Magnetic encoder having a stable output property with unsaturated magnetic sensor
US7400137B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 6, 2007 |
| Grant date | Jul 15, 2008 |
| Priority date | — |
| Expiry date | Aug 6, 2027 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB82Y25/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention provides a magnetic sensor suitable for high resolution and having high reliability by achieving stable output even at the occurrence of variations in a gap between a magnetic medium and the magnetic sensor, and a magnetic encoder using the magnetic sensor. The present invention uses a magnetoresistive element having magnetoresistive properties that satisfy the inequation, H10−50<H50−90, where H10−50 represents a magnetic field required for a resistance change from ΔR×10% to ΔR×50% with respect to a maximum amount of resistance change ΔR on a magnetoresitance effect curve, and H50−90 represents a magnetic field required for a resistance change from ΔR×50% to ΔR×90%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.