Patent · US Active

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

US10837606B2 · kind B2 · utility

1Cited by

3References

20Claims

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	Feb 7, 2020
Grant date	Nov 17, 2020
Priority date	—
Expiry date	Feb 7, 2040

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 LEDs, and a converter layer, wherein the substrate has an upper side and a lower side facing away from the upper side, the LEDs being 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, the converter layer is configured to obtain an improved radiation profile of the filament, along a lateral direction, the converter layer has a continuously varying vertical layer thickness, the lateral direction is a lateral longitudinal direction parallel to a main extension surface of the substrate, and the substrate has a length expanding along the lateral longitudinal direction that is greater than a width of the substrate along a lateral transverse direction.

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