| 摘要 |
PROBLEM TO BE SOLVED: To improve the utilization rate of light by correcting keystone distortion and by making the shape of the irradiation region formed by an illumination optical system nearly the same as the shape of an image forming device. SOLUTION: The magnified projection display device has the image forming device represented by a light valve, a DMD (Digital Micromirror Device), etc. The illumination optical system comprises: a light source; a condenser mirror which forms a virtual secondary light source by condensing the luminous flux from the light source; a luminance unevenness reducing element the incident end face of which is arranged at the position of a secondary light source, and which uniformizes the luminance distribution of the luminous flux from the secondary light source and emits the resultant luminous flux from an exit surface; and an afocal optical system which guides the emitted luminous flux from the luminance unevenness reducing element to the image forming element. COPYRIGHT: (C)2004,JPO
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