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|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||354/25 ; 358/227|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 20 인용 특허 : 5|
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 ...
A focus control apparatus adapted to a camera including a lens system, image pickup means for providing a video signal disposed on the optical axis of the lens system, and moving means for varying a relative distance between a light receiving surface of the image pickup means and the lens system so that an object is focussed onto the light receiving surface, said relative distance being varied in a first direction or a second direction which is opposite to said first direction, comprising: first means coupled to said image pickup means including means fo...