Magnetic encoder including plural magnetic pole lines having differing magnetic pitches and plural magnetic resistance effect elements
US5172057A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1990 |
| Grant date | Dec 15, 1992 |
| Priority date | — |
| Expiry date | Nov 30, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2497
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The magnetic encoder of the present invention includes a magnetic signal generating drum having plural magnetic pole lines respectively having different magnetization pitches. Magnetic signals are repeatedly generated from the plural magnetic pole lines. A magnetic sensor is provided which includes plural magnetic resistant effect elements for converting the respective magnetic signals generated from the plural magnetic pole lines into electric signals. The plural magnetic resistant effect elements respectively confront the plural magnetic pole lines and output electric signals of different pulse numbers in accordance with incident magnetic signals. The magnetic signals generated from the plural magnetic poles lines and incident on the magnetic resistant effect elements are less that an anisotropic magnetic field level of the respective magnetic resistant effect elements. As such, respective values and waveform shapes of signals output by each of the magnetic resistant effect elements is substantially the same.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.