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公开(公告)号：US20240230798A1
公开(公告)日：2024-07-11
申请号：US18610999
申请日：2024-03-20
Applicant: TDK Corporation
Inventor： Yuta SAITO , Hiraku HIRABAYASHI , Yoshihiro KUDO
IPC: G01R33/09
CPC classification number: G01R33/093 , G01R33/098
Abstract: A magnetic sensor includes a magnetic sensor chip 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.
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2.发明申请公开(公告)号：US20220065956A1
公开(公告)日：2022-03-03
申请号：US17350558
申请日：2021-06-17
Applicant: TDK Corporation
Inventor： Kenichi TAKANO , Tsuyoshi UMEHARA , Yuta SAITO , Hiraku HIRABAYASHI
Abstract: A magnetic sensor comprises a magnetoresistive effect element including a first side surface and a second side surface facing in opposite directions along a first axis and a first end surface and a second end surface facing in opposite directions along a second axis substantially orthogonal to the first axis. The sensor has a sensitivity axis extending in a direction of the first axis, a first yoke unit provided adjacent to the first side surface of the magnetoresistive effect element, and a first bias magnetic field generation unit provided adjacent to the first end surface of the magnetoresistive effect element. The first bias magnetic field generation unit is provided to be capable of applying a bias magnetic field on the magnetoresistive effect element and the first yoke unit.
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公开(公告)号：US20220283201A1
公开(公告)日：2022-09-08
申请号：US17537737
申请日：2021-11-30
Applicant: TDK CORPORATION
Inventor： Yuta SAITO , Hiraku HIRABAYASHI
IPC: G01R15/20 , G01R31/364
Abstract: A magnetic sensor device includes a first detection circuit that generates a first detection signal, a coil through which a feedback current is passed to generate a cancellation magnetic field, a second detection circuit that generates a second detection signal having a correspondence with a value of the feedback current, and a control circuit that controls the feedback current. In a closed-loop operation, the control circuit controls the feedback current so that the first detection signal has a constant value. In an open-loop operation, the control circuit maintains the feedback current at a constant value.
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公开(公告)号：US20210239774A1
公开(公告)日：2021-08-05
申请号：US17155307
申请日：2021-01-22
Applicant: TDK Corporation
Inventor： Yuta SAITO , Yoshihiro KUDO , Daisuke MIYAUCHI , Satoshi ABE
Abstract: The current sensor comprises: a magnetic detecting device that is arranged in the vicinity of a conductor, to which a magnetic field to be measured induced by a current flowing through the conductor is applied, and that changes an electrical resistance in response to a change in the magnetic field to be measured; two coils that generate a canceling magnetic field to cancel the magnetic field to be measured and that are arranged in the vicinity of the magnetic detecting device; a shunt resistor, that is connected in series between the two coils, for detecting a current flowing through the coils; a first differential amplifier that amplifies the output signal of the magnetic detecting device and that supplies the current to induce the canceling magnetic field to the coils; and a second differential amplifier that amplifies the voltage across the shunt resistor and that outputs a measured voltage proportional to the current flowing through the conductor.
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公开(公告)号：US20200300667A1
公开(公告)日：2020-09-24
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.
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Patent Agency Ranking
公开(公告)号：US20190086447A1
公开(公告)日：2019-03-21
申请号：US16101820
申请日：2018-08-13
Applicant: TDK CORPORATION
Inventor： Kenichi TAKANO , Yuta SAITO , Suguru WATANABE
Abstract: A current sensor includes a magnetic sensor device. The magnetic sensor device includes a magnetic sensor, a first magnetic layer, and a second magnetic layer in non-contact with the first magnetic layer. The magnetic sensor, the first magnetic layer, and the second magnetic layer are disposed across a virtual straight line and arranged in this order in a direction parallel to the virtual straight line. Different portions of magnetic flux generated by a current to be detected pass through the magnetic sensor, the first magnetic layer, and the second magnetic layer.
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7.发明申请公开(公告)号：US20190033347A1
公开(公告)日：2019-01-31
申请号：US16007426
申请日：2018-06-13
Applicant: TDK CORPORATION
Inventor： Kenichi TAKANO , Yuta SAITO , Hiraku HIRABAYASHI
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.
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公开(公告)号：US20230243899A1
公开(公告)日：2023-08-03
申请号：US18299475
申请日：2023-04-12
Applicant: TDK Corporation
Inventor： Yuta SAITO , Hiraku HIRABAYASHI , Yoshihiro KUDO
IPC: G01R33/09
CPC classification number: G01R33/093 , G01R33/098
Abstract: A magnetic sensor includes a magnetic sensor chip 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.
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9.发明申请公开(公告)号：US20230052013A1
公开(公告)日：2023-02-16
申请号：US17971822
申请日：2022-10-24
Applicant: TDK Corporation
Inventor： Kenichi TAKANO , Tsuyoshi UMEHARA , Yuta SAITO , Hiraku HIRABAYASHI
Abstract: A magnetic sensor comprises a magnetoresistive effect element including a first side surface and a second side surface facing in opposite directions along a first axis and a first end surface and a second end surface facing in opposite directions along a second axis substantially orthogonal to the first axis. The sensor has a sensitivity axis extending in a direction of the first axis, a first yoke unit provided adjacent to the first side surface of the magnetoresistive effect element, and a first bias magnetic field generation unit provided adjacent to the first end surface of the magnetoresistive effect element. The first bias magnetic field generation unit is provided to be capable of applying a bias magnetic field on the magnetoresistive effect element and the first yoke unit.
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公开(公告)号：US20210405133A1
公开(公告)日：2021-12-30
申请号：US17470031
申请日：2021-09-09
Applicant: TDK Corporation
Inventor： Yongfu CAI , Yuta SAITO
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.
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