Patent · US Active

Grating comprising sub-gratings with light-diffusing patterns

US8547640B2 · kind B2 · utility

0Cited by

3References

15Claims

0Family size

Assignee

SAINT-GOBAIN GLASS FRANCE · FR

Inventors

Maud Sarrant-Foresti · Paris, FR
Guillaume Lecamp · Paris, FR

Key dates

Filing date	Oct 29, 2009
Grant date	Oct 1, 2013
Priority date	—
Expiry date	Jun 18, 2030

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF21S11/00
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A transparent substrate including at its surface a grating of parallel lines of patterns separated by zones with a refractive index different from that of the patterns, the grating diffusing light and including at least 4 sub-gratings, each sub-grating including plural blocks of identical patterns with a width, each block including 2 to 10 of the patterns. Centers of gravity of neighboring patterns inside a block are separated by a constant period, the distance between neighboring blocks vary in a non-monotonic manner when passing from one edge of the sub-grating to the other edge of the sub-grating.

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