Electronic flash unit for fill-flash photography

Details Electronic flash unit for fill-flash photography Electronic flash unit for fill-flash photography

1978-10-23

1980-03-25

Miller, Jr., George H.

354 34, 354141, 354145, G03B 1505

Patent

active

041948181

ABSTRACT:
A quenchable electronic flash for use with a camera having an M-contact flash synchronization device, includes a flashtube for producing light, a light-responsive integrating circuit for producing a flash terminating signal when the quantity of light measured by the integrating circuit reaches a predetermined level representative of a desired film exposure, and a quench circuit responsive to the flash terminating signal for terminating the production of further light by the flashtube. A time control circuit, responsive to actuation of the flash synchronization device, energizes the integrating circuit substantially with initial opening movement of a shutter of the camera. As a result, the integrating circuit is prevented from responding to any light prior to initiation of an exposure interval and responds to a quantity of light that corresponds substantially to the light, e.g. ambient as well as flash, impinging on film in the camera during an exposure.

REFERENCES:
patent: 3568582 (1971-03-01), Uchida
patent: 3878433 (1975-04-01), Sato
patent: 4074288 (1978-02-01), Johnson

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