Dual lamp projection system

Details Dual lamp projection system Dual lamp projection system

2005-08-30

2005-08-30

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Optical modulator

C359S246000, C359S245000, C362S019000, C362S011000

Reexamination Certificate

active

06937377

ABSTRACT:
An illumination system is disclosed, which includes a first light source and a second light source configured to emit light when the first light source is not emitting light. A polarizing element accepts light from the first and second light sources. The polarizing element emits, along a light path, light from the first light source with a first polarization orientation. The polarizing element emits, along the light path, light from the second light source with a second polarization orientation. A homogenizing element receives and homogenizes polarized light from the polarizing element. A polarization rotator receives light from the homogenizing element. The polarization rotator selectively rotates one of the first and second polarization orientations to ensure light emitted therefrom maintains a constant polarization orientation.

REFERENCES:
patent: 5059917 (1991-10-01), Stephens
patent: 5777789 (1998-07-01), Chiu et al.
patent: 2003/0128427 (2003-07-01), Kalmanash et al.

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