Patent ID: 6229645
Filing Date: 2001-05-08
Classification: G02B

Abstract:
A single-element polarization-selecting optical device, comprising:a) a Porro prism having a plurality of faces to include a face in the shape of a rectangle at an input end, four side faces, each of said four side faces orthogonal to any one of said four side faces that touches it, two faces orthogonal to each other at an apex and immediately adjacent said four faces such that said two faces orthogonal to each other and disposed opposite said input end form an A-shaped roof when viewed with respect to said four faces and said input face, and a face cut at an angle less than 90.degree. with respect to one side of said input end and disposed between said input end and said roof faces and immediately adjacent each of said four side faces; andb) a light polarizer, comprising a first thin film disposed on said face cut at an angle less than 90.degree., said first thin film comprising at least one layer.