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Prism optical element, image observation apparatus and image display apparatus

  • US 20040233551A1
  • Filed: 05/20/2004
  • Published: 11/25/2004
  • Est. Priority Date: 05/07/1997
  • Status: Abandoned Application
First Claim
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1. A prism optical element comprising a plurality of surfaces facing each other across a medium having a refractive index (n) larger than 1 (n>

  • 1), wherein said plurality of surfaces include a first surface having both a transmitting action through which light rays enter said prism optical element or exit therefrom and a reflecting action by which light rays are internally reflected in said prism optical element;

    a second surface disposed to face said first surface across said medium and having a reflecting action by which light rays are internally reflected in said prism optical element;

    a third surface disposed substantially close to said second surface to face said first surface across said medium and having a reflecting action by which light rays are internally reflected in said prism optical element; and

    a fourth surface having such a transmitting action that when said first surface has an action through which light rays enter said prism optical element, said fourth surface has an action through which light rays exit from said prism optical element, whereas, when said first surface has an action through which light rays exit from said prism optical element, said fourth surface has an action through which light rays enter said prism optical element, and wherein the following condition is satisfied;

    sin

    1
    (1/nd)≦

    θ

    r3

    60°





    (1) where nd is a refractive index for the spectral d-line of said medium, and θ

    r3 is an angle of internal reflection of an arbitrary light ray at said third surface.

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