Photoelectric color sensor for article sorting
US5021645A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 1989 |
| Grant date | Jun 4, 1991 |
| Priority date | — |
| Expiry date | Jul 11, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/9508
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for photoelectrically sensing the color of a target object includes two more light sources having different characteristic ranges of chromaticity and at least one photosensitive element which receives light from the light sources after it has reflected off of the target object. A logic circuit serves to serially energize the light sources and receive resultant sample signals from the photosensitive elements. The logic circuit then generates a resultant signal as a function of the various sample signals and compares the resultant signal with a predetermined reference standard. If the difference therebetween exceeds a tolerance limit, the control circuit will output a reject signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.