ILLUMINATION DEVICE AND PROJECTOR
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United States of America Patent
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Sep 18, 2014
app pub date -
Mar 7, 2014
filing date -
Mar 15, 2013
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Abstract
A illumination device includes a light source, a diffractive optical element on which light emitted from the light source is made incident, and a superimposing optical system on which diffracted light emitted from the diffractive optical element is made incident. A direction of a principal ray in the center of the diffracted light coincides with an optical axis of the superimposing optical system. Consequently, it is possible to reduce an aberration due to the superimposing optical system and to emit illumination light having a more uniform illuminance distribution.
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