Method and apparatus for sorting coins utilizing coin-derived signals containing different harmonic components
US4971187A · kind A · utility
66Cited by
8References
12Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 29, 1988 |
| Grant date | Nov 20, 1990 |
| Priority date | — |
| Expiry date | Dec 29, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D5/02
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A coin to be judged is passed near an oscillation coil excited by an exciting signal containing a plurality of harmonic components, that is nonsinusoidal alternating current, and the coin is sorted in accordance with a signal produced by a receiving coil electromagnetically coupled with the oscillation coil and containing at least two harmonic components. The signal induced in the receiving coil may be a composite signal of at least two harmonic components. This signal may consist of a first signal of a composite of at least two harmonic components and a second signal of a composite of at least two other harmonic components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.