Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1990-02-05
1991-05-21
Sugarman, Scott J.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
3501622, 35016221, 35016222, 351160R, 351176, 623 6, G02B 518, G02C 702, G02C 704, A61F 216
Patent
active
050169777
ABSTRACT:
The present invention relates to an optical lens for correcting astigmatism. It includes diffractive components whose outlines are delimited by conic section curves having non-degenerate centers. More precisely, in accordance with the invention, the lens includes adjacent diffractive components having hyperbolic or elliptical outlines with a periodicity in r.sup.2 in two mutually orthogonal directions x and y intersecting on the axis of the lens and coinciding with the main axes of the hyperbolas or of the ellipses, which are determined respectively by the equations: .DELTA.r.sub.x.sup.2 =2.lambda..vertline.f.sub.x .vertline.; and .DELTA.r.sub.y.sup.2 =2.lambda..vertline.f.sub.y .vertline.; in which: .DELTA.r.sub.x.sup.2 represents the periodicity in r.sup.2 along the x direction; .DELTA.r.sub.y.sup.2 represents the periodicity in r.sup.2 along the y direction; .lambda. represents the mean utilization wavelength; f.sub.x represents the desired focal length in the X direction; and f.sub.y represents the desired focal length in the Y direction.
REFERENCES:
patent: 3973850 (1976-08-01), Pouey
patent: 3985443 (1976-10-01), Danielsson et al.
patent: 4508436 (1985-04-01), Sitterle
patent: 4641934 (1987-02-01), Freeman
patent: 4642112 (1987-02-01), Freeman
patent: 4655565 (1987-04-01), Freeman
patent: 4932970 (1990-06-01), Portney
Baude Dominique
Chavel Pierre
Joyeux Denis
Taboury Jean
Essilor International-Compagnie Generale
Sugarman Scott J.
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