×

Projector

  • US 5,153,752 A
  • Filed: 02/20/1991
  • Issued: 10/06/1992
  • Est. Priority Date: 02/22/1990
  • Status: Expired due to Term
First Claim
Patent Images

1. A projector comprising:

  • a radiation source;

    an illuminating system having an arrangement of first and second polarizing beam splitters and a phase plate, dividing surfaces of both of said polarizing beam splitters being parallel with each other, the phase plate being arranged between both of said dividing surfaces, the first polarizing beam splitter reflecting an S-polarized beam of a white beam emitted from said radiation source and transmitting a P polarized beam of the white beam to be directed to the phase plate, the second polarizing beam splitter reflecting another S-polarized beam generated by the phase plate;

    a dichroic mirror system for receiving the S-polarized beams from said arrangement;

    a first optical modulator for generating a first reflected beam indicative of a first image by modulating the plane of polarization of a red component of the S-polarized beams from the mirror system and reflecting said red component;

    a second optical modulator for generating a second reflected beam indicative of a second image by modulating the plane of polarization of a green component of the S-polarized beam from the mirror system and reflecting said green component;

    a third optical modulator for generating a third reflected beam indicative of a third image by modulating the plane of polarization of a blue component of the S-polarized beam from the mirror system and reflecting said blue component; and

    a projection optical system for receiving said first to third reflected beams through the mirror system and both of the dividing surfaces of said polarizing beam splitters and for projecting a color image by said first to third reflected beams, wherein said polarizing beam splitters are caused to act as an analyzer for said first to third reflected beams.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×