Patent ID: 8556434
Filing Date: 2013-10-15
Classification: G03B,H04N

Abstract:
1. An image projection apparatus comprising: an optical modulation element; a projection lens configured to project light modulated by the optical modulation element onto a projection surface; an optical unit configured to guide light from a light source to the optical modulation element and to guide the light from the optical modulation element to the projection lens; a shutter mechanism disposed between the optical unit and the projection lens and configured to operate so as to be in an open state and a closed state; and a focus corrector configured to correct a focus variation generated by temperature changes of the optical unit and the projection lens by operating the projection lens based on a focus correction function, wherein the focus corrector changes the focus correction function in accordance with information relating to an operation of the shutter mechanism, and wherein the information relating to the operation of the shutter mechanism contains information indicating whether the shutter mechanism is in the open state or the closed state, and information indicating an operation log of the shutter mechanism.