Automatic focus control system for video camera with improved po

Details Automatic focus control system for video camera with improved po Automatic focus control system for video camera with improved po

1981-05-12

1983-07-12

Adams, Russell E.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358227, G03B 708

Patent

active

043927262

ABSTRACT:
An automatic focus control system for a video camera includes a first circuit which provides a detection signal having higher frequency components of a video signal provided by the video camera. The level of the detection signal varies according to a relative distance between the lens system of the video camera and the light receiving plane of the image pickup device of the video camera. The focus control system also includes a second circuit which detects an extreme value of the amplitude of the detection signal, and fixes the relative distance between the lens system and the light receiving plane of the image pickup device by stopping the actuation of the focusing mechanism of the video camera.

REFERENCES:
patent: Re30099 (1979-09-01), Hosoe et al.
patent: 3898676 (1975-08-01), Hosoe et al.
patent: 4005443 (1977-01-01), Albrecht
patent: 4053934 (1977-10-01), Kornreich et al.
patent: 4133606 (1979-01-01), Hosoe et al.
patent: 4184753 (1980-01-01), Hashimoto et al.
patent: 4277156 (1981-07-01), Fukushima et al.

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