07482567 is referenced by 39 patents and cites 18 patents.

The illumination system has a plurality of light emitters (R, G, B) and a light-collimator (1) 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 (4) of the light-collimator. At least one light sensor (8) 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 (35) of the light-collimator is provided with a protruding portion (9) 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 (12). Preferably, the illumination system comprises a holographic diffuser (17). Accurate sensing of the color mixing of light emitted by the illumination system is obtained.

Title
Optical feedback system with improved accuracy
Application Number
11/575515
Publication Number
7482567 (B2)
Application Date
August 18, 2005
Publication Date
January 27, 2009
Inventor
Edwin Van Lier
Eindhoven
NL
Johannes Petrus Maria Ansems
Eindhoven
NL
Christoph Gerard August Hoelen
Eindhoven
NL
Assignee
Koninklijke Philips Electronics
NL
IPC
H01J 3/14
G01J 1/32
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