Patents by Inventor Katsuki Kurihara

Katsuki Kurihara 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).

  • Publication number: 20200238444
    Abstract: A welding material for austenitic heat resistant steel is provided that has a chemical composition which consists of, by mass %, C: 0.06 to 0.14%, Si: 0.10 to 0.40%, Mn: 2.0 to 4.0%, P: 0.020% or less, Cu: 2.0 to 4.0%, Ni: 15.0 to 19.0%, Cr: 16.0 to 20.0%, Mo: 0.50 to 1.50%, Nb: 0.30 to 0.60%, N: 0.10 to 0.30%, Al: 0.030% or less, O: 0.020% or less, S: 0 to 0.0030%, Sn: 0 to 0.0030%, Bi: 0 to 0.0030%, Zn: 0 to 0.0030%, Sb: 0 to 0.0030%, As: 0 to 0.0030%, V: 0 to 0.50%, Ti: 0 to 0.50%, Ta: 0 to 0.50%, Co: 0 to 2.0%, B: 0 to 0.020%, Ca: 0 to 0.020%, Mg: 0 to 0.020%, REM: 0 to 0.06%, with the balance being Fe and impurities, and which contains two or more types of element selected from S, Sn, Bi, Zn, Sb and As within a range that satisfies [0.0005?S+Sn+Bi+Zn+Sb+As?0.0030].
    Type: Application
    Filed: October 3, 2018
    Publication date: July 30, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Hiroyuki HIRATA, Kana JOTOKU, Shinnosuke KURIHARA, Katsuki TANAKA
  • Patent number: 9852755
    Abstract: 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: Grant
    Filed: April 28, 2016
    Date of Patent: December 26, 2017
    Assignees: TDK CORPORATION, SAE MAGNETICS (H.K.) LTD.
    Inventors: Katsuki Kurihara, Yosuke Antoku, Norio Takahashi
  • Patent number: 9852751
    Abstract: 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: Grant
    Filed: March 14, 2016
    Date of Patent: December 26, 2017
    Assignee: TDK CORPORATION
    Inventors: Katsuki Kurihara, Atsushi Yamaguchi, Yosuke Antoku
  • Publication number: 20170316798
    Abstract: 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: Application
    Filed: April 28, 2016
    Publication date: November 2, 2017
    Applicants: TDK CORPORATION, SAE MAGNETICS (H.K.) LTD.
    Inventors: Katsuki KURIHARA, Yosuke ANTOKU, Norio TAKAHASHI
  • Patent number: 9792932
    Abstract: 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: Grant
    Filed: March 7, 2016
    Date of Patent: October 17, 2017
    Assignee: TDK CORPORATION
    Inventors: Katsuki Kurihara, Mutsumi Fujita, Yosuke Antoku
  • Publication number: 20170263274
    Abstract: 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: Application
    Filed: March 14, 2016
    Publication date: September 14, 2017
    Applicant: TDK CORPORATION
    Inventors: Katsuki KURIHARA, Atsushi YAMAGUCHI, Yosuke ANTOKU
  • Publication number: 20170256274
    Abstract: 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: Application
    Filed: March 7, 2016
    Publication date: September 7, 2017
    Applicant: TDK CORPORATION
    Inventors: Katsuki KURIHARA, Mutsumi FUJITA, Yosuke ANTOKU
  • Patent number: 8867168
    Abstract: 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: Grant
    Filed: December 7, 2012
    Date of Patent: October 21, 2014
    Assignee: TDK Corporation
    Inventors: Norikazu Ota, Masahiro Saito, Taro Oike, Takeo Kagami, Yosuke Antoku, Kenkichi Anagawa, Kenta Hara, Tetsuro Sasaki, Shingo Miyata, Katsuki Kurihara
  • Publication number: 20140160597
    Abstract: 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: Application
    Filed: December 7, 2012
    Publication date: June 12, 2014
    Applicant: TDK CORPORATION
    Inventors: Norikazu OTA, Masahiro SAITO, Taro OIKE, Takeo KAGAMI, Yosuke ANTOKU, Kenkichi ANAGAWA, Kenta HARA, Tetsuro SASAKI, Shingo MIYATA, Katsuki KURIHARA
  • Patent number: 8542456
    Abstract: 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: Grant
    Filed: August 25, 2011
    Date of Patent: September 24, 2013
    Assignee: TDK Corporation
    Inventors: Takekazu Yamane, Yosuke Antoku, Katsuki Kurihara, Norio Takahashi, Kenzo Makino
  • Patent number: 8493818
    Abstract: A thermally-assisted magnetic recording head, includes: a pole that generates a writing magnetic field from an end surface that forms a portion of an air bearing surface opposing a magnetic recording medium; a waveguide through which light for exciting a surface plasmon propagates; a plasmon generator that couples to the light in a surface plasmon mode and generates near-field light from a near-field light generating portion on a near-field light generating end surface that forms the portion of the air bearing surface; and magnetic field focusing parts that are able to focus the writing magnetic field generated from the pole and that are disposed on both sides of the pole in a track width direction from a perspective of the air bearing surface side.
    Type: Grant
    Filed: July 14, 2011
    Date of Patent: July 23, 2013
    Assignee: TDK Corporation
    Inventors: Satoshi Tomikawa, Tomohito Mizuno, Katsuki Kurihara
  • Publication number: 20130050867
    Abstract: 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: Application
    Filed: August 25, 2011
    Publication date: February 28, 2013
    Applicant: TDK CORPORATION
    Inventors: Takekazu YAMANE, Yosuke ANTOKU, Katsuki KURIHARA, Norio TAKAHASHI, Kenzo MAKINO
  • Patent number: 8374062
    Abstract: The magnetic read write head has a read head and a write head, each having an end face exposed on an air bearing surface. The write head performs heat assist magnetic recording, and is provided with: a magnetic pole having an end face exposed on the air bearing surface; a waveguide extending toward the air bearing surface to propagate light; and a plasmon generator provided between the magnetic pole and the waveguide, and generating near-field light based on the light propagated through the waveguide to emit the generated near-field light from the air bearing surface. The waveguide is surrounded by a clad layer, and the magnetic pole is in contact with a heat sink having a heat conductivity higher than that of the clad layer. Although the near-field light causes temperature rise, heat energy from the plasmon generator to the magnetic pole is released through the heat sink.
    Type: Grant
    Filed: September 23, 2010
    Date of Patent: February 12, 2013
    Assignee: TDK Corporation
    Inventors: Kosuke Tanaka, Tetsuya Roppongi, Daisuke Miyauchi, Katsuki Kurihara
  • Publication number: 20130016592
    Abstract: A thermally-assisted magnetic recording head, includes: a pole that generates a writing magnetic field from an end surface that forms a portion of an air bearing surface opposing a magnetic recording medium; a waveguide through which light for exciting a surface plasmon propagates; a plasmon generator that couples to the light in a surface plasmon mode and generates near-field light from a near-field light generating portion on a near-field light generating end surface that forms the portion of the air bearing surface; and magnetic field focusing parts that are able to focus the writing magnetic field generated from the pole and that are disposed on both sides of the pole in a track width direction from a perspective of the air bearing surface side.
    Type: Application
    Filed: July 14, 2011
    Publication date: January 17, 2013
    Applicant: TDK CORPORATION
    Inventors: Satoshi TOMIKAWA, Tomohito Mizuno, Katsuki Kurihara
  • Patent number: 8325567
    Abstract: Provided is a thermally-assisted magnetic recording head capable of setting the near-field light (NFL-) emission point to be sufficiently close to the write-field-generating portion. The head comprises a magnetic pole, a waveguide propagating light, and a NFL-generator coupled with the light in surface plasmon mode. The NFL-generator comprises a propagation edge extending to the NFL-generating end surface, at least a portion of the propagation edge being opposed to the waveguide with a distance, and the magnetic pole has a surface contact with a surface portion of the NFL-generator including no propagation edge. Therefore, the distance between the magnetic-pole end surface and the NFL-generating end surface becomes zero. The propagation edge is not contacted with the magnetic pole. Accordingly, the surface plasmon can propagate along on the propagation edge without being absorbed by the pole. Thus, the NFL-emission point is ensured to be at the end point of the propagation edge.
    Type: Grant
    Filed: September 10, 2009
    Date of Patent: December 4, 2012
    Assignee: TDK Corporation
    Inventors: Daisuke Miyauchi, Tsutomu Chou, Kosuke Tanaka, Susumu Aoki, Tetsuya Roppongi, Katsuki Kurihara
  • Patent number: 8300359
    Abstract: A perpendicular magnetic write head includes: a magnetic pole; a pair of side shields on both sides, in a write-track width direction, of the magnetic pole with respective side gaps in between; a trailing shield on a trailing side of the magnetic pole and the pair of side shields with a trailing gap in between. Each of the magnetic pole, the side shield, the trailing shield, the side gap, and the trailing gap has an end face exposed on an air bearing surface. The trailing gap has a first regional part and a second regional part. The first regional part separates a trailing edge of the magnetic pole from the trailing shield, and the second regional part separates the pair of side shields from the trailing shield. All or a part of the second regional part has a thickness larger than a thickness of the first regional part.
    Type: Grant
    Filed: December 30, 2009
    Date of Patent: October 30, 2012
    Assignee: TDK Corporation
    Inventors: Kei Hirata, Katsuki Kurihara, Kenkichi Anagawa, Takeo Kagami
  • Patent number: 8233237
    Abstract: A main magnetic-pole layer is provided with, at the tip end portion thereof, a trailing shied on the trailing side via a non-magnetic gap layer, and the non-magnetic gap layer includes therein one or more magnetic layers. This magnetic layer appropriately controls the amount of magnetic fluxes coming from the tip end portion of the main magnetic-pole layer for capturing into the trailing shield because the magnetic fluxes coming from the tip end portion of the main magnetic-pole layer go through the magnetic layer before being captured into the trailing shield.
    Type: Grant
    Filed: June 21, 2010
    Date of Patent: July 31, 2012
    Assignee: TDK Corporation
    Inventors: Kenkichi Anagawa, Katsuki Kurihara, Takeo Kagami, Kei Hirata, Minoru Ota
  • Patent number: 8213117
    Abstract: A magnetic head includes a reproducing element for reproducing information recorded on a magnetic recording medium, a recording element for recording information on the magnetic recording medium, and a heating resistor. The magnetic head has a magnetic medium-facing surface on which the reproducing element and the recording element are exposed.
    Type: Grant
    Filed: June 4, 2010
    Date of Patent: July 3, 2012
    Assignee: TDK Corporation
    Inventors: Yosuke Antoku, Norio Takahashi, Katsuki Kurihara
  • Patent number: 8208349
    Abstract: A thermally-assisted magnetic recording head includes a waveguide, a near-field optical device which emits near-field light from a near-field-light-generating end surface that forms a portion of an opposed-to-medium surface, and a magnetic pole generates write field from its end on the opposed-to-medium surface side. The near-field optical device includes a contact-to-waveguide surface, and a propagation edge configured to propagate there on the surface plasmon excited by the light. A gap between a near-field optical device-opposed surface of the magnetic pole and the propagation edge of the near-field optical device is larger at a section far from the end on the opposed-to-medium surface side than that at a section near the opposed-to-medium surface side.
    Type: Grant
    Filed: January 15, 2010
    Date of Patent: June 26, 2012
    Assignee: TDK Corporation
    Inventors: Kosuke Tanaka, Daisuke Miyauchi, Susumu Aoki, Tetsuya Roppongi, Tsutomu Chou, Takahiko Izawa, Katsuki Kurihara
  • Publication number: 20120075965
    Abstract: The magnetic read write head has a read head and a write head, each having an end face exposed on an air bearing surface. The write head performs heat assist magnetic recording, and is provided with: a magnetic pole having an end face exposed on the air bearing surface; a waveguide extending toward the air bearing surface to propagate light; and a plasmon generator provided between the magnetic pole and the waveguide, and generating near-field light based on the light propagated through the waveguide to emit the generated near-field light from the air bearing surface. The waveguide is surrounded by a clad layer, and the magnetic pole is in contact with a heat sink having a heat conductivity higher than that of the clad layer. Although the near-field light causes temperature rise, heat energy from the plasmon generator to the magnetic pole is released through the heat sink.
    Type: Application
    Filed: September 23, 2010
    Publication date: March 29, 2012
    Applicant: TDK CORPORATION
    Inventors: Kosuke TANAKA, Tetsuya ROPPONGI, Daisuke MIYAUCHI, Katsuki KURIHARA