Title:
EQUILIBRIUM TYPE MAGNETIC DETECTING DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/199519
Kind Code:
A1
Abstract:
Provided is an equilibrium type magnetic field detecting device which employs a common feedback coil and which is capable of switching to a measurement range and a measurement sensitivity corresponding to a change in a measured magnetic field (Ho). Magneto-resistive elements (11, 12, 13, 14) forming a first bridge circuit (10) oppose a first opposing region (33) of a feedback coil (30), and magneto-resistive elements (21, 22, 23, 24) forming a second bridge circuit (20) oppose a second opposing region (34). The first bridge circuit (10) is covered by a shield layer (41), but the second bridge circuit (20) is not covered by the shield layer. The measurement range is widened when a switching unit (62) switches to the first bridge circuit (10), and the detecting sensitivity can be increased by switching to the second bridge circuit (20).
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Inventors:
IDE YOSUKE (JP)
TAKAHASHI AKIRA (JP)
TAKAHASHI AKIRA (JP)
Application Number:
PCT/JP2017/007187
Publication Date:
November 23, 2017
Filing Date:
February 24, 2017
Export Citation:
Assignee:
ALPS ELECTRIC CO LTD (JP)
International Classes:
G01R33/09; G01R15/20; G01R33/02
Domestic Patent References:
| WO2012053296A1 | 2012-04-26 | |||
| WO2015156260A1 | 2015-10-15 | |||
| WO2017064921A1 | 2017-04-20 |
Foreign References:
| JP2004132790A | 2004-04-30 | |||
| JP2003519780A | 2003-06-24 | |||
| US6429640B1 | 2002-08-06 | |||
| JP2013053903A | 2013-03-21 |
Attorney, Agent or Firm:
NOZAKI, Teruo (JP)
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