・1軸共振タイプの光偏光器201の斜視図である。
この式に基づけば、例えば、水平走査周波数fH=25kHz、垂直走査周波数fV=70Hz、垂直走査の利用時間係数KV=0.9〜0.8の場合、垂直走査線数は、2×25kHz/70Hz*0.9〜0.85=約600本となる。
本願の発明者らは、走行中の車両用前照灯(ヘッドランプ)をイメージした試験システムを用いて実験を行い、被験者の感じるちらつき度合いを評価した。
軸が印加電圧の周波数(例えば正弦波又は三角波)を表している。
この式に基づけば、例えば、画素数300×600、fV=70、Br=0.5の場合、変調周波数fLは、300×600×70/0.5=約25MHzとなる。変調周波数fLが25MHzの場合、1/25MHz秒ごとに、励起光源12の出力をオン/オフ又は発光強度を複数段階(例えば0を最小として複数段階)に制御することができる。
の信頼性、耐久性、寿命等を向上させることができる。
図15は、2軸非共振タイプの光偏光器161の斜視図である。
図17は、2軸共振タイプの光偏光器201Aの平面図である。
tan(βv_max)≧S/d ・・・(式2)
但し、Lは波長変換部材18の水平方向長さの1/2、Sは波長変換部材18の垂直方向長さの1/2である。
Claims (15)
- 非照射領域が形成される複数の照射パターンが重畳された所定配光パターンを形成するように構成された車両用灯具において、
前記複数の照射パターンは、それぞれの前記非照射領域が重なり共通の非照射領域を形成するように重畳されており、
前記複数の照射パターンそれぞれに形成される前記非照射領域は、サイズが相互に異なる車両用灯具。 - 車両前方の照射禁止対象を検出する照射禁止対象検出手段を備え、
前記非照射領域は、前記複数の照射パターンそれぞれの、前記照射禁止対象検出手段により検出された照射禁止対象に対応する領域に形成される請求項1に記載の車両用灯具。 - 前記複数の照射パターンは、サイズが相互に異なり、サイズが小さいほど光度が高い請求項1又は2に記載の車両用灯具。
- 前記複数の照射パターンそれぞれに形成される前記非照射領域は、当該非照射領域が形成される照射パターンのサイズが小さいほどサイズが小さい請求項3に記載の車両用灯具。
- 前記複数の照射パターンそれぞれの前記非照射領域は、相似形状である請求項1から4のいずれか1項に記載の車両用灯具。
- 車両前部の左側に配置され、前記複数の照射パターンのうち少なくとも1つの照射パターンを形成する第1灯具ユニットと、
車両前部の右側に配置され、前記複数の照射パターンのうち少なくとも1つの照射パターンを形成する第2灯具ユニットと、を備えた請求項1から5のいずれか1項に記載の車両用灯具。 - 複数の励起光源と、
前記複数の励起光源に対応して設けられた複数の光偏光器であって、前記複数の励起光源のうち対応する励起光源から入射する励起光を水平方向及び垂直方向に二次元的に走査するミラー部を含む複数の光偏光器と、
前記複数の光偏光器に対応して設けられた複数の走査領域を含む波長変換部材であって、前記複数の光偏光器それぞれの前記ミラー部によって水平方向及び垂直方向に二次元的に走査される励起光により、前記複数の走査領域のうち対応する走査領域に二次元像が描画されることで、前記複数の走査領域それぞれに前記複数の照射パターンそれぞれに対応する光度分布が形成される波長変換部材と、
前記複数の走査領域それぞれに形成される光度分布を投影して、前記所定配光パターンを形成する光学系と、を備えた請求項1から5のいずれか1項に記載の車両用灯具。 - 前記複数の励起光源は、励起光を放出する半導体発光素子又は励起光を出射する光ファイバの出射端面である請求項7に記載の車両用灯具。
- 前記複数の照射パターンは、第1非照射領域が形成される第1照射パターン、第2非照射領域が形成される第2照射パターン及び第3非照射領域が形成される第3照射パターンを含み、
前記第1照射パターン、前記第2照射パターン及び前記第3照射パターンは、前記第1非照射領域、前記第2非照射領域及び前記第3非照射領域が重なり共通の非照射領域を形成するように重畳されており、
前記複数の光偏光器は、第1光偏光器、第2光偏光器、第3光偏光器を含み、
前記複数の走査領域は、第1走査領域、前記第1走査領域より小サイズでかつ前記第1走査領域と重なった第2走査領域、前記第2走査領域より小サイズでかつ前記第2走査領域と重なった第3走査領域を含み、
前記第1光偏光器は、当該第1光偏光器の前記ミラー部によって水平方向及び垂直方向に二次元的に走査される励起光により、前記第1走査領域に第1二次元像を描画することで、当該第1走査領域に前記第1照射パターンに対応する第1光度分布を形成し、
前記第2光偏光器は、当該第2光偏光器の前記ミラー部によって水平方向及び垂直方向に二次元的に走査される励起光により、前記第2走査領域に前記第1二次元像の一部に重なった状態で第2二次元像を描画することで、当該第2走査領域に前記第1光度分布より光度が高い、前記第2照射パターンに対応する第2光度分布を形成し、
前記第3光偏光器は、当該第3光偏光器の前記ミラー部によって水平方向及び垂直方向に二次元的に走査される励起光により、前記第3走査領域に前記第1二次元像の一部及び前記第2二次元像の一部に重なった状態で第3二次元像を描画することで、当該第3走査領域に前記第2光度分布より光度が高い、前記第3照射パターンに対応する第3光度分布を形成する請求項7又は8に記載の車両用灯具。 - 前記光学系、前記波長変換部材、前記複数の光偏光器は、この順に基準軸に沿って配置されており、
前記複数の励起光源は、それぞれの励起光が後方、かつ、前記基準軸寄りに向かうように傾斜した姿勢で、前記基準軸を取り囲むように配置されており、
前記複数の光偏光器は、それぞれ、前記複数の励起光源のうち対応する励起光源からの励起光が各々の前記ミラー部に入射し、かつ、各々の前記ミラー部からの反射光としての励起光が前記複数の走査領域のうち対応する走査領域に向かうように、前記複数の励起光源より前記基準軸寄り、かつ、当該基準軸を取り囲むように配置されている請求項7から9のいずれか1項に記載の車両用灯具。 - 前記複数の励起光源に対応して設けられた複数の反射面をさらに備えており、
前記光学系、前記波長変換部材、前記複数の光偏光器は、この順に基準軸に沿って配置されており、
前記複数の励起光源は、それぞれの励起光が前方、かつ、前記基準軸寄りに向かうように傾斜した姿勢で、前記基準軸を取り囲むように配置されており、
前記複数の反射面は、それぞれ、前記複数の励起光源のうち対応する励起光源からの励起光が入射し、かつ、各々の反射面からの反射光としての励起光が後方、かつ、前記基準軸寄りに向かうように傾斜した姿勢で、前記複数の励起光源より前記基準軸寄り、かつ、当該基準軸を取り囲むように配置されており、
前記複数の光偏光器は、それぞれ、前記複数の反射面のうち対応する反射面からの反射光としての励起光が各々の前記ミラー部に入射し、かつ、各々の前記ミラー部からの反射光としての励起光が前記複数の走査領域のうち対応する走査領域に向かうように、前記複数の反射面より前記基準軸寄り、かつ、当該基準軸を取り囲むように配置されている請求項7から9のいずれか1項に記載の車両用灯具。 - 前記光学系は、投影レンズであり、
前記投影レンズは、像面が平面になるように収差が補正された複数枚のレンズからなる投影レンズとして構成されており、
前記波長変換部材は、平板形状に構成されており、前記像面に沿って配置されている請求項7から11のいずれか1項に記載の車両用灯具。 - 前記複数の光偏光器はそれぞれ、前記ミラー部と、前記ミラー部を囲むように配置され、第1軸を中心に往復揺動できるように前記ミラー部を支持する可動枠と、前記可動枠を囲むように配置され、前記第1軸と直交する第2軸を中心に往復揺動できるように前記可動枠を支持する台座と、共振駆動により、前記ミラー部を前記可動枠に対して前記第1軸を中心に往復揺動させる第1圧電アクチュエータと、非共振駆動により、前記可動枠及び当該可動枠に支持された前記ミラー部を前記台座に対して前記第2軸を中心に往復揺動させる第2圧電アクチュエータと、を備える1軸非共振・1軸共振タイプの光偏光器として構成されており、
前記複数の光偏光器はそれぞれ、前記第1軸が鉛直面に含まれ、前記第2軸が水平面に含まれた状態で配置されている請求項7から12のいずれか1項に記載の車両用灯具。 - 前記複数の光偏光器それぞれと前記波長変換部材との間の距離は同一である請求項7から13のいずれか1項に記載の車両用灯具。
- 前記複数の光偏光器それぞれと前記波長変換部材との間の距離は相互に異なる請求項7から13のいずれか1項に記載の車両用灯具。
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