Industry Patents
Patent: 7482567
Optical Feedback System With Improved Accuracy
(Click image for PDF of full patent)
| Patent Number: |
7482567 |
| Title: |
Optical Feedback System With Improved Accuracy |
| Abstract: |
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.
|
| Country of Issue: |
US |
| First Named Inventor: |
Hoelen, Ansems, Lier |
| Assignee: |
Philips |
| Continuation or Divisional of: |
|
| International Classification: |
G01J 1/32 |
| US Classification: |
250/205 |
| Issue Date: |
01-27-2009 |
| Filing Date: |
08-18-2005 |
| Application : |
11/575515 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
7482567 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
7482567 at Google Patents |
1. The Google Patents and World Patent Family links will likely not work until a few weeks
after the patent has issued - they take a while to get new patents in their systems.
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