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Projection lenses having reduced lateral color for use with pixelized panels

  • US 6,195,209 B1
  • Filed: 05/04/1999
  • Issued: 02/27/2001
  • Est. Priority Date: 05/04/1999
  • Status: Expired due to Term
First Claim
Patent Images

1. A projection lens for forming an image of an object which consists in order from its image end to its object end of:

  • (A) a first lens unit U1 having a negative power and comprising three lens elements EP, EN, and EN′

    , arranged in any order and having focal lengths fU1/P, fU1/N, and fU1/N′

    , V-values VU1/P, VU1/N, and VU1/N′

    , and Q-values QU1/P, QU1/N, and QU1/N′

    , respectively;

    (B) a second lens unit having a positive power; and

    (C) an optional field lens unit;

    wherein EN or EN′

    is made of glass and wherein;

    fU1/P>

    0, fU1/N<

    0, fU1/N′

    <

    0, VU1/N>

    VU1/P, VU1/N′

    >

    VU1/P, QU1/N>

    0, QU1/N>

    QU1/P, QU1/N>

    VU1/N, QU1/N′

    >

    0, and QU1/N>

    QU1/P.

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