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11.发明授权公开(公告)号：US11675028B2
公开(公告)日：2023-06-13
申请号：US17971822
申请日：2022-10-24
Applicant: TDK Corporation
Inventor： Kenichi Takano , Tsuyoshi Umehara , Yuta Saito , Hiraku Hirabayashi
CPC classification number: G01R33/098 , G01R33/0017 , G01R33/091 , G01R33/093
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：US11493570B2
公开(公告)日：2022-11-08
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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公开(公告)号：US11486734B2
公开(公告)日：2022-11-01
申请号：US17384939
申请日：2021-07-26
Applicant: TDK CORPORATION
Inventor： Yongfu Cai , Hayato Miyashita , Tsuyoshi Umehara , Yuta Saito
IPC: G01D5/16
Abstract: A magnetic sensor system includes a magnetic field generator and a magnetic sensor. The magnetic sensor includes a plurality of MR elements. The plurality of MR elements are each configured so that a bias magnetic field in a second direction orthogonal to a first direction is applied to a free layer, and to change in resistance with a strength of a magnetic field component. A maximum strength of the magnetic field component applied to each of the MR elements is greater than or equal to 1.2 times the strength of a bias magnetic field.
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公开(公告)号：US11293950B2
公开(公告)日：2022-04-05
申请号：US15997986
申请日：2018-06-05
Applicant: TDK Corporation
Inventor： Yuta Saito , Kenichi Takano , Hiraku Hirabayashi
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：US11175357B2
公开(公告)日：2021-11-16
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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Patent Agency Ranking
公开(公告)号：US11002803B2
公开(公告)日：2021-05-11
申请号：US16414870
申请日：2019-05-17
Applicant: TDK CORPORATION
Inventor： Kenichi Takano , Hiraku Hirabayashi , Yuta Saito
Abstract: A magnetic field detection device of an embodiment of the disclosure includes: a first magnetic field detection element having a first resistance value increasing upon application of a first magnetic field in a first direction and decreasing upon application of a second magnetic field in a second direction; and a second magnetic field detection element having a second resistance value decreasing upon application of the first magnetic field and increasing upon application of the second magnetic field. The first and second magnetic field detection elements each include first and second magneto-resistive effect films coupled in series. The first magneto-resistive effect film has a first major-axis direction inclined at a first inclination angle relative to the first direction. The second magneto-resistive effect film has a second major-axis direction inclined at a second inclination angle relative to the first direction. The magnetic field detection device satisfies conditional expressions (1) and (2).
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17.发明授权公开(公告)号：US12298363B2
公开(公告)日：2025-05-13
申请号：US18610999
申请日：2024-03-20
Applicant: TDK Corporation
Inventor： Yuta Saito , Hiraku Hirabayashi , Yoshihiro Kudo
IPC: G01R33/09
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：US11579213B2
公开(公告)日：2023-02-14
申请号：US17205222
申请日：2021-03-18
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 applies a bias magnetic field to free layer 24. The film thickness of the magnet film is 15 nm or more and 50 nm or less. The 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：US11531071B2
公开(公告)日：2022-12-20
申请号：US17228048
申请日：2021-04-12
Applicant: TDK CORPORATION
Inventor： Kenichi Takano , Hiraku Hirabayashi , Yuta Saito
Abstract: A magnetic field detection device of an embodiment of the disclosure includes: a first magnetic field detection element having a first resistance value increasing upon application of a first magnetic field in a first direction and decreasing upon application of a second magnetic field in a second direction; and a second magnetic field detection element having a second resistance value decreasing upon application of the first magnetic field and increasing upon application of the second magnetic field. The first and second magnetic field detection elements each include first and second magneto-resistive effect films coupled in series. The first magneto-resistive effect film has a first major-axis direction inclined at a first inclination angle relative to the first direction. The second magneto-resistive effect film has a second major-axis direction inclined at a second inclination angle relative to the first direction. The magnetic field detection device satisfies conditional expressions (1) and (2).
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20.发明授权公开(公告)号：US11506733B2
公开(公告)日：2022-11-22
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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