JP6964611B2 - 熱伝導性の蛍光取り出しドームを備えたレーザベース光源 - Google Patents
熱伝導性の蛍光取り出しドームを備えたレーザベース光源 Download PDFInfo
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Description
レーザピーク発光波長でレーザ光を発するよう構成されるレーザと、
前記レーザ光の一部を変換光に変換するよう構成され、該変換光のピーク発光波長が、前記レーザピーク発光波長よりも長い波長範囲にある、セラミック光コンバータと、
25W/(m・K)よりも大きい熱伝導率を持った物質を含む少なくとも2.5×105μm2のベース領域を有する光取り出しドームであり、少なくとも8×103μm2の前記光取り出しドームの前記ベース領域の接合領域が、前記セラミック光コンバータへ接着剤なしで接合され、前記ベース領域が、前記レーザによって照らされるよう構成される前記セラミック光コンバータの面積よりも少なくとも25倍大きい、前記光取り出しドームと、
前記光取り出しドームへ熱的に結合される基板と
を有する。
・基板131におけるホール開口Rcを広げることは、熱抵抗をわずかに上昇させる;
・基板131と光取り出しドーム136との間のインターフェイスは、線64と線66との間に本質的に差がないので、重要でない;
・熱抵抗は、1/rに近似的に比例する。
11 反射レーザ光
12 透過レーザ光
20 変換光
51 吸収
52 波長
53 スペクトル透過率
55 YAG:Ce蛍光体の吸収係数
56 部分反射構造体の透過率
61 熱抵抗(K/W)
62 蛍光体半径Ri(μm)
64 Rc=Ri及び10μm接着剤についての熱抵抗
65 Rc=Ri+100μmについての熱抵抗
66 Rc=Ri及び1μm接着剤についての熱抵抗
67 1/r依存関係
74 50μmの蛍光体厚さでの熱抵抗
75 25μmの蛍光体厚さでの熱抵抗
76 1μmの接着剤層の熱抵抗
91 455nmの動作波長
92 物質吸収(任意単位)
93 サンプル変換
94 青色部分(部分反射構造体なし)
95 全出力(部分反射構造体なし)
96 全出力(部分反射構造体あり)
97 青色部分(部分反射構造体あり)
100 レーザベース光源
110 レーザ
115 光学デバイス
120 光導波路
131 基板
132 側面コーティング
133 光偏向層
134 セラミック光コンバータ
135 接合層
136 光取り出しドーム
136a 光軸
137 反射構造体
138 部分反射構造体
139 窓
140 シールド
α ドーム開口角度
Ri 蛍光体半径
Rc 基板開口の半径
Ro ドームの半径
Claims (12)
- レーザピーク発光波長でレーザ光を発するよう構成されるレーザと、
前記レーザ光の一部を変換光に変換するよう構成され、該変換光のピーク発光波長が、前記レーザピーク発光波長よりも長い波長範囲にある、セラミック光コンバータと、
25W/(m・K)よりも大きい熱伝導率を持った物質を含む少なくとも2.5×105μm2のベース領域を有する光取り出しドームであり、少なくとも8×103μm2の前記光取り出しドームの前記ベース領域の接合領域が、前記セラミック光コンバータへ接着剤なしで接合され、前記ベース領域が、前記レーザによって照らされるよう構成される前記セラミック光コンバータの面積よりも少なくとも25倍大きい、前記光取り出しドームと、
前記光取り出しドームへ熱的に結合される基板と
を有し、
前記光取り出しドームは、前記ベース領域の中心点を通って且つ前記光取り出しドームの頂点を通って延在する光軸を有し、
前記セラミック光コンバータの中心は、前記光取り出しドームの前記光軸上に又はその近くに配置され、
前記光取り出しドームは、前記ベース領域の周りの前記光取り出しドームの周縁を覆う反射構造体を有し、
前記反射構造体は、前記光取り出しドームの前記光軸に対してα=65°よりも大きい角度で前記光取り出しドーム内に発せられた前記変換光が前記セラミック光コンバータの方向に反射され返すように配置される、
レーザベース光源。 - 前記光取り出しドームは、サファイアの半球を有し、
前記セラミック光コンバータは、前記光取り出しドームへ熱接合され、
前記レーザは、前記変換光の少なくとも50%が前記光取り出しドームを介して発せられるように、青色レーザピーク発光波長を持ったレーザ光を前記基板の開口を通って前記セラミック光コンバータへ発するよう構成される、
請求項1に記載のレーザベース光源。 - 前記セラミック光コンバータは、黄色蛍光体ガーネットを有し、
当該レーザベース光源は、前記変換光の少なくとも一部と、前記セラミック光コンバータを通って伝えられる透過レーザ光の少なくとも一部とを有する白色光を発するよう構成される、
請求項2に記載のレーザベース光源。 - 当該レーザベース光源は、前記セラミック光コンバータの側面に付着された側面コーティングを有し、
前記セラミック光コンバータの前記側面は、前記接合領域に対して傾斜する、
請求項1又は2に記載のレーザベース光源。 - 前記レーザから発せられた前記レーザ光の一部は、前記セラミック光コンバータを透過して透過レーザ光となり、
前記レーザ光の発光コーンは、前記光取り出しドームを介して発せられた前記変換光及び前記透過レーザ光が前記光軸の周りの角度α内で重なり合うように、前記反射構造体によって画定された前記角度αに適応される、
請求項1又は2に記載のレーザベース光源。 - 当該レーザベース光源は、前記レーザからの前記レーザ光を前記セラミック光コンバータへ導くよう構成される光導波路を有し、該光導波路は、前記透過レーザ光の発光コーンを画定するよう適応される開口数を有する、
請求項5に記載のレーザベース光源。 - 当該レーザベース光源は、前記セラミック光コンバータへ結合された光偏向層を有し、該光偏向層は、前記透過レーザ光の発光コーンを画定するよう構成される、
請求項5に記載のレーザベース光源。 - 当該レーザベース光源は、前記光取り出しドームへ結合された部分反射構造体を有し、該部分反射構造体の光透過率は、前記変換光の一部及び前記レーザ光の一部を有する混合光のカラーポイントが安定化されるように、前記レーザピーク発光波長に所定の波長範囲内で従属する、
請求項1又は2に記載のレーザベース光源。 - 前記光取り出しドームは、サファイアの半球を有し、
前記セラミック光コンバータは、前記光取り出しドームへ熱接合された黄色蛍光体ガーネットを有し、
前記レーザは、青色レーザピーク発光波長を持ったレーザ光を前記光取り出しドームを通って前記セラミック光コンバータへ発するよう構成され、
当該レーザベース光源は、前記変換光の少なくとも一部及び前記レーザ光の少なくとも一部を有する白色光を発するよう構成される、
請求項1に記載のレーザベース光源。 - 前記セラミック光コンバータは、接合層によって前記基板へ直接に接合される、
請求項9に記載のレーザベース光源。 - 前記セラミック光コンバータが前記光取り出しドームから取り除かれる場合に前記レーザ光が遮られるようにシールドが前記光取り出しドームに取り付けられる、
請求項1又は2に記載のレーザベース光源。 - 請求項1乃至11のうちいずれか一項に記載のレーザベース光源を少なくとも1つ有する車両ヘッドライト。
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PCT/EP2017/065198 WO2018001813A1 (en) | 2016-06-28 | 2017-06-21 | Laser-based light source with heat conducting outcoupling dome |
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CN110319375B (zh) * | 2018-03-30 | 2022-02-15 | 松下知识产权经营株式会社 | 照明装置 |
WO2019202082A1 (en) * | 2018-04-19 | 2019-10-24 | Lumileds Holding B.V. | Laser lighting module with safety function |
US10788190B2 (en) * | 2018-11-28 | 2020-09-29 | Sharp Kabushiki Kaisha | Light source unit |
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