Patents by Inventor Tsuyoshi Umehara

Tsuyoshi Umehara 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: 11519978
    Abstract: A pair of bias magnets applies a bias magnetic field to the magneto-resistive effect element, the bias magnetic field having a component in a direction such that the component cancels the external magnetic field that is applied to the magneto-resistive effect element and a component that is perpendicular to the external magnetic field. The bias magnet has an elongate cross section in a plane that is parallel both to the external magnetic field and to the bias magnetic field. In a projection plane that is parallel to the cross section and onto which the bias magnets and the magneto-resistive effect element are projected, the bias magnet includes an element facing side that is opposite to the magneto-resistive effect element and that extends in a longitudinal direction. The bias magnet is magnetized in a direction that is perpendicular to the longitudinal direction. The element facing side is longer than other sides.
    Type: Grant
    Filed: March 25, 2021
    Date of Patent: December 6, 2022
    Assignee: TDK Corporation
    Inventors: Yohei Hirota, Hayato Miyashita, Tsuyoshi Umehara, Hiraku Hirabayashi
  • 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
  • Patent number: 11486734
    Abstract: A magnetic sensor system includes a magnetic field generator and a magnetic sensor. The magnetic sensor includes a plurality of MR elements. The plurality of MR elements are each configured so that a bias magnetic field in a second direction orthogonal to a first direction is applied to a free layer, and to change in resistance with a strength of a magnetic field component. A maximum strength of the magnetic field component applied to each of the MR elements is greater than or equal to 1.2 times the strength of a bias magnetic field.
    Type: Grant
    Filed: July 26, 2021
    Date of Patent: November 1, 2022
    Assignee: TDK CORPORATION
    Inventors: Yongfu Cai, Hayato Miyashita, Tsuyoshi Umehara, Yuta Saito
  • 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: 20220334201
    Abstract: A magnetic sensor is provided that can attenuate a magnetic field in a direction that is perpendicular to the magnetic field detecting direction at a higher rate than the magnetic field in the magnetic field detecting direction. Magnetic sensor 1 has: first soft magnetic layer 3; a pair of second soft magnetic layers 4A, 4B that is positioned at a location that is different from first soft magnetic layer 3 in the Z direction of first soft magnetic layer 3; and magnetic field detecting element 2 that is positioned between first soft magnetic layer 3 and second soft magnetic layers 4A, 4B in the Z direction, wherein magnetic field detecting element 2 has a magnetic field detecting direction that is parallel to a direction in which the pair of second soft magnetic layers 4A, 4B is arranged.
    Type: Application
    Filed: June 29, 2022
    Publication date: October 20, 2022
    Inventors: Kentaro HARADA, Tsuyoshi UMEHARA, Kenichi TAKANO
  • Patent number: 11408950
    Abstract: A magnetic sensor is provided that can attenuate a magnetic field in a direction that is perpendicular to the magnetic field detecting direction at a higher rate than the magnetic field in the magnetic field detecting direction. Magnetic sensor 1 has: first soft magnetic layer 3; a pair of second soft magnetic layers 4A, 4B that is positioned at a location that is different from first soft magnetic layer 3 in the Z direction of first soft magnetic layer 3; and magnetic field detecting element 2 that is positioned between first soft magnetic layer 3 and second soft magnetic layers 4A, 4B in the Z direction, wherein magnetic field detecting element 2 has a magnetic field detecting direction that is parallel to a direction in which the pair of second soft magnetic layers 4A, 4B is arranged.
    Type: Grant
    Filed: September 29, 2020
    Date of Patent: August 9, 2022
    Assignee: TDK Corporation
    Inventors: Kentaro Harada, Tsuyoshi Umehara, Kenichi Takano
  • Publication number: 20220229124
    Abstract: A method of designing a magnetic sensor that can easily accommodate various design conditions is provided. The method has: preparing magnetic sensors, wherein, for each magnetic sensor, magnetization directions of the first to fourth magnetically pinned layers form first to fourth angles ?1 to ?4 relative to a specific reference angle, respectively, and ?1=?3, ?2=?4, ?1??2, and each magnetic sensor has a value of ?1-?2 that is different from values of 01-02 of remaining magnetic sensors, for each magnetic sensor, obtaining a relationship between an angular range of the magnetization direction of the first to fourth magnetically free layers and an output range of the magnetic sensor, wherein the angular range satisfies a specific linear relationship between the magnetization direction and the output of the magnetic sensor, and selecting a magnetic sensor that satisfies required conditions for the angular range and the output range from among the magnetic sensors.
    Type: Application
    Filed: December 7, 2021
    Publication date: July 21, 2022
    Inventors: Tsuyoshi UMEHARA, Kentaro HARADA, Takafumi KOBAYASHI
  • 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: 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
  • Publication number: 20220128345
    Abstract: Magnetic sensor assembly 1 has first member 10 having first to third magnetic sensors 13A to 13C, and second member 20 having first to third magnets 22A to 22C. Second member 20 can be moved in X and Y directions and can be rotated about a Z axis relative to first member 10. Output of first to third magnetic sensors 13A to 13C monotonously changes. A change of the output of first magnetic sensor and a change of the output of second magnetic sensor are different from each other. First to third magnets are positioned on first to third straight lines L1 to L3. A first angle that is formed between first straight line L1 and X axis, a second angle that is formed between second straight line L2 and X axis, and a third angle that is formed between third straight line L3 and Y axis are same.
    Type: Application
    Filed: October 15, 2021
    Publication date: April 28, 2022
    Inventors: Kentaro HARADA, Tsuyoshi UMEHARA
  • Patent number: 11313920
    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: Grant
    Filed: March 12, 2020
    Date of Patent: April 26, 2022
    Assignee: TDK CORPORATION
    Inventors: Kunihiro Ueda, Yoshimitsu Wada, Hiraku Hirabayashi, Kazuma Yamawaki, Tsuyoshi Umehara
  • Publication number: 20220065956
    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: Application
    Filed: June 17, 2021
    Publication date: March 3, 2022
    Inventors: Kenichi TAKANO, Tsuyoshi UMEHARA, Yuta SAITO, Hiraku HIRABAYASHI
  • Publication number: 20220042826
    Abstract: A magnetic sensor system includes a magnetic field generator and a magnetic sensor. The magnetic sensor includes a plurality of MR elements. The plurality of MR elements are each configured so that a bias magnetic field in a second direction orthogonal to a first direction is applied to a free layer, and to change in resistance with a strength of a magnetic field component. A maximum strength of the magnetic field component applied to each of the MR elements is greater than or equal to 1.2 times the strength of a bias magnetic field.
    Type: Application
    Filed: July 26, 2021
    Publication date: February 10, 2022
    Applicant: TDK CORPORATION
    Inventors: Yongfu CAI, Hayato MIYASHITA, Tsuyoshi UMEHARA, Yuta SAITO
  • Patent number: 11215478
    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 7, 2020
    Date of Patent: January 4, 2022
    Assignee: TDK CORPORATION
    Inventors: Kenzo Makino, Tsuyoshi Umehara
  • Patent number: 11204263
    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: June 9, 2020
    Date of Patent: December 21, 2021
    Assignee: TDK CORPORATION
    Inventors: Tsuyoshi Umehara, Keisuke Uchida, Toshihide Suto, Hiraku Hirabayashi
  • Publication number: 20210318513
    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: March 9, 2021
    Publication date: October 14, 2021
    Applicant: TDK CORPORATION
    Inventors: Yongfu CAI, Hiraku HIRABAYASHI, Tsuyoshi UMEHARA
  • Publication number: 20210208216
    Abstract: A pair of bias magnets applies a bias magnetic field to the magneto-resistive effect element, the bias magnetic field having a component in a direction such that the component cancels the external magnetic field that is applied to the magneto-resistive effect element and a component that is perpendicular to the external magnetic field. The bias magnet has an elongate cross section in a plane that is parallel both to the external magnetic field and to the bias magnetic field. In a projection plane that is parallel to the cross section and onto which the bias magnets and the magneto-resistive effect element are projected, the bias magnet includes an element facing side that is opposite to the magneto-resistive effect element and that extends in a longitudinal direction. The bias magnet is magnetized in a direction that is perpendicular to the longitudinal direction. The element facing side is longer than other sides.
    Type: Application
    Filed: March 25, 2021
    Publication date: July 8, 2021
    Inventors: Yohei HIROTA, Hayato MIYASHITA, Tsuyoshi UMEHARA, Hiraku HIRABAYASHI
  • Patent number: 11009567
    Abstract: A pair of bias magnets applies a bias magnetic field to the magneto-resistive effect element, the bias magnetic field having a component in a direction such that the component cancels the external magnetic field that is applied to the magneto-resistive effect element and a component that is perpendicular to the external magnetic field. The bias magnet has an elongate cross section in a plane that is parallel both to the external magnetic field and to the bias magnetic field. In a projection plane that is parallel to the cross section and onto which the bias magnets and the magneto-resistive effect element are projected, the bias magnet includes an element facing side that is opposite to the magneto-resistive effect element and that extends in a longitudinal direction. The bias magnet is magnetized in a direction that is perpendicular to the longitudinal direction. The element facing side is longer than other sides.
    Type: Grant
    Filed: May 30, 2018
    Date of Patent: May 18, 2021
    Assignee: TDK Corporation
    Inventors: Yohei Hirota, Hayato Miyashita, Tsuyoshi Umehara, Hiraku Hirabayashi
  • Publication number: 20210123992
    Abstract: A magnetic sensor is provided that can attenuate a magnetic field in a direction that is perpendicular to the magnetic field detecting direction at a higher rate than the magnetic field in the magnetic field detecting direction. Magnetic sensor 1 has: first soft magnetic layer 3; a pair of second soft magnetic layers 4A, 4B that is positioned at a location that is different from first soft magnetic layer 3 in the Z direction of first soft magnetic layer 3; and magnetic field detecting element 2 that is positioned between first soft magnetic layer 3 and second soft magnetic layers 4A, 4B in the Z direction, wherein magnetic field detecting element 2 has a magnetic field detecting direction that is parallel to a direction in which the pair of second soft magnetic layers 4A, 4B is arranged.
    Type: Application
    Filed: September 29, 2020
    Publication date: April 29, 2021
    Inventors: Kentaro HARADA, Tsuyoshi UMEHARA, Kenichi TAKANO
  • Publication number: 20210018337
    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 7, 2020
    Publication date: January 21, 2021
    Applicant: TDK CORPORATION
    Inventors: Kenzo MAKINO, Tsuyoshi UMEHARA