Coin discrimination apparatus
US5379876A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 28, 1993 |
| Grant date | Jan 10, 1995 |
| Priority date | — |
| Expiry date | Apr 28, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D5/08
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
In coin discrimination apparatus, a coin under test rolls past first and second inductive sensors (C1, C2) which produce first and second coin signals (x.sub.1, x.sub.2) in dependence upon the coin under test. The coin signals are compared with data defining first and second stored windows (W.sub.1, W.sub.2) to determine acceptability of the coin. In accordance with the invention the data for the first and second windows (W.sub.1, W.sub.2) are stored respectively for providing both a first and a second window width (W.sub.11, W.sub.12 ; W.sub.21, W.sub.22), wherein the first window width corresponds to the width of a distribution of coin signals associated with acceptable coins of a particular denomination, and the second window width corresponds to the width of said distribution but excludes therefrom a range of values corresponding to fraudulent coins, and a coin under test is deemed to be acceptable upon the coin signals falling either within a first or a second acceptance condition wherein, for the first acceptance condition, the value of the first coin signal fails within the first window width of the first window (W.sub.11), and the value of the second coin signal falls withi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.