ILLUMINATION DEVICE

• Main Authors: FUKUDA HISASHI, YAMAUCHI SATORU, WATANABE KATSUMI, SEKII HIROYUKI, DOI SACHIKO
• Format: Patent
• Language: English; Japanese
• Published: 23.10.2014
• Subjects: BLASTING; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

PROBLEM TO BE SOLVED: To reduce occurrence of luminance unevenness and color unevenness of irradiation light and to prevent denaturation of pigment located in the vicinity of a light source part in an illumination device for radiating light in which a predetermined wavelength component is reduced by pigment.SOLUTION: A lamp 2 of an illumination device comprises: a light source part 3; a wavelength selective absorption part 5 including pigment 51 which selectively absorbs light of a predetermined wavelength range; and a planar light guide 4 for guiding light emitted from the light source part 3 toward the inner side of the lamp 2, and deriving it toward the wavelength selective absorption part 5. In this configuration, the light from the light source part 3 is guided inside the planar light guide 4 and then enters the wavelength selective absorption part 5. Therefore, compared with the case where the light from the light source part directly enters the wavelength selective absorption part, the pigment 51 becomes less likely to be exposed to high luminance light and heat from the light source part 3, and also optical path length in the wavelength selective absorption part 5 becomes uniform. Therefore, occurrence of luminance unevenness and color unevenness of the irradiation light can be reduced, and denaturation of the pigment 51 located in the vicinity of the light source part 3 can be prevented. 【課題】色素によって所定の波長成分が低減された光を照射する照明装置において、照射光の輝度むら及び色むらの発生を低減し、また、光源部の近傍に位置する色素の変性を防止する。【解決手段】照明装置の灯具２は、光源部３と、所定波長域の光を選択的に吸収する色素５１を内含する波長選択吸収部５と、光源部３から出射された光を灯具２の内方に向かって導光しつつ波長選択吸収部５に向けて導出する面状導光体４と、を有する。この構成によれば、光源部３からの光が、面状導光体４の内部を導光されてから波長選択吸収部５に入射する。そのため、光源部からの光が直接に波長選択吸収部に入射する場合に比べて、色素５１が光源部３からの高輝度光や熱に曝され難くなり、また、波長選択吸収部５における光路長が均一になる。従って、照射光の輝度むら及び色むらの発生を低減することができ、また、光源部３の近傍に位置する色素５１の変性を防止することができる。【選択図】図２