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公开(公告)号：US20170350726A1
公开(公告)日：2017-12-07
申请号：US15602808
申请日：2017-05-23
Applicant: TDK CORPORATION
Inventor： Kazuya WATANABE , Hiraku HIRABAYASHI
CPC classification number: G01D5/1655 , G01D5/145 , G01D5/2448 , G01D18/00
Abstract: An angle sensor includes a detection signal generation unit for generating detection signals, and an angle detection unit for generating a detected angle value on the basis of the detection signals. The angle detection unit includes a signal conversion unit for performing a conversion operation, and an angle operation unit for performing an angle operation. The conversion operation is to convert the detection signals into first and second operation signals. The angle operation is to calculate the detected angle value using the first and second operation signals. The conversion operation includes an operation using a correction-term-containing function Which contains a correction term for reducing a first error or a second error occurring in the detected angle value. When the angle to be detected varies with a predetermined period, the first error varies with the predetermined period, whereas the second error varies with a period ½ the predetermined period.
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公开(公告)号：US20170314975A1
公开(公告)日：2017-11-02
申请号：US15455548
申请日：2017-03-10
Applicant: TDK CORPORATION
Inventor： Shinichirou MOCHIZUKI , Hiraku HIRABAYASHI , Tsuyoshi UMEHARA , Hiroshi NAGANUMA , Kazuya WATANABE
CPC classification number: G01D18/002 , G01D5/145 , G01D5/16 , G01D5/24476
Abstract: A correction apparatus for an angle sensor includes a correction unit for performing first correction processing on a first detection signal and performing second correction processing on a second detection signal. The first correction processing is processing for combining the first detection signal and a first correction value to generate a first corrected detection signal. The second correction processing is processing for combining the second detection signal and a second correction value to generate a second corrected detection signal. The first correction value has a first amplitude and varies with a first period. The second correction value has a second amplitude and varies with a second period. The first and second amplitudes are of the same value. The first and second periods are of the same value equal to ⅓ or ⅕ of the period of an ideal component of each of the first and second detection signals.
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公开(公告)号：US20250085362A1
公开(公告)日：2025-03-13
申请号：US18958211
申请日：2024-11-25
Applicant: TDK Corporation
Inventor： Norikazu OTA , Shinichirou MOCHIZUKI , Kazuya WATANABE , Hiraku HIRABAYASHI
Abstract: A magnetic sensor device includes a first detection circuit, a second detection circuit, and a processor. The processor is configured to execute first generation processing for generating a first initial detection value, second generation processing for generating a second initial detection value, first correction processing, second correction processing, and determination processing. The first correction processing is processing for correcting the first initial detection value and updating the first initial detection value. The second correction processing is processing for correcting the second initial detection value and updating the second initial detection value. The processor executes the determination processing after alternately executing the first correction processing and the second correction processing.
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公开(公告)号：US20240280652A1
公开(公告)日：2024-08-22
申请号：US18591026
申请日：2024-02-29
Applicant: TDK CORPORATION
Inventor： Norikazu OTA , Hiraku HIRABAYASHI , Kazuma YAMAWAKI , Shuhei MIYAZAKI , Kazuya WATANABE
CPC classification number: G01R33/098 , G01R33/0206 , G01R33/093
Abstract: A magnetic sensor device includes at least one magnetic sensor and a support. A center of gravity of an element layout area of the at least one magnetic sensor is deviated from a center of gravity of a reference plane of the support. The at least one magnetic sensor includes four auxiliary resistor sections constituted by a plurality of magnetoresistive elements. The element layout area includes first to fourth areas for laying out the four auxiliary resistor sections, respectively. Two of the first to fourth areas are arranged so that at least parts of the respective two areas sandwich a reference axis therebetween, and other two of the first to fourth areas are arranged so that at least parts of the respective other two areas sandwich the reference axis therebetween.
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公开(公告)号：US20240027545A1
公开(公告)日：2024-01-25
申请号：US18376958
申请日：2023-10-05
Applicant: TDK CORPORATION
Inventor： Masaki NAGATA , Kazuya WATANABE , Keisuke UCHIDA , Kohei HONMA , Hiraku HIRABAYASHI
CPC classification number: G01R33/0005 , G01R33/0206
Abstract: Provided is a magnetic field detection device that includes a first and second soft magnetic bodies, and a magnetic detector. The first and second soft magnetic bodies extend along a first plane and are disposed in confronted relation in a third direction. The first plane includes both a first direction and a second direction orthogonal to the first direction. The third direction is orthogonal to both the first and second directions. The magnetic detector is provided between the first and second soft magnetic bodies in the third direction.
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Patent Agency Ranking
公开(公告)号：US20230280420A1
公开(公告)日：2023-09-07
申请号：US18197913
申请日：2023-05-16
Applicant: TDK CORPORATION
Inventor： Norikazu OTA , Hiraku HIRABAYASHI , Kazuma YAMAWAKI , Shuhei MIYAZAKI , Kazuya WATANABE
CPC classification number: G01R33/098 , G01R33/0206 , G01R33/093
Abstract: A magnetic sensor device includes at least one magnetic sensor and a support. A center of gravity of an element layout area of the at least one magnetic sensor is deviated from a center of gravity of a reference plane of the support. The at least one magnetic sensor includes four resistor sections constituted by a plurality of magnetoresistive elements. Magnetization of a free layer in each of two of the resistor sections includes a component in a third magnetization direction. The magnetization of a free layer in each of the other two resistor sections includes a component in a fourth magnetization direction opposite to the third magnetization direction.
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公开(公告)号：US20230089851A1
公开(公告)日：2023-03-23
申请号：US17947243
申请日：2022-09-19
Applicant: TDK CORPORATION
Inventor： Kazuya WATANABE , Kenzo MAKINO
Abstract: A magnetic sensor includes a substrate including a top surface, an insulating layer including an inclined surface, and a magnetic detection element disposed on the inclined surface. The magnetic detection element includes a first side surface and a second side surface. The first side surface is located at a position forward in a first direction that is one direction along the inclined surface. The second side surface is located at a position forward in a second direction that is another direction along the inclined surface. The magnetic detection element includes a first non-constant portion in which a gap between an upper end of the first side surface and an upper end of the second side surface becomes smaller along the longitudinal direction of the magnetic detection element.
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公开(公告)号：US20220282996A1
公开(公告)日：2022-09-08
申请号：US17825715
申请日：2022-05-26
Applicant: TDK Corporation
Inventor： Masaki NAGATA , Kazuya WATANABE , Hiraku HIRABAYASHI
Abstract: A rotational angle detection apparatus is provided with a magnet disposed so as to be rotatable integrally with an axis of rotation, having a substantially circular shape when viewed along the axis of rotation, and including a magnetization vector component in a direction orthogonal to the axis of rotation; a magnetic sensor that outputs a sensor signal on the basis of change in a magnetic field accompanying rotation of the magnet; and a rotational angle detector that detects a rotational angle of the rotating body on the basis of the sensor signal output by the magnetic sensor; wherein the magnet has a curved inclined surface with a concave shape along the axis of rotation from a prescribed position on the outer side in a radial direction toward the axis of rotation, and when a circular virtual plane orthogonal to the axis of rotation and centered at the axis of rotation is established at a position opposed to the curved inclined surface, the magnetic sensor is disposed at a position at which the amplitudes of a magnetic field intensity Hr in a radial direction and a magnetic field intensity Hθ in a circumferential direction on the virtual plane are substantially the same, and the magnetic field intensities Hr and Hθ in the radial direction and/or the circumferential direction is output as the sensor signal.
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公开(公告)号：US20180172782A1
公开(公告)日：2018-06-21
申请号：US15714093
申请日：2017-09-25
Applicant: TDK CORPORATION
Inventor： Masaki NAGATA , Kazuya WATANABE , Keisuke UCHIDA , Kohei HONMA , Hiraku HIRABAYASHI
CPC classification number: G01R33/091 , G01R33/0206 , G01R33/093
Abstract: A magnetic field detection device includes a first soft magnetic body, a second soft magnetic body, and a magnetism detection element. The first soft magnetic body extends to have a first length in a first direction, and has a first width, smaller than the first length, in a second direction. The second direction is substantially orthogonal to the first direction. The second soft magnetic body is disposed to be spaced apart from and face the first soft magnetic body in the first direction, extends to have a second length in the first direction, and has a second width, smaller than the second length, in the second direction. The magnetism detection element is disposed, in the first direction, between the first and second soft magnetic bodies, and extends to have a third length in the first direction and a third width, larger than the third length, in the second direction.
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公开(公告)号：US20180164127A1
公开(公告)日：2018-06-14
申请号：US15805666
申请日：2017-11-07
Applicant: TDK CORPORATION
Inventor： Kenkichi ANAGAWA , Shinichirou MOCHIZUKI , Hiraku HIRABAYASHI , Kazuya WATANABE
IPC: G01D5/12
Abstract: An angle sensor includes a plurality of composite magnetic field information generation units and an angle computing unit. The plurality of composite magnetic field information generation units detect, at a plurality of detection positions, a composite magnetic field of a magnetic field to be detected and a noise magnetic field other than the magnetic field to be detected, and thereby generate a plurality of pieces of composite magnetic field information including information on at least the direction, out of the direction and the strength, of the composite magnetic field. At each of the plurality of detection positions, the magnetic field to be detected varies in direction according to an angle to be detected. The angle computing unit generates a detected angle value using the method of least squares on the basis of the plurality of pieces of composite magnetic field information.
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