Image sensing device having a selectable detecting area

Details Image sensing device having a selectable detecting area Image sensing device having a selectable detecting area

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.

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