Magnetic head for banknote detection
US9721415B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 30, 2013 |
| Grant date | Aug 1, 2017 |
| Priority date | — |
| Expiry date | Dec 29, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C19/085
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A magnetic currency verification head may include a magnetoresistive sensor chip, and a magnetic bias unit disposed on the side of the magnetoresistive sensor chip away from the detection surface of the magnetic currency verification head, and separated from the magnetoresistive sensor chip; the magnetoresistive sensor chip comprises a gradiometric bridge circuit that includes magnetic sensor elements; the sensitive direction of the magnetic sensor elements is parallel to the detection surface of the magnetic currency verification head; and the magnetic bias unit has a recessed magnetic structure configured such that the magnetic field generated by the magnetic bias unit only has a small magnetic field component in the direction parallel to the detection surface, thereby enabling the magnetic sensor elements to operate in their linear range. As a result, the magnetic currency verification head has high sensitivity and signal-to-noise ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.