초록 ▼

A compact, lightweight and bright image display apparatus which uses a non-telecentric optical system, or a decentered optical system and a reflection-type image display device, such as a reflection-type LCD, to have high optical performance. The image display apparatus comprises an image display de

A compact, lightweight and bright image display apparatus which uses a non-telecentric optical system, or a decentered optical system and a reflection-type image display device, such as a reflection-type LCD, to have high optical performance. The image display apparatus comprises an image display device, and an ocular optical system which leads an image formed by the image display device to an eye point of an observer without forming an intermediate image so that the image can be observed as a virtual image. The ocular optical system comprises a decentered optical system having at least one decentered back-coated reflecting surface. The image display device is a reflection-type image display device which displays an image by reflection of illumination light. An illumination means for forming the illumination light is arranged outside an optical path between the reflection-type image display device and the eye point of the observer.

대표청구항 ▼

[ What is claimed is:] [1.]1. An image display apparatus, comprising:an image display device comprising a reflection-type image display device which displays an image by reflection of illumination light;an ocular optical system which leads an image formed by the image display device to an eye point

[ What is claimed is:] [1.]1. An image display apparatus, comprising:an image display device comprising a reflection-type image display device which displays an image by reflection of illumination light;an ocular optical system which leads an image formed by the image display device to an eye point of an observer without forming an intermediate image so that the image can be observed as a virtual image, the ocular optical system comprising a decentered optical system; andillumination means, arranged outside an optical path between the reflection-type image display device and the eye point of the observer, for forming the illumination light,wherein the decentered optical system comprises at least one reflecting surface which is a rotationally asymmetric surface having no axis of rotational symmetry,wherein the rotationally asymmetric surface is a plane-symmetry three-dimensional surface having only one plane of symmetry.