Title:
磁気センサ装置
Document Type and Number:
Japanese Patent JP5195963
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a magnetic sensor device highly sensitively detecting a magnetic pattern of a detection target in a non-contact state where the detection target having the magnetic pattern is away from a magneto-resistance effect element by minute distance.SOLUTION: A first magnet and a second magnet disposed to be in parallel to a conveyance path for conveying a detection target so as to have different magnetic poles opposing each other. Magnetic field intensity in a conveyance direction in the conveyance path and intensity change in an opposing direction of the first magnet and the second magnet together form gradient magnetic field including a zero-point. A magneto-resistance effect element is disposed between the conveyance path and the first magnet. The magneto-resistance effect element is provided in a weak magnetic field region in the vicinity of the zero-point in the magnetic field intensity of the gradient magnetic field in the conveyance direction. The detection target passes through a strong magnetic field region of the gradient magnetic field.
Inventors:
Tomokazu Ogome
Ryoji Shirahana
Toshiaki Shoji
Musashi Takeshi
Jin Inoue
Masaaki Okada
Ryoji Shirahana
Toshiaki Shoji
Musashi Takeshi
Jin Inoue
Masaaki Okada
Application Number:
JP2011109627A
Publication Date:
May 15, 2013
Filing Date:
May 16, 2011
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
G01R33/09; G01R33/02; H01L43/02; H01L43/08
Domestic Patent References:
| JP2001021631A | ||||
| JP2003060256A | ||||
| JP10019601A | ||||
| JP8178937A |
Foreign References:
| WO2010052797A1 |
Attorney, Agent or Firm:
Shogo Takahashi
Tadahiko Inaba
Kanako Murakami
Nakatsuru Kazutaka
Tadahiko Inaba
Kanako Murakami
Nakatsuru Kazutaka