The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 01, 2008
Filed:
Oct. 05, 2007
Toshifumi Takaoka, Tokyo, JP;
Toshifumi Takaoka, Tokyo, JP;
Sony Corporation, Tokyo, JP;
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 () for generating driving pulses having pulsed voltages, a liquid-crystal light-amount adjusting unit () for changing the optical transmittance of a liquid crystal according to pulse shapes of the driving pulses, and a microcomputer () for controlling frequencies and duty ratios of the driving pulses. The microcomputer () exercises control so that the driving-pulse generating circuit () 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.