Automatic focusing device and optical apparatus having the same

Details Automatic focusing device and optical apparatus having the same Automatic focusing device and optical apparatus having the same

1997-01-24

1999-05-04

Perkey, W. B.

Photography

With exposure objective focusing means, focusing aid, or...

Manually selected preset focus position or range

G03B 1336

Patent

active

058995862

ABSTRACT:
A focus adjusting apparatus comprises a motor serving as a drive source, a focusing unit which is driven by the motor and has at least a focusing lens, a focus detecting device which performs focus detection, an area setting device which sets a first area and a second area in an area in which the focusing unit is movable, a position detecting device which detects whether the focusing unit is located within the first area, and a motor control device which, when the focusing unit is located within the first area and the first area and the second area are set by the area setting device, forcibly drives the motor until the focusing unit moves out of the first area, and, then, drives and controls the motor on the basis of a result of focus detection performed by the focus detecting device in such a manner that the focusing unit performs a focus adjusting operation within the second area.

REFERENCES:
patent: 4611244 (1986-09-01), Hanma et al.
patent: 5061954 (1991-10-01), Toyama et al.

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