1987-05-15
1989-05-16
Perkey, W. B.
354403, 354430, 3541731, 354406, 354432, G03B 300, G03B 100
Patent
active
048314030
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 object lens is driven to an infocus condition.
REFERENCES:
patent: 4523829 (1985-06-01), Eguchi et al.
patent: 4561749 (1985-12-01), Utagawa
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.
Hamada Masataka
Ishibashi Kenji
Ishida Tokuji
Karasaki Toshihiko
Norita Toshio
Minolta Camera Kabushiki Kaisha
Perkey W. B.
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