Photographic flash control circuitry having selectively operable

Details Photographic flash control circuitry having selectively operable Photographic flash control circuitry having selectively operable

1980-01-16

1982-06-08

Gellner, Michael L.

354 33, 354 34, G03B 1505

Patent

active

043337180

ABSTRACT:
An external light integrating circuitry connectable over two-wires to a flash control circuitry, for causing automatic disabling of an internal light integrating circuitry connected within the control circuitry. The external integrating circuitry receives power over the two wires and transmits light integrating information back to flash termination circuitry within the control circuitry. Camera shutter contacts are connectable with the external integrating circuitry for transmitting a flash initiating signal via the two wires for initiating the photographic flash.

REFERENCES:
patent: 3601022 (1971-08-01), Languau
patent: 3737721 (1973-06-01), Ogawa
patent: 3774072 (1973-11-01), Ogawa
patent: 4249109 (1981-02-01), Ogawa

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