Maintaining stable optical output of solid state illumination system
US11307241B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2019 |
| Grant date | Apr 19, 2022 |
| Priority date | — |
| Expiry date | Feb 9, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2201/12707
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.