Automatic focus detection system
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United States of America Patent
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Jun 11, 1991
Issued Date -
N/A
app pub date -
May 12, 1989
filing date -
Dec 27, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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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