Television – Camera – system and detail – Optics
Patent
1995-06-02
1997-05-13
Peng, John K.
Television
Camera, system and detail
Optics
348345, H04N 5232
Patent
active
056297351
ABSTRACT:
An automatic focusing device which is capable of movably setting within an image sensing plane a focus detecting area for detecting the focused degree of an object image formed on the image sensing plane by a photo-taking optical system comprises a position detecting circuit for detecting the position of an object within the focus detecting area, a computing circuit for computing on the basis of information from the position detecting circuit a setting position for setting the focus detecting area, and a control circuit which is arranged to move the focus detecting area according to the output of the computing circuit and to vary and control at least one of the size, the moving range and the moving response speed of the focus detecting area according to information on the depth of field of the photo-taking optical system.
REFERENCES:
patent: 4647979 (1987-03-01), Urata
patent: 4853789 (1989-08-01), Murashima et al.
patent: 4872058 (1989-10-01), Baba et al.
patent: 4967280 (1990-10-01), Takuma et al.
patent: 5031049 (1991-07-01), Toyama et al.
patent: 5128768 (1992-07-01), Suda et al.
Arai Hideyuki
Fujiwara Akihiro
Kaneda Kitahiro
Suda Hirofumi
Toyama Masamichi
Canon Kabushiki Kaisha
Ho Tuan V.
Peng John K.
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