Patent ID: 7866823
Filing Date: 2011-01-11
Classification: G02B,G03B

Abstract:
1. An image projection apparatus comprising: an image-forming element configured to be illuminated with light from a light source; a projection lens configured to include a focus lens and configured to project light from the image-forming element onto a projection surface; plural temperature detectors configured to be provided at positions different from each other in the image projection apparatus and configured to detect temperatures at the respective positions as detection results; a controller configured to control the position of the focus lens on the basis of the detection results by the plural temperature detectors; and an optical member configured to introduce the light from the image-forming element to the projection lens, wherein a first temperature detector of the plural temperature detectors is configured to detect the temperature of the optical member or in a region adjacent thereto, and wherein the region adjacent to the optical member is closer to the optical member than the projection lens.