Industry Patents
Patent: 7234820
Illuminators Using Reflective Optics With Recycling and Color Mixing
(Click image for PDF of full patent)
| Patent Number: |
7234820 |
| Title: |
Illuminators Using Reflective Optics With Recycling and Color Mixing |
| Abstract: |
Various optical techniques are described for obtaining a specified light
output from an LED source. One technique uses a parabolic reflector
surrounding an LED or LED array to create a collimated beam, and the
light exit opening of the parabolic reflector is defined by a reflective
disc with an opening of the desired size. Any generated light that is
outside of the opening is reflected back into the parabolic reflector and
re-reflected until the light exits the opening. For mixing different
light colors from different LEDs or energized phosphors, a mixing tunnel
is used. The mixing tunnel includes angled dichroic mirrors or angled
polarizer mirrors that selectively reflect and pass selected colors or
polarizations of light to a single output port of the mixing tunnel.
Efficient and compact ways to energize phosphors are also described.
Other optical techniques are also described.
|
| Country of Issue: |
US |
| First Named Inventor: |
Harbers, Scheffel, Keuper, Holman |
| Assignee: |
Philips Lumileds |
| Continuation or Divisional of: |
|
| International Classification: |
G03B 21/26 |
| US Classification: |
353/94 |
| Issue Date: |
06-26-2007 |
| Filing Date: |
04-11-2005 |
| Application : |
11/104220 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
7234820 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
7234820 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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