Exposure control system for a photographic camera

Details Exposure control system for a photographic camera Exposure control system for a photographic camera

1981-02-27

1982-05-25

Hix, L. T.

354 60R, G03B 7087

Patent

active

043314015

ABSTRACT:
In a photographic camera with an automatic exposure control system, a voltage obtained by a light measuring circuit with reference to a reference voltage based on a film speed is divided into 1
and (n-1)
of the voltage. The scene brightness is measured while the diaphragm provided before a photosensor of the light measuring circuit is stopped down until the output voltage of the light measuring circuit becomes equal to 1
of the voltage. After the output voltage has become 1
of the voltage, the diaphragm is held in its position and then the shutter speed is controlled according to the (n-1)
voltage.

REFERENCES:
patent: 4062023 (1977-12-01), Kobori et al.
patent: 4090207 (1978-05-01), Mashimo et al.
patent: 4107707 (1978-08-01), Numata et al.
patent: 4146317 (1979-03-01), Date et al.
patent: 4150889 (1979-04-01), Ueda et al.
patent: 4174160 (1979-11-01), Nanba et al.

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