LATCHING CIRCUITRY IN A CIRCUIT FOR SEQUENTIALLY FIRING PHOTOFLASH LAMPS

A latch circuit, for producing a lock-out signal which prevents a sequencing circuit from flashing more than one flash lamp of an array of flash lamps when a flash picture is taken, comprises a pair of transistors connected together in a regenerative feedback circuit. The latch circuit is actuated b...

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Bibliographische Detailangaben
1. Verfasser:	WATROUS, DONALD L
Format:	Patent
Sprache:	eng
Schlagworte:	ACCESSORIES THEREFOR APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM BLASTING CINEMATOGRAPHY COMBUSTION APPARATUS COMBUSTION PROCESSES ELECTROGRAPHY EXTINGUISHING-DEVICES HEATING HOLOGRAPHY IGNITION LIGHTING MECHANICAL ENGINEERING PHOTOGRAPHY PHYSICS WEAPONS
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Beschreibung
Zusammenfassung:	A latch circuit, for producing a lock-out signal which prevents a sequencing circuit from flashing more than one flash lamp of an array of flash lamps when a flash picture is taken, comprises a pair of transistors connected together in a regenerative feedback circuit. The latch circuit is actuated by a latch signal produced by a circuit which senses current flow to a flashing lamp. To prevent false actuation by spurious transient voltages, a transistor switch is connected to momentarily disable the latch circuit when spurious transient voltages occur.