Title:
磁気センサ
Document Type and Number:
Japanese Patent JP6969142
Kind Code:
B2
Abstract:
A magnetic sensor suppressing bias magnetic field effects includes a magnetic detecting unit including first to fourth magneto-resistive elements to which a first magnetic field to be detected is applied, a differential amplifier into which the output voltage of the magnetic detecting unit is input, a first magnetic field generating conductor which, by a first feedback current output by the differential amplifier, applies to the magnetic detecting unit a second magnetic field to cancel the first magnetic field detected by the magnetic detecting unit, a bias magnetic field detector which detects a bias magnetic field applied to the magnetic detecting unit and outputs a second feedback current corresponding to the bias magnetic field, and a second magnetic field generating conductor which, by the second negative feedback current, applies to the magnetic detecting unit a correcting magnetic field to cancel the bias magnetic field detected by the magnetic detecting unit.
Inventors:
Kei Tanabe
Akihiro Unno
Akihiro Unno
Application Number:
JP2017079300A
Publication Date:
November 24, 2021
Filing Date:
April 12, 2017
Export Citation:
Assignee:
tdk Corporation
International Classes:
G01R33/09; G01R33/02
Domestic Patent References:
| JP2006184116A | ||||
| JP2005188947A | ||||
| JP2015219061A | ||||
| JP2003344515A |
Foreign References:
| WO2016080470A1 |
Attorney, Agent or Firm:
Takashi Murai
Hiromi Murai
Hiromi Murai