Method and apparatus for paper material discrimination with two near-infrared lights
US6730911B2 · kind B2 · utility
2Cited by
9References
23Claims
0Family size
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Key dates
| Filing date | Feb 14, 2002 |
| Grant date | May 4, 2004 |
| Priority date | — |
| Expiry date | Mar 5, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/1205
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A bill discriminating method of discriminating a paper material independent of a light/dense pattern caused by a difference of manufacturing steps and discriminating a paper material of paper without being influenced by humidity or deterioration of the paper material is provided, Two kinds of infrared rays of different kinds of wavelengths are irradiated onto the paper, thereby discriminating the paper material of the paper by using an absorbance difference between photometric values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.