Abstract: An image projection apparatus 500 includes an optical modulation element 206R, 206G, 206B, a projection lens 100 configured to project light modulated by the optical modulation element onto a projection surface, an optical unit 201 configured to guide light from a light source 209 to the optical modulation element and to guide the light from the optical modulation element to the projection lens, a shutter mechanism 300 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 501 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. The focus corrector changes the focus correction function in accordance with information relating to an operation of the shutter mechanism.

Abstract: The image projection apparatus includes a color separation/combination unit separating light into color lights to introduce them to light modulation elements and combining the lights modulated by the light modulation elements, a projection optical system projecting projection light that is the combined color lights onto a projection surface, an image-pickup element capturing a projected image, and a controller performing AF by using an output from the image-pickup element. The color separation/combination unit includes an optical film surface reflecting or transmitting at least one of the color lights and a non-effective surface.

Abstract: An image projection apparatus 500 includes an optical modulation element 206R, 206G, 206B, a projection lens 100 configured to project light modulated by the optical modulation element onto a projection surface, an optical unit 201 configured to guide light from a light source 209 to the optical modulation element and to guide the light from the optical modulation element to the projection lens, a shutter mechanism 300 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 501 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. The focus corrector changes the focus correction function in accordance with information relating to an operation of the shutter mechanism.