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).

  • Publication number: 20200326390
    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: Application
    Filed: June 26, 2020
    Publication date: October 15, 2020
    Inventors: Yoshitaka OKUTSU, Masanori YOSHIDA, Kazuhiro ISHIDA, Kazuya WATANABE, Hiraku HIRABAYASHI, Masanori SAKAI
  • Publication number: 20200326399
    Abstract: An object is to provide a magnetic sensor module reducing influence of heat generated from a coil on a magnetic sensor. A conventional method requires, on a magnetic sensor chip, multiple temperature measuring circuits corresponding to multiple magnetic sensors, and many pads for connection to an IC chip. Therefore, the problem is increase in size of the sensor chip mounting the sensors and in manufacturing cost. Provided is a magnetic sensor module comprising an IC chip including a first coil, a first pad connected to one end of the coil, and a second pad to the other end; a magnetic sensor chip disposed on the IC chip's surface, including a first magnetic sensor detecting first axial magnetism; a first external output terminal; a first conductive wire for connecting the first pad and terminal; a second external output terminal; and a second conductive wire for connecting the second pad and terminal.
    Type: Application
    Filed: June 26, 2020
    Publication date: October 15, 2020
    Applicants: Asahi Kasei Microdevices Corporation, TDK Corporation, TDK Corporation
    Inventors: Masanori YOSHIDA, Yoshitaka OKUTSU, Kazuhiro ISHIDA, Kazuya WATANABE, Hiraku HIRABAYASHI, Masanori SAKAI
  • Publication number: 20200319264
    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: Application
    Filed: June 23, 2020
    Publication date: October 8, 2020
    Applicant: TDK CORPORATION
    Inventors: Masaki NAGATA, Kazuya WATANABE, Keisuke UCHIDA, Kohei HONMA, Hiraku HIRABAYASHI
  • Publication number: 20200309871
    Abstract: 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: Application
    Filed: June 15, 2020
    Publication date: October 1, 2020
    Applicant: TDK CORPORATION
    Inventors: Kazuya WATANABE, Keisuke UCHIDA, Hiraku HIRABAYASHI
  • Publication number: 20200300669
    Abstract: 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: Application
    Filed: June 9, 2020
    Publication date: September 24, 2020
    Applicant: TDK CORPORATION
    Inventors: Tsuyoshi UMEHARA, Keisuke UCHIDA, Toshihide SUTO, Hiraku HIRABAYASHI
  • Publication number: 20200300667
    Abstract: 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: Application
    Filed: January 22, 2020
    Publication date: September 24, 2020
    Inventors: Kenichi TAKANO, Yuta SAITO, Hiraku HIRABAYASHI
  • Patent number: 10782362
    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: Grant
    Filed: November 22, 2019
    Date of Patent: September 22, 2020
    Assignee: TDK CORPORATION
    Inventors: Masaki Nagata, Kazuya Watanabe, Keisuke Uchida, Kohei Honma, Hiraku Hirabayashi
  • Publication number: 20200292635
    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.
    Type: Application
    Filed: June 2, 2020
    Publication date: September 17, 2020
    Applicant: TDK CORPORATION
    Inventors: Masaki NAGATA, Kazuya WATANABE, Keisuke UCHIDA, Kohei HONMA, Hiraku HIRABAYASHI
  • Publication number: 20200292354
    Abstract: A position detection device includes a first position detector, a second position detector, and a signal generator. The first position detector includes a first magnetic field generation unit, a second magnetic field generation unit, and a first magnetic sensor. The second position detector includes a third magnetic field generation unit, a fourth magnetic field generation unit, and a second magnetic sensor. The positions of the second and fourth magnetic field generation units vary in response to variations in a detection-target position. The signal generator generates a position detection signal, which is the sum of a first detection signal generated by the first magnetic sensor and a second detection signal generated by the second magnetic sensor. Each of the first and second position detectors includes a bias magnetic field generation unit.
    Type: Application
    Filed: June 2, 2020
    Publication date: September 17, 2020
    Applicant: TDK CORPORATION
    Inventors: Tsuyoshi UMEHARA, Hayato MIYASHITA, Keisuke UCHIDA, Hiraku HIRABAYASHI
  • Patent number: 10775208
    Abstract: An angle sensor includes a detection signal generation unit, an angle detection unit for generating a detected angle value by performing an operation using detection signals, and a condition determination apparatus. The condition determination apparatus includes an initial determination value generation unit, correction processing unit and determination unit. The initial determination value generation unit performs an operation using the detection signals to generate an initial determination value corresponding to the angle sensor condition. The correction processing unit performs correction processing on the initial determination value to generate a corrected determination value. The determination unit determines whether the angle sensor is in a normal condition on the corrected determination value basis. The initial determination value contains a variation component which varies depending on an angle to be detected.
    Type: Grant
    Filed: March 22, 2017
    Date of Patent: September 15, 2020
    Assignee: TDK CORPORATION
    Inventors: Kazuya Watanabe, Hiraku Hirabayashi
  • Patent number: 10775195
    Abstract: A rotation angle sensing device is provided with a magnet that is placed to be integrally rotatable with a rotary shaft of a rotating body in association with a rotating body, where the shape of the magnet as viewed along the rotary shaft is substantially circular; a magnetic sensor part that outputs a sensor signal based upon a change in a direction of a magnetic field in association with the rotation of the magnet; and a rotation angle detecting part that detects a rotation angle of the rotating body based upon the sensor signal output by the magnetic sensor part. The magnet has a component of a magnetization vector in a direction that is orthogonal to the rotation axis.
    Type: Grant
    Filed: March 3, 2017
    Date of Patent: September 15, 2020
    Assignee: TDK Corporation
    Inventors: Masaki Nagata, Hiraku Hirabayashi, Yohei Hirota
  • Publication number: 20200284616
    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 18, 2020
    Publication date: September 10, 2020
    Inventors: Masaki NAGATA, Kazuya WATANABE, Hiraku HIRABAYASHI
  • Patent number: 10761150
    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: Grant
    Filed: August 28, 2017
    Date of Patent: September 1, 2020
    Assignee: TDK CORPORATION
    Inventors: Masaki Nagata, Kazuya Watanabe, Keisuke Uchida, Kohei Honma, Hiraku Hirabayashi
  • Patent number: 10746571
    Abstract: An angle sensor includes a detection signal generation unit for generating a plurality of detection signals, an angle detection unit for generating a detected angle value by performing an operation using the plural of detection signals, and a condition determination apparatus. The condition determination apparatus includes a determination value generation unit and a determination unit. The determination value generation unit performs an operation using the plurality of detection signals to generate a determination value corresponding to the condition of the angle sensor. The determination value varies depending on an angle to be detected. The determination unit determines whether the angle sensor is in a predetermined condition by determining whether the determination value falls within a determination range. The determination unit varies at least one threshold value that represents at least one end of the determination range.
    Type: Grant
    Filed: May 31, 2017
    Date of Patent: August 18, 2020
    Assignee: TDK CORPORATION
    Inventors: Kazuya Watanabe, Hiraku Hirabayashi
  • Patent number: 10732232
    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: August 25, 2017
    Date of Patent: August 4, 2020
    Assignee: TDK CORPORATION
    Inventors: Masaki Nagata, Kazuya Watanabe, Keisuke Uchida, Kohei Honma, Hiraku Hirabayashi
  • Patent number: 10712178
    Abstract: 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: Grant
    Filed: September 6, 2018
    Date of Patent: July 14, 2020
    Assignee: TDK CORPORATION
    Inventors: Keisuke Uchida, Tsuyoshi Umehara, Toshihide Suto, Hiraku Hirabayashi
  • Patent number: 10712404
    Abstract: 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: Grant
    Filed: August 14, 2017
    Date of Patent: July 14, 2020
    Assignee: TDK CORPORATION
    Inventors: Keisuke Uchida, Kazuya Watanabe, Hiraku Hirabayashi
  • Patent number: 10712177
    Abstract: A position detection device includes a first position detector, a second position detector, and a signal generator. The first position detector includes a first magnetic field generation unit, a second magnetic field generation unit, and a first magnetic sensor. The second position detector includes a third magnetic field generation unit, a fourth magnetic field generation unit, and a second magnetic sensor. The positions of the second and fourth magnetic field generation units vary in response to variations in a detection-target position. The signal generator generates a position detection signal, which is the sum of a first detection signal generated by the first magnetic sensor and a second detection signal generated by the second magnetic sensor. Each of the first and second position detectors includes a bias magnetic field generation unit.
    Type: Grant
    Filed: August 30, 2018
    Date of Patent: July 14, 2020
    Assignee: TDK CORPORATION
    Inventors: Tsuyoshi Umehara, Hayato Miyashita, Keisuke Uchida, Hiraku Hirabayashi
  • Patent number: 10705161
    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.
    Type: Grant
    Filed: May 6, 2019
    Date of Patent: July 7, 2020
    Assignee: TDK CORPORATION
    Inventors: Masaki Nagata, Kazuya Watanabe, Keisuke Uchida, Kohei Honma, Hiraku Hirabayashi
  • Publication number: 20200209325
    Abstract: 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: Application
    Filed: December 2, 2019
    Publication date: July 2, 2020
    Applicant: TDK CORPORATION
    Inventors: Kenzo MAKINO, Hiraku HIRABAYASHI