Patent ID: 7862184
Filing Date: 2011-01-04
Classification: G03B

Abstract:
1. A projection display apparatus, comprising: a projection distance adjustment mechanism for adjusting a distance between a projection plane onto which a projection image is projected and an emitting position of projection light; a focus adjustment mechanism for making a focus adjustment of the projection image with respect to the projection plane; and a focus drive adjustment part for driving of the focus adjustment mechanism such that the projection image is properly focused onto the projection plane in accordance with the distance between the projection plane and the emitting position, wherein the projection distance adjustment mechanism comprises a fixing part and a driven part supported by the fixing part so as to be capable of being displaced, and a projection optical system including at least a projection lens is disposed in the driven part, wherein the projection optical system comprises a mirror that reflects the projection light that has passed through the projection lens in a direction approaching the projection lens, rather than in a direction perpendicular to an optical axis of the projection lens, and guides the projection light to the projection plane, the projection optical system is displaced in a direction of the optical axis of the projection lens in accordance with displacement of the driven part, and the distance between the emitting position of projection light reflected by the mirror and the projection plane is changed in accordance with displacement of the projection optical system.