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Renticular lens, surface light source, and liquid crystal display apparatus

  • US 5,592,332 A
  • Filed: 12/27/1993
  • Issued: 01/07/1997
  • Est. Priority Date: 12/25/1992
  • Status: Expired due to Term
First Claim
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1. A lenticular lens, comprising:

  • a light transmitting substrate having one a first surface and a second surface opposite to said first surface; and

    a plurality of lens elements elongated on the first surface of said light transmitting substrate, having concave shaped cross sections, and defined in such a way that ridges thereof are aligned in parallel,wherein30°



    θ

    10%

    100° and

    R≦

    20%, where θ

    10% is a diffusing angle range with respect to normal of the first surface in the case that when light is entered from the second surface or first surface and transmitted from the first surface or second surface, the intensity of the light transmitted is equal to or more than 10% of the intensity of the light transmitted in a peak direction of a main lobe; and

    R is the ratio of side lobes to main lobe.

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