Multicolour chromaticity sensor
US7388665B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 19, 2006 |
| Grant date | Jun 17, 2008 |
| Priority date | — |
| Expiry date | Jun 11, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/513
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention provides an optical sensor having one or more filter-photodetector pairs and feedback to monitor the intensity and chromaticity of the white light generated by an illumination system. According to the present invention, filter-photodetectors are configured into pairs thereof, wherein a first filter-photodetector of a pair is configured and arranged so as to be sensitive to a predetermined region of the electromagnetic spectrum, while a second filter-photodetector of the pair is configured and arranged to be sensitive to a substantially complementary region of the electromagnetic spectrum. The spectral responsivity of the first filter-photodetector and the second filter-photodetector overlap in a predetermined region of the electromagnetic spectrum. Furthermore, the spectral responsivity of the first filter-photodetector is configured to substantially monotonically increase with respect to wavelength within said predetermined region, while the spectral responsivity of the second filter-photodetector is configured to substantially monotonically decrease with respect to wavelength within said predetermined region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.