Light quantity control device

Details Light quantity control device Light quantity control device

1995-07-25

2000-05-16

Garber, Wendy

Television

Camera, system and detail

Optics

318268, H04N 5238, H02P 500

Patent

active

06064432&

ABSTRACT:
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.

REFERENCES:
patent: 4084122 (1978-04-01), Gettings
patent: 4134653 (1979-01-01), Ishiguro et al.
patent: 4472743 (1984-09-01), Ogasaware et al.
patent: 4651216 (1987-03-01), Arai et al.
patent: 5072162 (1991-12-01), Sato et al.

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