Automatic electronic flash

Details Automatic electronic flash Automatic electronic flash

1984-11-13

1986-08-05

Perkey, William B.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Plural load device systems

3541271, 315241P, G03B 1502

Patent

active

046039589

ABSTRACT:
An automatic electronic flash measures brightness of a predetermined photographing angle including a photographic object, and using the measured brightness and film sensitivity indicates a stop value to be set in camera when the photographic scenery has rear light, and the automatic electronic flash operation is automatically lowered by the extent of F-stop value (automatic F-stop value) of 1-2 EV than the indicated stop value, thereby satisfactory automatic fill-in photographing with the automatic electronic flash can be made; and the automatic electronic flash further comprises means to warn when the brightness of the photographic scenery changes from the measured value, and besides, the above-mentioned controlling corresponding to the automatic F-stop value is examined taking account of the scenery brightness and film sensitivity and produce another warning when automatic F-stop value is an impractical value.

REFERENCES:
patent: 4074288 (1978-02-01), Johnson et al.
patent: 4174161 (1979-11-01), Mashimo et al.
patent: 4331400 (1982-05-01), Brownstein et al.
patent: 4375322 (1983-03-01), Coppa et al.
patent: 4456353 (1984-06-01), Mizokami
patent: 4456354 (1984-06-01), Mizokami

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