| 摘要 |
PROBLEM TO BE SOLVED: To provide an illuminator which hardly causes illuminance irregularity on a light valve such as a liquid crystal panel and efficiently illuminates the entire light valve, and provide an optical modulation device and a projection type display device. SOLUTION: By arranging a condenser lens 3 having such spherical aberration that a light beam passing area becomes larger as it is more separate from an optical axis for an LED 1 having characteristic that light becomes gradually weak as an angle from a front in a light emitting direction gets large, the light distribution characteristic of the LED is negated, whereby the illuminance irregularity is hardly caused on the light valve such as the liquid crystal panel, and the entire light valve is efficiently illuminated. COPYRIGHT: (C)2007,JPO&INPIT
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