Lens driving device

Details Lens driving device Lens driving device

1997-07-29

1999-06-29

Adams, Russell

Photography

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

Auto/manual mode selection

396103, 396131, G03B 300

Patent

active

059180781

ABSTRACT:
A lens driving device is disclosed, whereby it is made unnecessary for a user side to determine focusing when focusing is to be performed by an operation ring in a manual preference automatic focusing mode. The lens driving device includes an operation ring rotated for performing automatic focusing, a rotary encoder for detecting the operation amount of the operation ring, a motor for performing lens driving according to an operation amount detected by the rotary encoder, a body side CPU for detecting a defocusing amount at least during lens driving and a lens side CPU for forcibly stopping the lens driving of the motor when a defocusing amount detected by the body side CPU becomes equal to a preset value or lower.

REFERENCES:
patent: 4724454 (1988-02-01), Misawa
patent: 4845521 (1989-07-01), Akashi
patent: 4851869 (1989-07-01), Ishimaru et al.
patent: 4933701 (1990-06-01), Matsuyama
patent: 5177524 (1993-01-01), Tanaka
patent: 5229800 (1993-07-01), Kanno et al.
patent: 5572373 (1996-11-01), Imanari et al.
patent: 5583602 (1996-12-01), Yamamoto
patent: 5708872 (1998-01-01), Fukino

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