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公开(公告)号：US20230288503A1
公开(公告)日：2023-09-14
申请号：US18040545
申请日：2021-08-03
Applicant: TDK Corporation
Inventor： Yuichiro YAMAJI , Osamu HARAKAWA , Makoto KAMENO
Abstract: A magnetic sensor includes a sensor chip mounted on a substrate such that an element formation surface thereof is perpendicular to the surface of the substrate and a magnetism collecting member mounted on the substrate such that a surface thereof faces the element formation surface. The magnetism collecting member has a surface positioned on the side opposite to the surface, and both the surfaces are flattened. This reduces a gap between the element formation surface and the magnetism collecting member and reduces variations among products. In addition, since the surface is also flattened, the magnetism collecting member has no directionality with respect to the sensor chip when it is mounted on the substrate, so that working efficiency during assembly can be improved.
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公开(公告)号：US20230204686A1
公开(公告)日：2023-06-29
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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公开(公告)号：US20230176145A1
公开(公告)日：2023-06-08
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
CPC classification number: 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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Patent Agency Ranking
公开(公告)号：US20250164584A1
公开(公告)日：2025-05-22
申请号：US18840684
申请日：2022-02-25
Applicant: TDK CORPORATION
Inventor： Ikuhito ONODERA , Osamu HARAKAWA
Abstract: To accurately perform positioning of an external magnetic body with respect to a sensor chip. After mounting of a sensor chip on a substrate, an external magnetic body is mounted on the substrate so as to overlap a magnetic layer as viewed in the Y-direction perpendicular to an element formation surface. Further, the position of the external magnetic body in the X-direction is adjusted with reference to alignment marks which are provided so as to be visually confirmable from an upper surface side of the sensor chip. Thus, in a magnetic sensor assembly, a desired positional relation can be established between the sensor chip and the external magnetic body.
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公开(公告)号：US20250116735A1
公开(公告)日：2025-04-10
申请号：US18833967
申请日：2022-01-31
Applicant: TDK Corporation
Inventor： Tamon KASAJIMA , Makoto KAMENO , Osamu HARAKAWA
Abstract: To reduce the influence of disturbance noise in a magnetic sensor provided with an external magnetic body around which a compensation coil is wound. A magnetic sensor includes an external magnetic body that collects a magnetic field to be detected in a magnetosensitive element and a compensation coil. The compensation coil includes a solenoid part wound around the external magnetic body and lead-out parts C1 and C2 that connect both ends of the solenoid part respectively to connection pins P1 and P2. The lead-out part C2 passes through the inner diameter area of the solenoid part to be connected to the connection pin P2. This makes the second lead-out part unlikely to act as an antenna, which can reduce the influence of disturbance noise.
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公开(公告)号：US20230296700A1
公开(公告)日：2023-09-21
申请号：US18040554
申请日：2021-08-03
Applicant: TDK Corporation
Inventor： Yuichiro YAMAJI , Osamu HARAKAWA , Makoto KAMENO
CPC classification number: G01R33/093 , G01R33/0052 , G01R33/091
Abstract: A magnetic sensor includes a sensor chip mounted on a substrate such that an element formation surface thereof is perpendicular to the substrate and a magnetism collecting member mounted on the substrate such that a surface thereof faces the substrate and a surface thereof faces the element formation surface. The arithmetic mean waviness Wa of the surface of the magnetism collecting member is 0.1 μm or less. When the arithmetic mean waviness Wa of the surface of the magnetism collecting member that faces the element formation surface is set to 0.1 μm or less, it is possible to significantly suppress a deterioration in detection sensitivity due to the presence of a gap between the element formation surface and the magnetism collecting member and to significantly reduce variations in detection sensitivity among products.
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公开(公告)号：US20250116733A1
公开(公告)日：2025-04-10
申请号：US18833968
申请日：2022-01-31
Applicant: TDK Corporation
Inventor： Yuichiro YAMAJI , Osamu HARAKAWA
Abstract: To prevent, in a magnetic sensor provided with an external magnetic body for collecting magnetic flux in a magnetism detection element, breakage of the external magnetic body. A magnetic sensor includes: a sensor chip having an element formation surface on which magnetism detection elements are formed, an external magnetic body having an end face positioned at the leading end of the longitudinal direction thereof and facing the element formation surface and side surfaces constituting the outer peripheral surface of the cross section thereof perpendicular to the longitudinal direction, and a protective resin at least partially covering the element formation surface and the side surfaces of the external magnetic body. This makes it possible to prevent breakage of the sensor chip and external magnetic body upon application of an external shock.
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公开(公告)号：US20230037194A1
公开(公告)日：2023-02-02
申请号：US17788606
申请日：2020-12-04
Applicant: TDK Corporation
Inventor： Koji KUROKI , Ikuhito ONODERA , Osamu HARAKAWA , Makoto KAMENO
Abstract: To increase, in a magnetic sensor having a magnetoresistive strip and a ferromagnetic film, a magnetic bias to be applied to a magnetoresistive element by magnetically coupling the magnetoresistive strip and ferromagnetic film. A magnetic sensor 1 includes a magnetoresistive strip S, an insulating film 13 that covers the magnetoresistive strip S, and ferromagnetic films M1 and M2 formed on the insulating film 13 and arranged in the x-direction through a magnetic gap G extending in the y-direction. The ferromagnetic films M1 and M2 overlap a plurality of hard magnetic members H through the insulating film 13. This allows two adjacent hard magnetic members H to be magnetically coupled through the ferromagnetic films M1 and M2. This makes it possible to increase the magnetic bias to be applied to a magnetoresistive element R without involving an increase in the size of the hard magnetic member H.
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