Patent · US Expired

Light-guide body and process for its production

US7046903B2 · kind B2 · utility

5Cited by

6References

13Claims

0Family size

Assignee

ROEHM GMBH & CO. KG · DE

Inventors

Jann Schmidt · Darmstadt, DE
Guenther Ittmann · Groß-Umstadt, DE
Hans Lichtenstein · Reinheim, DE
Herbert Groothues · Frankfurt, DE

Key dates

Filing date	Oct 16, 2002
Grant date	May 16, 2006
Priority date	—
Expiry date	Jul 11, 2023

Classification

Technology area (CPC G)Physics
CPC primaryG02B1/04
WIPO fieldOptics
WIPO sectorInstruments

Abstract

The present invention relates to a light-guide body, which has at least one light-entry surface and at least one light-exit surface, the ratio of the light-exit surface area to the light-entry surface area being at least 4, comprising at least one light-guiding layer with a thickness of at least 2 mm, characterized in that the light-guiding layer comprises at least 60% by weight, expressed in terms of the weight of the light-guiding layer, of polymethyl methacrylate and from 0.001 to 0.08% by weight, expressed in terms of the weight of the light-guiding layer, of spherical barium sulphate particles with an average diameter in the range of from 0.3 to 20 μm.

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