US 7,320,531 B2
Multi-colored LED array with improved brightness profile and color uniformity
Robert S. West, Wixom, Mich. (US); Simon Kuppens, Geldrop (Netherlands); Charles Schrama, Waalre (Netherlands); Yourii Martynov, Eindhoven (Netherlands); Nicola Pfeffer, Eindhoven (Netherlands); and Huub Konijn, Huizen (Netherlands)
Assigned to Philips Lumileds Lighting Company, LLC, San Jose, Calif. (US)
Filed on May 07, 2004, as Appl. No. 10/841,132.
Application 10/841132 is a continuation in part of application No. 10/810169, filed on Mar. 25, 2004, granted, now 7,201,493.
Prior Publication US 2005/0001537 A1, Jan. 06, 2005
Int. Cl. F21V 9/00 (2006.01)
U.S. Cl. 362—231  [362/244; 362/308; 362/335; 362/252] 13 Claims
OG exemplary drawing
 
1. A light emitting device comprising:
a light mixing cavity having reflective side walls and a reflective bottom surface;
a plurality of red, green, and blue light emitting diodes (LEDs) arranged on or near the bottom surface, wherein each LED in the plurality of LED comprises an LED semiconductor chip with a side-emitting lens;
a first diffuser substantially parallel with the bottom surface and located above the LEDs a first distance; and
a substantially circular reflector directly over and spaced apart from each LED and side-emitting lens to reflect light back toward the bottom surface of the mixing cavity.