Patent · US Active

LED filament comprising conversion layer

US10886258B2 · kind B2 · utility

0Cited by

18References

20Claims

0Family size

Assignee

Osram OLED GMBH · DE

Inventors

Reiner Windisch · Nittendorf, DE
Florian Bösl · Regensburg, DE
Andreas Dobner · Wenzenbach, DE
Matthias Sperl · Mintraching, DE

Key dates

Filing date	Nov 21, 2018
Grant date	Jan 5, 2021
Priority date	—
Expiry date	Nov 21, 2038

Classification

Technology area (CPC H)Electricity
CPC primaryH10H29/142
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

An LED filament includes semiconductor chips arranged on a top side of a radiation-transmissive carrier, and at least partly covered with a radiation-transmissive first layer, the first layer and an underside of the carrier are covered with a second layer, phosphor is provided in the second layer, the phosphor is configured to shift a wavelength of the radiation of the semiconductor chip, no phosphor or phosphor including less than 50% of the concentration of the phosphor of the second layer is provided in the first layer, the carrier is formed from a further first layer and a carrier layer having cutouts, the carrier layer is arranged on the further first layer, the semiconductor chips are arranged on the further first layer in the regional of the cutouts of the carrier layer, and the first layer and the further first layer are at least partially covered with the second layer.

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