Patent · US Active

Filament, method of producing a filament and a light source including a filament

US10598316B2 · kind B2 · utility

1Cited by

3References

16Claims

0Family size

Assignee

Osram OLED GMBH · DE

Inventors

Markus Hofmann · Bad Abbach, DE
Thomas Schlereth · Pentling, DE
Michael Bestele · Lappersdorf, DE

Key dates

Filing date	Mar 17, 2017
Grant date	Mar 24, 2020
Priority date	—
Expiry date	Mar 17, 2037

Classification

Technology area (CPC H)Electricity
CPC primaryH10H20/8513
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A filament includes a radiation-transmissive substrate, a plurality of light emitting diodes and a converter layer, wherein the substrate has an upper side and a lower side facing away from the upper side, and the LEDs are arranged on the upper side of the substrate, the converter layer covers the LEDs, the upper side and the lower side of the substrate, and the converter layer has a first sublayer on the upper side and a second sublayer on the lower side, and the converter layer is configured to obtain an improved radiation profile of the filament such that the converter layer has a varying vertical layer thickness along a lateral direction, and/or the first sublayer and the second sublayer differ from one another in their geometry and/or material composition.

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