Liquid-crystal projector

Details Liquid-crystal projector Liquid-crystal projector

2007-02-20

2007-02-20

Nelms, David (Department: 2871)

Liquid crystal cells, elements and systems

Liquid crystal system

Projector including liquid crystal cell

C349S009000, C349S058000, C353S085000, C353S100000, C353S101000, C353S119000

Reexamination Certificate

active

10874200

ABSTRACT:
A projection unit comprises a light source unit and an image forming unit. The light source unit includes a light source section and an illuminating optical system which condenses the illuminating light and forms the illuminating light to approximately parallel rays. The image forming unit includes an image forming optical system which decomposes the illuminating light into three-primary-colors lights, radiates the three-primary-colors lights to liquid-crystal displays corresponding to each color, and composes the three-primary-colors image lights into full-color image light, and a projection lens which projects the full-color image light to a screen. The light source unit is contained in a light source unit case which is formed with a material excellent in heat resistance. The image forming unit is contained in an image forming unit case which is formed with a material which is not excellent in heat resistance. The light source unit case is attached to the image forming unit case in detachable manner. When modifying the light source section, the light source unit and the light source unit case are modified, but the image forming unit and the image forming unit case are not modified.

REFERENCES:
patent: 6793346 (2004-09-01), Nakano et al.
patent: 6935753 (2005-08-01), Takezawa et al.
patent: 2003/0108741 (2003-06-01), Niino et al.
patent: 2004/0189958 (2004-09-01), Lee
patent: 3257067 (2001-12-01), None
patent: 3339504 (2002-08-01), None

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