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).

  • Patent number: 11506733
    Abstract: 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: Grant
    Filed: June 17, 2021
    Date of Patent: November 22, 2022
    Assignee: TDK Corporation
    Inventors: Kenichi Takano, Tsuyoshi Umehara, Yuta Saito, Hiraku Hirabayashi
  • Publication number: 20220333953
    Abstract: 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: Application
    Filed: April 5, 2022
    Publication date: October 20, 2022
    Applicant: TDK CORPORATION
    Inventors: Tsuyoshi UMEHARA, Hiraku HIRABAYASHI, Yongfu CAI
  • Publication number: 20220326320
    Abstract: A magnetic sensor includes a magnetic sensor chip that includes a magnetoresistive effect element and a sealed part. The magnetoresistive effect element includes a free layer and a pinned layer. The sealed part has a first surface and a second surface, which is opposite the first surface. The shape of the sealed part in the plan view from the first surface side is substantially quadrilateral. The substantially quadrilateral shape has a first side and a second side, which are substantially parallel to each other. In the plan view, from the first surface side of the sealed part, the magnetization direction of the pinned layer, in a state in which the external magnetic field is not applied on the magnetoresistive effect element, is inclined with respect to an approximately straight line found through the least squares method using a plurality of points arbitrarily set on the first side.
    Type: Application
    Filed: June 27, 2022
    Publication date: October 13, 2022
    Inventors: Yuta SAITO, Hiraku HIRABAYASHI, Yoshihiro KUDO
  • Publication number: 20220308095
    Abstract: A magnetic field detection apparatus includes a magnetoresistive effect element and a conductor. The magnetoresistive effect element includes a magnetoresistive effect film extending in a first axis direction and including a first end part, a second end part, and an intermediate part between the first and second end parts. The conductor includes a first part and a second part that each extend in a second axis direction inclined with respect to the first axis direction. The conductor is configured to be supplied with a current and thereby configured to generate an induction magnetic field to be applied to the magnetoresistive effect film in a third axis direction orthogonal to the second axis direction. The first part and the second part respectively overlap the first end part and the second end part in a fourth axis direction orthogonal to both of the second axis direction and the third axis direction.
    Type: Application
    Filed: May 26, 2022
    Publication date: September 29, 2022
    Applicant: TDK CORPORATION
    Inventors: Norikazu OTA, Kenzo MAKINO, Hiraku HIRABAYASHI
  • Publication number: 20220299582
    Abstract: At a reference position within a first plane, a magnetic field to be detected has a first direction that changes within the first plane. A magnetic sensor includes an MR element. The MR element includes a magnetic layer having first magnetization that can change in direction within a second plane. The first plane and the second plane intersect at a dihedral angle ? other than 90°. The magnetic field to be detected can be divided into an in-plane component parallel to the second plane and a perpendicular component perpendicular to the second plane. The in-plane component has a second direction that changes with a change in the first direction. The direction of the first magnetization changes with a change in the second direction. A detection value depends on the direction of the first magnetization.
    Type: Application
    Filed: June 9, 2022
    Publication date: September 22, 2022
    Applicant: TDK CORPORATION
    Inventors: Shunji SARUKI, Hiraku HIRABAYASHI, Masanori SAKAI
  • Publication number: 20220283201
    Abstract: A magnetic sensor device includes a first detection circuit that generates a first detection signal, a coil through which a feedback current is passed to generate a cancellation magnetic field, a second detection circuit that generates a second detection signal having a correspondence with a value of the feedback current, and a control circuit that controls the feedback current. In a closed-loop operation, the control circuit controls the feedback current so that the first detection signal has a constant value. In an open-loop operation, the control circuit maintains the feedback current at a constant value.
    Type: Application
    Filed: November 30, 2021
    Publication date: September 8, 2022
    Applicant: TDK CORPORATION
    Inventors: Yuta SAITO, Hiraku HIRABAYASHI
  • Publication number: 20220282996
    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
    Type: Application
    Filed: May 26, 2022
    Publication date: September 8, 2022
    Inventors: Masaki NAGATA, Kazuya WATANABE, Hiraku HIRABAYASHI
  • Publication number: 20220268564
    Abstract: 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: Application
    Filed: May 16, 2022
    Publication date: August 25, 2022
    Applicant: TDK CORPORATION
    Inventors: Yongfu CAI, Hiraku HIRABAYASHI
  • Publication number: 20220252681
    Abstract: A magnetic field detection device, containing a) a first soft magnetic body containing a1) a first plate including a first surface having a first outer edge; and a2) a first protrusion disposed directly or indirectly on the first surface of the first plate at a first arrangement position set back from the first outer edge, the first protrusion including a first tip on an opposite side to the first surface; and b) a magnetic detector provided in a vicinity of the first tip, wherein the magnetic detector has a magnetic sensing direction along the first surface, and the first protrusion is capable of bending a direction of a first magnetic flux, which comes into the first plate, along the first surface.
    Type: Application
    Filed: April 26, 2022
    Publication date: August 11, 2022
    Applicant: TDK CORPORATION
    Inventors: Masaki NAGATA, Kazuya WATANABE, Keisuke UCHIDA, Kohei HONMA, Hiraku HIRABAYASHI
  • Publication number: 20220244321
    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.
    Type: Application
    Filed: April 18, 2022
    Publication date: August 4, 2022
    Applicant: TDK CORPORATION
    Inventors: Masaki NAGATA, Kazuya WATANABE, Keisuke UCHIDA, Kohei HONMA, Hiraku HIRABAYASHI
  • Patent number: 11391795
    Abstract: At a reference position within a first plane, a magnetic field to be detected has a first direction that changes within the first plane. A magnetic sensor includes an MR element. The MR element includes a magnetic layer having first magnetization that can change in direction within a second plane. The first plane and the second plane intersect at a dihedral angle ? other than 90°. The magnetic field to be detected can be divided into an in-plane component parallel to the second plane and a perpendicular component perpendicular to the second plane. The in-plane component has a second direction that changes with a change in the first direction. The direction of the first magnetization changes with a change in the second direction. A detection value depends on the direction of the first magnetization.
    Type: Grant
    Filed: May 19, 2020
    Date of Patent: July 19, 2022
    Assignee: TDK CORPORATION
    Inventors: Shunji Saruki, Hiraku Hirabayashi, Masanori Sakai
  • Publication number: 20220214409
    Abstract: 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: Application
    Filed: March 24, 2022
    Publication date: July 7, 2022
    Applicant: TDK CORPORATION
    Inventors: Kunihiro UEDA, Yoshimitsu WADA, Hiraku HIRABAYASHI, Kazuma YAMAWAKI, Tsuyoshi UMEHARA
  • Patent number: 11371863
    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
    Type: Grant
    Filed: May 18, 2020
    Date of Patent: June 28, 2022
    Assignee: TDK Corporation
    Inventors: Masaki Nagata, Kazuya Watanabe, Hiraku Hirabayashi
  • Patent number: 11372029
    Abstract: A magnetic field detection apparatus includes a magnetoresistive effect element and a conductor. The magnetoresistive effect element includes a magnetoresistive effect film extending in a first axis direction and including a first end part, a second end part, and an intermediate part between the first and second end parts. The conductor includes a first part and a second part that each extend in a second axis direction inclined with respect to the first axis direction. The conductor is configured to be supplied with a current and thereby configured to generate an induction magnetic field to be applied to the magnetoresistive effect film in a third axis direction orthogonal to the second axis direction. The first part and the second part respectively overlap the first end part and the second end part in a fourth axis direction orthogonal to both of the second axis direction and the third axis direction.
    Type: Grant
    Filed: October 27, 2020
    Date of Patent: June 28, 2022
    Assignee: TDK CORPORATION
    Inventors: Norikazu Ota, Kenzo Makino, Hiraku Hirabayashi
  • Publication number: 20220187344
    Abstract: 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: Application
    Filed: March 4, 2022
    Publication date: June 16, 2022
    Inventors: Yuta SAITO, Kenichi TAKANO, HIRAKU HIRABAYASHI
  • Patent number: 11360286
    Abstract: 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: Grant
    Filed: March 9, 2021
    Date of Patent: June 14, 2022
    Assignee: TDK CORPORATION
    Inventors: Yongfu Cai, Hiraku Hirabayashi, Tsuyoshi Umehara
  • Patent number: 11359908
    Abstract: 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: Grant
    Filed: July 31, 2019
    Date of Patent: June 14, 2022
    Assignee: TDK CORPORATION
    Inventors: Yongfu Cai, Hiraku Hirabayashi
  • Patent number: 11353518
    Abstract: 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: Grant
    Filed: June 23, 2020
    Date of Patent: June 7, 2022
    Assignee: TDK CORPORATION
    Inventors: Masaki Nagata, Kazuya Watanabe, Keisuke Uchida, Kohei Honma, Hiraku Hirabayashi
  • Patent number: 11346898
    Abstract: 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: Grant
    Filed: June 26, 2020
    Date of Patent: May 31, 2022
    Assignees: Asahi Kasei Microdevices Corporation, TDK Corporation
    Inventors: Yoshitaka Okutsu, Masanori Yoshida, Kazuhiro Ishida, Kazuya Watanabe, Hiraku Hirabayashi, Masanori Sakai
  • Patent number: 11340317
    Abstract: 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: Grant
    Filed: October 28, 2020
    Date of Patent: May 24, 2022
    Assignee: TDK CORPORATION
    Inventors: Kazuya Watanabe, Hiraku Hirabayashi