Electronic flash device

Details Electronic flash device Electronic flash device

1982-09-15

1984-09-04

Gellner, Michael L.

G03B 1505, G03B 1718

Patent

active

044694199

ABSTRACT:
In a flash photography system wherein an electronic flash is fired to illuminate an object to be photographed, a light measuring circuit measures the light reflected from the object and generates a stop signal when the integration of the measured light attains a given level, and the flash firing is interrupted in response to the stop signal, an indication is made when the stop signal is generated within a predetermined period from the generation of a synchro signal for firing the flash tube in conjunction with shutter opening, the period is longer than the period required for the flash tube to fully emit its light, i.e. consuming fully the charge stored in the main capacitor. The period may be approximately equal to or a little longer than a maximum flash synchronizable shutter speed. Thus, there is an indication that a proper flash photography has been made, not only when the flash firing is interrupted before the flash tube has emitted the light fully, but also when a proper exposure is attained after the full light emission of the flash tube.

REFERENCES:
patent: 4086582 (1978-04-01), Kiyohara et al.
patent: 4189219 (1980-02-01), Hasegawa et al.
patent: 4295717 (1981-10-01), Kitagawa
patent: 4300825 (1981-11-01), Kitaura et al.
patent: 4309092 (1982-01-01), Kitagawa
patent: 4340284 (1982-07-01), Ohtsubo et al.
patent: 4349260 (1982-09-01), Ishida et al.
patent: 4363542 (1982-12-01), Kondo et al.
patent: 4367023 (1983-01-01), Ishida et al.
patent: 4367932 (1983-01-01), Ishikawa et al.

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