Patents by Inventor Yohei Hirota

Yohei Hirota 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: 11855035
    Abstract: A stack of electrical components has a first electrical component having a first surface, a second surface that is opposite to the first surface and a side surface that is located between the first surface and the second surface; a second electrical component having a third surface on which the first electrical component is mounted, the third surface facing the second surface and forming a corner portion between the third surface and the side surface; an adhesive layer that bonds the first electrical component to the second electrical component, the adhesive layer has a first portion that is located between the second and third surface and a second portion that is made of a same material as the first portion and that fills the corner portion; and a conductive layer that extends on a side of the side surface, curves along the second portion and extends to the third surface.
    Type: Grant
    Filed: June 29, 2021
    Date of Patent: December 26, 2023
    Assignee: TDK Corporation
    Inventors: Yohei Hirota, Hiroshi Yamazaki, Hitoshi Iwama, Yusuke Takahashi
  • Publication number: 20230112733
    Abstract: A displacement detection apparatus includes a magnetic field generator, a first soft magnetic body, a second soft magnetic body, and a magnetic detection element. The magnetic field generator extends along a plane orthogonal to a first direction and includes a first portion and a second portion. The first soft magnetic body entirely overlaps the first portion in the first direction. The second soft magnetic body entirely overlaps the second portion in the first direction. The magnetic detection element is disposed in a region between the first soft magnetic body and the second soft magnetic body, and is configured to be subjected to a magnetic field generated by the magnetic field generator. The magnetic field generator, the first soft magnetic body, and the second soft magnetic body are provided to be integrally rotatable, with respect to the magnetic detection element, around a rotation axis extending in the first direction.
    Type: Application
    Filed: August 12, 2022
    Publication date: April 13, 2023
    Applicant: TDK CORPORATION
    Inventors: Yohei HIROTA, Naoki OHTA
  • Publication number: 20230074404
    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: November 14, 2022
    Publication date: March 9, 2023
    Inventors: Yohei HIROTA, Hayato MIYASHITA, Tsuyoshi UMEHARA, Hiraku HIRABAYASHI
  • 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
  • Publication number: 20210327846
    Abstract: A stack of electrical components has a first electrical component having a first surface, a second surface that is opposite to the first surface and a side surface that is located between the first surface and the second surface; a second electrical component having a third surface on which the first electrical component is mounted, the third surface facing the second surface and forming a corner portion between the third surface and the side surface; an adhesive layer that bonds the first electrical component to the second electrical component, the adhesive layer has a first portion that is located between the second and third surface and a second portion that is made of a same material as the first portion and that fills the corner portion; and a conductive layer that extends on a side of the side surface, curves along the second portion and extends to the third surface.
    Type: Application
    Filed: June 29, 2021
    Publication date: October 21, 2021
    Inventors: Yohei HIROTA, Hiroshi YAMAZAKI, Hitoshi IWAMA, Yusuke TAKAHASHI
  • Patent number: 11088106
    Abstract: A stack of electrical components has a first electrical component having a first surface, a second surface that is opposite to the first surface and a side surface that is located between the first surface and the second surface; a second electrical component having a third surface on which the first electrical component is mounted, the third surface facing the second surface and forming a corner portion between the third surface and the side surface; an adhesive layer that bonds the first electrical component to the second electrical component, wherein the adhesive layer has a first portion that is located between the second surface and the third surface and a curved second portion that fills the corner portion; and a conductive layer that extends on a side of the side surface, curves along the second portion and extends to the third surface.
    Type: Grant
    Filed: August 30, 2019
    Date of Patent: August 10, 2021
    Assignee: TDK Corporation
    Inventors: Yohei Hirota, Hiroshi Yamazaki, Hitoshi Iwama, Yusuke Takahashi
  • 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
  • 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
  • Patent number: 10648787
    Abstract: A first, a second, and a third computing circuit respectively generate a first post-computation signal with a second harmonic component reduced as compared with first and second signals, a second post-computation signal with the second harmonic component reduced as compared with third and fourth signals, and a third post-computation signal with the second harmonic component reduced as compared with fifth and sixth signals. A fourth and a fifth computing circuit respectively generate a fourth post-computation signal with a third harmonic component reduced as compared with the first and second post-computation signals, and a fifth post-computation signal with the third harmonic component reduced as compared with the second and third post-computation signals. A sixth computing circuit determines a detected angle value based on the fourth and fifth post-computation signals.
    Type: Grant
    Filed: June 27, 2019
    Date of Patent: May 12, 2020
    Assignee: TDK CORPORATION
    Inventors: Yohei Hirota, Homare Tokida, Hiraku Hirabayashi
  • Publication number: 20200118963
    Abstract: A stack of electrical components has a first electrical component having a first surface, a second surface that is opposite to the first surface and a side surface that is located between the first surface and the second surface; a second electrical component having a third surface on which the first electrical component is mounted, the third surface facing the second surface and forming a corner portion between the third surface and the side surface; an adhesive layer that bonds the first electrical component to the second electrical component, wherein the adhesive layer has a first portion that is located between the second surface and the third surface and a curved second portion that fills the corner portion; and a conductive layer that extends on a side of the side surface, curves along the second portion and extends to the third surface.
    Type: Application
    Filed: August 30, 2019
    Publication date: April 16, 2020
    Inventors: Yohei HIROTA, Hiroshi YAMAZAKI, Hitoshi IWAMA, Yusuke TAKAHASHI
  • Publication number: 20190316894
    Abstract: A first, a second, and a third computing circuit respectively generate a first post-computation signal with a second harmonic component reduced as compared with first and second signals, a second post-computation signal with the second harmonic component reduced as compared with third and fourth signals, and a third post-computation signal with the second harmonic component reduced as compared with fifth and sixth signals. A fourth and a fifth computing circuit respectively generate a fourth post-computation signal with a third harmonic component reduced as compared with the first and second post-computation signals, and a fifth post-computation signal with the third harmonic component reduced as compared with the second and third post-computation signals. A sixth computing circuit determines a detected angle value based on the fourth and fifth post-computation signals.
    Type: Application
    Filed: June 27, 2019
    Publication date: October 17, 2019
    Applicant: TDK CORPORATION
    Inventors: Yohei HIROTA, Homare TOKIDA, Hiraku HIRABAYASHI
  • Patent number: 10401195
    Abstract: A displacement detection unit includes a magnet and a magnetic detector. The magnet includes a first magnetic-pole region polarized into a south pole and a second magnetic-pole region polarized into a north pole, and generates a magnetic field around the magnet. The magnetic detector is movable relative to the magnet in a first direction, and detects a change in the magnetic field and thereby detects a displacement of the magnet in the first direction. The magnet includes a transition section in which a ratio of a magnetic volume of the second magnetic-pole region in a second direction to a magnetic volume of the first magnetic-pole region in the second direction gradually varies in the first direction. The second direction is orthogonal to the first direction.
    Type: Grant
    Filed: February 22, 2017
    Date of Patent: September 3, 2019
    Assignee: TDK CORPORATION
    Inventors: Yohei Hirota, Hiraku Hirabayashi, Keisuke Uchida, Kazuya Watanabe
  • Patent number: 10386169
    Abstract: A first, a second, and a third computing circuit respectively generate a first post-computation signal with a second harmonic component reduced as compared with first and second signals, a second post-computation signal with the second harmonic component reduced as compared with third and fourth signals, and a third post-computation signal with the second harmonic component reduced as compared with fifth and sixth signals. A fourth and a fifth computing circuit respectively generate a fourth post-computation signal with a third harmonic component reduced as compared with the first and second post-computation signals, and a fifth post-computation signal with the third harmonic component reduced as compared with the second and third post-computation signals. A sixth computing circuit determines a detected angle value based on the fourth and fifth post-computation signals.
    Type: Grant
    Filed: June 19, 2014
    Date of Patent: August 20, 2019
    Assignee: TDK CORPORATION
    Inventors: Yohei Hirota, Homare Tokida, Hiraku Hirabayashi
  • Publication number: 20190118309
    Abstract: A joint structure includes a first metal part and a second metal part. The first metal part includes a nickel-iron alloy or copper. The second metal part is provided adjacent to the first metal part and includes tin. Out of the first metal part and the second metal part, the first metal part includes a plurality of first metal parts, or out of the first metal part and the second metal part, the second metal part includes a plurality of second metal parts, or the first metal part includes the plurality of first metal parts and the second metal part includes the plurality of second metal parts.
    Type: Application
    Filed: October 12, 2018
    Publication date: April 25, 2019
    Applicant: TDK CORPORATION
    Inventors: Yohei HIROTA, Hiroshi YAMAZAKI
  • Publication number: 20180356473
    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: May 30, 2018
    Publication date: December 13, 2018
    Inventors: Yohei HIROTA, Hayato MIYASHITA, Tsuyoshi UMEHARA, Hiraku HIRABAYASHI
  • Patent number: 10082406
    Abstract: A magnetic field detection apparatus has a first magnetic sensor and a bias magnet positioned to face the first magnetic sensor. The bias magnet has a magnetic pole surface that faces the first magnetic sensor and that applies a bias magnetic field to the first magnetic sensor. The first magnetic sensor detects magnetic field in a first direction that is parallel to the magnetic pole surface. The magnetic pole surface of the bias magnet has a plurality of grooves arranged in the first direction.
    Type: Grant
    Filed: August 11, 2016
    Date of Patent: September 25, 2018
    Assignee: TDK Corporation
    Inventors: Hiroshi Naganuma, Yohei Hirota, Kunihiro Ueda
  • Publication number: 20170261346
    Abstract: A displacement detection unit includes a magnet and a magnetic detector. The magnet includes a first magnetic-pole region polarized into a south pole and a second magnetic-pole region polarized into a north pole, and generates a magnetic field around the magnet. The magnetic detector is movable relative to the magnet in a first direction, and detects a change in the magnetic field and thereby detects a displacement of the magnet in the first direction. The magnet includes a transition section in which a ratio of a magnetic volume of the second magnetic-pole region in a second direction to a magnetic volume of the first magnetic-pole region in the second direction gradually varies in the first direction. The second direction is orthogonal to the first direction.
    Type: Application
    Filed: February 22, 2017
    Publication date: September 14, 2017
    Applicant: TDK CORPORATION
    Inventors: Yohei HIROTA, Hiraku HIRABAYASHI, Keisuke UCHIDA, Kazuya WATANABE
  • Publication number: 20170261342
    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 rotary shaft.
    Type: Application
    Filed: March 3, 2017
    Publication date: September 14, 2017
    Inventors: Masaki NAGATA, Hiraku HIRABAYASHI, Yohei HIROTA
  • Publication number: 20170059362
    Abstract: A magnetic field detection apparatus has a first magnetic sensor and a bias magnet positioned to face the first magnetic sensor. The bias magnet has a magnetic pole surface that faces the first magnetic sensor and that applies a bias magnetic field to the first magnetic sensor. The first magnetic sensor detects magnetic field in a first direction that is parallel to the magnetic pole surface. The magnetic pole surface of the bias magnet has a plurality of grooves arranged in the first direction.
    Type: Application
    Filed: August 11, 2016
    Publication date: March 2, 2017
    Inventors: Hiroshi NAGANUMA, Yohei HIROTA, Kunihiro UEDA