Patents by Inventor Kenzo Makino

Kenzo Makino 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: 10830614
    Abstract: A magnetic sensor generates a detection signal that varies according to the strength of a target magnetic field at a detection position in a reference plane. The magnetic sensor includes a magnetoresistive element. The magnetoresistive element includes a magnetization pinned layer having a magnetization in a first direction, and a free layer having a magnetization whose direction is variable according to the direction of an acting magnetic field, the acting magnetic field being a composite magnetic field of all magnetic fields acting on the free layer. The free layer has uniaxial magnetic anisotropy such that an easy axis of magnetization is oriented in a direction parallel to a second direction. In the reference plane, both of two directions orthogonal to the second direction are different from the direction of the target magnetic field.
    Type: Grant
    Filed: October 15, 2018
    Date of Patent: November 10, 2020
    Assignee: TDK CORPORATION
    Inventors: Kenzo Makino, Tsuyoshi Umehara
  • Patent number: 10830838
    Abstract: A magnetic sensor includes a magnetic field conversion unit, a magnetic field detection unit, and a magnetic film. The magnetic field conversion unit includes a yoke that receives an input magnetic field and generates an output magnetic field. The input magnetic field contains an input magnetic field component in a direction parallel to Z direction. The output magnetic field contains an output magnetic field component in a direction parallel to X direction. The magnetic field detection unit includes a magnetic detection element that receives the output magnetic field and generates a detection value corresponding to the output magnetic field component. The magnetic film absorbs part of magnetic flux resulting from a noise magnetic field, which is a magnetic field in a direction to which the magnetic detection element has sensitivity and which is other than the output magnetic field component.
    Type: Grant
    Filed: July 6, 2018
    Date of Patent: November 10, 2020
    Assignee: TDK CORPORATION
    Inventors: Keisuke Uchida, Kenzo Makino
  • Publication number: 20200300944
    Abstract: A magnetic field detection device includes a magnetism detection element, a modulator, and a demodulator. The magnetism detection element has a sensitivity axis along a first direction. The modulator is configured to impart a spin torque to the magnetism detection element. The spin torque has a rotational force and oscillates at a first frequency. The rotational force is exerted on a plane including the first direction and a second direction orthogonal to the first direction. The demodulator is configured to demodulate an output signal received from the magnetism detection element and to detect an intensity of a measurement target magnetic field exerted on the magnetism detection element on the basis of an amplitude of the output signal. The output signal has the first frequency.
    Type: Application
    Filed: February 10, 2020
    Publication date: September 24, 2020
    Applicant: TDK Corporation
    Inventors: Kenzo MAKINO, Hiroshi KIYONO
  • Publication number: 20200300942
    Abstract: A magneto-resistive effect element includes a magnetization free layer, an intermediate layer, and a magnetization pinned layer. The magnetization free layer extends along a first plane. The intermediate layer extends along the first plane, and is stacked on the magnetization free layer. The magnetization pinned layer extends along the first plane, and is provided on side opposite to the magnetization free layer with the intermediate layer being interposed therebetween. Here, the magnetization free layer includes an end surface that has a maximum inclination angle of 42° or less relative to the first plane.
    Type: Application
    Filed: June 9, 2020
    Publication date: September 24, 2020
    Applicant: TDK CORPORATION
    Inventors: Kenzo MAKINO, Suguru WATANABE, Yasushi NISHIOKA, Hirokazu TAKAHASHI
  • Publication number: 20200295694
    Abstract: A rotating electric machine apparatus including: a rotating electric machine (REM) including a rotor and a stator; an inverter device including an inverter circuit (IC) for driving the REM and an inverter control unit (ICU) for controlling the IC; a detector, in which a first antenna is connected to a resonance circuitry, which is mounted to the REM and has a resonance characteristic that changes depending on a change in a physical quantity; and a detection processor receiving a response radio wave indicating a detection result of the change in the physical quantity from the first antenna while transmitting a transmission radio wave at a set carrier frequency from a second antenna, and comparing the detection result and the set value, to thereby obtain an abnormal state in the REM. The ICU controls output of the IC in accordance with an abnormal state signal from the detection processor.
    Type: Application
    Filed: November 24, 2017
    Publication date: September 17, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yoshihiro MIYAMA, Hideaki ARITA, Junji HORI, Tomohira TAKAHASHI, Kenzo MAKINO, Masaya INOUE
  • Publication number: 20200292630
    Abstract: A magnet flux absorber of the present invention has a soft magnetic layer having a first surface and a second surface that is a back surface of the first surface, as well as and at least one magnetically pinning portion that faces a part of the first surface of the soft magnetic layer or a part of the second surface of the soft magnetic layer. A region of the soft magnetic layer that faces the magnetically pinning portion is magnetized by the magnetically pinning portion in a direction that is different from a direction in which at least a part of remaining region of the soft magnetic layer is magnetized.
    Type: Application
    Filed: February 24, 2020
    Publication date: September 17, 2020
    Inventor: Kenzo MAKINO
  • Publication number: 20200284664
    Abstract: A temperature detection device includes: a detection processing unit configured to transmit a transmission radio wave, simultaneously receive a response radio wave corresponding to the transmission radio wave, and detect whether a temperature of an object to be measured is normal or abnormal based on the response radio wave; and a temperature sensing unit configured to receive the transmission radio wave and transmit the response radio wave responding to the transmission radio wave. The detection processing unit calculates, from the response radio wave received via a second antenna, an amplitude, a phase, or a quadrature phase amplitude of the response radio wave and compares the temperature of the object to be measured to a temperature determined in advance based on a result of the calculation.
    Type: Application
    Filed: November 24, 2017
    Publication date: September 10, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kenzo MAKINO, Hideaki ARITA, Masaya INOUE, Junji HORI, Hiroshi ARAKI, Yoshitsugu SAWA, Wataru TSUJITA
  • Patent number: 10718828
    Abstract: A magneto-resistive effect element includes a magnetization free layer, an intermediate layer, and a magnetization pinned layer. The magnetization free layer extends along a first plane. The intermediate layer extends along the first plane, and is stacked on the magnetization free layer. The magnetization pinned layer extends along the first plane, and is provided on side opposite to the magnetization free layer with the intermediate layer being interposed therebetween. Here, the magnetization free layer includes an end surface that has a maximum inclination angle of 42° or less relative to the first plane.
    Type: Grant
    Filed: February 28, 2018
    Date of Patent: July 21, 2020
    Assignee: TDK CORPORATION
    Inventors: Kenzo Makino, Suguru Watanabe, Yasushi Nishioka, Hirokazu Takahashi
  • 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
  • Patent number: 10672421
    Abstract: A magnetoresistive device includes an MR element and a bias magnetic field generation unit. The MR element includes a free layer shaped to be long in one direction. The bias magnetic field generation unit includes a ferromagnetic layer for generating a bias magnetic field. The ferromagnetic layer includes two main portions, a first side portion, and a second side portion arranged to surround the perimeter of the free layer. In any cross section perpendicular to the longitudinal direction of the free layer, a shortest distance between the first side portion and the free layer and a shortest distance between the second side portion and the free layer are 35 nm or less.
    Type: Grant
    Filed: March 6, 2019
    Date of Patent: June 2, 2020
    Assignee: TDK Corporation
    Inventor: Kenzo Makino
  • Publication number: 20200130717
    Abstract: A rail state monitoring apparatus (1) includes: first and second transmission antennas (101, 102) to transmit first and second electric signals to rails (5, 6), respectively; first reception antenna (201) to receive a surface wave (21) of the first electric signal propagated through rail (5) and guided wave (32) of the second electric signal propagated through loop coil (10); second reception antenna (202) to receive surface wave (22) of the second electric signal propagated through rail (6) and guided wave (31) of the first electric signal propagated through loop coil (10); and a processor. The processor obtains received powers of the respective electric signals received by first and second reception antennas (201, 202), determines a rail state from “good”, “rail broken”, “rail crack”, or “rail surface anomaly” based on the received powers, and outputs the rail state as rail state information.
    Type: Application
    Filed: October 24, 2018
    Publication date: April 30, 2020
    Applicants: MITSUBISHI ELECTRIC CORPORATION, MITSUBISHI ELECTRIC RESEARCH LABORATORIES, INC.
    Inventors: Wataru TSUJITA, Kenzo MAKINO, Atsushi TAKAMI, Bingnan WANG
  • Publication number: 20190293732
    Abstract: A magnetoresistive device includes an MR element and a bias magnetic field generation unit. The MR element includes a free layer shaped to be long in one direction. The bias magnetic field generation unit includes a ferromagnetic layer for generating a bias magnetic field. The ferromagnetic layer includes two main portions, a first side portion, and a second side portion arranged to surround the perimeter of the free layer. In any cross section perpendicular to the longitudinal direction of the free layer, a shortest distance between the first side portion and the free layer and a shortest distance between the second side portion and the free layer are 35 nm or less.
    Type: Application
    Filed: March 6, 2019
    Publication date: September 26, 2019
    Applicant: TDK CORPORATION
    Inventor: Kenzo MAKINO
  • Publication number: 20190277660
    Abstract: A magnetic sensor generates a detection signal that varies according to the strength of a target magnetic field at a detection position in a reference plane. The magnetic sensor includes a magnetoresistive element. The magnetoresistive element includes a magnetization pinned layer having a magnetization in a first direction, and a free layer having a magnetization whose direction is variable according to the direction of an acting magnetic field, the acting magnetic field being a composite magnetic field of all magnetic fields acting on the free layer. The free layer has uniaxial magnetic anisotropy such that an easy axis of magnetization is oriented in a direction parallel to a second direction. In the reference plane, both of two directions orthogonal to the second direction are different from the direction of the target magnetic field.
    Type: Application
    Filed: October 15, 2018
    Publication date: September 12, 2019
    Applicant: TDK CORPORATION
    Inventors: Kenzo MAKINO, Tsuyoshi UMEHARA
  • Patent number: 10401441
    Abstract: A magnetic sensor includes a magnetic field conversion unit and a magnetic field detection unit. The magnetic field conversion unit receives an input magnetic field containing an input magnetic field component in a direction parallel to Z direction, and generates an output magnetic field containing an output magnetic field component in a direction parallel to X direction. The magnetic field detection unit receives the output magmetic field and generates an output signal corresponding to the input magnetic field component. The magnetic field detection unit includes first and second magnetic detection elements. When misalignment occurs between the magnetic field conversion unit and the magnetic field detection unit, one of the strength of a portion of the output magnetic field component that the first magnetic detection element receives and the strength of a portion of the output magnetic field component that the second magnetic detection element receives increases while the other decreases.
    Type: Grant
    Filed: February 8, 2018
    Date of Patent: September 3, 2019
    Assignee: TDK CORPORATION
    Inventors: Keisuke Uchida, Kenzo Makino, Hiraku Hirabayashi
  • Publication number: 20190056459
    Abstract: A magnetic sensor includes a magnetic field conversion unit, a magnetic field detection unit, and a magnetic film. The magnetic field conversion unit includes a yoke that receives an input magnetic field and generates an output magnetic field. The input magnetic field contains an input magnetic field component in a direction parallel to Z direction. The output magnetic field contains an output magnetic field component in a direction parallel to X direction. The magnetic field detection unit includes a magnetic detection element that receives the output magnetic field and generates a detection value corresponding to the output magnetic field component. The magnetic film absorbs part of magnetic flux resulting from a noise magnetic field, which is a magnetic field in a direction to which the magnetic detection element has sensitivity and which is other than the output magnetic field component.
    Type: Application
    Filed: July 6, 2018
    Publication date: February 21, 2019
    Applicant: TDK CORPORATION
    Inventors: Keisuke UCHIDA, Kenzo MAKINO
  • Publication number: 20180292472
    Abstract: A magneto-resistive effect element includes a magnetization free layer, an intermediate layer, and a magnetization pinned layer. The magnetization free layer extends along a first plane. The intermediate layer extends along the first plane, and is stacked on the magnetization free layer. The magnetization pinned layer extends along the first plane, and is provided on side opposite to the magnetization free layer with the intermediate layer being interposed therebetween. Here, the magnetization free layer includes an end surface that has a maximum inclination angle of 42° or less relative to the first plane.
    Type: Application
    Filed: February 28, 2018
    Publication date: October 11, 2018
    Applicant: TDK CORPORATION
    Inventors: Kenzo MAKINO, Suguru WATANABE, Yasushi NISHIOKA, Hirokazu TAKAHASHI
  • Publication number: 20180275217
    Abstract: A magnetic sensor includes a magnetic field conversion unit and a magnetic field detection unit. The magnetic field conversion unit receives an input magnetic field containing an input magnetic field component in a direction parallel to Z direction, and generates an output magnetic field containing an output magnetic field component in a direction parallel to X direction. The magnetic field detection unit receives the output magmetic field and generates an output signal corresponding to the input magnetic field component. The magnetic field detection unit includes first and second magnetic detection elements. When misalignment occurs between the magnetic field conversion unit and the magnetic field detection unit, one of the strength of a portion of the output magnetic field component that the first magnetic detection element receives and the strength of a portion of the output magnetic field component that the second magnetic detection element receives increases while the other decreases.
    Type: Application
    Filed: February 8, 2018
    Publication date: September 27, 2018
    Applicant: TDK CORPORATION
    Inventors: Keisuke UCHIDA, Kenzo MAKINO, Hiraku HIRABAYASHI
  • Patent number: 9792934
    Abstract: A multi reader head has a plurality of readers that are laminated via a gap layer(s), and each of the readers has a structure in which a current-perpendicular-to-plane (CPP) type of magneto-resistive effect element, where a current flows along the lamination direction, is interposed between a pair of shields that function as an electrode, respectively, from both sides in the lamination direction. The shields that are opposed from each other via the gap layer of the readers that are adjacent in the lamination direction by a distance that is not constant, but include a portion with a greater distance between the shields and another portion with a smaller distance between the shields are included. The portion with a greater distance between the shields is situated at a position away from the center on an air bearing surface opposing to a recording medium in the magneto-resistive effect element.
    Type: Grant
    Filed: March 3, 2016
    Date of Patent: October 17, 2017
    Assignee: TDK Corporation
    Inventors: Tetsuya Hiraki, Minoru Ota, Hisayoshi Watanabe, Kenzo Makino, Hideyuki Ukita
  • Publication number: 20170256276
    Abstract: A multi reader head has a plurality of readers that are laminated via a gap layer(s), and each of the readers has a structure in which a current-perpendicular-to-plane (CPP) type of magneto-resistive effect element, where a current flows along the lamination direction, is interposed between a pair of shields that function as an electrode, respectively, from both sides in the lamination direction. The shields that are opposed from each other via the gap layer of the readers that are adjacent in the lamination direction by a distance that is not constant, but include a portion with a greater distance between the shields and another portion with a smaller distance between the shields are included. The portion with a greater distance between the shields is situated at a position away from the center on an air bearing surface opposing to a recording medium in the magneto-resistive effect element.
    Type: Application
    Filed: March 3, 2016
    Publication date: September 7, 2017
    Inventors: Tetsuya HIRAKI, Minoru OTA, Hisayoshi WATANABE, Kenzo MAKINO, Hideyuki UKITA
  • Patent number: 9514771
    Abstract: A magneto-resistive effect element has a first shield layer, a second layer, and a multilayer film that is positioned between the first shield layer and the second shield layer. The multilayer film has a free layer, a first pinned layer, a nonmagnetic spacer layer, a second pinned layer that fixes a magnetization direction of the first pinned layer, and an antiferromagnetic layer that is exchange-coupled with the second pinned layer. The antiferromagnetic layer is positioned away from an air bearing surface (ABS).
    Type: Grant
    Filed: March 30, 2015
    Date of Patent: December 6, 2016
    Assignee: TDK Corporation
    Inventors: Kenzo Makino, Satoshi Miura