Flash lamp signaling circuit employing logic signal activation

Details Flash lamp signaling circuit employing logic signal activation Flash lamp signaling circuit employing logic signal activation

1973-04-20

1976-01-27

Truhe, J. V.

Combustion

Heated line section feeds flame holder

Unheated oxidizer supply to line between heated section and...

431 95, F21K 502

Patent

active

039355144

ABSTRACT:
A photographic flash firing circuit operative to sequentially ignite each of an array of flash lamps in a predetermined order from first to last responsive to an input signal. The circuit is constructed as an integrated circuit including a dual set of circuit components capable of being interconnected for either low level, logic triggering or pulse triggering of the circuit. Basically, the firing circuit includes a plurality of lamp switching circuits and a forward sequencing circuit which sequentially couples each lamp across a supply voltage in accordance with repetitive activation by a suitable trigger network. In the logic trigger arrangement, the trigger network includes a transistor buffer stage and voltage divider network coupled to the forward sequencing circuit and operative to trigger the latter in accordance with operation of the camera exposure control system.

REFERENCES:
patent: 3518487 (1970-06-01), Tanaka
patent: 3618492 (1971-11-01), Ellin
patent: 3668468 (1972-06-01), Kornrumpf
patent: 3676045 (1972-07-01), Watrous
patent: 3699861 (1972-10-01), Burgarella et al.
patent: 3728947 (1973-04-01), Harnden et al.
patent: 3787167 (1974-01-01), Watrous

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