Optical unit and projection type image display unit using it
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United States of America Patent
Stats
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Jul 10, 2007
Grant Date -
Jun 15, 2006
app pub date -
Mar 26, 2004
filing date -
Mar 27, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical unit includes a light source, a color separator, reflection-type image display elements, a color synthesizer, a reflection-type polarization plate, and an optical chassis. The optical chassis holds the reflection-type polarization plate and the reflection-type image display elements thereon, and has a translucent window on an incident light side of the reflection-type polarization plate while an exiting light side of the reflection-type polarization plate is sealed with an incident surface of the color synthesizer. A hermetically sealed space is defined by the optical chassis, the reflection-type image display elements and the incident surface of the color synthesizer, and within the hermetically sealed space is disposed a translucent liquid having a refraction index from 1.2 to 1.9.
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