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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：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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Patent Agency Ranking
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：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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公开(公告)号：US20230118663A1
公开(公告)日：2023-04-20
申请号：US17966061
申请日：2022-10-14
Applicant: TDK Corporation
Inventor： Yuichiro YAMAJI , Tamon KASAJIMA , Taiju AKUSHICHI
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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7.发明申请公开(公告)号：US20170030742A1
公开(公告)日：2017-02-02
申请号：US15181904
申请日：2016-06-14
Applicant: TDK CORPORATION
Inventor： Shinichirou MOCHIZUKI , Hiraku HIRABAYASHI , Hiroshi NAGANUMA , Tsuyoshi UMEHARA , Yuichiro YAMAJI
IPC: G01D5/244
CPC classification number: G01D5/24476 , G01D5/145
Abstract: A correction apparatus for an angle sensor includes a correction information generator for generating correction information, and a correction processing unit for performing correction processing in the course of generation of a detected angle value by an angle detector. Details of the correction processing are determined on the basis of the correction information. The correction information generator includes an error estimate generation unit and a correction information determination unit. The error estimate generation unit generates, on the basis of a first signal and a second signal, an error estimate containing a variable component that varies depending on an ideal angle estimate. The correction information determination unit determines the correction information on the basis of the error estimate.
Abstract translation: 一种用于角度传感器的校正装置包括用于产生校正信息的校正信息发生器和用于通过角度检测器产生检测角度值的过程中执行校正处理的校正处理单元。 基于校正信息确定校正处理的细节。 校正信息发生器包括误差估计生成单元和校正信息确定单元。 误差估计生成单元基于第一信号和第二信号生成包含根据理想角度估计而变化的可变分量的误差估计。 校正信息确定单元基于误差估计来确定校正信息。
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