TIR prism arrangement and optics for providing an...

Details TIR prism arrangement and optics for providing an... TIR prism arrangement and optics for providing an...

2005-04-19

2005-04-19

Dowling, William C. (Department: 2851)

Optics: image projectors

Prism in light path

C348S771000

Reexamination Certificate

active

06880935

ABSTRACT:
A lens system for providing undistorted illumination image onto a light receiving surface such as a DMD™ (digital micromirror device) light modulator with a TIR (total internal reflection) prism arrangement by supporting the receiving face of the TIR prism arrangement at an angle with support to the principal plane of a focusing lens. The angle is used to vary the air gap between the focusing lens and the TIR prism arrangement such that the total or reflective optical path through the air gap and the TIR prism arrangement is a constant.

REFERENCES:
patent: 5402184 (1995-03-01), O'Grady et al.
patent: 5420655 (1995-05-01), Shimizu
patent: 6588908 (2003-07-01), Shimizu
patent: 6705734 (2004-03-01), Barazza

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