Exposure control device for cameras

Details Exposure control device for cameras Exposure control device for cameras

1982-07-16

1985-01-29

Perkey, William B.

354418, 354431, 354441, G03B 1505

Patent

active

044962304

ABSTRACT:
A flash photography system for a camera which is adapted to be used with an electronic flash device which supplies a control signal when the device is a ready condition. The camera includes a diaphragm control circuit which automatically control the diaphragm aperture in accordance with a measurement of the light from the scene to be photographed. The diaphragm control circuit includes a circuit for producing a first program signal for controlling the diaphragm aperture and camera exposure time in a first programmed relationship with the light measurement for daylight or natural light photography, and a circuit for produces a second program signal for controlling the diaphragm aperture in a second programmed relationship with the light measurement for flash photography. The second program signal is adapted to provide a proper exposure for the ambient light condition as well as the flash light illumination.

REFERENCES:
patent: 4153355 (1979-05-01), Ikawa et al.
patent: 4213682 (1980-07-01), Yamada
patent: 4367023 (1983-01-01), Ishida et al.

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