Title: Flash lamp signaling circuit employing logic signal activation

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.

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Inventors: Ellin, Seymour (Brookline, MA, US)

Application Number: 353007
Filing Date: 1973-04-20
Publication_date: 1976-01-27
Assignee: Polaroid Corporation (Cambridge, MA)
Primary Class(es): 361/249 431/359
Other Classes:
US Patent Ref:

3518487	Jun, 1970	Tanaka	431/95.
3618492	Nov, 1971	Ellin	95/11.
3668468	Jun, 1972	Kornrumpf	315/323.
3676045	Jul, 1972	Watrous	431/95.
3699861	Oct, 1972	Burgarella et al.	354/142.
3728947	Apr, 1973	Harnden et al.	354/128.
3787167	Jan, 1974	Watrous	431/95.

Other Refs:
Primary Examiner: Truhe, J. V.
Assistant Examiner: Shaw, Clifford C.
Attorney: Thornton; David R.