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公开(公告)号：US20250052837A1
公开(公告)日：2025-02-13
申请号：US18793208
申请日：2024-08-02
Applicant: TDK Corporation
Inventor： Yuichiro YAMAJI , Tamon Kasajima , Masafumi Kami , Osamu Harakawa
Abstract: Disclosed herein is a magnetic field detection device that includes a support having first, second, and third cutouts; and first, second, and third magnetic sensors accommodated in the first, second, and third cutouts, respectively. The support has first and second surfaces extending in first and second directions, third and fourth surfaces extending in the first and third directions, and fifth and sixth surfaces extending in the second and third directions. The first cutout is formed in at least one of the first and fourth surfaces, the second cutout is formed in at least one of the second and fifth surfaces, and the third cutout is formed in at least one of the third and sixth surfaces. Magnetic sensing directions of the first, second, and third magnetic sensors are the first, second, and third directions, respectively.
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公开(公告)号：US09983273B2
公开(公告)日：2018-05-29
申请号：US14712374
申请日：2015-05-14
Applicant: TDK CORPORATION
Inventor： Akihiro Ogawa , Tamon Kasajima , Kei Tanabe
CPC classification number: G01R33/09 , G01R33/1253
Abstract: A magnetic field detecting sensor includes a bridge circuit which is connected to multiple magnetoresistive effect elements and is capable of outputting a differential voltage between specified connection points, a magnetic field generating conductor for providing the magnetoresistive effect elements with a magnetic field in a direction opposite to that of the detection magnetic field by disposing a magnetic body near the center of the bridge circuit, a differential operation circuit which the differential voltage is input in and makes a feedback current flow to the magnetic field generating conductor, wherein the feedback current generates the magnetic field in a direction opposite to that of the detection magnetic field in the magnetic field generating conductor, and a voltage converting circuit for outputting the feedback current as a voltage value. The magnetic field generating conductor and the magnetoresistive effect elements are formed in the same stacked body.
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公开(公告)号：US20190113544A1
公开(公告)日：2019-04-18
申请号：US16153432
申请日：2018-10-05
Applicant: TDK CORPORATION
Inventor： Takashi Osada , Takahiro Hamamura , Tamon Kasajima
Abstract: Disclosed herein is a magnetic sensor that includes a saturable magnetic member that receives magnetic flux flowing in a first axis direction, and a detection coil wound around the saturable magnetic member and having a coil axis aligned with a predetermine direction different from the first axis direction.
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公开(公告)号：US12117506B2
公开(公告)日：2024-10-15
申请号：US17927134
申请日：2021-05-10
Applicant: TDK Corporation
Inventor： Takato Fukui , Tamon Kasajima , Yuichiro Yamaji , Taiju Akushichi , Osamu Harakawa , Makoto Kameno
CPC classification number: G01R33/0041 , G01R33/091
Abstract: To reduce the number of components and simplify the circuit configuration in a magnetic field detection device capable of detecting a weak magnetic field without using a shield room. A magnetic field detection device includes a cancel coil wound around a winding core part of a bobbin, magnetic sensors fixed to mutually different positions of the bobbin, and a feedback circuit that makes a cancel current flow in the cancel coil according to an output signal from the magnetic sensor to cancel the environmental magnetic field in a cancel space. Since the cancel coil is used in common for the magnetic sensors, it is possible to reduce the number of components to be used and to simplify the circuit configuration.
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Patent Agency Ranking
公开(公告)号：US12066506B2
公开(公告)日：2024-08-20
申请号：US17778249
申请日：2020-07-30
Applicant: TDK Corporation
Inventor： Taiju Akushichi , Makoto Kameno , Tamon Kasajima
IPC: G01R33/025 , G01R33/09
CPC classification number: G01R33/025 , G01R33/09
Abstract: To provide a small-sized magnetic sensor capable of achieving closed-loop control. A magnetic sensor includes: a sensor chip mounted on a surface of a substrate such that an element formation surface is perpendicular to the surface of the substrate or inclined by a predetermined angle with respect thereto; an external magnetic member mounted on the surface of the substrate and collecting a magnetic field to be detected in a magnetosensitive element; and a compensating coil wound around the external magnetic member. The compensating coil is thus wound around the external magnetic member, so that it is possible to cancel a magnetic field to be applied to the magnetosensitive element and to prevent the external magnetic member from being magnetically saturated.
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公开(公告)号：US12188997B2
公开(公告)日：2025-01-07
申请号：US17928852
申请日：2021-05-27
Applicant: TDK Corporation
Inventor： Makoto Kameno , Taiju Akushichi , Takato Fukui , Yuichiro Yamaji , Osamu Harakawa , Tamon Kasajima
IPC: G01R33/025 , G01R33/09
Abstract: To facilitate a change in the number and layout of magnetic field detection devices to be arranged in an array. A magnetic field detection device includes a cancel coil wound around a bobbin, a cover member fixed to the bobbin and covering the cancel coil in a direction perpendicular to the axial direction of the cancel coil, and magnetic sensors fixed to the bobbin or cover member. The cover member has side surfaces and extending in the z-direction and positioned on mutually opposite sides. The side surfaces have first and second engagement portions, respectively, and the first engagement portion has a shape engageable with the shape of the second engagement portion. This makes it possible to arrange a desired number of the magnetic field detection devices.
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公开(公告)号：US12105164B2
公开(公告)日：2024-10-01
申请号：US17966061
申请日：2022-10-14
Applicant: TDK Corporation
Inventor： Yuichiro Yamaji , Tamon Kasajima , Taiju Akushichi
CPC classification number: G01R33/091 , G01R33/0094
Abstract: Disclosed herein is a magnetic sensor that includes a first magnetic field sensor that detects an environmental magnetic field to generate a first magnetic field signal, a second magnetic field sensor that detects a detection target magnetic field to generate a second magnetic field signal, a first filter that removes an AC component in a predetermined frequency band from the first magnetic field signal to extract a DC component, a first compensation coil that applies a first cancelling magnetic field to the second magnetic field sensor based on the DC component, a second compensation coil that applies a second cancelling magnetic field to the second magnetic field sensor based on the second magnetic field signal, and a second filter that removes an AC component in at least a predetermined frequency band from the second magnetic field signal.
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公开(公告)号：US10905011B2
公开(公告)日：2021-01-26
申请号：US16494809
申请日：2018-03-16
Applicant: TDK Corporation
Inventor： Masafumi Kami , Hiroshi Kobayashi , Tamon Kasajima
Abstract: A state detecting device which can be applied even in a severe environment. The state detecting device includes a chargeable all-solid-state battery, a piezoelectric element which supplies charging power to the all-solid-state battery, and an integrated circuit including various sensors which operate with electric power supplied from the all-solid-state battery. The all-solid-state battery, the piezoelectric element, and the integrated circuit are mounted on one surface of a flexible substrate. The flexible substrate is attached to a flexible object which is either an object to be measured or constitutes at least part of an inner surface of a space to be measured.
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公开(公告)号：US10101413B2
公开(公告)日：2018-10-16
申请号：US14528231
申请日：2014-10-30
Applicant: TDK CORPORATION
Inventor： Tamon Kasajima , Kei Tanabe , Akihiro Ogawa
Abstract: A magnetic field detection device includes: a first magnetic field generating part, including a first magnetic field generating conductor; a first magnetic field detection part, including a first magnetic field detection element and a first differential operation part, wherein a first output of the first magnetic field detection element corresponding to the environment magnetic field is inputted into the first differential operation part, and a first feedback current flows into the first magnetic field generating conductor, and thus the first magnetic field generating part provides the first magnetic field detection element with a first feedback current magnetic field, with a direction opposite to the environment magnetic field; a second magnetic field generating part, including a second magnetic field generating conductor, in which a second current corresponding to the first feedback current flows; and a second magnetic field detection part, including a second magnetic field detection element.
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