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Visual display apparatus

  • US 5,659,430 A
  • Filed: 12/20/1994
  • Issued: 08/19/1997
  • Est. Priority Date: 12/21/1993
  • Status: Expired due to Term
First Claim
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1. A visual display apparatus comprising:

  • first image display means for displaying a first image; and

    a first ocular optical system for projecting said first image formed by said first image display means and for leading said first image to a first eye of an observer, said first ocular optical system comprising at least one lens including;

    a first semitransparent reflecting surface which has a first center of curvature substantially on an optical axis of said at least one lens,a concave surface directed toward said center of curvature,a second semitransparent reflecting surface which has a second center of curvature at approximately a same position with respect to said optical axis as said first center of curvature, anda single concentric optical system disposed between said first semitransparent reflecting surface and said second semitransparent reflecting surface, said single concentric optical system being formed of a medium having an index of refraction greater than 1.

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