IMAGE DISPLAY DEVICE

摘要

Provided is an image display device which exhibits highly linear scanning properties without necessitating the enlargement of the device. The image display device is provided with an optical scanning unit which scans the light emitted from a light source in a first direction and a second direction of an image surface by means of the reciprocating rotational movement of a reflection surface for the light, and an optical system which enlarges the scanning angle of the scanned light, wherein the optical system comprises a free-form surface lens at the optical scanning unit side, and a free-form surface mirror at the image surface side. The length in the first direction is longer than the length in the second direction, and the free-form surface mirror may be located so that the first direction is substantially parallel to a first plane defined by incoming light rays and reflection light rays to and from the free-form surface mirror when the optical scanning unit remains stationary at the center of a scanning range.