The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 27, 1976
Filed:
Apr. 20, 1973
Seymour Ellin, Brookline, MA (US);
Polaroid Corporation, Cambridge, MA (US);
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.