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Image display apparatus

  • US 5,446,510 A
  • Filed: 10/24/1994
  • Issued: 08/29/1995
  • Est. Priority Date: 12/20/1989
  • Status: Expired due to Term
First Claim
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1. An image display apparatus comprising:

  • a radiation source;

    a generator for generating an image by modulating a polarized beam; and

    directing means for directing a beam from said radiation source to said generator;

    wherein said directing means comprises a conversion optical system for converting the beam from said radiation source into said polarized beam,wherein said conversion optical system includes a polarizing beam splitter for splitting the beam from said radiation source into a first beam and a second beam of mutually orthogonal polarization directions and an arrangement of a 1/4 wavelength plate and a mirror for changing the direction of polarization of said first beam to generate a third beam of a polarization direction the same as that of said second beam and for directing said third beam to said polarizing beam splitter,wherein said first beam is formed by reflecting one portion of the beam from said radiation source with a beam splitting surface of said polarizing beam splitter and said second beam is formed by transmitting an another portion of the beam from said radiation source through the beam splitting surface of said polarizing beam splitter, andwherein said conversion optical system generates said third beam without redirecting said first beam to said radiation source and directs said second and third beams to said generator.

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