Patents by Inventor Koichi Wago

Koichi Wago 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: 7889616
    Abstract: A polarization detection system structured for optical read-out of disc-shaped optical data/information storage and retrieval media with surfaces comprised of pits or marks configured as multilevel oriented nano-structures (ONS) with varying pit or mark orientations and widths. The polarization detection system comprises: an optical beam source; a stage for mounting and rotating an optical disc medium about a central axis; at least one photodetector; a beam splitter positioned in an optical path between the source and stage, for directing an incident beam from the source onto an optical disc mounted on the stage and a return beam from the disc onto the photodetector; and an optical polarizer positioned in an optical path between the beam splitter and the at least one photodetector, for detection and analysis of changes in polarization of the return beam effected by variation of the orientation of the walls and/or widths of the pits or marks of the disc.
    Type: Grant
    Filed: March 3, 2006
    Date of Patent: February 15, 2011
    Assignee: Seagate Technology LLC
    Inventors: David S. Kuo, Neil Deeman, Shih-Fu Lee, Koichi Wago
  • Patent number: 7833639
    Abstract: A magnetic recording medium for perpendicular magnetic recording includes a substrate, a granular layer having magnetic crystal grains exhibiting perpendicular magnetic anisotropy and nonmagnetic substances for magnetically separating the magnetic crystal grains from each other at grain boundaries of the magnetic crystal grains, and a continuous film layer having magnetic grains to be exchange-coupled to the magnetic crystal grains, the grain boundary width of the magnetic grains being smaller than that of the magnetic crystal grains, wherein separation regions for magnetically separating tracks from each other are disposed in regions between the tracks of the magnetic recording medium in at least the continuous film layer.
    Type: Grant
    Filed: September 27, 2007
    Date of Patent: November 16, 2010
    Assignee: WD Media (Singapore) Pte. Ltd.
    Inventors: Yoshiaki Sonobe, Teiichiro Umezawa, Koichi Wago
  • Patent number: 7830775
    Abstract: A method of performing writable optical recording of a medium to form multilevel oriented nano-structures therein, comprises steps of providing a disc-shaped, writable recording medium having a planar surface; and encoding data/information in the medium by forming a plurality of multilevel nano-structured pits in the surface by scanning with a focused spot of optical energy to form at least one data track therein, including scanning the optical spot in a cross-track direction while rotating the disc about a central axis.
    Type: Grant
    Filed: February 13, 2006
    Date of Patent: November 9, 2010
    Assignee: Seagate Technology LLC
    Inventors: Duane C. Karns, Dieter K. Weller, William A. Challener, Edward Gage, David S. Kuo, Neil Deeman, Shih-Fu Lee, Koichi Wago
  • Publication number: 20100021768
    Abstract: [PROBLEMS] To improve the track density by reducing the track edge noise and sharpening the boundaries of a recording magnetic field by blocking the recording magnetic field spreading outside the recording region in magnetic recording. [MEANS FOR SOLVING PROBLEMS] A magnetic recording medium (10) has a substrate (12) and a perpendicular magnetic recording layer (30) formed over the substrate (12). The perpendicular magnetic recording layer (30) has a granular layer (20) in which a magnetic signal is recorded and a continuous film layer (24) magnetically coupled to the granular layer (20).
    Type: Application
    Filed: February 13, 2008
    Publication date: January 28, 2010
    Inventors: Yoshiaki Sonobe, Takahiro Onoue, Koichi Wago
  • Patent number: 7642041
    Abstract: A rotary apertured interferometric lithography (RAIL) system that includes interferometric lithography tools, a mask with a slit preferably with an arc shape, and a rotating stage is disclosed. The RAIL system could create a servo pattern of a recording-head trajectory of a hard disk drive in a master for magnetic-contact printing. The master can could be used to form arrays of sub-micron sized magnetic elements on a magnetic disk media for high-density magnetic recording applications.
    Type: Grant
    Filed: December 13, 2007
    Date of Patent: January 5, 2010
    Assignee: Seagate Technology LLC
    Inventor: Koichi Wago
  • Patent number: 7459241
    Abstract: A rotary apertured interferometric lithography (RAIL) system that includes interferometric lithography tools, a mask with a slit preferably with an arc shape, and a rotating stage is disclosed. The RAIL system could create a servo pattern of a recording-head trajectory of a hard disk drive in a master for magnetic-contact printing. The master can could be used to form arrays of sub-micron sized magnetic elements on a magnetic disk media for high-density magnetic recording applications.
    Type: Grant
    Filed: September 22, 2003
    Date of Patent: December 2, 2008
    Assignee: Seagate Technology LLC
    Inventor: Koichi Wago
  • Patent number: 7448860
    Abstract: A method of performing imprint lithography of a surface substrate includes a stamper having a thin lubricant coating thereon to facilitate release of the stamper from the imprinted surface to reduce degradation of image replication. Embodiments of the invention include stampers suitable for use in patterning servo information on magnetic recording media having a lubricant coating of from about 1 nm to about 20 nm.
    Type: Grant
    Filed: October 9, 2007
    Date of Patent: November 11, 2008
    Assignee: Seagate Technology LLC
    Inventors: Koichi Wago, Gennady Gauzner
  • Publication number: 20080124658
    Abstract: A rotary apertured interferometric lithography (RAIL) system that includes interferometric lithography tools, a mask with a slit preferably with an arc shape, and a rotating stage is disclosed. The RAIL system could create a servo pattern of a recording-head trajectory of a hard disk drive in a master for magnetic-contact printing. The master can could be used to form arrays of sub-micron sized magnetic elements on a magnetic disk media for high-density magnetic recording applications.
    Type: Application
    Filed: December 13, 2007
    Publication date: May 29, 2008
    Applicant: Seagate Technology LLC
    Inventor: Koichi Wago
  • Patent number: 7378028
    Abstract: A method of fabricating a patterned magnetic layer comprises sequential steps of: (a) providing a workpiece comprising a non-magnetic substrate, a layer of magnetic material overlying a surface of the substrate, and a layer of a non-magnetic material overlying the layer of magnetic material; (b) forming a layer of a mask material on the layer of non-magnetic material; (c) forming a topographical pattern comprising a plurality of recesses in the layer of mask material; (d) selectively removing portions of the layer of non-magnetic material proximate lower portions of the recesses, thereby exposing selected portions of the layer of magnetic material; (e) treating the exposed portions of the layer of magnetic material with a liquid for reducing the magnetic properties thereof; and (f) removing the topographically patterned layer of mask material.
    Type: Grant
    Filed: June 3, 2004
    Date of Patent: May 27, 2008
    Assignee: Seagate Technology LLC
    Inventors: Koichi Wago, HongYing Wang, Nobuo Kurataka, Gennady Gauzner, Neil Deeman
  • Publication number: 20080113157
    Abstract: A method of fabricating a master stamper/imprinter for manufacturing a patterned recording medium by nano-imprint lithography comprises steps of: (a) providing a substrate having a surface; (b) forming a layer of a hybrid resist material on the surface, the resist layer having an exposed upper surface; (c) subjecting selected areas of the exposed upper surface of the resist layer to an energy beam to form therein a latent image of a topographical pattern to be formed in the resist layer and having a correspondence to a pattern to be formed in a patterned recording medium; and (d) developing the latent image into the topographical pattern in the resist layer, wherein only those areas of the resist layer which have received an energy beam exposure dose between a positive-tone threshold dose D0p and a negative-tone threshold dose D0n are developed.
    Type: Application
    Filed: November 13, 2006
    Publication date: May 15, 2008
    Inventors: Kim Y. Lee, Hong Ying Wang, Shih-Fu Lee, David S. Kuo, Koichi Wago, Dieter K. Weller
  • Publication number: 20080090104
    Abstract: A magnetic recording medium for perpendicular magnetic recording includes a substrate, a granular layer having magnetic crystal grains exhibiting perpendicular magnetic anisotropy and nonmagnetic substances for magnetically separating the magnetic crystal grains from each other at grain boundaries of the magnetic crystal grains, and a continuous film layer having magnetic grains to be exchange-coupled to the magnetic crystal grains, the grain boundary width of the magnetic grains being smaller than that of the magnetic crystal grains, wherein separation regions for magnetically separating tracks from each other are disposed in regions between the tracks of the magnetic recording medium in at least the continuous film layer.
    Type: Application
    Filed: September 27, 2007
    Publication date: April 17, 2008
    Applicants: HOYA CORPORATION, HOYA MAGNETICS SINGAPORE PTE. LTD., HOYA CORPORATION USA
    Inventors: Yoshiaki SONOBE, Teiichiro UMEZAWA, Koichi WAGO
  • Publication number: 20080085362
    Abstract: A method of fabricating a patterned perpendicular magnetic recording medium comprises steps of: (a) providing a layer stack including a magnetically soft underlayer (“SUL”) and an overlying non-magnetic interlayer; (b) forming a masking layer on the non-magnetic interlayer; (c) forming a resist layer on the masking layer; (d) forming a pattern of recesses extending through the resist layer and exposing spaced apart surface portions of the masking layer; (e) extending the pattern of recesses through the masking layer to expose spaced apart surface portions of the interlayer; and (f) at least partially filling the pattern of recesses with a magnetically hard material to form a perpendicular magnetic recording layer.
    Type: Application
    Filed: October 4, 2006
    Publication date: April 10, 2008
    Inventors: Bing K. Yen, David S. Kuo, Dieter K. Weller, Kim Y. Lee, Koichi Wago
  • Patent number: 7351484
    Abstract: A high field contrast magnetic stamper/imprinter for use in patterning of magnetic and magneto-optical (MO) recording media by contact printing, comprises: (a) a layer of a magnetic material having a high saturation magnetization Bsat?˜1.2 and high permeability ??˜5, including a first, topographically patterned surface and a second surface opposite the first surface, the first, topographically patterned surface comprising a patterned plurality of spaced-apart recesses with a plurality of non-recessed areas therebetween, the topographical pattern corresponding to a magnetic pattern to be formed in a magnetic or MO recording medium; and (b) a layer of Ni on the second surface. A corrosion-resistant protective overcoat layer may be present on the topographically patterned surface. A method for manufacturing the stamper/imprinter is also disclosed.
    Type: Grant
    Filed: February 22, 2006
    Date of Patent: April 1, 2008
    Assignee: Seagate Technology LLC
    Inventors: Li-Ping Wang, David Kuo, Jing Gui, Koichi Wago
  • Publication number: 20080075845
    Abstract: A method for manufacturing a magnetic recording medium includes the steps of (a) forming a perpendicular magnetic recording layer and (b) applying an ion beam to regions between tracks of the perpendicular magnetic recording layer so as to form separation regions for magnetically separating the tracks from each other. In the step (a), a continuous film layer composed of a multilayer film is formed, and CoB layers and Pd layers are laminated in the multilayer film. In the step (b), the CoB layers and the Pd layers are melted by the ion beam so as to form an alloy of metals contained in the CoB layers and the Pd layers to thereby form the separation regions.
    Type: Application
    Filed: September 27, 2007
    Publication date: March 27, 2008
    Applicants: HOYA CORPORATION, HOYA MAGNETICS SINGAPORE PTE. LTD., HOYA CORPORATION USA
    Inventors: Yoshiaki SONOBE, Teiichiro UMEZAWA, Koichi WAGO
  • Publication number: 20080038398
    Abstract: A method of performing imprint lithography of a surface substrate includes a stamper having a thin lubricant coating thereon to facilitate release of the stamper from the imprinted surface to reduce degradation of image replication. Embodiments of the invention include stampers suitable for use in patterning servo information on magnetic recording media having a lubricant coating of from about 1 nm to about 20 nm.
    Type: Application
    Filed: October 9, 2007
    Publication date: February 14, 2008
    Applicant: SEAGATE TECHNOLOGY LLC
    Inventors: Koichi Wago, Gennady Gauzner
  • Publication number: 20070263308
    Abstract: An apparatus for performing contact printing of a magnetic transition pattern in a magnetic recording medium, comprising: (a) a stamper/imprinter including a body formed of at least one magnetic material having a high saturation magnetization Bsat and a high permeability, including an imprinting surface adapted to be placed in intimate contact with a surface of a magnetic layer, the imprinting surface comprised of a plurality of patterned areas which separate a plurality of areas which are not patterned, each of the areas which is not patterned being provided with at least one of: (i) mechanical reinforcing means for preventing deformation of the body when the imprinting surface is urged into contact with the surface of the magnetic layer; and (ii) gas venting means for facilitating removal of air or other gas from between the imprinting surface and the surface of the magnetic layer when the former is urged into contact with the latter.
    Type: Application
    Filed: May 2, 2007
    Publication date: November 15, 2007
    Applicant: Seagate Technology LLC
    Inventors: Neil Deeman, Joseph Leigh, Koichi Wago, Li-Ping Wang
  • Patent number: 7294294
    Abstract: A method of performing imprint lithography of a surface substrate includes a stamper having a thin lubricant coating thereon to facilitate release of the stamper from the imprinted surface to reduce degradation of image replication. Embodiments of the invention include stampers suitable for use in patterning servo information on magnetic recording media having a lubricant coating of from about 1 nm to about 20 nm.
    Type: Grant
    Filed: October 9, 2001
    Date of Patent: November 13, 2007
    Assignee: Seagate Technology LLC
    Inventors: Koichi Wago, Gennady Gauzner
  • Publication number: 20070206480
    Abstract: A polarization detection system structured for optical read-out of disc-shaped optical data/information storage and retrieval media with surfaces comprised of pits or marks configured as multilevel oriented nano-structures (ONS) with varying pit or mark orientations and widths. The polarization detection system comprises: an optical beam source; a stage for mounting and rotating an optical disc medium about a central axis; at least one photodetector; a beam splitter positioned in an optical path between the source and stage, for directing an incident beam from the source onto an optical disc mounted on the stage and a return beam from the disc onto the photodetector; and an optical polarizer positioned in an optical path between the beam splitter and the at least one photodetector, for detection and analysis of changes in polarization of the return beam effected by variation of the orientation of the walls and/or widths of the pits or marks of the disc.
    Type: Application
    Filed: March 3, 2006
    Publication date: September 6, 2007
    Inventors: David Kuo, Neil Deeman, Shih-Fu Lee, Koichi Wago
  • Publication number: 20070206453
    Abstract: An optical data/information storage medium comprises a disk-shaped substrate with a data/information encoded surface having a plurality of concentric, radially spaced-apart data tracks formed therein, each of said data tracks comprising a plurality of spaced-apart, nano-dimensioned data pits or marks with different angular orientations with respect to a down-track direction of each data track. Each of the data tracks further comprises a plurality of spaced-apart, nano-dimensioned servo tracking pits or marks with a preselected angular orientation with respect to the down-track direction for use in obtaining radial error (RE) signals of a read-out head by means of radial push-pull (PP) or differential phase detection (DPD) tracking.
    Type: Application
    Filed: March 3, 2006
    Publication date: September 6, 2007
    Inventors: David Kuo, Neil Deeman, Shih-Fu Lee, Koichi Wago
  • Publication number: 20070195672
    Abstract: A method of performing writable optical recording of a medium to form multilevel oriented nano-structures therein, comprises steps of providing a disc-shaped, writable recording medium having a planar surface; and encoding data/information in the medium by forming a plurality of multilevel nano-structured pits in the surface by scanning with a focused spot of optical energy to form at least one data track therein, including scanning the optical spot in a cross-track direction while rotating the disc about a central axis.
    Type: Application
    Filed: February 13, 2006
    Publication date: August 23, 2007
    Inventors: Duane Karns, Dieter Weller, William Challener, Edward Gage, David Kuo, Neil Deeman, Shih-Fu Lee, Koichi Wago