Lens barrel

Details Lens barrel Lens barrel

1996-07-10

1998-05-26

Adams, Russell E.

Photography

Having variable focal length of camera objective

Having focus operation

396 85, 396133, 396134, G03B 1700

Patent

active

057582050

ABSTRACT:
A lens barrel constructed of a cam slot, a lens cylinder, a memory means, a detecting means, a motor driving means and a control means. 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 ass a cam follower engaging with this cam slot. The memory means stores information indicating where the discontinuous area exists in the cam slot. The detecting means detects where the cam follower is positioned in the cam slot. The motor driving means makes the lens cylinder progress and retreat in the optical-axis direction by relatively driving the cam slot and the lens cylinder. The control means controls the motor driving means 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 mens with detection information of the detecting means.

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.
patent: 5583595 (1996-12-01), Hara et al.

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