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Title:
MAINTAINING STABLE OPTICAL OUTPUT OF SOLID STATE ILLUMINATION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2019/147763
Kind Code:
A3
Abstract:
A method is disclosed for maintaining a desired optical output in a solid state illumination device, where the device is configured to accommodate multiple light emitting diodes (LEDs) and to combine light from the LEDs to produce a single optical output. The method includes testing the LEDs before adding them into the device. The testing produces characterizing information that describes how one or more optical properties (e.g., optical power and/or peak wavelength) of the tested LED change with temperature. This characterizing information is stored in a computer-based memory of the device, and the tested LED is added (connected) into the device. Then, during operation, temperature sensors measure a temperature associated with each respective LED in the device, and electrical current to one or more of the LEDs can be adjusted based on the measured temperatures associated with each LED and its stored characterizing information.

Inventors:
SORENSEN, Erik (22001 Dumberry Road, Vaudreuil-Dorion, Quebec J7V 8P7, 8P7, CA)
MACDONALD, Douglas (22001 Dumberry Road, Vaudreuil-Dorion, Quebec J7V 8P7, 8P7, CA)
CONSTANTINOU, Paul (22001 Dumberry Road, Vaudreuil-Dorion, Quebec J7V 8P7, 8P7, CA)
WANG, Yong (22001 Dumberry Road, Vaudreuil-Dorion, Quebec J7V 8P7, 8P7, CA)
Application Number:
US2019/014890
Publication Date:
September 19, 2019
Filing Date:
January 24, 2019
Export Citation:
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Assignee:
EXCELITAS CANADA, INC. (22001 Dumberry Road, Vaudreuil-Dorion, Quebec J7V 8P7, 8P7, CA)
EXCELITAS TECHNOLOGIES CORP. (200 West Street, Waltham, MA, 02451, US)
International Classes:
G01R31/26; G01N21/64; G02B19/00; G02B21/00; H05B33/08
Domestic Patent References:
WO2004014110A12004-02-12
Foreign References:
US20090079360A12009-03-26
EP1346609B12005-08-10
US20070040512A12007-02-22
Attorney, Agent or Firm:
O'SULLIVAN, William P. (Sheehan Phinney Bass & Green PA, 1000 Elm Street 17th Floo, Manchester NH, 03101, US)
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