Liquid-Crystal Luminaire Consisting of an Optical Shutter and a Metal Halide Lamp
Applied Optics, Vol. 38, Issue 12, pp. 2570-2578 (1999)
http://dx.doi.org/10.1364/AO.38.002570
Acrobat PDF (403 KB)
Abstract
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.
© 1999 Optical Society of America
[Optical Society of America ]
OCIS Codes
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(230.0250) Optical devices : Optoelectronics
(230.2090) Optical devices : Electro-optical devices
(230.3720) Optical devices : Liquid-crystal devices
(230.4110) Optical devices : Modulators
(350.4600) Other areas of optics : Optical engineering
Citation
Kuniharu Takizawa, Takanori Fujii, Hideo Fujikake, Tsunehiro Hirabayashi, Yoshiaki Tanaka, Kohji Hara, Satoshi Takano, Hisashi Asakawa, and Hiroshi Kita, "Liquid-Crystal Luminaire Consisting of an Optical Shutter and a Metal Halide Lamp," Appl. Opt. 38, 2570-2578 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-12-2570
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