Title:
MAGNETIC SENSOR
Document Type and Number:
Japanese Patent JP2018077149
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To improve the accuracy of output from a pair of bridge-connected GMR elements even when a magnetic sensor is not accurately arranged in the width direction of a magnetic substance.SOLUTION: The magnetic sensor comprises GMR elements 22a-22d of magnetic field intensity detection type that are constructed as being the same and bridge connected, and bias magnets 30A, 30B for applying a bias magnetic field to the GMR elements 22a-22d, the magnetic sensor detecting the rotation of a gearwheel 40 that is of a magnetic substance. The bias magnets 30A, 30B are provided in a plane facing the GMR elements 22a-22d by being extended in parallel with a prescribed distance therebetween. The center lines CL3A, CL3B of the bias magnets 30A, 30B respectively are inclined by a prescribed angle to a straight line CL2 linking the centers of the GMR elements 22a-22d. The bias magnetic field is applied to the GMR elements 22a-22d in only a direction orthogonal to the straight line and not applied in the direction of the straight line.SELECTED DRAWING: Figure 1
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Inventors:
OHASHI TOSHIYUKI
Application Number:
JP2016219499A
Publication Date:
May 17, 2018
Filing Date:
November 10, 2016
Export Citation:
Assignee:
HAMAMATSU KODEN KK
International Classes:
G01R33/09; G01D5/245; G01R33/02
Domestic Patent References:
| JP2014149268A | 2014-08-21 | |||
| JP2016176911A | 2016-10-06 | |||
| JPH074988A | 1995-01-10 | |||
| JP2000018967A | 2000-01-21 | |||
| JP2015105835A | 2015-06-08 |
Foreign References:
| WO2014111976A1 | 2014-07-24 | |||
| US20030057938A1 | 2003-03-27 |
Attorney, Agent or Firm:
Patent business corporation Prospec patent office