ON-VEHICLE LIGHT SOURCE UNIT AND VEHICULAR LIGHTING FIXTURE EQUIPPED WITH THE SAME

• Main Author: MAENO YUSO
• Format: Patent
• Language: English; Japanese
• Published: 29.07.2021
• Subjects: ADHESIVES; BASIC ELECTRIC ELEMENTS; BLASTING; CHEMISTRY; DYES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; HEATING; LIGHTING; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; MECHANICAL ENGINEERING; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-PORTABLE LIGHTING DEVICES; PAINTS; POLISHES; SEMICONDUCTOR 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 on-vehicle light source unit capable of reproducing a luminous color of bluish green stably from immediately after lighting to after an increase in temperature, and a vehicular lighting fixture equipped with the same.SOLUTION: An on-vehicle light source unit 1 includes a first light source 10, a second light source 20, and a third light source 30. The first light source 10 includes a first semiconductor light-emitting element for emitting bluish green light and a wavelength conversion material including a green phosphor. The chromaticity of the second light source 20 is in a range surrounded by a point A (0.20, 0.32), a point B, a point C (0.012, 0.495), and a point D (0.20, 0.40) in a CIE chromaticity diagram. The point B is an intersection point between a half line connecting chromaticity coordinates of the first light source 10 and the point A, and extending on the point A side, and an outer peripheral line of the CIE chromaticity diagram. In the green phosphor, an emission intensity F25 of a peak wavelength at 25°C, and an emission intensity F150 of a peak wavelength at 150°C satisfy the following formula (1).SELECTED DRAWING: Figure 1 【課題】点灯直後から温度上昇後にかけて、安定して青緑色の発光色を再現可能な車載用光源およびそれを備えた車両用灯具を提供する。【解決手段】車載用光源ユニット１は、第１光源１０と、第２光源２０と、第３光源３０と、を備える。第１光源１０は、青色光を出射する第１半導体発光素子と、緑色蛍光体を含む波長変換材と、を有する。第２光源２０の色度は、ＣＩＥ色度図におけるＡ点（０．２０、０．３２）、Ｂ点、Ｃ点（０．０１２、０．４９５）、及びＤ点（０．２０、０．４０）で囲まれる領域内にある。Ｂ点は、第１光源１０の色度座標およびＡ点を結びＡ点側に延長した半直線と、ＣＩＥ色度図の外周線との交点である。緑色蛍光体は、２５℃のピーク波長の発光強度Ｆ25と、１５０℃のピーク波長の発光強度をＦ150とが下記式（１）を満たす。【選択図】図１