Phase shift multifocal zone plate

Details Phase shift multifocal zone plate Phase shift multifocal zone plate

1979-12-17

1982-07-20

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

350162ZP, 350452, 351168, G02B 308, G02B 518, G02C 704

Patent

active

043402836

ABSTRACT:
A multifocal zone plate construction suitable for use in optical systems with multifocal requirements. It is designed as a phase shift multifocal zone plate to provide multiple focii with bright images. This is accomplished by adjusting the zone plate spacings such that some of the zone plate focii actually coincide with some of the multifocal Fresnel lens focii.

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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