Light quantity control device

Details Light quantity control device Light quantity control device

G - Physics

02

B

G02B 26/02 (2006.01) G03B 9/60 (2006.01) H04N 5/238 (2006.01)

Patent

CA 2110646

A light quantity control device includes a motor, a light quantity control member arranged to be moved by the motor used as a drive source, a speed detecting part arranged to form speed information by using information on a change of the position of the light quantity control member, a first circuit arranged to generate a first control voltage for the motor, taking the speed information into consideration, and a second control circuit arranged to generate a second control voltage for the motor, the second control voltage being opposite in polarity to the first control voltage and having the same absolute value as the first control voltage.

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