TIR prism arrangement and optics for providing an undistorted illumination image

摘要

A lens system for providing undistorted illumination image onto a light receiving surface such as a DMD(TM) (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.