ILLUMINATION DEVICE AND LIGHT-EMITTING UNIT

• Main Authors: MIYASAKA NAOHIDE, MIYAZAWA MASAAKI, GOMI KEIICHI, MOMOSE YOSHINORI
• Format: Patent
• Language: English; Japanese
• Published: 04.06.2020
• Subjects: BLASTING; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; HEATING; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATINGELEMENTS; LIGHTING; MECHANICAL ENGINEERING; NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; NON-PORTABLE LIGHTING DEVICES; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

To provide an illumination device which has a simple structure having a laser diode (LD) as a light source and high efficiency for light utilization.SOLUTION: An illumination device has a semiconductor light source, an optical system which includes a first optical element that collimates into parallel light a component of either a radiation angle horizontal direction or a radiation angle vertical direction of a first light flux outputted by the semiconductor light source, and a light-emitting unit including a wavelength conversion surface irradiated by a second light flux outputted by the optical system and outputs light wavelength converted. The wavelength conversion surface extends along a first contour shape along a fist surface including another direction, and the first contour shape satisfies the following condition (1) in XY coordinates with an optical axis as an X axis: (x2-x1)+(y2-y1)=(α.g(θ+dθ/2))...(1) g(θ)=exp(-θ/(2×σ)), where θ is an angle from the X axis, α is proportional constant, and σis value indicating dispersion of a component in another direction of the second light flux.SELECTED DRAWING: Figure 2 【課題】レーザーダイオード（ＬＤ）を光源とした構造が簡単で、光利用効率の高い照明装置を提供する。【解決手段】半導体光源と、半導体光源から出力される第１の光束の放射角水平方向または放射角垂直方向のいずれか一方の成分を平行光にコリメートする第１の光学素子を含む光学系と、光学系から出力される第２の光束により照射され、波長変換された光を出力する波長変換面を含む発光ユニットとを有する照明装置を提供する。波長変換面は、他方の方向を含む第１の面に沿った第１の輪郭形状に沿って延び、前記第１の輪郭形状は、光軸をＸ軸とするＸＹ座標において以下の条件（１）を満足する。（ｘ２−ｘ１）２＋（ｙ２−ｙ１）２＝（α・ｇ（θ＋ｄθ／２））２・・・（１）ｇ（θ）＝ｅｘｐ（−θ２／（２×σ２））ただし、θはＸ軸からの角度、αは比例定数、σ２は第２の光束の他方の方向の成分の分散を示す値である。【選択図】図２