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Projection type color liquid crystal optical apparatus

  • US 5,648,860 A
  • Filed: 02/18/1994
  • Issued: 07/15/1997
  • Est. Priority Date: 10/09/1992
  • Status: Expired due to Term
First Claim
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1. A projection type color liquid crystal optical apparatus, comprising:

  • a light source system which produces light along an optical axis;

    a color separating and synthesizing optical system comprising,two color separating and synthesizing means being angularly arranged in a horizontal plane at an angle in a range of 40°

    to 70°

    with respect to each other and each disposed at respective incident angles α

    1, α

    2 with respect to said optical axis, wherein α

    1 and α

    2 are in a range of 20°

    to 35°

    , said two color separating and synthesizing means each separating at least one color from said light to form respectively a first color light, a second color light, and a third color light;

    a light modulation system configured to modulate, reflect and condense, respectively, each of the first, second and third color lights, said light modulating system comprising three optical elements each of which comprises,a liquid crystal optical element configured to modulate incident light to produce a modulated light, said liquid crystal optical element comprising,a front substrate having a transparent front electrode,a back substrate having a back electrode, anda liquid crystal and solidified matrix composite layer disposed between said front substrate and said back substrate and comprising a nematic liquid crystal dispersed and held in a solidified matrix,a reflection layer configured to reflect said modulated light with an incident angle, γ

    , in a range of 1°

    to 20°

    , anda condenser lens configured to converge the modulated light reflected by said reflection layer,wherein said three optical elements respectively modulate, converge and output the first, second and third color lights; and

    a light projection optical system which projects the first, second, and third color lights in at least one of a look-up projection angle or a look-down projection angle with respect to said horizontal plane.

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