Lens barrel for camera

Details Lens barrel for camera Lens barrel for camera

1991-05-13

1993-04-06

Griffin, Donald A.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 68B, G03B 118

Patent

active

052007766

ABSTRACT:
A lens barrel for a camera wherein an outer profile thereof has a reduced dimension in a radial direction of a movable lens and with a lens holding member that can be moved smoothly in a direction of an optical axis of the movable lens held on the barrel. The lens barrel comprises an outer shell having a pair of guide portions provided therein and a lens holding member holding a movable lens thereon. The lens holding member has a pair of guide portions provided at the opposite locations thereof with respect to the optical axis and is supported at the guide portions thereof for sliding movement on the guide portions of the outer shell. The lens barrel further comprises an actuator including a coil securely mounted on the lens holding member and a magnet securely mounted on the outer shell. The coil and magnet are disposed coaxially to each other around the optical axis. Position detecting means is disposed in a spaced relationship by substantially equal distances from the guide portions of the lens holding member and detects a position of the lens holding member with respect to the outer shell.

REFERENCES:
patent: 4002405 (1977-01-01), Stahl
patent: 4534624 (1985-08-01), Toda et al.
patent: 4676605 (1987-06-01), Toda et al.
patent: 4845456 (1989-07-01), Abe et al.
patent: 5061952 (1991-10-01), Ogawa
patent: 5078472 (1992-01-01), Sugawara
Patent Abstracts of Japan, vol. 13, No. 375 of Aug. 21, 1989.
Patent Abstracts of Japan, vol. 12, No. 216 of Jun. 21, 1988.
Patent Abstracts of Japan vol. 14, No. 25 of Jan. 18, 1990.

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