Television – Camera – system and detail – Optics
Reexamination Certificate
2007-10-05
2008-07-01
Villecco, John M. (Department: 2622)
Television
Camera, system and detail
Optics
C348S340000, C348S362000, C349S104000
Reexamination Certificate
active
07394498
ABSTRACT:
A liquid-crystal light-amount adjusting device in which the effective power of driving pulses for acceleration is optimized to improve response characteristics of optical transmittance, a method of driving the apparatus, and a camera including the apparatus. The liquid-crystal light-amount adjusting device according to the present invention includes a driving-pulse generating circuit (16) for generating driving pulses having pulsed voltages, a liquid-crystal light-amount adjusting unit (12) for changing the optical transmittance of a liquid crystal according to pulse shapes of the driving pulses, and a microcomputer (19) for controlling frequencies and duty ratios of the driving pulses. The microcomputer (19) exercises control so that the driving-pulse generating circuit (16) generates driving pulses including driving pulses for acceleration, having a pulse shape with a first frequency and a first duty ratio, and driving pulses for dimming, having a pulse shape with a second frequency that is different from the first frequency and a second duty ratio that is different from the first duty ratio.
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English translation of Japanese Patent Publication 55-87126 translated by: FLS, Inc. Nov. 2006.
English Abstract for IDS Japanese reference 11-95206 published Apr. 9, 1999 to Kawada et al.
English Abstract for IDS Japanese reference 7-129134 published May 19, 1995 to Yamagishi et al.
English Abstract for IDS Japanese reference 62-118326 published May 29, 1987 to Enari et al.
Frommer William S.
Frommer & Lawrence & Haug LLP
Levy Paul A.
Pasiewicz Dan
Sony Corporation
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