Title:
MAGNETIC SUBSTANCE DETECTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2014/156793
Kind Code:
A1
Abstract:
A magnetic substance detection device is provided with long magnets (12, 13) and ferromagnetic thin film magnetoresistance elements (23, 24). The magnets (12, 13) are provided to extend parallel to each other in a Y-axis direction, and are magnetized in opposite directions to each other in a Z-axis direction. The ferromagnetic thin film magnetoresistance elements (23, 24) are each formed to have a linear portion provided to extend approximately along the Y-axis direction on a plane of a substrate (22) disposed in a magnetic force line path between the magnets (12, 13), and change a resistance value in response to the change of a magnetic field in a direction orthogonal to the Y-axis direction within the plane of the substrate (22). A bias magnetic field in the direction orthogonal to the Y-axis direction within the plane of the substrate (22) is applied to the ferromagnetic thin film magnetoresistance elements (23, 24) by the magnets (12, 13), the bias magnetic field having a strength lower than the saturation magnetic field of the ferromagnetic thin film magnetoresistance elements (23, 24).
Inventors:
MOCHIZUKI SHINSUKE (JP)
Application Number:
PCT/JP2014/057219
Publication Date:
October 02, 2014
Filing Date:
March 18, 2014
Export Citation:
Assignee:
HAMAMATSU KOHDEN CO LTD (JP)
International Classes:
G01R33/09
Foreign References:
| JP2008145302A | 2008-06-26 | |||
| JP2008145379A | 2008-06-26 | |||
| JP2005030872A | 2005-02-03 | |||
| JP3105238U | 2004-10-21 | |||
| JPH0494581U | 1992-08-17 | |||
| JPS5187449U | 1976-07-13 | |||
| JPH11311542A | 1999-11-09 | |||
| JP2004038611A | 2004-02-05 |
Attorney, Agent or Firm:
PROSPEC PATENT FIRM (JP)
Patent business corporation Pros Peck patent firm (JP)
Patent business corporation Pros Peck patent firm (JP)
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