Patent Number: 6,332,688

Title: Apparatus for uniformly illuminating a light valve

Abstract: A light energy efficient and low cost optical system for providing uniform illumination of a light valve. The light source is an extended source generally emitting a non-uniform spatial distribution of light power. The source light is focused into the entrance end of a light transmitting tunnel having reflecting interior wall surfaces and having cross sectional and length dimensions chosen to deliver, at the exit end of the tunnel, light which is substantially uniform is power distribution, over the surface area of the exit end, due multiple reflections from the tunnel walls. The exiting light is advantageously used to uniformly illuminate a light valve. The invention includes a combination of mirrors arranged about the source light to most effectively collect and direct the light.

Inventors: Magarill; Simon (Cincinnati, OH)

Assignee: Corning Incorporated

International Classification: G02B 17/00 (20060101); G02B 27/14 (20060101); G02B 27/09 (20060101); G02B 5/10 (20060101); G02B 5/02 (20060101); G02F 1/1335 (20060101); G02F 1/13 (20060101); G02B 6/42 (20060101); G02B 005/10 (); G02B 005/08 (); G02B 017/00 (); G02B 021/00 ()

Expiration Date: 12/25/2018