Patent · US Expired

Phase grating having an unprotected relief structure with a grating structure that causes destructive interference of reflections

US5696584A · kind A · utility

9Cited by

5References

5Claims

0Family size

Assignee

JOHANNES HEIDENHAIN GmbH · DE

Inventors

Andreas Franz · Ludwigsburg, DE
Walter Huber · Traunstein, DE

Key dates

Filing date	Jan 26, 1996
Grant date	Dec 9, 1997
Priority date	—
Expiry date	Jan 26, 2016

Classification

Technology area (CPC G)Physics
CPC primaryG02B5/1871
WIPO fieldOptics
WIPO sectorInstruments

Abstract

An uncovered unprotected phase grating includes a substrate which has a relief structure. The relief structure includes a high-refraction material so that even if soiled with impeding ambient media an adequate difference in the index of refraction exists and the diffraction effect is preserved.

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