The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 27, 2009
Filed:
Aug. 18, 2005
Christoph Gerard August Hoelen, Eindhoven, NL;
Johannes Petrus Maria Ansems, Eindhoven, NL;
Edwin Van Lier, Eindhoven, NL;
Christoph Gerard August Hoelen, Eindhoven, NL;
Johannes Petrus Maria Ansems, Eindhoven, NL;
Edwin Van Lier, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
The illumination system has a plurality of light emitters (R, G, B) and a light-collimator () for collimating light emitted by the light emitters. Light propagation in the light-collimator is based on total internal reflection (TIR) towards a light-exit window () of the light-collimator. At least one light sensor () for optical feedback is placed outside the light-collimator and is arranged to receive light emitted by the light emitters exclusively through reflection at the light-exit window of the light-collimator. Preferably, the light sensor is placed substantially coplanar with the light emitters. Preferably, a side wall () of the light-collimator is provided with a protruding portion () for guiding the light reflected at the light-exit window of the light-collimator towards the light sensor. Preferably, the illumination system is provided with a reflector (). Preferably, the illumination system comprises a holographic diffuser (). Accurate sensing of the color mixing of light emitted by the illumination system is obtained.