Programmed automatic exposure control

Details Programmed automatic exposure control Programmed automatic exposure control

1982-10-18

1985-02-05

Adams, Russell E.

354435, 354440, G03B 708

Patent

active

044975635

ABSTRACT:
An automatic exposure control method and device has photometry means for detecting the brightness of a subject and providing an output signal in response thereto, a shutter, driving means for driving the shutter toward a full aperture, closing means for closing the shutter in accordance with the output signal from the photometry means, and adjusting means for adjusting the photometry means in a stepwise manner to provide the output signal variably in accordance with the light detected and the opening position of the shutter. In one embodiment, the driving means for opening the shutter engages a series of contacts for correspondingly short-circuiting photoelectric elements providing the electrical signal output, thereby varying in a stepwise manner the charging of a capacitor in a comparator circuit for disengaging a solenoid controlling the shutter closing means.

REFERENCES:
patent: 3873987 (1975-03-01), Brauning et al.
patent: 4032935 (1977-06-01), Lermann et al.
patent: 4057812 (1977-11-01), Rentschler et al.
patent: 4122464 (1978-10-01), Yonemoto et al.
patent: 4350427 (1982-09-01), Kitai et al.

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