The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 02, 1998
Filed:
Nov. 30, 1993
Applicant:
Inventors:
Tatiana Kosoburd, Jerusalem, IL;
Joseph Kedmi, Rehovot, IL;
Israel Grossinger, Rehovot, IL;
Uri Levy, Rehovot, IL;
Assignee:
Holo-Or Ltd., Rehovot, IL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02C / ; G02B / ; G02B / ; A61F / ;
U.S. Cl.
CPC ...
351161 ; 359569 ; 359571 ; 359575 ; 359665 ; 623-6 ;
Abstract
A tri-focal diffractive lens defining three foci, for viewing a band of light having a representative wavelength of .lambda., including a diffractive surface having a number of optical heights, h.sub.o, wherein the difference between the highest and the lowest optical heights is, modulo .lambda., substantially different from .lambda./2, wherein each of the foci receives at least 20% of light incident on the lens.