Moving coin validation
US4664244A · kind A · utility
11Cited by
5References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 22, 1986 |
| Grant date | May 12, 1987 |
| Priority date | — |
| Expiry date | Apr 22, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D5/02
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method and apparatus for validating a moving coin by detecting an oscillating signal generated in coils connected in a tuned oscillating circuit. A property of the signal which varies linearly with coin displacement in one direction for a first period and varies linearly in an opposite direction with coin displacement for a second period is measured. From measurements made during the first and second periods a signal characteristic of the coin, and substantially independent of the coin's velocity is derived. The coin is validated by comparing this signal with stored reference values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.