Patent ID: 6246506
Filing Date: 2001-06-12
Classification: G02B,G02F,H04N

Abstract:
An optical projector, comprising:an optical source;a color separation system disposed on an optical path of an optical beam emitted from said optical source, said color separation system separating said optical beam into respective color optical beams;a plurality of light valves provided respectively in correspondence to said color optical beams, each of said light valves being disposed on an optical path of a corresponding color optical beam for applying a spatial modulation thereto, said light valve producing thereby a spatially modulated color optical beam;a plurality of polarization devices respectively provided on said optical paths of said color optical beams incident to said light valves, each of said polarization devices causing a polarization in said color optical beam passing therethrough, such that said color optical beam has a predetermined polarization plane; anda projecting optical system synthesizing a projection optical beam from said plurality of spatially modulated color optical beams and projecting said projection optical beam on a screen;at least one of said plurality of polarization devices including a reflection-type polarization element that has a transmission axis and passes a predetermined linear polarization component included in said color optical beam incident to said reflection-type polarization element and having a predetermined polarization plane coincident to said transmission axis, said reflection-type polarization element further reflecting other polarization components included in said color optical beam incident thereto,said reflection-type polarization element including a lens at a side to which said color optical beam impinges.