Color measurement instrument
US7092097B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 2006 |
| Grant date | Aug 15, 2006 |
| Priority date | — |
| Expiry date | Mar 8, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J3/524
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An LED-based color measurement instrument including an illumination system and a sensing system. The illumination system includes modulated LEDs and a temperature control system for regulating the temperature of the LEDs, thereby improving the consistency of their performance. The sensing system includes a photodiode, a transimpedance amplifier, and an integrator in the first stage to cancel the effect of ambient light on the output of the first stage. The sensing system also includes a lens system for imaging a target area of the target sample onto the photo sensor in a manner so that the product of the target area times the solid angle captured by the lens system is generally uniform over a selected range of distances, thereby reducing the positional sensitivity of the instrument with respect to the target sample.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.