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Title:
ELECTRIC CURRENT SENSOR
Document Type and Number:
WIPO Patent Application WO/2012/172946
Kind Code:
A1
Abstract:
The present invention removes the offset component of a bias magnetic field generated due to attachment error during die bonding, from an induced magnetic field that acts on a free magnetic layer, and inhibits reduction in the linearity of sensor output. This electric sensor (1) is provided with: a pair of magneto-resistance effect elements (21a, 21b) that has a free magnetic layer in which the direction of magnetization varies with respect to an external magnetic field, and that forms a half-bridge circuit on the same sensor chip (2); and a hard bias layer (22) for applying a bias magnetic field to the free magnetic layer, wherein the hard bias layer (22) imparts a bias magnetic field so as to be mutually opposite in direction with respect to the free magnetic layers of the pair of magneto-resistance effect elements (21a, 21b).

Inventors:
TAOKA TAKAHIRO (JP)
KOGURE TATSUYA (JP)
ICHINOHE KENJI (JP)
IDE YOSUKE (JP)
KAWASAKI HIDEAKI (JP)
Application Number:
PCT/JP2012/063215
Publication Date:
December 20, 2012
Filing Date:
May 23, 2012
Export Citation:
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Assignee:
ALPS GREEN DEVICES CO LTD (JP)
TAOKA TAKAHIRO (JP)
KOGURE TATSUYA (JP)
ICHINOHE KENJI (JP)
IDE YOSUKE (JP)
KAWASAKI HIDEAKI (JP)
International Classes:
G01R15/20; H01L43/08
Foreign References:
JP2005236134A2005-09-02
JPH07297464A1995-11-10
JP2006066821A2006-03-09
JP2008122083A2008-05-29
JPH08201492A1996-08-09
JPS54127346A1979-10-03
Attorney, Agent or Firm:
AOKI, Hiroyoshi et al. (JP)
Hiroyoshi Aoki (JP)
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Claims:



 
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