Optical system for projection display and a projection...

Details Optical system for projection display and a projection... Optical system for projection display and a projection...

2005-05-24

2005-05-24

Nguyen, Judy (Department: 2851)

Optics: image projectors

Composite projected image

Multicolor picture

C353S081000, C353S099000, C348S771000, C359S834000

Reexamination Certificate

active

06896373

ABSTRACT:
An optical system for enhancing the image contrast and shortening the back focal length of a projection display is disclosed, which includes a light source, a light path switching device, and a total internal reflection (TIR) prism set disposed between the light path switching device and the projection lens. The light path switching device has a first mode of operation for directing the light towards a projection lens and a second mode of operation for directing the light away from the projection lens. The TIR prism set includes a first prism, a second prism and a third prism; a first gap is formed between the first prism and the second prism, and a second gap is formed between the first prism and the third prism.

REFERENCES:
patent: 6454417 (2002-09-01), Takamoto et al.
patent: 6560048 (2003-05-01), Okamori et al.
patent: 6583940 (2003-06-01), Nishikawa et al.
patent: 20030142278 (2003-07-01), Yamamoto

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