Patent · US Expired

Lighting system

US6234648A · kind A · utility

583Cited by

3References

20Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Herbert Friedrich Borner · Hamburg, DE
Wolfgang Busselt · Roetgen, DE
Thomas Justel · Witten, DE
Hans Nikol · Aachen, DE
Cornelis Reinder Ronda · Aachen, DE
Gerard Harbers · Sunnyvale, US

Key dates

Filing date	Sep 24, 1999
Grant date	May 22, 2001
Priority date	—
Expiry date	Sep 24, 2019

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S362/80
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A lighting system includes at least two light-emitting diodes each emitting, in operation, visible light in a preselected wavelength range. A converter converts part of the visible light emitted by one of the diodes into visible light in a further wavelength range so as to optimize the color rendition of the lighting system. The diodes include a blue light-emitting diode and a red light-emitting diode. Further, the converter includes a luminescent material for converting a portion of the light emitted by the blue light-emitting diode into green light.

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