Control device for flash device used for camera

Details Control device for flash device used for camera Control device for flash device used for camera

1998-09-24

2000-02-22

Perkey, W. B.

Photography

With object illumination for exposure

Having preexposure illumination

396201, 396159, 396163, G03B 1505

Patent

active

060290110

ABSTRACT:
A control device for a flash device used for a camera, or a camera adapted to use a flash device, includes an object luminance detecting sensor part for making preliminary light emission before exposure and measuring object luminance obtained during the preliminary light emission, an aperture value determining circuit for determining a full-open aperture value of a photo-taking lens used for the camera, a deciding circuit for deciding an amount of light emission to be made by the flash device during exposure by the camera, in accordance with a detection result of the object luminance detecting sensor part and a determination result of the aperture value determining circuit, and a restraining circuit for finding whether the camera is in such a state as to have the full-open aperture value correctly determined by the aperture value determining circuit and, if the camera is found to be not in such a state as to have the full-open aperture value correctly determined by the aperture value determining circuit, restraining light-emission control of the flash device based on a decision of the deciding circuit from being performed.

REFERENCES:
patent: Re35877 (1998-08-01), Takagi
patent: 4541703 (1985-09-01), Kataoka et al.
patent: 4710012 (1987-12-01), Yamada
patent: 4717934 (1988-01-01), Kobayashi et al.

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