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Wide angle rear projection lenticular lens system

  • US 5,428,476 A
  • Filed: 04/07/1994
  • Issued: 06/27/1995
  • Est. Priority Date: 04/07/1994
  • Status: Expired due to Term
First Claim
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1. A wide angle lenticular lens system for single piece rear projection screens comprising a plurality of identical vertical lenticular lens and wherein:

  • each of said plurality of said lenticular lens is parallel;

    each of said plurality of said lenticular lens is composed of a single element lens; and

    a shape of each of said plurality of lenticular lens is defined by a hyperbolic function;

    
    
    space="preserve" listing-type="equation">(X.sup.n /A.sup.n)-(Y.sup.n /B.sup.n)=1wherein a ratio of B to A is chosen to optimize an asymptote angle of a side of each of said plurality of lenticular lens with respect to incoming light into the lenticular lens so that most of the light impinging on a side of each of said lenticular lens is internally reflected out through an end portion of said lenticular lens and n is chosen to optimize a curvature of said end portion of each of said lenticular lens based upon an index or refraction of a material from which the lenticular lens is made so that light internally reflected from said sides of said lenticular lens impinges on said curvature of said end portion at an angle less than a critical angle;

    whereby substantially all the light entering each of said plurality of lenticular lens exits through said end portion and a wide horizontal viewing half angle is provided.

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