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Focusable, color corrected, high performance projection lens systems

  • US 6,141,154 A
  • Filed: 08/20/1998
  • Issued: 10/31/2000
  • Est. Priority Date: 08/22/1997
  • Status: Expired due to Fees
First Claim
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1. A projection lens system for use with a cathode ray tube, said lens system having an overall optical power Φ

  • 0 consisting in order from its long conjugate to its short conjugate of;

    (a) a first lens unit having an optical power Φ

    1 and consisting in order from the lens system'"'"'s long conjugate to its short conjugate of;

    a first lens subunit having an optical power Φ

    S1 ; and

    a second lens subunit having an optical power Φ

    S2 ;

    (b) a second lens unit having an optical power Φ

    2 ; and

    (c) a third lens unit which has an optical power Φ

    3, is associated with the cathode ray tube during use of the lens system, and provides correction to the field curvature of the lens system;

    wherein each of the first, second, and third lens units has at least one aspherical surface and wherein Φ

    1, Φ

    S1, Φ

    S2, Φ

    2, and Φ

    3 satisfy the following conditions;

    (i) Φ

    1 >

    0;

    (ii) Φ

    1

    0 <

    0.3;

    (iii) Φ

    S1 <

    0;

    (iv) |Φ

    S1 |/Φ

    0 >

    0.4;

    (v) Φ

    S2 >

    0;

    (vi) Φ

    S2

    0 >

    0.3;

    (vii) Φ

    2 >

    0;

    (viii) Φ

    2

    0 >

    0.4; and

    (ix) Φ

    3 <

    0.

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