Multifocal zone plate

Details Multifocal zone plate Multifocal zone plate

1978-12-18

1980-07-01

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

350162ZP, 350211, G02B 308, G02B 518, G02C 704

Patent

active

042103916

ABSTRACT:
A multifocal Fresnel lens construction suitable for use in optical systems with multifocal requirements. It is designed as a multifocal zone plate to allow an annular ring construction that isn't width limited by diffraction aberrations. This is accomplished by modifying the phase separating annular rings of a zone plate, with curved or inclined optical facets of varying refractive indices, which can then function as Fresnel rings corresponding to the different focal powers desired.

REFERENCES:
patent: 3004470 (1961-10-01), Ruhle
Ziegler, J. F., "Fabrication or Correction of Optical Lenses," IBM Tech. Dis. Bulletin, vol. 12, No. 10, Mar. 1970, pp. 1573-1575.

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