US 2002/0118468 A1 · Lens barrel for use in zoom lens apparatus

Abstract

A lens barrel for use in a zoom lens apparatus to address the needs of optical devices such as a liquid crystal projector equipped with higher magnification and higher accuracy is provided. That is, the lens barrel of the present invention includes: supporting projections provided on the outer periphery of a fixed barrel projecting therefrom to support a cam barrel in contact therewith in a small area for ensuring smooth rotation of the cam barrel; and alignment guides formed in the fixed barrel and the cam barrel to fit the cam barrel into the fixed barrel keeping a predetermined positional relationship therebetween, thereby enabling the operation for adjusting the position of transmission of light having passed through a liquid crystal panel within a projection lens to be performed without any trouble.

Claims14

Dependent claims

A lens barrel for use in a zoom lens apparatus, comprising:

a fixed barrel holding a zoom lens system;
and
a cam barrel freely fitted to said fixed barrel and made to rotate around an optical axis direction with respect to said fixed barrel to move said zoom lens system in said optical axis direction,
wherein said fixed barrel being further constructed such that an appropriate number of radial supporting projections constituting a part of an outer periphery of said fixed barrel and projecting an appropriate length in both a circumferential direction of said fixed barrel and said optical axis direction are provided on portions of said fixed barrel, said portions being located in correspondence with ends of said cam barrel while facing said associated ends thereof, and
wherein said cam barrel being supported by said supporting projections.

2 more elements

A lens barrel for use in a zoom lens apparatus, comprising:

a fixed barrel holding a zoom lens system and at the same time, a focus lens system in a front end thereof;
a cam barrel freely fitted to said fixed barrel and rotating around an optical axis direction as an axis with respect to said fixed barrel to move said zoom lens system in said optical axis direction;
and
an input member fixed to said cam barrel to rotate said cam barrel,
wherein said cam barrel comprising a control section formed on an outer periphery of said cam barrel for restricting movement of said input member in said optical axis direction to thereby limit the degree of longitudinal engagement of said input member with said cam barrel.

2 more elements

Dependencies are inferred from the claim text.

Lens barrel for use in zoom lens apparatus

Life of this patent

Lens barrel for use in zoom lens apparatus

Life of this patent

Abstract

Claims14