Patent ID: 6476944
Filing Date: 2002-11-05
Classification: G02B

Abstract:
Image-forming apparatus, comprising:a) a reflection-type polychromatic, single film holographic analog of a spherical mirror for producing a collimated beam of light; b) a first polarizer disposed on a side of said holographic analog corresponding to a convex side of said mirror; c) a first quarter-wave plate disposed on a side of said holographic analog corresponding to a concave side of said mirror; d) a plane beam-splitting mirror disposed on a side of said first quarter-wave plate remote from said analog; e) a second quarter-wave plate disposed on a side of said plane beam-splitting mirror remote from said first quarter-wave plate; f) a second polarizer on a side of said second quarter-wave plate remote from said beam-splitting mirror, said first and second quarter-wave plates having fast axes oriented with respect to each other at a first substantially integral multiple of 90Â°, and said second polarizer having a direction of polarization oriented substantially at an odd integral multiple of 45Â° to a fast axis of said second quarter-wave plate; and wherein all the elements (a) through (f) are enclosed between two end plates of clear glass.