Bill examination device
US5201395A · kind A · utility
183Cited by
15References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1991 |
| Grant date | Apr 13, 1993 |
| Priority date | — |
| Expiry date | Sep 13, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/187
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
In a bill examination device in which a signal pattern obtained by scanning the bill with a photo-detector or a magnetic detector is compared with a reference for testing the authenticity, the signal is subjected to differentiation or removal of a direct-current component before the comparison. The effect of the differences or offsets of the detector or its associated circuit due to manufacturing variations, temperature change, or aging, and differences in the darkness of printing or smudge on the bill is reduced, and the reliability of the authenticity test is improved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.