Flash photographing system

Details Flash photographing system Flash photographing system

1982-11-24

1985-02-26

Hix, L. T.

354415, 354418, G03B 716, G03B 1502, G03B 1503

Patent

active

045014817

ABSTRACT:
A flash device for a photographic camera either inhibits a flashing action or shifts the control mode of the camera from flash photography to daylight photography in cases where the object to be photographed is located outside of an adequately operable distance range. A pre-flashing action detects a distance to the object when a main capacitor is charged to a given level before the capacitor is fully charged for flash photography. Then flash photography is performed at an aperture value determined on the basis of the detected distance when the distance is within the adequately operable distance range. When the detected distance is outside of the adequately operable distance range, the main capacitor is further charged for an increased flashing power. Then the distance to the object is again detected by a second preflashing action before flash photography is carried out at an aperture value determined on the basis of the distance detected by the second pre-flashing action. The flash photography arrangement thus permits seizing a shutter chance for flash photographing an object located at a relatively short distance without waiting until the main capacitor is fully charged.

REFERENCES:
patent: 4327978 (1982-05-01), Ishida et al.

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