| 摘要 |
PURPOSE:To easily adjust a color shift by providing projection lens by colors and providing each projection lens with an enlargement magnification varying mechanism and a position adjusting mechanism which moves and adjust the position in a plane perpendicular to an optical axis. CONSTITUTION:Focus adjusting rings 101a-101c of the respective projection lenses 100a-100c are adjusted to form images on a screen sharply. Then, three images are made coincident to obtain one multicolor image. When the image formed in the respective colors are different in size, they are adjusted by using the enlargement rate adjusting rings 102a-102c of the respective projection lenses, thereby equalizing those images in size as the 1st stage. The projection lenses 100a-100c are moved in the planes perpendicular to the optical axes and micrometers 103a-103c and 104a-104c for fine movement are used as the 2nd stage. Consequently, the images of red, green, and blue are obtained and even if those images shift in position owing to vibrations, etc., they can be adjusted immediately. |
