Patent ID: 8089692

Claim:
A projection type image display apparatus comprising: an optical engine that emits a light according to image signal, a Fresnel lens on which the light emitted by the optical engine is incident, the Fresnel lens emitting the light as a parallel light, a diffusion member that diffuses the parallel light emitted by the Fresnel lens, a driving unit that moves the Fresnel lens or the diffusion member in a plane parallel to an emitting surface of the Fresnel lens or the diffusion member, a frame the supports the Fresnel lens, the diffusion member and the driving unit, a resilient supporting body that supports a weight of the Fresnel lens or the diffusion member with respect to the frame, and a holding unit that holds the Fresnel lens or the diffusion member supported by said resilient supporting body so as to be movable in x and y axis directions of the plane parallel to the emitting surface of the Fresnel lens or the diffusion member.