Lens barrel of camera

Details Lens barrel of camera Lens barrel of camera

1999-01-29

2000-07-25

Perkey, W. B.

Photography

Having variable focal length of camera objective

359700, G03B 1700, G02B 1514

Patent

active

060945346

ABSTRACT:
A first cam groove for driving a lens holding frame along the optical axis is formed in the internal circumferential surface of a rotatable cylinder supporting the lens holding frame therein. A first cam follower provided at the lens holding frame engages with the first cam groove. A second cam groove is formed in the internal circumferential surface of the rotatable cylinder along the first cam groove. A guide member is inserted in the rotatable cylinder movably along the optical axis and is provided with a second cam follower engaging with the second cam groove. A tension spring is stretched between the lens holding frame and the guide member. This causes the lens holding frame to be always pressed forward.

REFERENCES:
patent: 4386829 (1983-06-01), Sumi
patent: 5586467 (1996-12-01), Weber
patent: 5867740 (1999-02-01), Hamasaki
patent: 5907439 (1999-05-01), Matsui

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