Patents by Inventor Masatoshi Sakurai

Masatoshi Sakurai 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).

  • STAMPER MANUFACTURING METHOD
    Publication number: 20100155365
    Abstract: According to one embodiment, when forming first, second, and third stampers by transferring three-dimensional patterns of a master, a height adjusting layer having a film thickness greater on the upper surface of a projection than on the bottom surface of a recess is formed between the second stamper and a second release layer, and the surface of the third stamper is etched with an acidic solution having a pH of less than 3.
    Type: Application
    Filed: December 17, 2009
    Publication date: June 24, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Takuya SHIMADA, Shinobu SUGIMURA, Yoshiyuki KAMATA, Masatoshi SAKURAI
  • MAGNETIC RECORDING MEDIUM MANUFACTURING METHOD
    Publication number: 20100159281
    Abstract: According to one embodiment, an ultraviolet-curable resin material to be used contains a monomer represented by formula (1) presented earlier, a resin stamper is used as a stamper, and the surface of a magnetic recording layer and the three-dimensional pattern surface of the resin stamper are contacted in a vacuum.
    Type: Application
    Filed: December 21, 2009
    Publication date: June 24, 2010
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Seiji Morita, Kazuyo Umezawa, Shinobu Sugimura, Masatoshi Sakurai
  • Method and apparatus for manufacturing patterned media
    Patent number: 7740767
    Abstract: According to one embodiment, a method for manufacturing a patterned media includes forming patterns of a magnetic layer having protrusions and recesses corresponding to tracks, servo zones or data zones on a substrate having a center hole, and spraying gas flow produced by diffusing a liquid gas toward the center hole of the substrate before or after forming the patterns of the magnetic layer.
    Type: Grant
    Filed: June 22, 2006
    Date of Patent: June 22, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Akira Kikitsu, Yoshiyuki Kamata, Satoshi Shirotori, Masatoshi Sakurai
  • METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM
    Publication number: 20100147791
    Abstract: According to one embodiment, a method of manufacturing a magnetic recording medium includes forming a first hard mask, a second hard mask and a resist film on a magnetic recording layer, imprinting a stamper on the resist film to transfer patterns of recesses and protrusions, removing residues remained in recess of the patterned resist film, etching the second hard mask using the patterned resist film as a mask to transfer patterns of recesses and protrusions, etching the first hard mask using the patterned second hard mask as a mask to transfer patterns of recesses and protrusions, and deactivating magnetism of the magnetic recording layer exposed in the recesses together with removing the second hard mask by ion-beam etching.
    Type: Application
    Filed: December 11, 2009
    Publication date: June 17, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yousuke ISOWAKI, Kaori KIMURA, Yoshiyuki KAMATA, Masatoshi SAKURAI
  • STAMPER, STAMPER TESTING METHOD, AND STAMPER TESTING APPARATUS
    Publication number: 20100148095
    Abstract: According to one embodiment, a stamper has a data area and servo area, and has concentric or spiral grooves formed in the data area.
    Type: Application
    Filed: August 10, 2009
    Publication date: June 17, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kazuyo Umezawa, Seiji Morita, Masatoshi Sakurai
  • Magnetic disk medium, reticle and magnetic recording and reproducing apparatus
    Patent number: 7738213
    Abstract: A magnetic disc medium according to an aspect of the present invention includes: a preamble part in a servo area of each of sectors obtained by dividing a surface of the medium in a circumference direction, the preamble part including strip-shaped patterns formed of a plurality of magnetic materials, and each of the strip-shaped patterns formed of the magnetic materials being divided by non-magnetic materials at periodic intervals.
    Type: Grant
    Filed: June 8, 2006
    Date of Patent: June 15, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takeshi Okino, Seiji Morita, Masatoshi Sakurai, Shinobu Sugimura
  • Magnetic recording medium Formatted with ROM and RAM regions
    Patent number: 7738203
    Abstract: A magnetic recording medium has a RAM region and a ROM region. The RAM region includes a plurality of first tracks each having a first magnetic portion. The first magnetic portions in adjacent tracks are separated from each other. The ROM region includes a plurality of second tracks each having a second magnetic portion. A width of the second magnetic portions in a direction perpendicular to a track direction of the first tracks is larger than that of the first magnetic portions in the perpendicular direction.
    Type: Grant
    Filed: March 30, 2005
    Date of Patent: June 15, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masatoshi Sakurai, Seiji Morita, Akira Kikitsu, Yoshiyuki Kamata
  • STAMPER
    Publication number: 20100143517
    Abstract: According to one embodiment, a stamper has three-dimensional patterns in a dummy region. The three-dimensional patterns have a repeatable run out of 1 nm or less between the 15th and 40th orders when the rotational frequency is the first order as a reference.
    Type: Application
    Filed: August 10, 2009
    Publication date: June 10, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kazuyo Umezawa, Seiji Morita, Masatoshi Sakurai
  • Stamper for magnetic recording media, method of manufacturing magnetic recording media using the same, and method of manufacturing stamper for magnetic recording media
    Patent number: 7708543
    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: Grant
    Filed: September 27, 2006
    Date of Patent: May 4, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Satoshi Shirotori, Masatoshi Sakurai, Yoshiyuki Kamata, Akira Kikitsu
  • MAGNETIC RECORDING MEDIUM AND METHOD OF MANUFACTURING THE SAME
    Publication number: 20100084374
    Abstract: According to one embodiment, a method of manufacturing a magnetic recording medium comprises forming a protective film on a ferromagnetic recording layer containing Cobalt (Co) on a substrate and forming a recess in both the protective film and the ferromagnetic recording layer at a part where a nonmagnetic layer is to be formed. The method further comprises removing Co from a part of the recess of the ferromagnetic recording layer to form the nonmagnetic layer that separates magnetic patterns made of the ferromagnetic recording layer containing Co. The nonmagnetic layer has an identical chemical composition as the ferromagnetic recording layer, except for the nonmagnetic layer having a lower Co concentration than the magnetic patterns.
    Type: Application
    Filed: December 15, 2009
    Publication date: April 8, 2010
    Inventors: Kaori Kimura, Yoshiyuki Kamata, Satoshi Shirotori, Masatoshi Sakurai
  • Surveying apparatus
    Patent number: 7669340
    Abstract: A surveying apparatus is provided that includes a telescope block, a support block, and an imaging unit. The telescope block includes a sighting telescope and is rotatably supported about a first axis. The support block rotatably supports the telescope block about the first axis. The imaging unit is provided inside the telescope block. The imaging unit comprises an image-display device and at least one of an image data output device and an image data recording device.
    Type: Grant
    Filed: July 2, 2007
    Date of Patent: March 2, 2010
    Assignee: Pentax Industrial Instruments Co., Ltd.
    Inventors: Shunji Matsuo, Homu Takayama, Takanori Yachi, Masatoshi Sakurai
  • METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING MEDIUM
    Publication number: 20100047625
    Abstract: According to one embodiment, a method of manufacturing a magnetic recording medium includes forming a resist on a magnetic recording layer, imprinting a stamper to the resist to transfer patterns of protrusions and recesses, and partially etching the magnetic recording layer in areas not covered with patterns of the resist used as masks by ion beam etching using a mixed gas of He and N2 as well as modifying a remainder of the magnetic recording layer to leave behind a nonmagnetic layer having a reduced thickness.
    Type: Application
    Filed: August 20, 2009
    Publication date: February 25, 2010
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Yoshiyuki KAMATA, Kaori KIMURA, Yousuke ISOWAKI, Masatoshi SAKURAI
  • Method for producing magnetic recording medium
    Patent number: 7662264
    Abstract: A method for producing a magnetic recording medium, includes: forming an SOG film on a surface of a magnetic layer; forming a concavo-convex structure in the SOG film comprising one selected from a group consisting of silica glass, alkylsiloxane polymer, methyl silsesquioxane polymer, hydrogen silsesquioxane polymer and hydro alkylsiloxane polymer; etching the SOG film to expose the surface of the magnetic layer; etching the exposed surface of the magnetic layer by ion milling; and forming a filling layer on the surface of the magnetic layer while leaving a portion of the magnetic layer having been subjected to the ion milling.
    Type: Grant
    Filed: April 19, 2006
    Date of Patent: February 16, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Satoshi Shirotori, Yoshiyuki Kamata, Masatoshi Sakurai
  • METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM
    Publication number: 20100018946
    Abstract: According to one embodiment, a method of manufacturing a magnetic recording medium includes forming a hard mask and a resist on a magnetic recording layer, imprinting a stamper on the resist to transfer patterns of protrusions and recesses, removing resist residues left in the recesses of the patterned resist, etching the hard mask using the patterned resist as a mask to transfer the patterns of protrusions and recesses, stripping the resist, and performing ion beam etching to remove the remaining hard mask and to modify a surface of the magnetic recording layer uncovered with the remaining hard mask.
    Type: Application
    Filed: July 23, 2009
    Publication date: January 28, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yousuke Isowaki, Kaori Kimura, Yoshiyuki Kamata, Masatoshi Sakurai
  • METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM
    Publication number: 20100018947
    Abstract: According to one embodiment, a method of manufacturing a magnetic recording medium includes forming a magnetic recording layer, an oxidation inhibiting layer, a hard mask layer includes carbon on a substrate, coating the hard mask layer with a resist, transferring patterns of protrusions and recesses to the resist by imprinting to form resist patterns, sequentially performing etching of the hard mask layer using the resist patterns as masks, etching of the oxidation inhibiting layer, and etching and/or magnetism deactivation of the magnetic recording layer to form patterns of the magnetic recording layer, and sequentially performing stripping of the resist patterns, stripping of the hard mask layer and stripping of the oxidation inhibiting layer, in which ion beam etching is used for stripping the oxidation inhibiting layer.
    Type: Application
    Filed: July 24, 2009
    Publication date: January 28, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kaori Kimura, Yousuke Isowaki, Yoshiyuki Kamata, Masatoshi Sakurai
  • METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM
    Publication number: 20100006537
    Abstract: According to one embodiment, a method of manufacturing a magnetic recording medium includes depositing a magnetic recording layer on a substrate, the magnetic recording layer having a multi-layered structure of two or more layers at least one layer of which has a granular structure including CoCrPt alloy and SiO2, TiO2, CrO2, CoO2 or Ta2O5, forming masks on areas corresponding to recording regions of the magnetic recording layer, partially etching the magnetic recording layer in areas not covered with the masks with an etching gas to expose the granular layer of the magnetic recording layer and to form protrusions and recesses on the magnetic recording layer, modifying the granular layer of the magnetic recording layer remaining in the recesses with modifying gas, promoting modification reaction to form non-recording regions, and forming a protective film on an entire surface.
    Type: Application
    Filed: September 16, 2009
    Publication date: January 14, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yoshiyuki KAMATA, Akira KIKITSU, Yosuke ISOWAKI, Kaori KIMURA, Satoshi SHIROTORI, Masatoshi SAKURAI
  • METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM
    Publication number: 20100000966
    Abstract: According to one embodiment, a method of manufacturing a magnetic recording medium includes depositing a magnetic recording layer on a substrate, forming masks on areas corresponding to recording regions of the magnetic recording layer, partially etching the magnetic recording layer in areas not covered with the masks with an etching gas to form protrusions and recesses on the magnetic recording layer, modifying the magnetic recording layer remaining in the recesses with Ne gas to form non-recording regions, and forming a protecting film on an entire surface.
    Type: Application
    Filed: September 16, 2009
    Publication date: January 7, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yoshiyuki KAMATA, Yosuke ISOWAKI, Kaori KIMURA, Satoshi SHIROTORI, Masatoshi SAKURAI
  • METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM
    Publication number: 20100000965
    Abstract: According to one embodiment, a method of manufacturing a magnetic recording medium includes depositing a magnetic recording layer on a substrate, forming masks on areas corresponding to recording regions of the magnetic recording layer, partially etching the magnetic recording layer in areas not covered with the masks with an etching gas to form protrusions and recesses on the magnetic recording layer, modifying the magnetic recording layer remaining in the recesses with a modifying gas to form non-recording regions, and forming a protecting film on an entire surface.
    Type: Application
    Filed: September 11, 2009
    Publication date: January 7, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yoshiyuki KAMATA, Yosuke ISOWAKI, Kaori KIMURA, Satoshi SHIROTORI, Masatoshi SAKURAI
  • METHOD AND APPARATUS FOR MANUFACTURING PLATE-LIKE STRUCTURE
    Publication number: 20090321000
    Abstract: A method for manufacturing a plate-like structure, the method including a step of transferring concave and convex patterns on a master to a surface of a transferred substrate by sandwiching the master provided with the concave and convex patterns and the transferred substrate, between a press surface of a hollow cylindrical upper and a press surface of a lower mold, and pressurizing central parts of the upper and lower molds to apply pressure to the master and the transferred substrate, wherein a compressive load imposed on inner peripheral portions of the upper and lower molds is blocked and distributed toward outer peripheries of the upper and lower molds.
    Type: Application
    Filed: September 1, 2009
    Publication date: December 31, 2009
    Inventors: Ryoichi TAKAHASHI, Masatoshi Sakurai
  • METHOD OF MANUFACTURING STAMPER
    Publication number: 20090314648
    Abstract: According to one embodiment, a method of manufacturing a stamper used for manufacturing a magnetic recording medium having magnetic patterns corresponding to servo areas including a preamble section, an address section and a burst section and data areas including discrete tracks, the method includes forming additional resist patterns such that protrusions and recesses appear alternately in the radial direction in the preamble section and/or address section, in forming resist patterns corresponding to the servo areas including the preamble section, the address section and the burst section and data areas including discrete tracks are formed on a master plate, depositing a conductive film on the entire surface of the master plate and resist patterns, followed by electroforming a metal layer, and peeling off the metal layer from the master plate.
    Type: Application
    Filed: June 23, 2009
    Publication date: December 24, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Ryoichi Takahashi, Masatoshi Sakurai