Multifocal phase place

Details Multifocal phase place Multifocal phase place

1980-04-21

1982-07-06

Corbin, John K.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

350162ZP, 350444, 350452, 351168, G02B 308, G02B 1700, G02C 704, G02C 706

Patent

active

043380050

ABSTRACT:
A phase plate construction suitable for use in optical systems with multifocal requirements. It is designed as a phase plate in order to provide sharp and clear focii with bright images. This is accomplished by adjusting the Fresnel echelettes and the zone plate spacings, of the phase plate, such that the Fresnel lens focii coincide with particular zone plate focii.

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

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