Camera flash light control circuitry

Details Camera flash light control circuitry Camera flash light control circuitry

1982-09-30

1984-07-10

Adams, Russell E.

3541451, 354418, G03B 1505

Patent

active

044589956

ABSTRACT:
A dedicated electronic flash device capable of being combined with a camera and receiving a flash device identifying signal at a common terminal for establishing automatic aperture size control in a flash light exposure mode, and establishing manual aperture size control in the absence of the identifying signal. A flash light emission terminating signal, having a level greater than the identifying signal, is transmitted from the camera to the dedicated electronic flash device through the common terminal. The camera is capable of changing the automatic exposure time control and the aperture size control modes into respective flash light exposure modes in response to a charge completion signal transmitted from the electronic flash device through another terminal.

REFERENCES:
patent: 3726197 (1973-04-01), Hasegawa et al.
patent: 3987468 (1976-10-01), Matsuzaki et al.
patent: 4016575 (1977-04-01), Uchiyama et al.
patent: 4074290 (1978-02-01), Matsuzaki et al.
patent: 4311371 (1982-01-01), Kobori et al.
patent: 4344680 (1982-08-01), Ishida et al.
patent: 4368966 (1983-01-01), Hagyoda

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