Automatic focus detection system

Details Automatic focus detection system Automatic focus detection system

1989-05-12

1991-06-11

Perkey, W. B.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

2502012, G03B 1336, G02B 728

Patent

active

050236466

ABSTRACT:
A camera with an automatic focusing device has an objective lens mounted on a camera. An image formed by the objective lens is divided into a plurality of zones. In each zone, a brightness distribution is obtained so as to detect a rough focusing condition in each zone, thereby producing a plurality of rough focusing condition data. Based on the result of the rough focusing condition data, one zone is selected. Furthermore, a precise focusing condition is detected in the selected zone based on the light contained in the selected zone, so as produce a precise focusing condition data. Based on the precise focusing condition data obtained from the selected zone, the objective lens is driven to an infocus condition.

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patent: 4561749 (1985-12-01), Utagawa
patent: 4562346 (1985-12-01), Hayashi et al.
patent: 4573784 (1986-03-01), Suzuki
patent: 4633073 (1986-12-01), Horikawa
patent: 4636624 (1987-01-01), Ishida et al.
patent: 4734571 (1988-03-01), Hamada et al.

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