Patents by Inventor Akira Kikitsu

Akira Kikitsu 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).

  • MAGNETIC RECORDING MEDIUM, METHOD FOR MANUFACTURING RECORDING MEDIUM AND MAGNETIC RECORDING APPARATUS
    Publication number: 20080090002
    Abstract: A magnetic recording layer is formed on an under-layer comprising a Cu crystalline grain layer and a deposited nitrogen atom layer on the Cu crystalline grain layer surface. Then the magnetic recording layer comprising very small average grain diameter and sharp grain diameter distribution is obtained. The magnetic recording medium comprising the magnetic recording layer shows excellent signal to noise ratio at high density recording.
    Type: Application
    Filed: October 17, 2007
    Publication date: April 17, 2008
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tomoyuki Maeda, Akira Kikitsu, Soichi Oikawa, Takeshi Iwasaki
  • Imprint apparatus and method for imprinting
    Patent number: 7343857
    Abstract: An imprint apparatus configured such that it can press a laminate structure in which a magnetic film and a resist film are sequentially laminated on a substrate. The imprint apparatus includes a first press plate configured to mount the laminate structure, a second press plate adapted for sandwiching the laminate structure, a stamper placed on a surface of the second press plate, and has projections and recesses configured to be transferred onto the resist film, and a light source configured to dispose on the same plane as the laminate structure, and is oriented so that the light source can shine the resist film.
    Type: Grant
    Filed: September 30, 2004
    Date of Patent: March 18, 2008
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masatoshi Sakuarai, Akira Kikitsu, Naoko Kihara
  • Magnetic recording media and magnetic recording and reproducing apparatus
    Patent number: 7345838
    Abstract: The present invention relates to a magnetic recording media including servo zones having magnetic or nonmagnetic patterns which are utilized as servo signals including burst marks of a burst section adapted to detect off-track deviation, and data zones, in which the burst marks of the burst section in each of the servo zones are formed of an isolated nonmagnetic material surrounded by a magnetic material.
    Type: Grant
    Filed: August 5, 2005
    Date of Patent: March 18, 2008
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masatoshi Sakurai, Akira Kikitsu, Makoto Asakura
  • Method for Manufacturing Perpendicular Magnetic Recording Medium, Perpendicular Magnetic Recording Medium, and Magnetic Recording/Reproducing Apparatus
    Publication number: 20080037407
    Abstract: One object of the present invention is to provide a perpendicular magnetic recording medium having a high coercive force by annealing, and in order to achieve the object, the present invention provides a method for manufacturing a perpendicular magnetic recording medium comprising a magnetic recording layer deposited on a non-magnetic substrate, in which at least a magnetic layer containing Co and a diffusive layer are stacked each other, and the stacked layers are annealed to produce a magnetic recording layer.
    Type: Application
    Filed: September 15, 2005
    Publication date: February 14, 2008
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Migaku Takahashi, Masahiro Oka, Akira Kikitsu
  • Magnetic recording medium, magnetic recording apparatus and magnetic recording method
    Patent number: 7330335
    Abstract: A magnetic recording medium capable of alleviating thermal fluctuation and improving the recording density includes a functional layer (12) containing a magnetic material, and a recording layer (11) overlying the functional layer and containing a magnetic material. The recording layer contains a plurality of magnetic grains (51) and a nonmagnetic material (52) existing among the magnetic grains, and the functional layer and the recording layer exert exchange coupling interaction in a direction making a substantially orthogonal relation with each other at the room temperature.
    Type: Grant
    Filed: September 22, 2004
    Date of Patent: February 12, 2008
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akira Kikitsu, Tadashi Kai, Junichi Akiyama
  • Magnetic recording medium and method for manufacturing the same
    Patent number: 7323258
    Abstract: A magnetic recording medium which allows high density recording and has excellent durability can be obtained. A magnetic recording medium includes: a plurality of ferromagnetic material dots arranged on a soft magnetic layer formed on a non-magnetic substrate so as to be separated from one another; and carbon films which are formed on the respective ferromagnetic material dots, each carbon film having a smooth film face shape in a section passing through the center of each ferromagnetic material dot and a film thickness gradually decreasing from the center of the ferromagnetic material dot toward an outer edge thereof.
    Type: Grant
    Filed: September 23, 2004
    Date of Patent: January 29, 2008
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoshiyuki Kamata, Yuichi Ohsawa, Hiroyuki Hieda, Akira Kikitsu
  • Method for manufacturing magnetic recording media
    Publication number: 20080014337
    Abstract: According to one embodiment, there is provided a method for manufacturing a magnetic recording media, including forming a magnetic film on a substrate and coating a resist on the magnetic film, imprinting a stamper on the resist to transfer patterns of recesses and protrusions to the resist, and removing the stamper and then performing ion milling to process the magnetic film with resist residues remained in recesses in the patterned resist to form magnetic patterns.
    Type: Application
    Filed: July 3, 2007
    Publication date: January 17, 2008
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Masatoshi Sakurai, Yoshiyuki Kamata, Satoshi Shirotori, Akira Kikitsu
  • Magnetic recording media, magnetic recording apparatus, and stamper
    Patent number: 7319568
    Abstract: A magnetic recording media has a magnetic layer formed on a substrate and includes data regions including a magnetic pattern constituting a recoding track and servo regions including magnetic patterns used as address bits, the data regions and the servo regions being contained in a plane of the magnetic layer. In a case where two magnetic patterns used as address bits on the servo regions corresponding to two adjacent recording tracks are arranged in such a manner that one corner of one of the magnetic patterns is closest to one corner of the other, the corners of the two magnetic patterns are substantially joined together.
    Type: Grant
    Filed: July 15, 2005
    Date of Patent: January 15, 2008
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takeshi Okino, Akira Kikitsu, Yoichiro Tanaka, Yoshiyuki Kamata
  • Magnetic disk apparatus
    Publication number: 20080002269
    Abstract: According to one embodiment, there is provided a magnetic disk apparatus having a magnetic disk having magnetic dot lines each including magnetic dots arrayed at equal intervals in a down track direction, and a read/write head which uses a plurality of adjacent magnetic dot lines as one track and sequentially performs read and write on the magnetic dots included in the magnetic dot lines constituting the track, in which the magnetic dots included in each of the magnetic dot lines in each track of the magnetic disk are displaced in the down track direction from the magnetic dots included in the adjacent dot line in the track depending on a possible skew angle between the read/write head and the track so that the magnetic dots are sequentially accessed by the read/write head.
    Type: Application
    Filed: June 28, 2007
    Publication date: January 3, 2008
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Masatoshi Sakurai, Akira Kikitsu, Kazuto Kashiwagi
  • Magnetic recording media and magnetic recording apparatus
    Publication number: 20080002297
    Abstract: According to one embodiment, there is provided a magnetic recording media including a substrate, and a magnetic recording layer including magnetic film patterns formed in a protruded form on the substrate, sidewalls of the magnetic film patterns having at least two faces of different slope angles.
    Type: Application
    Filed: July 2, 2007
    Publication date: January 3, 2008
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Satosh Shirotori, Masatoshi Sakurai, Yoshiyuki Kamata, Akira Kikitsu
  • Magnetic recording medium, method of fabricating the same, and magnetic recording apparatus
    Publication number: 20080002295
    Abstract: According to one embodiment, there is provided a magnetic recording medium having a data region in which a plurality of recording tracks, each including magnetic dots arrayed in a down-track direction with a pitch p, are formed in a cross-track direction, and a servo region including a preamble in which a plurality of lines of magnetic dots, which are arrayed in a cross-track direction with a pitch p, are formed at equal intervals in the down-track direction.
    Type: Application
    Filed: June 29, 2007
    Publication date: January 3, 2008
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Masatoshi Sakurai, Kazuto Kashiwagi, Akira Kikitsu
  • Method for manufacturing substrate for discrete track recording media and method for manufacturing discrete track recording media
    Patent number: 7314833
    Abstract: According to one embodiment, a method for manufacturing a substrate for a discrete track recording media, the method includes forming an imprint resist layer on a substrate, imprinting, on the imprint resist layer, a stamper formed with patterns of protrusions and recesses corresponding to recording track zones and servo zones to transfer the patterns of protrusions and recesses to the imprint resist layer, removing the stamper from the imprint resist layer, and diffusing liquefied CO2 in a process chamber set at a pressure of 2 to 5 atm, diffusing liquefied H2O in the process chamber set at a pressure of 0.01 to 1 atm, or diffusing a reactive gas selected from a group consisting of liquefied CF4, CHF3, SF6, and C2F6 in the process chamber set at an arbitrary pressure, to jet spray the liquefied gas onto a surface of the substrate.
    Type: Grant
    Filed: June 28, 2006
    Date of Patent: January 1, 2008
    Assignees: Kabushiki Kaisha Toshiba, Showa Denko K.K.
    Inventors: Yoshiyuki Kamata, Katsuyuki Naito, Akira Kikitsu, Masatoshi Sakurai, Masahiro Oka
  • Patterned media, method of manufacturing the same, and magnetic recording/reproducing apparatus
    Publication number: 20070281078
    Abstract: According to one embodiment, a patterned media includes a magnetic film processed into patterns for tracks, servo zones or data zones, and a nonmagnetic filling material filled between patterns of the magnetic film for the tracks, servo zones or data zones and including a base material and a barrier material formed of a metal that does not constitute the base material.
    Type: Application
    Filed: May 30, 2007
    Publication date: December 6, 2007
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Akira Kikitsu, Yoshiyuki Kamata, Masatoshi Sakurai, Satoshi Shirotori
  • Perpendicular Magnetic Recording Medium and Perpendicular Magnetic Recording/Reproducing Apparatus
    Publication number: 20070259214
    Abstract: The invention provides a perpendicular magnetic recording medium in which the recording density is greatly increased with little deviation of the crystal structure. A perpendicular magnetic recording medium has at least a soft magnetic under layer, an orientation control layer, a perpendicular magnetic layer, and a protective layer, which are formed on a nonmagnetic substrate, the orientation control layer consisting of a plurality of layers including a seed layer and an intermediate layer from the substrate side. Preferably, the seed layer and the intermediate layer each have a hexagonal close-packed (hcp) structure, and the average grain size of the seed layer is between 8 nm and 20 nm. The main component of the seed layer is preferably Mg, and the main component of the intermediate layer is preferably Ru.
    Type: Application
    Filed: October 28, 2005
    Publication date: November 8, 2007
    Applicants: MIGAKU TAKAHASHI, SHOWA DENKO K.K., KABUSHIKI KAISHA TOSHIBA
    Inventors: Migaku Takahashi, Masahiro Oka, Akira Kikitsu
  • Magnetic recording media, magnetic recording apparatus, and method for manufacturing magnetic recording media
    Publication number: 20070230055
    Abstract: A magnetic recording media includes a toroidal substrate, a surface thereof is divided into a recording area located in a central part between an outer peripheral edge and an inner peripheral edge, edge areas located within 100 ?m or more and 2,000 ?m or less from the outer and inner peripheral edges, respectively, and adjacent areas located between the edge areas and the recording area, respectively, a magnetic film on the substrate, and a protective film on the magnetic film, in which the magnetic film is thinner in the edge areas than that in the adjacent areas, and at least a part of the protective film in the edge areas is thicker than that in the adjacent areas.
    Type: Application
    Filed: March 22, 2007
    Publication date: October 4, 2007
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Satoshi Shirotori, Masatoshi Sakurai, Akira Kikitsu, Yoshiyuki Kamata, Kaori Kimura
  • Method of manufacturing patterned media
    Publication number: 20070224339
    Abstract: According to one embodiment, there is provided a method of manufacturing a patterned media having a substrate and a magnetic recording layer on the substrate including protruded magnetic patterns and a nonmagnetic material filling recesses between the magnetic patterns. The method includes depositing a first nonmagnetic material to fill the recesses between the magnetic patterns, carrying out surface reforming of the first nonmagnetic material, depositing a second nonmagnetic material on the first nonmagnetic material, and etching back the second and first nonmagnetic materials.
    Type: Application
    Filed: March 22, 2007
    Publication date: September 27, 2007
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yoshiyuki Kamata, Masatoshi Sakurai, Akira Kikitsu, Satoshi Shirotori
  • Optical recording medium having super resolution layer
    Patent number: 7272107
    Abstract: A tool attachable to a spindle of a machine tool in the same way as an ordinary tool, capable of being driven without connecting with an external power supply etc., giving a higher rotational speed than that of the spindle of the machine tool without supplying electric power from the outside, and able to be changed automatically, provided with a machining tool for machining a workpiece, a motor for driving the machining tool, a generator for generating electric power to drive the motor by the rotation of the spindle, and a breaker for breaking a supply line of electric current from the generator to the motor when electric current over a predetermined value flows in the supply line.
    Type: Grant
    Filed: October 6, 2004
    Date of Patent: September 18, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Katsutaro Ichihara, Akira Kikitsu, Toshihiko Nagase
  • Method of forming patterns and method of manufacturing magnetic recording media
    Publication number: 20070090087
    Abstract: According to one embodiment, a method of forming patterns is provided, in which the method including forming a resist on an underlying material, pressing a stamper having patterns of protrusions and recesses, sidewalls of which protrusions are tapered, onto the resist to form a patterned resist having patterns of protrusions and recesses, sidewalls of which protrusions are tapered, forming a protective film on the patterned resist, performing anisotropic etching to leave the protective film on the tapered sidewalls of protrusions of the patterned resist, etching a resist residue remaining in recesses of the patterned resist using the protective film as a mask, and etching the underlying material using the protective film and the patterned resist as a mask.
    Type: Application
    Filed: October 16, 2006
    Publication date: April 26, 2007
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Satoshi Shirotori, Yoshiyuki Kamata, Masatoshi Sakurai, Akira Kikitsu
  • Stamper for magnetic recording media, method of manufacturing magnetic recording media using the same, and method of manufacturing stamper for magnetic recording media
    Publication number: 20070070548
    Abstract: According to one embodiment, a stamper for a magnetic recording media has patterns of protrusions and recesses to manufacture a discrete track recording type magnetic recording media having servo areas including an address portion, a preamble portion and a burst portion, and data areas including a recording track portion, the patterns of protrusions and recesses being formed at a pitch of 400 nm or less, in which a magnitude relation of depths of recesses corresponding to the address portion, the preamble portion, the burst portion and the recording track portion is inverted to a magnitude relation of area ratios of the protrusions to the recesses in the address portion, the preamble portion, the burst portion and the recording track portion.
    Type: Application
    Filed: September 27, 2006
    Publication date: March 29, 2007
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Satoshi Shirotori, Masatoshi Sakurai, Yoshiyuki Kamata, Akira Kikitsu
  • Magnetic recording media and magnetic recording device
    Publication number: 20070070547
    Abstract: According to one embodiment, a magnetic recording media includes a magnetic recording layer formed on a substrate, in which recording tracks and servo areas are prescribed as patterns of protrusions and recesses formed on the magnetic recording layer so that thin film portions of the magnetic recording layer are formed under the recesses, a thickness of magnetic recording layer at the thin film portion is smaller than a thickness of magnetic recording layer at the protrusion in the servo area, and a magnetization direction of the protrusion is antiparallel to a magnetization direction of the thin film in the servo area.
    Type: Application
    Filed: September 27, 2006
    Publication date: March 29, 2007
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yoshiyuki Kamata, Akira Kikitsu, Masatoshi Sakurai