Electromagnetically-driven automatic iris device not requiring s

Details Electromagnetically-driven automatic iris device not requiring s Electromagnetically-driven automatic iris device not requiring s

1990-12-11

1993-03-23

Razavi, Michael T.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358209, 358909, 3542711, H04N 5238

Patent

active

051969408

ABSTRACT:
A light quantity adjusting device adjusts the quantity of light by moving a light quantity adjusting member by means of an electromagnetic driving part. The device includes a circuit arranged to drive the electromagnetic driving part by producing a pulse output at a period which is shorter than the time constant of the electromagnetic driving part.

REFERENCES:
patent: 3995208 (1976-11-01), Parr
patent: 4084893 (1978-04-01), Flandorfer
patent: 4325614 (1982-04-01), Grimes
patent: 4651068 (1987-03-01), Meshkat-Razavi
patent: 4998129 (1991-03-01), Watanabe et al.
patent: 5047796 (1991-03-01), Tagani et al.
patent: 5049997 (1991-09-01), Arai

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