Automatic exposure control system

Details Automatic exposure control system Automatic exposure control system

1980-05-30

1983-05-17

Schreyer, Stafford D.

354 38, G03B 7095

Patent

active

043837492

ABSTRACT:
The disclosed control system controls the diaphragm aperture of a camera in accordance with a preselected shutter time. A diaphragm scanner produces one pulse for each change of one stop in the size of aperture opening. When the required value of the diaphragm aperture, as determined in Apex form, is a number having an integer and a decimal fraction, the diaphragm aperture is adjusted in accordance with the integer, and the shutter time is adjusted to a value obtained by factoring the decimal fraction into the preset value of shutter time. Corresponding adjustment of the shutter time assures a one-eighth-stop accuracy in exposure control despite the diaphragm aperture being varied in one-stop increments.

REFERENCES:
patent: 3964073 (1976-06-01), Kobori et al.
patent: 4037233 (1977-07-01), Shinoda et al.
patent: 4054887 (1977-10-01), Holle et al.
patent: 4079386 (1978-03-01), Murakami et al.
patent: 4079387 (1978-03-01), Kaamura et al.
patent: 4089011 (1978-05-01), Date et al.
patent: 4090208 (1978-05-01), Shinoda et al.

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