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Rear projection screen

  • US 4,573,764 A
  • Filed: 12/30/1983
  • Issued: 03/04/1986
  • Est. Priority Date: 12/30/1983
  • Status: Expired due to Term
First Claim
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1. A lenticular lens comprising a base portion, a first side portion, a second side portion, and a tip portion opposite said base portion;

  • said first side portion having an average slope of between approximately 70° and

    85°

    with respect to said base portion;

    said second side portion having an average slope of between approximately 70° and

    85°

    with respect to said base portion;

    said first average slope and said second average slope being selected so that said first side portion and said second side portion are substantially internally reflective;

    said tip portion being contiguous with both said first side portion and second side portion, said tip portion comprising two convex cylindrical portions of equal radii and a central concave cylindrical portion and said tip portion being substantially refractive, wherein the ratio of the height of said lens to the width of said base portion is greater than 3;

    2 and the ratio of the width of said base portion to the width of said tip portion is greater than 2;

    1.

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