Exposure trim mechanism for cameras

Details Exposure trim mechanism for cameras Exposure trim mechanism for cameras

1981-02-20

1982-08-03

Adams, Russell E.

354 29, 354230, G03B 714

Patent

active

043425062

ABSTRACT:
A trim mechanism for an automatic exposure control system used in photographic cameras to regulate the rate at which a pair of scanning shutter blades are accelerated toward an open position so as to vary the effective flash aperture as well as to variably filter light passing to the photocell of an electronic system for closing the shutter blades. The mechanism includes an arrangement of a manually adjustable trim slide, a trim slide follower and a tension spring extending directly between the follower and the shutter blade mechanism so that the tension of the spring and thus the force by which the blades are driven to an open position is adjusted simultaneously with adjustment of a photocell filter variation.

REFERENCES:
patent: 2238500 (1941-04-01), Minalyi
patent: 3887934 (1975-06-01), Ettischer
patent: 3969738 (1976-07-01), Johnson et al.
patent: 4109258 (1978-08-01), Arisaka et al.
patent: 4209243 (1980-06-01), Johnson et al.

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