Camera with an automatic focusing device

Details Camera with an automatic focusing device Camera with an automatic focusing device

1987-12-21

1989-11-21

Hix, L. T.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250201, G03B 310

Patent

active

048826014

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: 4734571 (1988-03-01), Hamada et al.
patent: 4766302 (1988-08-01), Ishida et al.

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