Magnetic detection device using an oscillator whose detection element is a magnetoresitance effective element
US5134371A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jan 18, 1990 |
| Grant date | Jul 28, 1992 |
| Priority date | — |
| Expiry date | Jan 18, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/09
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A magnetic detection device including at least one oscillator circuit having a magnetoresistance element which converts a change of magnetism detected into a digital signal and a comparator for comparing the digitalized oscillating frequency of the oscillator circuit with another digitalized oscillating frequency generated from another oscillating circuit by taking a ratio thereof or by detecting a phase difference between the pulse signals. Utilizing the magnetic detection device, the amount of change of magnetism can be stably detected with a high accuracy within a wide range of ambient usage temperatures. Also, a physical quantity detection device including the magnetic detection device which can detect any physical quantity with a high accuracy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.