Projection-type display optical system

Details Projection-type display optical system Projection-type display optical system

2006-06-27

2006-06-27

Perkey, William (Department: 2851)

Optics: image projectors

Reflector

C353S094000, C353S099000, C348S771000

Reexamination Certificate

active

07066607

ABSTRACT:
A projection type display optical system is provided to resolve problems of keystone distortion, and to improve illumination efficiency and contrast uniformity of an image. The system includes: a light source; an image display means on which a light ray is irradiated; and an illumination unit comprising: a rod lens emitting a brightness unified light ray; a first lens; an optical unit; and a projection part, wherein the first lens and the optical unit are set so that an optical axis of the optical unit and an optical axis of the first lens do not coincide with each other, whereby a surface image formed is not inclined to the surface of the image display means.

REFERENCES:
patent: 6129437 (2000-10-01), Koga et al.
patent: 6471356 (2002-10-01), Gohman et al.
patent: 6527396 (2003-03-01), Okamori et al.
patent: 6558007 (2003-05-01), Nakagawa et al.
patent: 6609798 (2003-08-01), Milinusic et al.
patent: 6799852 (2004-10-01), Sekiguchi et al.
patent: 2004/0184012 (2004-09-01), Hori

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