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公开(公告)号：US11892478B2
公开(公告)日：2024-02-06
申请号：US18111170
申请日：2023-02-17
Applicant: TDK CORPORATION
Inventor： Yuta Saito , Hiraku Hirabayashi
IPC: G01R15/20 , G01R31/364
CPC classification number: G01R15/207 , G01R15/205 , 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：US11789095B2
公开(公告)日：2023-10-17
申请号：US17847694
申请日：2022-06-23
Applicant: TDK Corporation
Inventor： Yuta Saito , Yoshihiro Kudo , Daisuke Miyauchi , Satoshi Abe
CPC classification number: G01R33/09 , G01R1/203 , G01R15/205
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：US11619659B2
公开(公告)日：2023-04-04
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：US10983181B2
公开(公告)日：2021-04-20
申请号：US16407234
申请日：2019-05-09
Applicant: TDK Corporation
Inventor： Kenichi Takano , Yuta Saito , Hiraku Hirabayashi
Abstract: A magnetic sensor whose output characteristic is less sensitive to the environmental temperature is provided. Magnetic sensor 1 has free layer 24 whose magnetization direction changes in response to an external magnetic field, pinned layer 22 whose magnetization direction is fixed with respect to the external magnetic field, spacer layer 23 that is located between pinned layer 22 and free layer 24 and that exhibits a magnetoresistance effect, and at least one magnet film 25 that is disposed on a lateral side of free layer 24 and that applies a bias magnetic field to free layer 24. A relationship of 0.7 ≤TC_HM/TC_FL≤1.05 is satisfied, where TC_HM is Curie temperature of the magnet film, and TC_FL is Curie temperature of the free layer.
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公开(公告)号：US11656301B2
公开(公告)日：2023-05-23
申请号：US17850391
申请日：2022-06-27
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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Patent Agency Ranking
公开(公告)号：US11181557B2
公开(公告)日：2021-11-23
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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公开(公告)号：US20210096194A1
公开(公告)日：2021-04-01
申请号：US16877801
申请日：2020-05-19
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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公开(公告)号：US20180356448A1
公开(公告)日：2018-12-13
申请号：US15997986
申请日：2018-06-05
Applicant: TDK Corporation
Inventor： Yuta Saito , Kenichi Takano , Hiraku Hirabayashi
CPC classification number: G01R15/205 , G01R19/0092 , G01R33/093
Abstract: A current sensor has: a magneto-resistive effect element which is arranged near a current line, to which a signal magnetic field is applied, the signal magnetic field being is induced by a current that flows in the current line, and which generates a magneto-resistive change in accordance with a change of the signal magnetic field; cancelling magnetic field generating means that is provided near the magneto-resistive effect element and that generates a cancelling magnetic field that cancels the signal magnetic field; a first soft magnetic body that is provided between the magneto-resistive effect element and the current line; and a pair of second soft magnetic bodies that are provided on both sides of the magneto-resistive effect element with regard to a magnetization detecting direction of the magneto-resistive effect element.
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公开(公告)号：US11965941B2
公开(公告)日：2024-04-23
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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公开(公告)号：US11892477B2
公开(公告)日：2024-02-06
申请号：US17686965
申请日：2022-03-04
Applicant: TDK Corporation
Inventor： Yuta Saito , Kenichi Takano , Hiraku Hirabayashi
CPC classification number: G01R15/205 , G01R19/0092 , G01R33/093
Abstract: A current sensor has: a magneto-resistive effect element which is arranged near a current line, to which a signal magnetic field is applied, the signal magnetic field being is induced by a current that flows in the current line, and which generates a magneto-resistive change in accordance with a change of the signal magnetic field; cancelling magnetic field generating means that is provided near the magneto-resistive effect element and that generates a cancelling magnetic field that cancels the signal magnetic field; a first soft magnetic body that is provided between the magneto-resistive effect element and the current line; and a pair of second soft magnetic bodies that are provided on both sides of the magneto-resistive effect element with regard to a magnetization detecting direction of the magneto-resistive effect element.
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