Quantity-of-light adjusting device

Details Quantity-of-light adjusting device Quantity-of-light adjusting device

1992-12-21

1994-01-25

Sugarman, Scott J.

Optical: systems and elements

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

358228, 354270, 354410, G02B 2602

Patent

active

052820750

ABSTRACT:
A quantity-of-light adjusting device comprises a driving part for driving a quantity-of-light adjusting member according to a change of the quantity of light passing through an aperture provided in the quantity-of-light adjusting member, a detecting circuit arranged to detect, as digital information, a change of the aperture of the quantity-of-light adjusting member, a converting circuit for converting the digital information output of the detecting circuit into speed information by differentiating the digital information, and a control circuit arranged to control a driving speed of the quantity-of-light adjusting member by feeding back the speed information output of the converting circuit to the driving part.

REFERENCES:
patent: 4304472 (1981-12-01), Shinoda et al.
patent: 5168365 (1992-12-01), Kawahara

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