Lens barrel

Details Lens barrel Lens barrel

1994-04-04

1996-12-10

Adams, Russell E.

Photography

Having variable focal length of camera objective

Having focus operation

396 85, 396133, 396134, G03B 118

Patent

active

055835953

ABSTRACT:
A lens barrel constructed of a cam slot, a lens cylinder, a memory, a detector, a motor drive and a controller. The cam slot has a discontinuous area formed in a portion corresponding to a parting line of a molding die used for molding. The lens cylinder has a cam follower slidably engaging the cam slot. The memory stores information indicating where the discontinuous area exists in the cam slot. The detector detects where the cam follower is positioned in the cam slot. The motor drive makes the lens cylinder progress and retreat in the optical-axis direction by driving one of the cam slot and the lens cylinder relative to the other. The controller controls the motor drive to drive the lens cylinder up to a position deviating from the discontinuous area when the cam follower is in the discontinuous area by comparing memory information of the memory with detection information of the detector.

REFERENCES:
patent: 4380378 (1983-04-01), Tamura
patent: 4386829 (1983-06-01), Sumi
patent: 4465344 (1984-08-01), Sumi
patent: 4484800 (1984-11-01), Tamura
patent: 4537487 (1985-08-01), Taniguchi et al.
patent: 4707083 (1987-11-01), Iizuka et al.
patent: 4767200 (1988-08-01), Inaba et al.
patent: 5037187 (1991-08-01), Oda et al.
patent: 5077571 (1991-12-01), Takayama et al.
patent: 5216549 (1993-06-01), Notagashira et al.

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