Projection optical system unit and projection-type image...

Details Projection optical system unit and projection-type image... Projection optical system unit and projection-type image...

2008-04-22

2008-04-22

Lee, Diane I. (Department: 2851)

Optics: image projectors

Housing

C353S122000, C353S078000, C353S057000, C353S037000, C359S449000, C359S460000, C359S634000, C359S858000, C359S859000, C359S864000

Reexamination Certificate

active

07360906

ABSTRACT:
A projection optical system unit has a lower pedestal. The lower pedestal has first and second tubular portions opened to each other. An image formation device holding plate for a DMD is mounted on the first tubular portion at a side where one opening is formed. A mirror holder for a convex mirror is fixed on the second tubular portion at a side where the other opening is formed. A linear heat expansion coefficient in a specific direction of the lower pedestal component is set between 0.8×10−5(1/K) and 3.0×10−5(1/K).

REFERENCES:
patent: 6527397 (2003-03-01), Furuichi et al.
patent: 6626541 (2003-09-01), Sunaga
patent: 6752500 (2004-06-01), Yoshii et al.
patent: 6779894 (2004-08-01), Shiraishi et al.
patent: 6805447 (2004-10-01), Takeuchi
patent: 2002/0126263 (2002-09-01), Konishi
patent: 2003-215714 (2003-07-01), None
patent: 2004-53658 (2004-02-01), None
patent: 2004-145264 (2004-05-01), None

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