Liquid-crystal luminaire consisting of an optical shutter and a metal halide lamp

Kuniharu Takizawa, Takanori Fujii, Hideo Fujikake, Tsunehiro Hirabayashi, Yoshiaki Tanaka, Kohji Hara, Satoshi Takano, Hisashi Asakawa, Hiroshi Kita

研究成果: Article査読

抄録

We made a liquid-crystal (LC) luminaire for the first time to our knowledge by combining a metal halide lamp and an optical shutter composed of a compound of a very high nematic-isotropic point (172 °C) LC and a polymer (CLCP). The shutter can modulate high-power light independently of the state of polarization because the CLCP film becomes transparent or opalescent when either sufficiently high or no voltage is applied to it. To solve the problem, which is peculiar to CLCP films, that the color temperature of light modulated by the film changes with the film's transmittance, a pulse-width modulation method that varies the time ratio of the on and off states of the shutter was developed. The performance characteristics of the luminaire were as follows: illuminance range, 192 to 10,400 lx at a distance of 5 m from the luminaire; rise and decay times, 1.4 and 1.5 ms; color temperature, 4060-5600 K; operation room temperature, ∼150 °C; stable operation time, more than 2000 h. Experimental results show the feasibility of applications of this luminaire in various fields, including television, movie, and stage lighting.

本文言語English
ページ(範囲)2614-2615
ページ数2
ジャーナルApplied optics
38
12
出版ステータスPublished - 1999 4 20
外部発表はい

ASJC Scopus subject areas

  • 原子分子物理学および光学
  • 工学(その他)
  • 電子工学および電気工学

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