Light-quantity control device

Details Light-quantity control device Light-quantity control device

G - Physics

03

B

G03B 7/085 (2006.01) G03B 7/08 (2006.01) G03B 7/10 (2006.01) G03B 7/18 (2006.01)

Patent

CA 2058396

A light-quantity control device includes a drive source, a light-quantity control member which is arranged to vary the amount of opening of an aperture by shifting its position, and a speed control part which is arranged to control the driving speed of the drive source in proportion to a rate of change per unit time of the area of the aperture of the light-quantity control member.

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