| 摘要 |
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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