Patent ID: 7880965
Filing Date: 2011-02-01
Classification: G02B,G03B

Abstract:
1. A projection-type image display device comprising: an optical engine that emits light in response to an image signal; a screen that includes a Fresnel lens that converts the light incident thereon from the optical engine to substantially collimated light, and a diffusing member that converts the collimated light incident thereon from the Fresnel lens to a diffuse light; a screen driving unit that displaces any of the Fresnel lens and the diffusing member, serving as a driven member, in a plane parallel to the screen; and a housing that accommodates the optical engine, the screen, and the screen driving unit, wherein the screen driving unit includes wherein, when projecting an image on the screen, the driving forces are applied to the elastic retaining unit from the pair of driving sources to cause the driven member to make continuous motion in the plane parallel to the screen.