Patent · US Expired

Diffractive optical element

US5227915A · kind A · utility

57Cited by

7References

3Claims

0Family size

Assignee

Holo-Or Ltd. · IL

Inventors

Israel Grossinger · Karmei Yosef, IL
Joseph Kedmi · Jerusalem, IL

Key dates

Filing date	Jun 25, 1991
Grant date	Jul 13, 1993
Priority date	—
Expiry date	Jun 25, 2011

Classification

Technology area (CPC G)Physics
CPC primaryG02B5/1876
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A diffractive optical element and a method to produce same is disclosed. The optical element comprises a base and at least first and second phase zones wherein the first phase zone comprises a first multiplicity of steps and the second phase zone comprises a second multiplicity of steps and wherein the first multiplicity and the second multiplicity of steps are different. The method to produce the diffractive optical element of the present invention includes the step of defining a collection of masks for creating stepped phase zones wherein at least one of the collection of masks partially masks out at least one phase zone such that the at least one phase zone will be partially etched.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.