LUMINAIRE

• Main Authors: UENO MISAKI, ONO TETSUYA, FUJITA MASAHIRO, BETSUDA NOBUHIKO
• Format: Patent
• Language: English; Japanese
• Published: 28.09.2017
• Subjects: BASIC ELECTRIC ELEMENTS; BLASTING; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-PORTABLE LIGHTING DEVICES; SEMICONDUCTOR DEVICES; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

PROBLEM TO BE SOLVED: To provide a luminaire capable of achieving improvement of optical characteristics even in the case where the temperature of a light emitting part becomes high.SOLUTION: A luminaire includes: a housing for performing heat radiation by natural air cooling; a substrate provided at the housing; a light emitting diode which is provided at the substrate and whose temperature becomes equal to or higher than 150°C during lighting time; and a phosphor layer provided on the light radiation side of the light emitting diode and including nitride phosphor. When a light diminishing ratio when the temperature of the nitride phosphor is at 100°C is defined as A, and a light diminishing ratio when the temperature of the nitride phosphor is at 300°C is defined as B, B/A becomes equal to or greater than 0.9.SELECTED DRAWING: Figure 1 【課題】発光部の温度が高くなった場合であっても、光学特性の向上を図ることができる照明装置を提供することである。【解決手段】実施形態に係る照明装置は、自然空冷による放熱を行う筐体と；前記筐体に設けられた基板と；前記基板に設けられ、点灯時に１５０℃以上の温度になる発光ダイオードと；前記発光ダイオードの光の放射側に設けられた窒化物蛍光体を含む蛍光体層と；を具備している。前記窒化物蛍光体の温度が１００℃の時の減光率をＡ、前記窒化物蛍光体の温度が３００℃の時の減光率をＢとした場合に、Ｂ／Ａが０．９以上となる。【選択図】図１