Electronic flash unit for cameras adapted to receive flashbulbs

Details Electronic flash unit for cameras adapted to receive flashbulbs Electronic flash unit for cameras adapted to receive flashbulbs

1974-08-01

1976-07-13

Peters, Jr., Joseph F.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Plural load device systems

315241P, 354145, G03B 1503

Patent

active

039697371

ABSTRACT:
An electronic flash unit for use with cameras having a flash lamp firing mechanism adapted to fire flash lamps in timed relation with the operation of a camera shutter. An electronic time delay circuit coupled to the flash lamp firing mechanism energizes a flash unit trigger circuit to fire the flashtube in synchronism with the camera shutter. A voltage-sensitive switching element renders the delay circuit operative once the flash unit firing capacitor is charged above a predetermined level. With this arrangement, the flash-firing mechanism cannot energize the flashtube trigger circuit when there is insufficient firing capacitor voltage.

REFERENCES:
patent: 3424071 (1969-01-01), Schwahn
patent: 3559548 (1971-02-01), Ackerman
patent: 3559549 (1971-02-01), Ackerman
patent: 3842428 (1974-10-01), Kawasaki
patent: 3919593 (1975-11-01), Nakamura

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