Exposure time control circuit for camera with flash light device

Details Exposure time control circuit for camera with flash light device Exposure time control circuit for camera with flash light device

1979-01-12

1980-09-30

Hix, L. T.

354 50, 354149, G03B 1505, G03B 700

Patent

active

042252180

ABSTRACT:
In a camera provided with an electronic flash light device, the exposure time is controlled based on a manually selected condition when so required in case that the flash light device is not ready for emitting light. A light measuring circuit is connected with an exposure time signal generating circuit which is connected with a shutter speed control circuitry. In parallel with the light measuring circuit a manually operable exposure time selecting circuit is connected so that selection can be made between the automatic exposure control based on the output of the light measuring circuit and the manual exposure control based on the output of the manually operable exposure time selecting circuit. When the electronic flash light device is ready for emitting light with sufficient level of charge in the main capacitor of the flash light device, the exposure time is controlled based on a predetermined condition desirable for flash light photography.

REFERENCES:
patent: 4083059 (1978-04-01), Tsunekawa et al.
patent: 4091396 (1978-05-01), Sahara et al.
patent: 4096492 (1978-06-01), Land et al.

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