Focus detection device and accompanying optical equipment

Details Focus detection device and accompanying optical equipment Focus detection device and accompanying optical equipment

1996-03-06

1998-10-20

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

396 80, 396104, 396128, G01B 906

Patent

active

058250166

ABSTRACT:
Where a person is being photographed, for example, both light from the person located at closer range and light from the background located farther away enter the photodetector elements. Where the contrast of the background is high, the rate at which the information from the background contributes to the focus detection becomes larger, which hinders accurate focus detection with regard to the person. In this case, the focus detection device divides a predetermined focus area into smaller areas and detects focus condition in each smaller area.

REFERENCES:
patent: 4483602 (1984-11-01), Aoki et al.
patent: 4851657 (1989-07-01), Taniguchi et al.
patent: 4862204 (1989-08-01), Ishida et al.
patent: 4864117 (1989-09-01), Ishida et al.
patent: 5001507 (1991-03-01), Iida et al.
patent: 5202555 (1993-04-01), Ishida et al.
patent: 5602944 (1997-02-01), Yokoyama et al.

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