Multifocal optical device with spurious order suppression and me

Details Multifocal optical device with spurious order suppression and me Multifocal optical device with spurious order suppression and me

1990-07-27

1992-06-09

Sugerman, Scott J.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

264 18, 351177, 359565, 359571, 359574, 359575, 623 6, G02C 704, G02B 2744, A61F 216

Patent

active

051201208

ABSTRACT:
A multifocal optical device is provided for focusing light traveling parallel to an optical axis of the device. The multifocal optical device comprises a multifocal phase zone plate including at least two annular zones disposed substantially concentrically about the optical axis and spaced in a radial dimension from the optical axis in proportion to the square root of q, where q is an integer zone number; and an absorbing material disposed on a portion of ones of the annular zones for absorbing a portion of the light.

REFERENCES:
Genovesa et al., "Phase Plate Lens for a Multiple Image Lens System"; IBM Tech Disclosure Bulletin; vol. 8; No. 12; May 1966, pp. 1796, 1797.
H. Kyuragi et al., "High-Order Suppressed Phase Zone Plates", Applied Optics, vol. 24, No. 8, Apr. 1985.
P. R. King, "The Design of Diffractive Surface Relief Lenses with More Than One Focus", Acta Polytech. Scand, Proc. of Image Sci., 1985.

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