Electronic flash apparatus for cameras

Details Electronic flash apparatus for cameras Electronic flash apparatus for cameras

1990-11-27

1992-04-28

Perkey, W. B.

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

Plural load device systems

315241P, 315136, G03B 1505, H05B 4126

Patent

active

051092441

ABSTRACT:
In a camera system including an electronic flash apparatus, a main capacitor of the flash apparatus is charged for a predetermined time interval, in response to a preparatory operation such as a first stroke of a release button. During this time interval, operation of an automatic distance measuring device, an automatic exposure controlling device and an object luminance discriminating circuit is prevented. A warning device warns a photographer that the main capacitor is insufficiently charged. Several voltage detectors detect different voltage levels of the main capacitor and produce detection signals for inhibiting the operation of the warning device and/or preventing further charging of the main capacitor.

REFERENCES:
patent: 4071884 (1978-01-01), Maigret
patent: 4100459 (1978-07-01), Nakamura et al.
patent: 4162836 (1979-07-01), Harrison
patent: 4361389 (1982-11-01), Monks et al.
patent: 4470684 (1984-09-01), Harvey
patent: 4519683 (1985-05-01), Hagyuda et al.
patent: 4693582 (1987-09-01), Kawamura et al.

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