Lens barrel for use in zoom lens apparatus

摘要

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.