Optical lens for correcting astigmatism

  • US 5,016,977 A
  • Filed: 02/05/1990
  • Issued: 05/21/1991
  • Est. Priority Date: 02/06/1989
  • Status: Expired due to Fees
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First Claim
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1. A lens for correcting astigmatism, including adjacent hyperbolic- or elliptical-outline diffractive components whose periodicity in two mutually orthogonal X and Y directions intersecting at the axis of the lens and coinciding with the main axes of the hyperbolas or the ellipses are respectively determined by the equations:

  • 
    
    space="preserve" listing-type="equation">Δ

    r.sub.x.sup.2 =2λ

    |f.sub.x |; and

    
    
    space="preserve" listing-type="equation">Δ

    r.sub.y.sup.2 =2λ

    |f.sub.y |;

    in which;

    Δ

    rx2 represents the periodicity in r2 along the X direction;

    Δ

    ry2 represents the periodicity in r2 along the Y direction;

    λ

    represents the means utilization wavelength;

    fx represents the desired focal length in the X direction; and

    fy represents the desired focal length in the Y direction.

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