Patents by Inventor Atsuko Kuroda

Atsuko Kuroda 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: 7370405
    Abstract: A thin film magnetic head for perpendicular recording of a single-pole type has a flux enhanced part and a flux enhanced end arranged on a leading side of the main pole in parallel with the cross track direction. The side surface of the main pole intersecting the cross track direction is arranged on the track center side perpendicular to the track width. The field gradient of a perpendicular magnetic field on the trailing side of the main pole and near both ends of the track is made steep to realize a higher areal recording density. The head is fabricated by forming a first resist pattern on an inorganic insulating layer. A slope is formed on the inorganic insulating layer with the resist pattern as a mask. A second resist pattern is then formed on the inorganic insulating layer to form a magnetic layer on the inorganic insulating layer.
    Type: Grant
    Filed: March 15, 2005
    Date of Patent: May 13, 2008
    Assignee: Hitachi Global Storage Technologies Japan, Ltd.
    Inventors: Atsuko Kuroda, Masafumi Mochizuki
  • Patent number: 6952380
    Abstract: A vertical magnetic recording apparatus is provided which can diminish thermal decay of magnetization to ensure a high reliability of the life of recorded information and which can stably effect the write of magnetic information. Light assist is performed by obliquely applying light to a gap between a main pole of a vertical recording head and a medium. The light is radiated from the head side of the apparatus with respect to the medium. Utilizing the present invention, the thermal decay of magnetization at room temperature is diminished, the life of the recorded information is increased, and the storage reliability of the disk is increased.
    Type: Grant
    Filed: May 6, 2002
    Date of Patent: October 4, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Fumio Isshiki, Atsuko Kuroda, Takayuki Ichihara, Masafumi Mochizuki, Takuya Matsumoto
  • Publication number: 20050157424
    Abstract: A thin film magnetic head for perpendicular recording of a single-pole type has a flux enhanced part and a flux enhanced end arranged on a leading side of the main pole parallel with the cross track direction. The side surface of the main pole intersecting the cross track direction is arranged on the track center side perpendicular to the track width. The field gradient of a perpendicular magnetic field on the trailing side of the main pole and near both ends of the track is made steep to realize a higher areal recording density. The head is fabricated by forming a first resist pattern on an inorganic insulating layer. A slope is formed on the inorganic insulating layer with the resist pattern as a mask. A second resist pattern is then formed on the inorganic insulating layer to form a magnetic layer on the inorganic insulating layer.
    Type: Application
    Filed: March 15, 2005
    Publication date: July 21, 2005
    Inventors: Atsuko Kuroda, Masafumi Mochizuki
  • Publication number: 20040218307
    Abstract: Arrangement of the flux enhanced part and the flux enhanced end of a main pole and the front or side surface of the main pole of a single-pole head for perpendicular recording is considered to prevent the influence of the leakage magnetic field from those parts and to enhance a field gradient in a portion for writing the boundary of a bit cell into a recording layer in a profile of a perpendicular magnetic field. A flux enhanced part 26 and a flux enhanced end 39 of a main pole are arranged on a leading side 25 rather than a vertical plane 36 in parallel with the cross track direction including the trailing edge of an air bearing surface of the main pole. Further, the front surface on the trailing side of the main pole is arranged on the leading side rather than the vertical plane.
    Type: Application
    Filed: June 8, 2004
    Publication date: November 4, 2004
    Applicant: Hitachi, Ltd.
    Inventors: Atsuko Kuroda, Masafumi Mochizuki
  • Patent number: 6775099
    Abstract: A thin film magnetic head for perpendicular recording of a single-pole type has a flux enhanced part and a flux enhanced end of a main pole arranged on a leading side of the main pole in parallel with the cross track direction. The side surface of the main pole intersecting the cross track direction of the main pole is arranged on the track center side perpendicular to the track width. The field gradient of a perpendicular magnetic field on the trailing side of the main pole and near both ends of the track is made steep to realize a higher areal recording density as a result.
    Type: Grant
    Filed: February 19, 2002
    Date of Patent: August 10, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Atsuko Kuroda, Masafumi Mochizuki
  • Publication number: 20030043699
    Abstract: A vertical magnetic recording apparatus is provided which can diminish thermal decay of magnetization to ensure a high reliability of the life of recorded information and which can stably effect the write of magnetic information. Light assist is performed by obliquely applying light to a gap between a main pole of a vertical recording head and a medium. The light is radiated from the head side of the apparatus with respect to the medium. Utilizing the present invention, the thermal decay of magnetization at room temperature is diminished, the life of the recorded information is increased, and the storage reliability of the disk is increased.
    Type: Application
    Filed: May 6, 2002
    Publication date: March 6, 2003
    Applicant: Hitachi, Ltd.
    Inventors: Fumio Isshiki, Atsuko Kuroda, Takayuki Ichihara, Masafumi Mochizuki, Takuya Matsumoto
  • Publication number: 20030021063
    Abstract: Arrangement of the flux enhanced part and the flux enhanced end of a main pole and the front or side surface of the main pole of a single-pole head for perpendicular recording is considered to prevent the influence of the leakage magnetic field from those parts and to enhance a field gradient in a portion for writing the boundary of a bit cell into a recording layer in a profile of a perpendicular magnetic field. A flux enhanced part 26 and a flux enhanced end 39 of a main pole are arranged on a leading side 25 rather than a vertical plane 36 in parallel with the cross track direction including the trailing edge of an air bearing surface of the main pole. Further, the front surface on the trailing side of the main pole is arranged on the leading side rather than the vertical plane.
    Type: Application
    Filed: February 19, 2002
    Publication date: January 30, 2003
    Inventors: Atsuko Kuroda, Masafumi Mochizuki