Lens barrel standard position detection device and method

Details Lens barrel standard position detection device and method Lens barrel standard position detection device and method

1996-01-11

1998-03-31

Metjahic, Safet

Photography

Having variable focal length of camera objective

Power zoom

G03B 1700

Patent

active

057349371

ABSTRACT:
A lens barrel standard position detection device, attached to a lens barrel equipped with a fixed tube having a first member and a movable tube rotationally moving back and forth along an optical axis of the lens barrel and having a second member engaging the first member of the fixed tube, to detect when the movable tube reaches a predetermined standard position. The lens barrel standard position detection device includes an actuating element movable between a first position and a second position, the actuating element moving to the second position when a working plane portion of the second member moves into contact with the actuating element corresponding to the movable tube reaching the predetermined standard position along the optical axis, an urging member which maintains the actuating element in the first position in a normal state due to an urging force of the urging member, and a detection unit which detects when the actuating element moves to the second position which opposes the urging force of the urging member, thereby detecting the movable tube reaching the predetermined standard position.

REFERENCES:
patent: 4827296 (1989-05-01), Haraguchi et al.
patent: 5153626 (1992-10-01), Yamamoto
patent: 5278602 (1994-01-01), Honma et al.
patent: 5287137 (1994-02-01), Hara et al.
patent: 5307103 (1994-04-01), Machida
patent: 5543971 (1996-08-01), Nomura et al.

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