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Collimating plate, lighting apparatus and liquid crystal display apparatus

  • US 20010019378A1
  • Filed: 02/14/2001
  • Published: 09/06/2001
  • Est. Priority Date: 02/14/2000
  • Status: Active Grant
First Claim
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1. A collimating plate comprising:

  • a lens substrate;

    a plurality of microlenses disposed on a surface of said lens substrate;

    a plurality of light entrance areas, each having a circular form a center of which is on an optical axis of each of said plurality of microlenses and set on another surface of the lens substrate reverse to said plurality of microlenses; and

    a light shield layer formed on another surface of said lens substrate reverse to said plurality of microlenses so as to cover other area than said plurality of light entrance areas, wherein when a refractive index of said lens substrate is represented by n;

    a thickness of said lens substrate by t;

    a diameter of each of said plurality of light entrance areas by R; and

    a size of each of said plurality of microlenses by Sr, the following formula (1);

    Sr≧

    2

    tan θ

    +R



    (1) (with the proviso that θ

    =sin

    1
    (1/n)) is satisfied.

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