| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to project an image free of a color slip even when defocusing occurs by diffusing and mixing respective color light components R, G, B to be mixed on a screen by a diffusing means and then projecting the mixed color beam for an enlarged image by a projection lens. SOLUTION: Light from a liquid crystal panel part 9 is made incident upon a diffusing plate 11 through a projection lens 10. Respective light components R, G, B are made incident upon a Fresnel lens surface of the plate 11, converted into a parallel beam and diffused by the microlens surface of the exit side, so that a mixed color beam is projected. Since the plate 11 is constituted of the microlens surface, respective color components R, G, B can be mixed at a proper diffusion degree suppressing the drop of light efficiency. The mixed color beam is projected on a screen 20 as an enlarged image by a projection lens 12. Since respective color components R, G, B are mixed by the diffusion plate 11 and a generated color beam is projected on the screen 20, the generation of a color slip can be prevented even when defocuing is generated due to the inclination or the like of the screen 20. |
