Patents by Inventor Hiraku Hirabayashi
Hiraku Hirabayashi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20220187344Abstract: 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.Type: ApplicationFiled: March 4, 2022Publication date: June 16, 2022Inventors: Yuta SAITO, Kenichi TAKANO, HIRAKU HIRABAYASHI
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Patent number: 11360286Abstract: A magnetic sensor includes first to fourth resistors, a power supply port, a ground port, a first output port, and a second output port. The first resistor and the second resistor are located in a first region and connected in series via a first connection point connected to the first output port. The third resistor and the fourth resistor are located in a second region and connected in series via a second connection point connected to the second output port, at least a part of the second region being located at a position different from the first region in a direction parallel to an X direction. The first and second resistors are located between the third and fourth resistors in a direction parallel to a Y direction.Type: GrantFiled: March 9, 2021Date of Patent: June 14, 2022Assignee: TDK CORPORATIONInventors: Yongfu Cai, Hiraku Hirabayashi, Tsuyoshi Umehara
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Patent number: 11359908Abstract: A magnetic field generator generates a detection-target magnetic field related to an angle to be detected. An angle sensor includes a first and a second magnetic sensor and a processor. The first magnetic sensor detects, at a first detection position, a first applied magnetic field including the detection-target magnetic field, and generates first detection information having a correspondence with the angle to be detected. The second magnetic sensor detects, at a second detection position, a second applied magnetic field including the detection-target magnetic field, and generates second detection information having a correspondence with the angle to be detected. The processor generates an angle detection value by performing arithmetic processing using the first and second detection information. The ratio of a strength of the detection-target magnetic field at the second detection position to a strength of the detection-target magnetic field at the first detection position is 1.65 or more.Type: GrantFiled: July 31, 2019Date of Patent: June 14, 2022Assignee: TDK CORPORATIONInventors: Yongfu Cai, Hiraku Hirabayashi
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Patent number: 11353518Abstract: Provided is a magnetic field detection device that includes a first soft magnetic body and a magnetic detector. The first soft magnetic body includes a first plate and a first protrusion. The first plate includes a first surface including a first outer edge. The first protrusion is provided at a first arrangement position in the first surface and includes a first tip on opposite side to the first surface. The first arrangement position is set back from the first outer edge. The magnetic detector is provided in the vicinity of the first tip.Type: GrantFiled: June 23, 2020Date of Patent: June 7, 2022Assignee: TDK CORPORATIONInventors: Masaki Nagata, Kazuya Watanabe, Keisuke Uchida, Kohei Honma, Hiraku Hirabayashi
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Patent number: 11346898Abstract: An object is to provide a magnetic sensor module that suppresses a size of a magnetic sensor chip while applying a uniform calibration magnetic field to a magneto-resistive element. Provided is a magnetic sensor module comprising an IC chip having a first coil; and a magnetic sensor chip that is disposed on a surface of the IC chip and includes a first magnetic sensor that detects magnetism in a direction of first axis, wherein a planar shape of the IC chip encompasses a planar shape of the magnetic sensor chip, and the first coil has a planar shape including three or more sides, and is, when seen in a cross section along at least one side of the planar shape, is formed so as to cover a region, in a direction of the one side, of the first magnetic sensor.Type: GrantFiled: June 26, 2020Date of Patent: May 31, 2022Assignees: Asahi Kasei Microdevices Corporation, TDK CorporationInventors: Yoshitaka Okutsu, Masanori Yoshida, Kazuhiro Ishida, Kazuya Watanabe, Hiraku Hirabayashi, Masanori Sakai
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Patent number: 11340317Abstract: A magnetic sensor device includes a first magnetic sensor, a second magnetic sensor, and a soft magnetic structure. The first magnetic sensor generates a detection value corresponding to a component in a direction parallel to an X direction of an external magnetic field. The second magnetic sensor generates a detection value corresponding to a component in a direction parallel to a Y direction of the external magnetic field. In the presence of a residual magnetization in the X direction in the soft magnetic structure, a magnetic field that is based on the residual magnetization and contains a component in the ?X direction is applied to the first magnetic sensor. In the presence of a residual magnetization in the Y direction in the soft magnetic structure, a magnetic field that is based on the residual magnetization and contains a component in the ?Y direction is applied to the second magnetic sensor.Type: GrantFiled: October 28, 2020Date of Patent: May 24, 2022Assignee: TDK CORPORATIONInventors: Kazuya Watanabe, Hiraku Hirabayashi
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Patent number: 11333717Abstract: 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.Type: GrantFiled: August 21, 2020Date of Patent: May 17, 2022Assignee: TDK CORPORATIONInventors: Masaki Nagata, Kazuya Watanabe, Keisuke Uchida, Kohei Honma, Hiraku Hirabayashi
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Patent number: 11313920Abstract: This sensor unit includes a base having a substantially-rectangular planar shape including a first side and a second side that are substantially orthogonal to each other, and a plurality of first sensors provided on the base and arranged on a first axis. The first axis is substantially parallel to the first side and passes through a center position of the base.Type: GrantFiled: March 12, 2020Date of Patent: April 26, 2022Assignee: TDK CORPORATIONInventors: Kunihiro Ueda, Yoshimitsu Wada, Hiraku Hirabayashi, Kazuma Yamawaki, Tsuyoshi Umehara
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Patent number: 11293950Abstract: 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.Type: GrantFiled: June 5, 2018Date of Patent: April 5, 2022Assignee: TDK CorporationInventors: Yuta Saito, Kenichi Takano, Hiraku Hirabayashi
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Publication number: 20220082641Abstract: The magnetic sensor can prevent an increase of a positional detection error of a subject/object even in the case of applying an external magnetic field with a magnetic field intensity exceeding a predetermined range. A magnetic sensor is equipped with a magnetoresistive effect element (MR element) 11 that can detect an external magnetic field and a soft magnetic body shield 12. The soft magnetic body shield(s) 12 are/is positioned above and/or below the MR element 11 in a side view, and the size of the MR element 11 is physically included within a perimeter of the soft magnetic body shield 12.Type: ApplicationFiled: November 29, 2021Publication date: March 17, 2022Inventors: Keisuke UCHIDA, Hiraku HIRABAYASHI
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Patent number: 11274942Abstract: A position detection device includes a magnet that generates a magnetic field to be detected, and a magnetic sensor. The magnetic sensor detects the magnetic field to be detected and generates a detection value corresponding to the position of the magnet. The magnetic sensor includes an MR element and a substrate. The substrate includes a main surface. The magnetic field to be detected received by the MR element has a first direction that changes within a first plane. The MR element includes a magnetic layer having first magnetization that can change in direction within a second plane parallel to the main surface. The first plane and the second plane intersect at a dihedral angle ? other than 90°. A detection value depends on the direction of the first magnetization.Type: GrantFiled: May 29, 2020Date of Patent: March 15, 2022Assignee: TDK CORPORATIONInventors: Yongfu Cai, Hiraku Hirabayashi
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Publication number: 20220065956Abstract: 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.Type: ApplicationFiled: June 17, 2021Publication date: March 3, 2022Inventors: Kenichi TAKANO, Tsuyoshi UMEHARA, Yuta SAITO, Hiraku HIRABAYASHI
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Patent number: 11243271Abstract: A magnetic sensor includes first, second, and third detection units for detecting components in X, Y, and Z directions of an external magnetic field. The third detection unit includes a soft magnetic structure. The first detection unit includes a first portion and a second portion. The second detection unit includes a third portion and a fourth portion. The first portion and the fourth portion are located on opposite sides of the third detection unit in the X direction. The second portion and the third portion are located on opposite sides of the third detection unit in the Y direction.Type: GrantFiled: January 14, 2021Date of Patent: February 8, 2022Assignee: TDK CORPORATIONInventors: Kazuya Watanabe, Hiraku Hirabayashi
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Patent number: 11209503Abstract: The magnetic sensor can prevent an increase of a positional detection error of a subject/object even in the case of applying an external magnetic field with a magnetic field intensity exceeding a predetermined range. A magnetic sensor is equipped with a magnetoresistive effect element (MR element) 11 that can detect an external magnetic field and a soft magnetic body shield 12. The soft magnetic body shield(s) 12 are/is positioned above and/or below the MR element 11 in a side view, and the size of the MR element 11 is physically included within a perimeter of the soft magnetic body shield 12.Type: GrantFiled: October 28, 2019Date of Patent: December 28, 2021Assignee: TDK CorporationInventors: Keisuke Uchida, Hiraku Hirabayashi
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Patent number: 11204263Abstract: A position detection device includes a first magnetic field generation unit for generating a first magnetic field, a second magnetic field generation unit for generating a second magnetic field, and a magnetic sensor. The position of the second magnetic field generation unit relative to the first magnetic field generation unit is variable. The magnetic sensor detects the direction of a target magnetic field at a detection position in a reference plane. The target magnetic field is a composite magnetic field of first and second magnetic field components which are respective components of the first and second magnetic fields parallel to the reference plane. The magnetic sensor includes a magnetoresistive element including a free layer and a magnetization pinned layer. In the reference plane, two directions orthogonal to the magnetization direction of the magnetization pinned layer are each different from both of directions of the first and second magnetic field components.Type: GrantFiled: June 9, 2020Date of Patent: December 21, 2021Assignee: TDK CORPORATIONInventors: Tsuyoshi Umehara, Keisuke Uchida, Toshihide Suto, Hiraku Hirabayashi
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Patent number: 11169224Abstract: A magnetic field detection device includes a magnetic field detection element, a modulator, and a demodulator. The magnetic field detection element has a sensitivity axis in a first direction. The modulator is configured to apply, to the magnetic field detection element, a stress oscillating at a first frequency and including a component in a second direction, the second direction being orthogonal to the first direction. The demodulator is configured to demodulate an output signal having the first frequency and outputted from the magnetic field detection element, and detect, on a basis of an amplitude of the output signal, an intensity of a measurement magnetic field to be received by the magnetic field detection element.Type: GrantFiled: December 2, 2019Date of Patent: November 9, 2021Assignee: TDK CORPORATIONInventors: Kenzo Makino, Hiraku Hirabayashi
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Patent number: 11162772Abstract: A magnetic sensor device includes a composite chip component, and a sensor chip mounted on the composite chip component. The sensor chip includes a first magnetic sensor, a second magnetic sensor, and a third magnetic sensor that detect components of an external magnetic field that are in directions parallel to an X direction, parallel to a Y direction, and parallel to a Z direction, respectively. The composite chip component includes a first magnetic field generator, a second magnetic field generator, and a third magnetic field generator for generating additional magnetic field components that are in directions parallel to the X direction, parallel to the Y direction, and parallel to the Z direction, respectively.Type: GrantFiled: December 2, 2019Date of Patent: November 2, 2021Assignees: TDK CORPORATION, ASAHI KASEI MICRODEVICES CORPORATIONInventors: Kazuya Watanabe, Hiraku Hirabayashi, Yoshitaka Okutsu, Masanori Yoshida
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Patent number: 11156478Abstract: Magnetic sensor 1 has MR elements 11A to 14A that are connected to each other. MR elements 11A to 14A belongs either to group G1 in which electric resistance increases when the magnetization direction of each free layer 26 is rotated a predetermined angle in a same direction, or to group G2 in which the electric resistance decreases when the magnetization direction of each free layer 26 is rotated the predetermined angle in the same direction. A variation of an output of magnetic sensor 1 due to an increase of the electric resistance of the electric resistance elements of one group and a variation of the output of magnetic sensor 1 due to a decrease of the electric resistance of the electric resistance elements of another group are cancelled out.Type: GrantFiled: January 22, 2020Date of Patent: October 26, 2021Assignee: TDK CorporationInventors: Kenichi Takano, Yuta Saito, Hiraku Hirabayashi
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Publication number: 20210318513Abstract: A magnetic sensor includes first to fourth resistors, a power supply port, a ground port, a first output port, and a second output port. The first resistor and the second resistor are located in a first region and connected in series via a first connection point connected to the first output port. The third resistor and the fourth resistor are located in a second region and connected in series via a second connection point connected to the second output port, at least a part of the second region being located at a position different from the first region in a direction parallel to an X direction. The first and second resistors are located between the third and fourth resistors in a direction parallel to a Y direction.Type: ApplicationFiled: March 9, 2021Publication date: October 14, 2021Applicant: TDK CORPORATIONInventors: Yongfu CAI, Hiraku HIRABAYASHI, Tsuyoshi UMEHARA
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Patent number: 11119162Abstract: An angle sensor includes first and second detection units and an angle detection unit. Each of the first and second detection units generates two detection signals. The first and second detection units are arranged in a positional relationship that establishes predetermined phase relationships among the detection signals they generate. The angle detection unit includes first and second computing circuits and an angle computing unit. The first and second computing circuits generate first and second signals in each of which an error component corresponding to a fifth harmonic contained in the detection signals is reduced. The angle computing unit calculates a detected angle value on the basis of the first and second signals. The angle computing unit performs correction processing for reducing an error occurring in the detected angle value due to an error component corresponding to a third harmonic contained in the detection signals.Type: GrantFiled: June 15, 2020Date of Patent: September 14, 2021Assignee: TDK CORPORATIONInventors: Kazuya Watanabe, Keisuke Uchida, Hiraku Hirabayashi