Patents by Inventor Yosuke Antoku
Yosuke Antoku 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: 11353526Abstract: A rotational angle detection device includes a magnet with n pole pairs (where n?3) provided to be integrally rotatable with a rotating body; magnetic detection parts including first and second magnetic detection parts; a corrected signal generation part generating first and second corrected signals; and a rotational angle detection part detecting the rotational angle of the rotating body based on the first and second corrected signals. The waveform of the first and second detection signals have a phase difference of 90° from each other. The corrected signal generation part adds the first sensor signals and adds the second sensor signals. The region at the perimeter of the magnet includes first through nth regions, and at least two of the first and second magnetic sensor parts are positioned in different regions from each other among the first through nth regions.Type: GrantFiled: January 23, 2020Date of Patent: June 7, 2022Assignee: TDK CorporationInventors: Yosuke Antoku, Hiroyuki Hirano, Teiichiro Oka
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Patent number: 11313666Abstract: An angle sensor includes a first magnetic sensor that outputs a first signal, a second magnetic sensor that outputs a second signal, and a processor that performs processing for generating an angle detection value. The processing for generating the angle detection value includes first processing for determining a first candidate value of the angle detection value, second processing for performing processing for determining an (n+1)th candidate value either once or more than once while incrementing n in value by one each time, the (n+1)th candidate value being determined by performing second computing processing using the first and second signals, first and second strengths, and an nth candidate value of the angle detection value, where n is an integer of 1 or more, and third processing for assuming the candidate value last determined by the second processing as the angle detection value.Type: GrantFiled: August 24, 2020Date of Patent: April 26, 2022Assignee: TDK CORPORATIONInventor: Yosuke Antoku
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Patent number: 11099033Abstract: A position detection system includes a first magnet, a first soft ferromagnetic member, and a magnetic detector. The first magnet is magnetized in a first direction and generates a first magnetic field including a first magnetic line. The first soft ferromagnetic member is rectilinearly movable along a second direction and includes a first outer edge having a first outer edge part remote from the first magnet by a first distance in a third direction and a second outer edge part remote from the first magnet by a second distance in the third direction. The first and second outer edge parts are disposed at different positions in the second direction. The magnetic detector is kept at a predetermined constant position relative to the first magnet. The first magnetic line passes through the magnetic detector in the first direction when the first soft ferromagnetic member is at rest.Type: GrantFiled: August 21, 2019Date of Patent: August 24, 2021Assignee: TDK CORPORATIONInventors: Hiroyuki Hirano, Teiichiro Oka, Yosuke Antoku
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Publication number: 20210063135Abstract: An angle sensor includes a first magnetic sensor that outputs a first signal, a second magnetic sensor that outputs a second signal, and a processor that performs processing for generating an angle detection value. The processing for generating the angle detection value includes first processing for determining a first candidate value of the angle detection value, second processing for performing processing for determining an (n+1)th candidate value either once or more than once while incrementing n in value by one each time, the (n+1)th candidate value being determined by performing second computing processing using the first and second signals, first and second strengths, and an nth candidate value of the angle detection value, where n is an integer of 1 or more, and third processing for assuming the candidate value last determined by the second processing as the angle detection value.Type: ApplicationFiled: August 24, 2020Publication date: March 4, 2021Applicant: TDK CORPORATIONInventor: Yosuke ANTOKU
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Publication number: 20200300941Abstract: A rotational angle detection device includes a magnet with n pole pairs (where n?3) provided to be integrally rotatable with a rotating body; magnetic detection parts including first and second magnetic detection parts; a corrected signal generation part generating first and second corrected signals; and a rotational angle detection part detecting the rotational angle of the rotating body based on the first and second corrected signals. The waveform of the first and second detection signals have a phase difference of 90° from each other. The corrected signal generation part adds the first sensor signals and adds the second sensor signals. The region at the perimeter of the magnet includes first through nth regions, and at least two of the first and second magnetic sensor parts are positioned in different regions from each other among the first through nth regions.Type: ApplicationFiled: January 23, 2020Publication date: September 24, 2020Inventors: Yosuke ANTOKU, Hiroyuki HIRANO, Teiichiro OKA
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Publication number: 20200064156Abstract: A position detection system includes a first magnet, a first soft ferromagnetic member, and a magnetic detector. The first magnet is magnetized in a first direction and generates a first magnetic field including a first magnetic line. The first soft ferromagnetic member is rectilinearly movable along a second direction and includes a first outer edge having a first outer edge part remote from the first magnet by a first distance in a third direction and a second outer edge part remote from the first magnet by a second distance in the third direction. The first and second outer edge parts are disposed at different positions in the second direction. The magnetic detector is kept at a predetermined constant position relative to the first magnet. The first magnetic line passes through the magnetic detector in the first direction when the first soft ferromagnetic member is at rest.Type: ApplicationFiled: August 21, 2019Publication date: February 27, 2020Applicant: TDK CORPORATIONInventors: Hiroyuki HIRANO, Teiichiro OKA, Yosuke ANTOKU
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Patent number: 9852751Abstract: This thin film magnetic head includes: a magnetic pole including an end surface exposed on an air bearing surface; and a heating element including a first branch and a second branch and configured to heat a vicinity of the magnetic pole. The first branch and the second branch each expand along a stacking surface and are coupled in parallel to each other. The stacking surface intersects the air bearing surface.Type: GrantFiled: March 14, 2016Date of Patent: December 26, 2017Assignee: TDK CORPORATIONInventors: Katsuki Kurihara, Atsushi Yamaguchi, Yosuke Antoku
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Patent number: 9852755Abstract: This thin film magnetic head includes a magnetic pole including an end surface exposed on an air bearing surface, and a contact detection section including a magnetic material layer provided near the air bearing surface, and a magnetic-domain stabilizing structure stabilizing a magnetic domain structure of the magnetic material layer.Type: GrantFiled: April 28, 2016Date of Patent: December 26, 2017Assignees: TDK CORPORATION, SAE MAGNETICS (H.K.) LTD.Inventors: Katsuki Kurihara, Yosuke Antoku, Norio Takahashi
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Publication number: 20170316798Abstract: This thin film magnetic head includes a magnetic pole including an end surface exposed on an air bearing surface, and a contact detection section including a magnetic material layer provided near the air bearing surface, and a magnetic-domain stabilizing structure stabilizing a magnetic domain structure of the magnetic material layer.Type: ApplicationFiled: April 28, 2016Publication date: November 2, 2017Applicants: TDK CORPORATION, SAE MAGNETICS (H.K.) LTD.Inventors: Katsuki KURIHARA, Yosuke ANTOKU, Norio TAKAHASHI
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Patent number: 9792932Abstract: This thin film magnetic head includes: a magnetic pole including a first end surface exposed on an air bearing surface; a coil configured to provide a magnetic flux passing through inside of the magnetic pole; and a heatsink including a second end surface that is provided at a position recessed from the air bearing surface. The second end surface is configured to suppress reflection causing light that has traveled through an entering position on the air bearing surface to return to the entering position.Type: GrantFiled: March 7, 2016Date of Patent: October 17, 2017Assignee: TDK CORPORATIONInventors: Katsuki Kurihara, Mutsumi Fujita, Yosuke Antoku
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Publication number: 20170263274Abstract: This thin film magnetic head includes: a magnetic pole including an end surface exposed on an air bearing surface; and a heating element including a first branch and a second branch and configured to heat a vicinity of the magnetic pole. The first branch and the second branch each expand along a stacking surface and are coupled in parallel to each other. The stacking surface intersects the air bearing surface.Type: ApplicationFiled: March 14, 2016Publication date: September 14, 2017Applicant: TDK CORPORATIONInventors: Katsuki KURIHARA, Atsushi YAMAGUCHI, Yosuke ANTOKU
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Publication number: 20170256274Abstract: This thin film magnetic head includes: a magnetic pole including a first end surface exposed on an air bearing surface; a coil configured to provide a magnetic flux passing through inside of the magnetic pole; and a heatsink including a second end surface that is provided at a position recessed from the air bearing surface. The second end surface is configured to suppress reflection causing light that has traveled through an entering position on the air bearing surface to return to the entering position.Type: ApplicationFiled: March 7, 2016Publication date: September 7, 2017Applicant: TDK CORPORATIONInventors: Katsuki KURIHARA, Mutsumi FUJITA, Yosuke ANTOKU
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Patent number: 9640205Abstract: A magnetic recording-reproducing head includes, on a support member, a first head section having a function of executing a recording process and having a function of executing a reproducing process, and one or more second head sections each having a function of executing an erasing process and having no function of executing a reproducing process.Type: GrantFiled: March 10, 2016Date of Patent: May 2, 2017Assignee: TDK CORPORATIONInventors: Akimasa Kaizu, Kei Hirata, Yosuke Antoku
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Patent number: 8867168Abstract: A magnetic head includes a main pole, a write shield, and a return path section. The write shield includes first and second shield portions located on opposite sides of the main pole in the track width direction. The return path section includes first and second yoke portions located on opposite sides of the main pole in the track width direction. The first yoke portion is connected to the first shield portion. The second yoke portion is connected to the second shield portion. A coil surrounds at least part of the entire outer periphery of the main pole when viewed from a medium facing surface.Type: GrantFiled: December 7, 2012Date of Patent: October 21, 2014Assignee: TDK CorporationInventors: Norikazu Ota, Masahiro Saito, Taro Oike, Takeo Kagami, Yosuke Antoku, Kenkichi Anagawa, Kenta Hara, Tetsuro Sasaki, Shingo Miyata, Katsuki Kurihara
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Patent number: 8817417Abstract: A trailing shield is provided on a trailing side of a magnetic pole with a non-magnetic gap layer in between, and an intermediate layer having negative uniaxial magnetocrystalline anisotropy is provided between the non-magnetic gap layer and the trailing shield. The intermediate layer has a magnetic property in which an easy axis of magnetization is provided in an in-plane direction and thus magnetization is likely to occur in that direction, whereas a difficult axis of magnetization is provided in a direction intersecting the in-plane direction and thus magnetization is less likely to occur in that direction. Accordingly, magnetic flux becomes difficult to excessively flow from the magnetic pole into the trailing shield.Type: GrantFiled: December 26, 2012Date of Patent: August 26, 2014Assignee: TDK CorporationInventors: Hideyuki Ukita, Kenta Hara, Kenkichi Anagawa, Yosuke Antoku, Masashi Sano, Shuji Okame, Masaya Kato
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Publication number: 20140177104Abstract: A trailing shield is provided on a trailing side of a magnetic pole with a non-magnetic gap layer in between, and an intermediate layer having negative uniaxial magnetocrystalline anisotropy is provided between the non-magnetic gap layer and the trailing shield. The intermediate layer has a magnetic property in which an easy axis of magnetization is provided in an in-plane direction and thus magnetization is likely to occur in that direction, whereas a difficult axis of magnetization is provided in a direction intersecting the in-plane direction and thus magnetization is less likely to occur in that direction. Accordingly, magnetic flux becomes difficult to excessively flow from the magnetic pole into the trailing shield.Type: ApplicationFiled: December 26, 2012Publication date: June 26, 2014Applicant: TDK CORPORATIONInventors: Hideyuki UKITA, Kenta HARA, Kenkichi ANAGAWA, Yosuke ANTOKU, Masashi SANO, Shuji OKAME, Masaya KATO
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Publication number: 20140160597Abstract: A magnetic head includes a main pole, a write shield, and a return path section. The write shield includes first and second shield portions located on opposite sides of the main pole in the track width direction. The return path section includes first and second yoke portions located on opposite sides of the main pole in the track width direction. The first yoke portion is connected to the first shield portion. The second yoke portion is connected to the second shield portion. A coil surrounds at least part of the entire outer periphery of the main pole when viewed from a medium facing surface.Type: ApplicationFiled: December 7, 2012Publication date: June 12, 2014Applicant: TDK CORPORATIONInventors: Norikazu OTA, Masahiro SAITO, Taro OIKE, Takeo KAGAMI, Yosuke ANTOKU, Kenkichi ANAGAWA, Kenta HARA, Tetsuro SASAKI, Shingo MIYATA, Katsuki KURIHARA
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Patent number: 8552328Abstract: The invention provides a method for fixing up the deterioration of a magneto-resistive effect device. A hard disk system is provided in it with a head heating means for heating a thin-film magnetic head, and by that head heating means, a defective site of the magneto-resistive effect device, which occurs as the hard disk system is in operation and is confined in a quasi-stable state, is fixed up in such a way as to return back to its own normal stable state. Thus, the deteriorated site of the magneto-resistive effect device (reproducing device) in the thin-film magnetic head, which is caused by the so-called thermal asperity as the hard disk system is in operation, is fixed up while it remains built in the hard disk system, i.e., without dismantling the hard disk system.Type: GrantFiled: December 28, 2007Date of Patent: October 8, 2013Assignee: TDK CorporationInventors: Takumi Yanagisawa, Yosuke Antoku, Yoshikazu Sawada
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Patent number: 8542456Abstract: A magnetic head includes a medium facing surface that faces a surface of a recording medium, a write head section, a contact sensor that detects contact of the medium facing surface with the surface of the recording medium, and a heat sink adjacent to the contact sensor. The write head section has a magnetic pole that produces a write magnetic field for writing data on the recording medium. The contact sensor and the heat sink have respective end faces located in the medium facing surface. The contact sensor varies in resistance in response to temperature variations, and is to be energized. The heat sink includes an intermediate layer made of a nonmagnetic metal material, and two ferromagnetic layers made of a metal-based magnetic material, the two ferromagnetic layers being disposed with the intermediate layer therebetween, and being antiferromagnetically exchange-coupled to each other via the intermediate layer.Type: GrantFiled: August 25, 2011Date of Patent: September 24, 2013Assignee: TDK CorporationInventors: Takekazu Yamane, Yosuke Antoku, Katsuki Kurihara, Norio Takahashi, Kenzo Makino
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Publication number: 20130050867Abstract: A magnetic head includes a medium facing surface that faces a surface of a recording medium, a write head section, a contact sensor that detects contact of the medium facing surface with the surface of the recording medium, and a heat sink adjacent to the contact sensor. The write head section has a magnetic pole that produces a write magnetic field for writing data on the recording medium. The contact sensor and the heat sink have respective end faces located in the medium facing surface. The contact sensor varies in resistance in response to temperature variations, and is to be energized. The heat sink includes an intermediate layer made of a nonmagnetic metal material, and two ferromagnetic layers made of a metal-based magnetic material, the two ferromagnetic layers being disposed with the intermediate layer therebetween, and being antiferromagnetically exchange-coupled to each other via the intermediate layer.Type: ApplicationFiled: August 25, 2011Publication date: February 28, 2013Applicant: TDK CORPORATIONInventors: Takekazu YAMANE, Yosuke ANTOKU, Katsuki KURIHARA, Norio TAKAHASHI, Kenzo MAKINO