Title:
LIGHT RECYCLING ILLUMINATION SYSTEMS HAVING RESTRICTED ANGULAR OUTPUT
Document Type and Number:
WIPO Patent Application WO2006036587
Kind Code:
A3
Abstract:
This invention is an illumination system that incorporates a light emitting diode and a partially reflecting optical element. The light emitting diode emits internally generated light having a first angular range and reflects incident light with high reflectivity. The partially reflecting optical element transmits a first portion of the internally generated light with a second angular range, smaller than the first angular range, and reflects a second portion of the internally generated light back to the light emitting diode, where the second portion is reflected by the light emitting diode. The partially reflecting optical element can be a pyramid, an array of pyramids, a first and second orthogonal arrays of prisms or a bandpass filter. Utilizing a partially reflecting optical element and light recycling can increase the effective brightness and the output efficiency of the illumination system.
Inventors:
BEESON KARL (US)
ZIMMERMAN SCOTT (US)
ZIMMERMAN SCOTT (US)
Application Number:
PCT/US2005/033054
Publication Date:
July 06, 2006
Filing Date:
September 16, 2005
Export Citation:
Assignee:
GOLDENEYE INC (US)
BEESON KARL (US)
ZIMMERMAN SCOTT (US)
BEESON KARL (US)
ZIMMERMAN SCOTT (US)
International Classes:
F21V5/00; F21V13/04; F21V5/02
Foreign References:
| US5544019A | 1996-08-06 | |||
| US5813753A | 1998-09-29 | |||
| US6869206B2 | 2005-03-22 | |||
| US20010013924A1 | 2001-08-16 | |||
| US20040196667A1 | 2004-10-07 |
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