Focus adjustment system for an image display device

Abstract

An image display device includes an image display element, a light source, an illumination system, a projector system comprising a refractive optical system including a plurality of lens groups, and a mirror train including a curved mirror, a first focus structure configured to move the respective lens groups of the refractive optical system by different amounts along a normal line of the image display element, and a second focus structure configured to move the respective lens groups along the normal line of the image display element by different amounts from those of the first focus structure.

What is claimed is: 
     
         1 . An image display device comprising:
 an image display element;   a light source;   an illumination system;   a projector system comprising a refractive optical system including a plurality of lens groups, and a mirror train including a curved mirror;   a first focus structure configured to move the respective lens groups of the refractive optical system by different amounts along a normal line of the image display element; and   a second focus structure configured to move the respective lens groups along the normal line of the image display element by different amounts from those of the first focus structure.