Patent · US Active

Optical layered composite having a coating thickness below a threshold and its application in augmented reality

US11789284B2 · kind B2 · utility

0Cited by

2References

13Claims

0Family size

Assignee

Schott AG · DE

Inventors

Jens Ulrich Thomas · Mainz, DE
Thorsten Damm · Nieder-Olm, DE
Frank-Thomas Lentes · Bingen, DE
Kurt Nattermann · Ockenheim, DE

Key dates

Filing date	Aug 1, 2019
Grant date	Oct 17, 2023
Priority date	—
Expiry date	Jan 14, 2041

Classification

Technology area (CPC G)Physics
CPC primaryG02B2027/0194
WIPO fieldOptics
WIPO sectorInstruments

Abstract

An optical layered composite includes: a substrate having a front face, a back face, a thickness ds between the front face and the back face and a refractive index ns; and a coating applied to the front face. The coating comprises one or more coating layers. For at least one wavelength λg in the range from 390 nm to 700 nm, the coating satisfies one of the following criterion: nc<ns; or nc>ns, and nc is a mean refractive index of the coating layers, weighted by thickness; do is a total thickness of the coating; thicknesses are determined in a direction perpendicular to the front face; and k=λg/4π.

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