Title:
MAGNETIC SENSOR
Document Type and Number:
WIPO Patent Application WO/2004/061466
Kind Code:
A1
Abstract:
A magnetic sensor of magnetic impedance system the hysteresis of which is reduced with no need of the superposition of a magnetic bias. This magnetic sensor is characterized by comprising a magnetic sensing section consisting of an excitation winding wound around a magnetic core made of a ferromagnetic material, an integration circuit series-connected to the inductance value of this magnetic sensing section via a diode with a polarity causing the current to flow toward the magnetic sensing section, a discharging circuit for releasing the charge accumulated in this integration circuit by pulse drive via the diode and the magnetic sensing section, and a sensing circuit for outputting, as a magnetic sensing output, the average voltage of the integration circuit which varies with a change in magnetic impedance of the magnetic sensing section which fluctuates with a change in the external field.
Inventors:
SUMIGAMA MASAHIKO (JP)
Application Number:
PCT/JP2002/013676
Publication Date:
July 22, 2004
Filing Date:
December 26, 2002
Export Citation:
Assignee:
SUMIGAMA MASAHIKO (JP)
International Classes:
G01R33/02; (IPC1-7): G01R33/02
Domestic Patent References:
| WO1991013366A1 | 1991-09-05 |
Foreign References:
| JP2000329835A | 2000-11-30 |
Attorney, Agent or Firm:
Ishikawa, Hidetake (Higashi-yurigaoka 3-chome Asao-k, Kawasaki-shi Kanagawa, JP)
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