Light-quantity control device

Details Light-quantity control device Light-quantity control device

1995-04-06

1997-07-08

Phan, James

Optical: systems and elements

Light control by opaque element or medium movable in or...

Electro-mechanical

359227, 396213, 396439, 396505, 396510, G02B 2602

Patent

active

056467702

ABSTRACT:
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.

REFERENCES:
patent: 4335947 (1982-06-01), Lange
patent: 4731626 (1988-03-01), Kawamoto
patent: 4862207 (1989-08-01), Asakura et al.
patent: 4974001 (1990-11-01), Watanabe et al.
patent: 5134435 (1992-07-01), Tsuboi et al.

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