Optical unit and projection type image display unit using it

Details Optical unit and projection type image display unit using it Optical unit and projection type image display unit using it

2007-07-10

2007-07-10

Koval, Melissa Jan (Department: 2851)

Optics: image projectors

Polarizer or interference filter

C353S022000, C353S031000, C353S119000

Reexamination Certificate

active

10525514

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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