Electronic flash units

Details Electronic flash units Electronic flash units

1985-01-23

1986-06-03

Adams, Russell E.

354132, 354137, 3541451, G03B 970

Patent

active

045926395

ABSTRACT:
An electronic flash unit of the dynamic flat flash type includes a flash control circuit which produces a flash termination signal by detecting the fact that a value associated with pulse flashes reaches a predetermined level and further produces a flash resumption signal within a period of time less than the deionization time of a flash discharge tube after the flash termination signal has been produced. With the flash control circuit, the electronic flash unit permits the discharge tube to repeatedly emit a pulse flash during an exposure operation of a shutter of a camera so that the flash characteristics substantially equivalent to a continuous flash can be obtained.

REFERENCES:
patent: 3438766 (1969-04-01), Biber
patent: 4437748 (1984-03-01), Kelly
patent: 4444479 (1984-04-01), Johnson et al.

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