| 摘要 |
PROBLEM TO BE SOLVED: To provide a lighting device capable of increasing illumination efficiency further than in the case an ideal image formation system is constituted by constituting an optical system so as to dare to cause aberration on an optical image on a liquid crystal panel, a designing method for an aspherical lens used for the lighting device, the aspherical lens and a projector on which the lighting device is mounted. SOLUTION: Light emitted from a light source 3 is made parallel beams by a 1st optical system 5, and forms an image so that coma aberration and spherical aberration may be caused on the image of the parallel beams in the pixel area 7a of a liquid crystal device 7 by the aspherical lens 6. By forming the image so as to dare to cause the aberration in the pixel area 7a, the illumination efficiency in the pixel area 7a is made higher than when the image is formed by the ideal image formation system. COPYRIGHT: (C)2006,JPO&NCIPI
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