Patents by Inventor Noriyuki Kumasaka

Noriyuki Kumasaka 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: 8348721
    Abstract: A glass substrate for perpendicular magnetic recording, having a surface with an average surface roughness of 2.0? or less and surface height variations of 1? or less with wavelengths in the range of 0.05 mm-0.5 mm in both radial and circumferential directions, is produced by rotating a glass substrate, supplying polishing slurry containing a specified amount of abrading particles of artificial diamond on its surface, pressing a polishing tape on the surface and causing this polishing tape to travel in a direction opposite to the direction of rotation of the glass substrate.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: January 8, 2013
    Assignee: Nihon Micro Coating Co., Ltd.
    Inventors: Yuji Horie, Tatsuya Tanifuji, Noriyuki Kumasaka
  • Patent number: 8148301
    Abstract: An oxide superconductor member is composed of a tape-shaped substrate, an intermediate layer formed on this substrate and an oxide superconductor thin film layer formed on this intermediate layer. A surface of the tape-shaped substrate is polished by continuously running the tape-shaped substrate. The polishing step includes initial polishing process and finishing process which are carried out such that the average surface roughness Ra of the substrate becomes 2 nanometers or less and the in-plane directionality of the intermediate layer becomes 5° or less after the polishing step.
    Type: Grant
    Filed: August 24, 2007
    Date of Patent: April 3, 2012
    Assignee: NIHON Micro Coating Co., Ltd.
    Inventors: Sanaki Horimoto, Takuya Nagamine, Takehiro Watanabe, Fumi Murokawa, Yuji Horie, Noriyuki Kumasaka, Masahiro Hosoi
  • Patent number: 8143194
    Abstract: An oxide superconductor member is composed of a tape-shaped substrate, an intermediate layer formed on this substrate and an oxide superconductor thin film layer formed on this intermediate layer. A surface of the tape-shaped substrate is polished by continuously running the tape-shaped substrate. The polishing step includes initial polishing process and finishing process which are carried out such that the average surface roughness Ra of the substrate becomes 2 nanometers or less and the in-plane directionality of the intermediate layer becomes 5° or less after the polishing step.
    Type: Grant
    Filed: August 1, 2007
    Date of Patent: March 27, 2012
    Assignee: NIHON Micro Coating Co., Ltd.
    Inventors: Sanaki Horimoto, Takuya Nagamine, Takehiro Watanabe, Fumi Murokawa, Yuji Horie, Noriyuki Kumasaka, Masahiro Hosoi
  • Patent number: 8049990
    Abstract: A cleaning tape has a base tape made of a synthetic resin and a cleaning layer formed on a surface of this base tape. The cleaning layer has a binding agent and a large number of spherical particles dispersed in the binding agent in a single particle layer. Such a cleaning tape is capable of removing very small unwanted protrusions and particles on the surface of a target object such as a magnetic hard disk without forming scratches.
    Type: Grant
    Filed: September 30, 2008
    Date of Patent: November 1, 2011
    Assignee: Nihon Micro Coating Co., Ltd.
    Inventors: Yuji Horie, Yasuyuki Yokota, Jun Tamura, Akihiro Sakamoto, Noriyuki Kumasaka
  • Patent number: 7857876
    Abstract: Diamond clusters are used as a polishing material of free abrading particles, each being a combination of artificial diamond particles having primary particle diameters of 20 nm or less and impurities that are attached around these diamond particles. The density of non-diamond carbon contained in the impurities is in the range of 95% or more and 99% or less, and the density of chlorine contained in other than non-diamond carbon in the impurities is 0.5% or more and preferably 3.5% or less. The diameters of these diamond clusters are in the range of 30 nm or more and 500 nm or less, and their average diameter is in the range of 30 nm or more and 200 nm or less. Such polishing material is produced first by an explosion shock method to obtain diamond clusters and then removing the impurities such that density of non-diamond carbon contained in the impurities and density of chlorine contained in other than non-diamond carbon in the impurities become adjusted.
    Type: Grant
    Filed: April 8, 2009
    Date of Patent: December 28, 2010
    Assignee: Nihon Micro Coating Co., Ltd.
    Inventors: Noriyuki Kumasaka, Yuji Horie, Mitsuru Saito, Kazuei Yamaguchi
  • Patent number: 7811972
    Abstract: A target surface of a tape-shaped substrate of an oxide superconductor with an intermediate layer formed on this target surface and an oxide superconductor thin film is polished by causing the tape-shaped substrate to continuously run. The polishing step includes an initial polishing process for carrying out random polishing of the target surface and a finishing process that is carried out after the initial polishing process for forming grooves on the target surface along the running direction of the substrate. The intermediate layer has an in-plane directionality of 7° or less. The tape-shaped substrate is fabricated by rolling nickel, a nickel alloys or stainless steel.
    Type: Grant
    Filed: August 19, 2008
    Date of Patent: October 12, 2010
    Assignee: NIHON Micro Coating Co., Ltd.
    Inventors: Yuji Horie, Noriyuki Kumasaka, Sanaki Horimoto
  • Publication number: 20100203809
    Abstract: Polishing particles are made of artificial diamond produced by a shock method, having density of 3.0-3.35 g/cm3 and including secondary particles with average particle diameter of 30 nm-500 nm. Such polishing particles are produced by firstly obtaining a product containing artificial diamond by a shock method, then subjecting this product to an acid treatment by using one or more strong acids such as concentrated sulfuric acid, concentrated nitric acid and concentrated hydrochloric acid to thereby remove impurities from and wash the product, thereafter subjecting the product to a classification process to thereby separate artificial diamond of a first kind having secondary particles with particle diameters of 30 nm-500 nm and artificial diamond of a second kind having secondary particles with particle diameters in excess of 500 nm and selecting artificial diamond of a third kind having density of 3.0-3.35 g/cm3 out of the artificial diamond of the first kind.
    Type: Application
    Filed: February 18, 2010
    Publication date: August 12, 2010
    Applicant: NIHON MICRO COATING CO., LTD.
    Inventor: Noriyuki Kumasaka
  • Publication number: 20100160170
    Abstract: A surface polishing method for enhancing crystal orientation on the surface of a tapelike metal substrate in order to enhance the critical current of a superconducting thin film. In an oxide superconductor comprising a tapelike substrate, an intermediate layer formed on the tapelike substrate, and an oxide superconducting thin film layer formed on the intermediate layer, the method for polishing a surface to be polished of the tapelike substrate comprises a step for polishing the surface to be polished while traveling the tapelike substrate continuously, wherein an initial polishing step and a finish polishing step are included. Ultimately, the average surface roughness Ra of the polished surface is 2 nanometer or less and the in-plane orientation ?? is 5° or less.
    Type: Application
    Filed: August 24, 2007
    Publication date: June 24, 2010
    Applicant: NIHON MICRO COATING CO., LTD.
    Inventors: Sanaki Horimoto, Takuya Nagamine, Takehiro Watanabe, Fumi Murokawa, Yuji Horie, Noriyuki Kumasaka, Masahiro Hosoi
  • Publication number: 20100016169
    Abstract: An oxide superconductor member is composed of a tape-shaped substrate, an intermediate layer formed on this substrate and an oxide superconductor thin film layer formed on this intermediate layer. A surface of the tape-shaped substrate is polished by continuously running the tape-shaped substrate. The polishing step includes initial polishing process and finishing process which are carried out such that the average surface roughness Ra of the substrate becomes 2 nanometers or less and the in-plane directionality of the intermediate layer becomes 5° or less after the polishing step.
    Type: Application
    Filed: August 1, 2007
    Publication date: January 21, 2010
    Applicant: NIHON MICRO COATING CO., LTD.
    Inventors: Sanaki Horimoto, Takuya Nagamine, Takehiro Watanabe, Fumi Murokawa, Yuji Horie, Noriyuki Kumasaka, Masahiro Hosoi
  • Patent number: 7585341
    Abstract: Diamond clusters are used as a polishing material of free abrading particles, each being a combination of artificial diamond particles having primary particle diameters of 20 nm or less and impurities that are attached around these diamond particles. The density of non-diamond carbon contained in the impurities is in the range of 95% or more and 99% or less, and the density of chlorine contained in other than non-diamond carbon in the impurities is 0.5% or more and preferably 3.5% or less. The diameters of these diamond clusters are in the range of 30 nm or more and 500 nm or less, and their average diameter is in the range of 30 nm or more and 200 nm or less.
    Type: Grant
    Filed: May 23, 2007
    Date of Patent: September 8, 2009
    Assignee: Nihon Micro Coating Co., Ltd.
    Inventors: Noriyuki Kumasaka, Yuji Horie, Mitsuru Saito, Kazuei Yamaguchi
  • Publication number: 20090188170
    Abstract: Diamond clusters are used as a polishing material of free abrading particles, each being a combination of artificial diamond particles having primary particle diameters of 20 nm or less and impurities that are attached around these diamond particles. The density of non-diamond carbon contained in the impurities is in the range of 95% or more and 99% or less, and the density of chlorine contained in other than non-diamond carbon in the impurities is 0.5% or more and preferably 3.5% or less. The diameters of these diamond clusters are in the range of 30 nm or more and 500 nm or less, and their average diameter is in the range of 30 nm or more and 200 nm or less. Such polishing material is produced first by an explosion shock method to obtain diamond clusters and then removing the impurities such that density of non-diamond carbon contained in the impurities and density of chlorine contained in other than non-diamond carbon in the impurities become adjusted.
    Type: Application
    Filed: April 8, 2009
    Publication date: July 30, 2009
    Applicant: NIHON MICRO COATING CO., LTD.
    Inventors: Noriyuki Kumasaka, Yuji Horie, Mitsuru Saito, Kazuei Yamaguchi
  • Publication number: 20090163117
    Abstract: A glass substrate for perpendicular magnetic recording, having a surface with an average surface roughness of 2.0 ? or less and surface height variations of 1 ? or less with wavelengths in the range of 0.05 mm-0.5 mm in both radial and circumferential directions, is produced by rotating a glass substrate, supplying polishing slurry containing a specified amount of abrading particles of artificial diamond on its surface, pressing a polishing tape on the surface and causing this polishing tape to travel in a direction opposite to the direction of rotation of the glass substrate.
    Type: Application
    Filed: February 27, 2009
    Publication date: June 25, 2009
    Applicant: Nihon Micro Coating Co., Ltd.
    Inventors: Yuji Horie, Tatsuya Tanifuji, Noriyuki Kumasaka
  • Publication number: 20090092023
    Abstract: A cleaning tape has a base tape made of a synthetic resin and a cleaning layer formed on a surface of this base tape. The cleaning layer has a binding agent and a large number of spherical particles dispersed in the binding agent in a single particle layer. Such a cleaning tape is capable of removing very small unwanted protrusions and particles on the surface of a target object such as a magnetic hard disk without forming scratches.
    Type: Application
    Filed: September 30, 2008
    Publication date: April 9, 2009
    Applicant: NIHON MICRO COATING CO., LTD.
    Inventors: Yuji Horie, Yasuyuki Yokota, Jun Tamura, Akihiro Sakamoto, Noriyuki Kumasaka
  • Publication number: 20090054243
    Abstract: A target surface of a tape-shaped substrate of an oxide superconductor with an intermediate layer formed on this target surface and an oxide superconductor thin film is polished by causing the tape-shaped substrate to continuously run. The polishing step includes an initial polishing process for carrying out random polishing of the target surface and a finishing process that is carried out after the initial polishing process for forming grooves on the target surface along the running direction of the substrate. The intermediate layer has an in-plane directionality of 7° or less. The tape-shaped substrate is fabricated by rolling nickel, a nickel alloys or stainless steel.
    Type: Application
    Filed: August 19, 2008
    Publication date: February 26, 2009
    Applicant: NIHON MICRO COATING CO., LTD.
    Inventors: Yuji Horie, Noriyuki Kumasaka, Sanaki Horimoto
  • Patent number: 7374473
    Abstract: Texturing slurry for texturing a substrate for a magnetic hard disk is obtained by dispersing abrading particles of a specified kind in a specified kind of dispersant. The abrading particles include diamond clusters formed with artificial diamond particles with primary particle diameter of 20 nm or less and surrounded by impurities containing chlorine at a certain ratio. The cluster diameter and the average cluster diameter of the diamond clusters are each within a specified range. For texturing a substrate surface, the substrate is rotated, texturing slurry of this invention is supplied to the surface and a texturing tape of a specified kind is pressed against the substrate surface while it is caused to run.
    Type: Grant
    Filed: November 27, 2006
    Date of Patent: May 20, 2008
    Assignee: NIHON Micro Coating Co., Ltd.
    Inventors: Noriyuki Kumasaka, Yuji Horie, Mitsuru Saito, Kazuei Yamaguchi
  • Publication number: 20070231245
    Abstract: Diamond clusters are used as a polishing material of free abrading particles, each being a combination of artificial diamond particles having primary particle diameters of 20 nm or less and impurities that are attached around these diamond particles. The density of non-diamond carbon contained in the impurities is in the range of 95% or more and 99% or less, and the density of chlorine contained in other than non-diamond carbon in the impurities is 0.5% or more and preferably 3.5% or less. The diameters of these diamond clusters are in the range of 30 nm or more and 500 nm or less, and their average diameter is in the range of 30 nm or more and 200 nm or less. Such polishing material is produced first by an explosion shock method to obtain diamond clusters and then removing the impurities such that density of non-diamond carbon contained in the impurities and density of chlorine contained in other than non-diamond carbon in the impurities become adjusted.
    Type: Application
    Filed: May 23, 2007
    Publication date: October 4, 2007
    Inventors: Noriyuki Kumasaka, Yuji Horie, Mitsuru Saito, Kazuei Yamaguchi
  • Publication number: 20070123153
    Abstract: Texturing slurry for texturing a substrate for a magnetic hard disk is obtained by dispersing abrading particles of a specified kind in a specified kind of dispersant. The abrading particles include diamond clusters formed with artificial diamond particles with primary particle diameter of 20 nm or less and surrounded by impurities containing chlorine at a certain ratio. The cluster diameter and the average cluster diameter of the diamond clusters are each within a specified range. For texturing a substrate surface, the substrate is rotated, texturing slurry of this invention is supplied to the surface and a texturing tape of a specified kind is pressed against the substrate surface while it is caused to run.
    Type: Application
    Filed: November 27, 2006
    Publication date: May 31, 2007
    Inventors: Noriyuki Kumasaka, Yuji Horie, Mitsuru Saito, Kazuei Yamaguchi
  • Publication number: 20060252355
    Abstract: An edge part of a disk-shaped workpiece is polished by pressing a polishing tape and causing a pad or a contact roller to undergo a reciprocating motion intermittently or continuously along the edge part such that the front surface part, the end surface part and the back surface part of the workpiece are polished. The polishing tape has a polishing layer formed by having diamond particles with average diameter in the range of 0.1 ?m-16 ?m fastened by a binder. This series of polishing steps may be repeated by using different polishing tapes with diamond particles having different average diameters.
    Type: Application
    Filed: July 3, 2006
    Publication date: November 9, 2006
    Inventor: Noriyuki Kumasaka
  • Publication number: 20060216551
    Abstract: A perpendicular magnetic recording disk is produced by forming a soft magnetic layer on a non-magnetic substrate either directly or through a foundation layer in between, forming texturing marks on the surface of this soft magnetic layer, forming a perpendicular magnetic recording layer on the soft magnetic layer either directly or through an intermediate layer in between, and forming a protective layer on the perpendicular recording layer. A texturing process is carried out such that the average surface roughness of the soft magnetic layer is 0.5 ?-5.0 ?, and the line density of the texturing marks is 30 lines/?m or more.
    Type: Application
    Filed: March 20, 2006
    Publication date: September 28, 2006
    Inventors: Tatsuya Tanifuji, Noriyuki Kumasaka
  • Publication number: 20060027527
    Abstract: A perpendicular magnetic recording disk is produced by polishing to make smoother both surfaces of a substrate and sequentially forming a soft magnetic layer, a perpendicular recording layer and a protective layer on each of the polished surfaces of the substrate. The surfaces of the soft magnetic layers are polished by a fixed particle polishing method to be made smoother, and the perpendicular recording layers is formed on the smoothed surfaces of the soft magnetic layers either directly or with an intermediate layer in between.
    Type: Application
    Filed: July 29, 2005
    Publication date: February 9, 2006
    Inventors: Yasuyuki Yokota, Hisatomo Ohno, Noriyuki Kumasaka