Projection optical system

Optics: image projectors – Composite projected image – Multicolor picture

Reexamination Certificate

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Details

C353S081000, C348S757000

Reexamination Certificate

active

10844451

ABSTRACT:
A reflective lighting optical system minimizes a back focusing distance and a depth of the system, and improves a lighting efficiency by disposing a wire grid type PBS (Polarized Beam Splitter) at an oblique angle with respect to a short side of an imager.

REFERENCES:
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patent: 6262851 (2001-07-01), Marshall
patent: 6281866 (2001-08-01), Robinson et al.
patent: 6299312 (2001-10-01), Choi et al.
patent: 6481852 (2002-11-01), Osaka
patent: 6666557 (2003-12-01), Choi
patent: 6910773 (2005-06-01), Nakashima et al.
patent: 2002/0191154 (2002-12-01), Shahzad et al.
patent: 2003/0081179 (2003-05-01), Pentico et al.
patent: 2004/0066492 (2004-04-01), Nakashima et al.
patent: 2004/0252285 (2004-12-01), Lang et al.
patent: 2005/0185144 (2005-08-01), Imahase et al.

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