Apparatus and method for controlling exposure by shutter speed c

Television – Camera – system and detail – Optics

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348229, H04N 5238

Patent

active

055790496

ABSTRACT:
An object of the present invention is to bring a video signal obtained by imaging into a proper level without use of a controllable diaphragm. An imaging apparatus is provided with no controllable diaphragm. Peak detection is performed by a peak detecting circuit for each vertical scanning interval. A peak value is applied to a control device. Necessary shutter speed control in a shutter control circuit, gain control in a pre-amplifier circuit and gain control in a GCA are carried out. Consequently, the level of the video signal obtained by the imaging is adjusted to a proper level without controlling a diaphragm, to obtain an image of proper brightness.

REFERENCES:
patent: 3576393 (1971-04-01), Thompson
patent: 4202014 (1980-05-01), Gilligan et al.
patent: 4516172 (1985-05-01), Miyata et al.
patent: 4843476 (1989-06-01), Fujoka et al.
patent: 5157502 (1992-10-01), Nakajima et al.

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