Apparatus for sensing optical characteristics of a banknote
US7034324B2 · kind B2 · utility
79Cited by
5References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 16, 2002 |
| Grant date | Apr 25, 2006 |
| Priority date | — |
| Expiry date | Dec 16, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/121
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The optical characteristics of a banknote are measured by using first and second sets of optical devices positioned on respective sides of the banknote path. Each device includes a transmitter and an adjacent pair of receivers, the receivers being capable of receiving light from the adjacent transmitter which has been diffusively reflected by the banknote, and each receiver also receiving light from the transmitter of the opposed device. Calibration is carried out by moving a reference body of predetermined reflectance and transmittance characteristics into the banknote path between the devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.