Patent ID: 6829090
Filing Date: 2004-12-07
Classification: G02B

Abstract:
A prism for transmitting or reflecting incident light depending on polarized light components thereof, comprising:a substantially grid-shaped diffraction grid, formed of metal; a pair of diffraction grid substrates sandwiching said diffraction grid in-between; a pair of adhesive layers, each adhesive layer of said pair of adhesive layers coupled to each substrate of said pair of diffraction grid substrates; and a pair of block members, each block member of said pair of block members coupled to said each adhesive layer, each block member configured with a plurality of substantially equally-spaced flat plate members alternately layered with adhesive layers for optically coupling said each block member with substantially reduced optical distortion than when configured with a single transparent component, said each block member having a surface to output the polarized light transmitted or reflected from said substantially grid shaped diffraction arid and passing through said plurality of flat plate members, wherein a medium having a refractive index approximately equivalent to that of said pair of block members is charged in a gap defined between said substantially grid-shaped diffraction grid and said pair of diffraction grid substrates.