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).
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Patent number: 11855035Abstract: 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: GrantFiled: June 29, 2021Date of Patent: December 26, 2023Assignee: TDK CorporationInventors: Yohei Hirota, Hiroshi Yamazaki, Hitoshi Iwama, Yusuke Takahashi
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Publication number: 20230112733Abstract: 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: ApplicationFiled: August 12, 2022Publication date: April 13, 2023Applicant: TDK CORPORATIONInventors: Yohei HIROTA, Naoki OHTA
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Publication number: 20230074404Abstract: 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: ApplicationFiled: November 14, 2022Publication date: March 9, 2023Inventors: Yohei HIROTA, Hayato MIYASHITA, Tsuyoshi UMEHARA, Hiraku HIRABAYASHI
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Patent number: 11519978Abstract: 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: GrantFiled: March 25, 2021Date of Patent: December 6, 2022Assignee: TDK CorporationInventors: Yohei Hirota, Hayato Miyashita, Tsuyoshi Umehara, Hiraku Hirabayashi
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Publication number: 20210327846Abstract: 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: ApplicationFiled: June 29, 2021Publication date: October 21, 2021Inventors: Yohei HIROTA, Hiroshi YAMAZAKI, Hitoshi IWAMA, Yusuke TAKAHASHI
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Patent number: 11088106Abstract: 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: GrantFiled: August 30, 2019Date of Patent: August 10, 2021Assignee: TDK CorporationInventors: Yohei Hirota, Hiroshi Yamazaki, Hitoshi Iwama, Yusuke Takahashi
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Publication number: 20210208216Abstract: 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: ApplicationFiled: March 25, 2021Publication date: July 8, 2021Inventors: Yohei HIROTA, Hayato MIYASHITA, Tsuyoshi UMEHARA, Hiraku HIRABAYASHI
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Patent number: 11009567Abstract: 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: GrantFiled: May 30, 2018Date of Patent: May 18, 2021Assignee: TDK CorporationInventors: Yohei Hirota, Hayato Miyashita, Tsuyoshi Umehara, Hiraku Hirabayashi
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Patent number: 10775195Abstract: 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: GrantFiled: March 3, 2017Date of Patent: September 15, 2020Assignee: TDK CorporationInventors: Masaki Nagata, Hiraku Hirabayashi, Yohei Hirota
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Patent number: 10648787Abstract: 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: GrantFiled: June 27, 2019Date of Patent: May 12, 2020Assignee: TDK CORPORATIONInventors: Yohei Hirota, Homare Tokida, Hiraku Hirabayashi
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Publication number: 20200118963Abstract: 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: ApplicationFiled: August 30, 2019Publication date: April 16, 2020Inventors: Yohei HIROTA, Hiroshi YAMAZAKI, Hitoshi IWAMA, Yusuke TAKAHASHI
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Publication number: 20190316894Abstract: 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: ApplicationFiled: June 27, 2019Publication date: October 17, 2019Applicant: TDK CORPORATIONInventors: Yohei HIROTA, Homare TOKIDA, Hiraku HIRABAYASHI
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Patent number: 10401195Abstract: 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: GrantFiled: February 22, 2017Date of Patent: September 3, 2019Assignee: TDK CORPORATIONInventors: Yohei Hirota, Hiraku Hirabayashi, Keisuke Uchida, Kazuya Watanabe
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Patent number: 10386169Abstract: 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: GrantFiled: June 19, 2014Date of Patent: August 20, 2019Assignee: TDK CORPORATIONInventors: Yohei Hirota, Homare Tokida, Hiraku Hirabayashi
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Publication number: 20190118309Abstract: 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: ApplicationFiled: October 12, 2018Publication date: April 25, 2019Applicant: TDK CORPORATIONInventors: Yohei HIROTA, Hiroshi YAMAZAKI
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Publication number: 20180356473Abstract: 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: ApplicationFiled: May 30, 2018Publication date: December 13, 2018Inventors: Yohei HIROTA, Hayato MIYASHITA, Tsuyoshi UMEHARA, Hiraku HIRABAYASHI
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Patent number: 10082406Abstract: 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: GrantFiled: August 11, 2016Date of Patent: September 25, 2018Assignee: TDK CorporationInventors: Hiroshi Naganuma, Yohei Hirota, Kunihiro Ueda
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Publication number: 20170261346Abstract: 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: ApplicationFiled: February 22, 2017Publication date: September 14, 2017Applicant: TDK CORPORATIONInventors: Yohei HIROTA, Hiraku HIRABAYASHI, Keisuke UCHIDA, Kazuya WATANABE
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Publication number: 20170261342Abstract: 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: ApplicationFiled: March 3, 2017Publication date: September 14, 2017Inventors: Masaki NAGATA, Hiraku HIRABAYASHI, Yohei HIROTA
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Publication number: 20170059362Abstract: 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: ApplicationFiled: August 11, 2016Publication date: March 2, 2017Inventors: Hiroshi NAGANUMA, Yohei HIROTA, Kunihiro UEDA