Digital light processing projection system and projection...

Details Digital light processing projection system and projection... Digital light processing projection system and projection...

2005-10-04

2005-10-04

Mahoney, Christopher E. (Department: 2851)

Optics: image projectors

Composite projected image

Multicolor picture

C353S081000

Reexamination Certificate

active

06951394

ABSTRACT:
A digital light processing projection system includes an illuminating device, an optical-path-switching element, a projection device and a prism set. The prism set is arranged between the illuminating device, the optical-path-switching element and the projection device and has a plurality of prisms in which an air gap existing between any two adjacent prisms. According to the invention, a light beam output from the illuminating device directly passes through the prisms and air gaps before being received by the optical-path-switching element. Under a first state, a light beam reflected from the optical-path-switching element is totally reflected at an interface between one of the prisms and one of the air gaps before being received by the projection lens. Under a second state, a light beam reflected from the optical-path-switching element is totally internal reflected back and forth within a prism being adjacent to the optical-path-switching element and is absorbed by a light absorbing material.

REFERENCES:
patent: 6349006 (2002-02-01), Okamori et al.
patent: 6560048 (2003-05-01), Okamori et al.
patent: 6663243 (2003-12-01), Fielding et al.
patent: 6840634 (2005-01-01), Chang
patent: 2005/0018146 (2005-01-01), Chang et al.

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