公开(公告)号：US11156478B2

公开(公告)日：2021-10-26

申请号：US16749313

申请日：2020-01-22

Applicant: TDK Corporation

Inventor： Kenichi Takano ,  Yuta Saito ,  Hiraku Hirabayashi

IPC: G01D5/16

Abstract: Magnetic sensor 1 has MR elements 11A to 14A that are connected to each other. MR elements 11A to 14A belongs either to group G1 in which electric resistance increases when the magnetization direction of each free layer 26 is rotated a predetermined angle in a same direction, or to group G2 in which the electric resistance decreases when the magnetization direction of each free layer 26 is rotated the predetermined angle in the same direction. A variation of an output of magnetic sensor 1 due to an increase of the electric resistance of the electric resistance elements of one group and a variation of the output of magnetic sensor 1 due to a decrease of the electric resistance of the electric resistance elements of another group are cancelled out.

公开(公告)号：US11143720B2

公开(公告)日：2021-10-12

申请号：US16877801

申请日：2020-05-19

Applicant: TDK Corporation

Inventor： Yongfu Cai ,  Yuta Saito

IPC: G01R33/09 ,  G01R15/20

Abstract: A magnetic sensor device includes a magnetic field converter that receives an input magnetic field input along a first direction and outputs an output magnetic field along a second direction, which is orthogonal to the first direction. A magnetic field detector is provided at a position where the output magnetic field can be applied. A magnetic shield that blocks an external magnetic field along the second direction, is provided. The magnetic field converter has a shape in which the length in a third direction, which is orthogonal to both the first direction and the second direction, is longer than the length in the second direction, when viewed along the first direction. The magnetic shield is provided at a position overlapping with the magnetic field converter and the magnetic field detector, when viewed along the first direction.

公开(公告)号：US20210149000A1

公开(公告)日：2021-05-20

申请号：US17094171

申请日：2020-11-10

Applicant: TDK Corporation

Inventor： Yuta Saito ,  Hiraku Hirabayashi ,  Yoshihiro Kudo

IPC: G01R33/09

Abstract: A magnetic sensor includes a magnetic sensor tip that includes a magnetoresistive effect element and a sealed part. The magnetoresistive effect element includes a free layer and a pinned layer. The sealed part has a first surface and a second surface, which is opposite the first surface. The shape of the sealed part in the plan view from the first surface side is substantially quadrilateral. The substantially quadrilateral shape has a first side and a second side, which are substantially parallel to each other. In the plan view, from the first surface side of the sealed part, the magnetization direction of the pinned layer, in a state in which the external magnetic field is not applied on the magnetoresistive effect element, is inclined with respect to an approximately straight line found through the least squares method using a plurality of points arbitrarily set on the first side.

公开(公告)号：US10859606B2

公开(公告)日：2020-12-08

申请号：US16007426

申请日：2018-06-13

Applicant: TDK CORPORATION

Inventor： Kenichi Takano ,  Yuta Saito ,  Hiraku Hirabayashi

IPC: G01R15/20 ,  G01R19/00 ,  G01R33/00 ,  G01R33/09 ,  G01R15/14 ,  G01R15/18

Abstract: An offset estimation unit determines an estimate of an offset of a detection value to be output from a magnetic sensor. The offset estimation unit includes an initial function storing unit, a function settlement unit, and an estimate determination unit. The initial function storing unit stores an initial function for determining the estimate according to a first variable and a second variable, with a reference offset as the first variable and temperature as the second variable, the reference offset being the offset at a reference temperature. The function settlement unit settles a value of the first variable of the initial function by the reference offset, and turns the initial function into an estimate determination function for determining the estimate according to a value of the second variable. The estimate determination unit determines the estimate by settling the value of the second variable of the estimate determination function by temperature information.