Patents by Inventor Ryoichi Hiratsuka

Ryoichi Hiratsuka 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: 11468910
    Abstract: A tape-like magnetic recording medium includes a reinforced substrate, and a recording layer arranged on the reinforced substrate, and the reinforced substrate includes a substrate that has a first face and a second face opposed to each other, and has an average thickness of 4 ?m or smaller, and a metal layer that contains cobalt, arranged on the first face, the reinforced substrate by itself causing thereon a depth of indentation of 0.25 ?m or shallower, when a 0.7-mm-diameter hard sphere is impressed against the second face under 5.0 gf load for 10 seconds.
    Type: Grant
    Filed: August 29, 2019
    Date of Patent: October 11, 2022
    Assignee: Sony Corporation
    Inventors: Hiroto Atagi, Noboru Sekiguchi, Takashi Aizawa, Tomoe Ozaki, Koji Suzuki, Yoichi Kanemaki, Teruo Sai, Ryoichi Hiratsuka, Kazuya Hashimoto
  • Patent number: 11423936
    Abstract: There is provided a magnetic recording medium including a base; a seed layer; a foundation layer; and a recording layer, the seed layer being disposed between the base and the foundation layer, having an amorphous state, including an alloy containing Ti, Cr and O, a percentage of Ti being 30 atomic % to 100 atomic % based on a total amount of Ti and Cr contained in the seed layer, and a percentage of O being 15 atomic % or less based on a total amount of Ti, Cr and O contained in the seed layer. Also, a production method thereof is provided.
    Type: Grant
    Filed: May 9, 2014
    Date of Patent: August 23, 2022
    Assignee: Sony Corporation
    Inventors: Junichi Tachibana, Jota Ito, Tomoe Ozaki, Ryoichi Hiratsuka, Noboru Sekiguchi, Tetsuo Endo
  • Publication number: 20220108723
    Abstract: A tape-like magnetic recording medium includes a reinforced substrate, and a recording layer arranged on the reinforced substrate, and the reinforced substrate includes a substrate that has a first face and a second face opposed to each other, and has an average thickness of 4 ?m or smaller, and a metal layer that contains cobalt, arranged on the first face, the reinforced substrate by itself causing thereon a depth of indentation of 0.25 ?m or shallower, when a 0.7-mm-diameter hard sphere is impressed against the second face under 5.0 gf load for 10 seconds.
    Type: Application
    Filed: August 29, 2019
    Publication date: April 7, 2022
    Inventors: Hiroto ATAGI, Noboru SEKIGUCHI, Takashi AIZAWA, Tomoe OZAKI, Koji SUZUKI, Yoichi KANEMAKI, Teruo SAI, Ryoichi HIRATSUKA, Kazuya HASHIMOTO
  • Publication number: 20220084550
    Abstract: An object is to suppress or prevent a dimensional change of a magnetic recording tape. The present technology provides a magnetic recording tape having a layer structure including a magnetic layer, a base layer, and a back layer in this order, in which a reinforcing layer containing a metal or a metal oxide is disposed on either a surface of the base layer on the magnetic layer side or a surface of the base layer on the back layer side, and a black area in an image obtained by binarizing an optical microscope image of a rectangular region of 64 ?m×48 ?m of the reinforcing layer is 300 ?m2 or less.
    Type: Application
    Filed: December 2, 2019
    Publication date: March 17, 2022
    Inventors: TOMOE OZAKI, JUNICHI TACHIBANA, TOMOE SATO, RYOICHI HIRATSUKA, HIROTO ATAGI, KAZUYA HASHIMOTO, YOICHI KANEMAKI, YUUKO KAMOSHITA, HIKARU TERUI
  • Publication number: 20200411044
    Abstract: To provide a magnetic recording tape that exhibits excellent tape dimension stability even if there are changes in temperature or humidity or even if tension is applied to the magnetic recording tape during tape travelling. The present technology provides a magnetic recording tape, the tape (T1 or T2) having a total thickness of 5.6 ?m or less and including a magnetic layer 1, a non-magnetic layer 2, a base layer 3, and a back layer 4 in the stated order. In one embodiment, a deposition film layer A formed of a metal or an oxide thereof is provided on a lower-layer side of the non-magnetic layer 2. The deposition film layer A may be provided on the back layer 4 and an insulation layer B may also be provided between the deposition film layer A the non-magnetic layer 2.
    Type: Application
    Filed: November 19, 2018
    Publication date: December 31, 2020
    Inventors: Kazuya HASHIMOTO, Takanobu IWAMA, Hiroyuki KOBAYASHI, Ryoichi HIRATSUKA, Yoichi KANEMAKI, Hikaru TERUI
  • Publication number: 20200075051
    Abstract: A magnetic recording medium includes: a flexible and elongated substrate; a soft magnetic layer having an average thickness of 10 nm or more to 50 nm or less; and a recording layer, in which the soft magnetic layer is disposed between the substrate and the recording layer, and a difference in Young's modulus between the magnetic recording medium and the substrate in a longitudinal direction of the substrate is 2.4 GPa or more.
    Type: Application
    Filed: April 6, 2018
    Publication date: March 5, 2020
    Inventors: JUNICHI TACHIBANA, TAKASHI AIZAWA, TERUO SAI, NOBORU SEKIGUCHI, TETSUO ENDO, TOMOE OZAKI, RYOICHI HIRATSUKA
  • Patent number: 9607813
    Abstract: Provided is a magnetic field generation apparatus including: two or more main magnetic pole portions configured to generate a main magnetic field; one or more secondary magnetic pole portions including a plurality of first divisional magnets obtained by a division, that generate a secondary magnetic field for adjusting the generated main magnetic field; and a yoke portion including one or more first yokes opposing the plurality of first divisional magnets in correspondence with the one or more secondary magnetic pole portions.
    Type: Grant
    Filed: June 30, 2014
    Date of Patent: March 28, 2017
    Assignee: SONY CORPORATION
    Inventors: Jun Sasaki, Atsuhiro Abe, Ryoichi Hiratsuka
  • Publication number: 20150014158
    Abstract: Provided is a magnetic field generation apparatus including: two or more main magnetic pole portions configured to generate a main magnetic field; one or more secondary magnetic pole portions including a plurality of first divisional magnets obtained by a division, that generate a secondary magnetic field for adjusting the generated main magnetic field; and a yoke portion including one or more first yokes opposing the plurality of first divisional magnets in correspondence with the one or more secondary magnetic pole portions.
    Type: Application
    Filed: June 30, 2014
    Publication date: January 15, 2015
    Inventors: Jun Sasaki, Atsuhiro Abe, Ryoichi Hiratsuka
  • Publication number: 20140342189
    Abstract: There is provided a magnetic recording medium including a base; a seed layer; a foundation layer; and a recording layer, the seed layer being disposed between the base and the foundation layer, having an amorphous state, including an alloy containing Ti, Cr and O, a percentage of Ti being 30 atomic % to 100 atomic % based on a total amount of Ti and Cr contained in the seed layer, and a percentage of O being 15 atomic % or less based on a total amount of Ti, Cr and O contained in the seed layer. Also, a production method thereof is provided.
    Type: Application
    Filed: May 9, 2014
    Publication date: November 20, 2014
    Applicant: Sony Corporation
    Inventors: Junichi Tachibana, Jota Ito, Tomoe Ozaki, Ryoichi Hiratsuka, Noboru Sekiguchi, Tetsuo Endo
  • Publication number: 20130089665
    Abstract: A self-limiting reaction deposition apparatus includes a first guide roller, a second guide roller, and at least one first head. The first guide roller changes, while supporting a first surface of a base material conveyed by a roll-to-roll process, a conveying direction of the base material from a first direction to a second direction that is not parallel to the first direction. The second guide roller changes, while supporting the first surface of the base material, the conveying direction of the base material from the second direction to a third direction that is not parallel to the second direction. The at least one first head is disposed between the first guide roller and the second guide roller, faces a second surface opposite to the first surface of the base material, and discharges, towards the second surface, a raw material gas for self-limiting reaction deposition.
    Type: Application
    Filed: September 14, 2012
    Publication date: April 11, 2013
    Applicant: SONY CORPORATION
    Inventors: Hiroya Takenaka, Ryoichi Hiratsuka, Masaaki Sekine, Takuji Matsuo, Hidetoshi Honda
  • Patent number: 7531251
    Abstract: A magnetic recording medium includes a nonmagnetic support having a thickness less than 7 ?m and a width of 8 mm; a ferromagnetic metal layer disposed on a surface of the nonmagnetic support; and a reinforcing layer disposed on the other surface of the nonmagnetic support. The magnetic recording medium has a flexural rigidity EI of 5.9×10?8 to 1.3×10?7 N·m (6.0×10?4 to 1.3×10?3 g·cm). The flexural rigidity EI is determined by the following equation: EI=(?/4?2/?)·W·a3/d·b×9.8×10?5 (wherein W is a load that causes an annular test piece having a radius of a cm and a width of b cm which is prepared by cutting a magnetic sheet formed of the magnetic recording medium to undergo a radial displacement d of 0.2?a).
    Type: Grant
    Filed: January 11, 2006
    Date of Patent: May 12, 2009
    Assignee: Sony Corporation
    Inventors: Ichiro Kanagawa, Kazuhiko Suzuki, Ryoichi Hiratsuka, Hidetoshi Honda
  • Patent number: 7449221
    Abstract: A method of manufacturing a metallic thin film type magnetic recording medium is provided. The method comprises the steps of arranging an initial substance of said recording medium in opposition to a plasma discharge electrode, said initial substance comprising a non-magnetic support base, a metallic layer capable of functioning as a metallic electrode formed on said non-magnetic support base and a metallic magnetic layer formed on said metallic layer, and forming a protection film on a surface of said initial substance of said recording medium by way of generating plasma discharge while feeding raw material gas between said metallic layer/said metallic magnetic layer and said plasma discharge electrode.
    Type: Grant
    Filed: June 29, 2006
    Date of Patent: November 11, 2008
    Assignee: Sony Corporation
    Inventors: Ryoichi Hiratsuka, Ichiro Kanagawa, Kasumi Suzuki, Tomoe Ozaki
  • Patent number: 7214436
    Abstract: A magnetic recording medium of a metal thin-film type, which includes a magnetic layer and a carbon protective layer on a non-magnetic support member, and in which a non-magnetic metal thin-film is provided between the magnetic layer and the carbon protective layer, is provided. The magnetic recording medium thus produced can be run stably.
    Type: Grant
    Filed: May 15, 2003
    Date of Patent: May 8, 2007
    Assignee: Sony Corporation
    Inventors: Ryoichi Hiratsuka, Tomoe Ozaki, Taketoshi Sato, Miho Abiko, Ichiro Kanagawa, Kasumi Suzuki
  • Publication number: 20060240182
    Abstract: A method of manufacturing a metallic thin film type magnetic recording medium is provided. The method comprises the steps of arranging an initial substance of said recording medium in opposition to a plasma discharge electrode, said initial substance comprising a non-magnetic support base, a metallic layer capable of functioning as a metallic electrode formed on said non-magnetic support base and a metallic magnetic layer formed on said metallic layer, and forming a protection film on a surface of said initial substance of said recording medium by way of generating plasma discharge while feeding raw material gas between said metallic layer/said metallic magnetic layer and said plasma discharge electrode.
    Type: Application
    Filed: June 29, 2006
    Publication date: October 26, 2006
    Inventors: Ryoichi Hiratsuka, Ichiro Kanagawa, Kasumi Suzuki, Tomoe Ozaki
  • Publication number: 20060154114
    Abstract: A magnetic recording medium includes a nonmagnetic support having a thickness less than 7 ?m and a width of 8 mm; a ferromagnetic metal layer disposed on a surface of the nonmagnetic support; and a reinforcing layer disposed on the other surface of the nonmagnetic support. The magnetic recording medium has a flexural rigidity EI of 5.9×10?8 to 1.3×10?7 N·m (6.0×10?4 to 1.3×10?3 g·cm). The flexural rigidity EI is determined by the following equation: EI=(?/4?2/?)·W·a3/d·b×9.8×10?5 (wherein W is a load that causes an annular test piece having a radius of a cm and a width of b cm which is prepared by cutting a magnetic sheet formed of the magnetic recording medium to undergo a radial displacement d of 0.2?a).
    Type: Application
    Filed: January 11, 2006
    Publication date: July 13, 2006
    Inventors: Ichiro Kanagawa, Kazuhiko Suzuki, Ryoichi Hiratsuka, Hidetoshi Honda
  • Patent number: 7070871
    Abstract: A method of manufacturing a metallic thin film type magnetic recording medium is provided. The method comprises the steps of arranging an initial substance of said recording medium in opposition to a plasma discharge electrode, said initial substance comprising a non-magnetic support base, a metallic layer capable of functioning as a metallic electrode formed on said non-magnetic support base and a metallic magnetic layer formed on said metallic layer, and forming a protection film on a surface of said initial substance of said recording medium by way of generating plasma discharge while feeding raw material gas between said metallic layer/said metallic magnetic layer and said plasma discharge electrode.
    Type: Grant
    Filed: June 27, 2002
    Date of Patent: July 4, 2006
    Assignee: Sony Corporation
    Inventors: Ryoichi Hiratsuka, Ichiro Kanagawa, Kasumi Suzuki, Tomoe Ozaki
  • Patent number: 6999278
    Abstract: There is provided a cleaning tape capable of attaining sufficient cleaning effects while preventing electrostatic discharge damage to magnetoresistive heads or changes in reproduced output due to excessive head wear. The cleaning tape includes a non-magnetic substrate 1, surface protrusions 6 formed on the non-magnetic substrate 1 with particles 2 having a particle diameter of 10 to 40 nm at a density of 300×104 to 5000×104 mm2, a metal evaporated film 3 (preferably an electrically conductive layer such as an alloy layer containing Co as a primary component, an Al layer or the like) having a thickness of 10 to 200 nm and an inorganic protection film 4 having a thickness of 3 to 50 nm formed on the metal evaporated film 3.
    Type: Grant
    Filed: June 17, 2003
    Date of Patent: February 14, 2006
    Assignee: Sony Corporation
    Inventors: Hidetoshi Honda, Takashi Kanou, Hitoshi Wako, Satoshi Sekino, Ryoichi Hiratsuka
  • Patent number: 6800374
    Abstract: A cleaning tape comprising a nonmagnetic base film, an evaporated metal layer, specifically a magnetic layer or electroconductive layer, formed on the nonmagnetic base film, an inorganic protective film formed on the evaporated metal layer, and surface projections formed on the nonmagnetic base film by particles having a predetermined diameter and density. The tape has a low electric resistivity, a low head abrasion, and a sufficient cleaning effect suitable for cleaning a magnetoresistive type head.
    Type: Grant
    Filed: June 14, 2002
    Date of Patent: October 5, 2004
    Assignee: Sony Corporation
    Inventors: Hidetoshi Honda, Takashi Kanou, Hitoshi Wako, Satoshi Sekino, Ryoichi Hiratsuka
  • Publication number: 20030224216
    Abstract: A magnetic recording medium of a metal thin-film type, which includes a magnetic layer and a carbon protective layer on a non-magnetic support member, and in which a non-magnetic metal thin-film is provided between the magnetic layer and the carbon protective layer, is provided. The magnetic recording medium thus produced can be run stably.
    Type: Application
    Filed: May 15, 2003
    Publication date: December 4, 2003
    Inventors: Ryoichi Hiratsuka, Tomoe Ozaki, Taketoshi Sato, Miho Abiko, Ichiro Kanagawa, Kasumi Suzuki
  • Publication number: 20030217698
    Abstract: A reactor for generating plasma is provided in a vacuum chamber. The reactor has an opening in the direction of a supporting portion for a deposition base material, and the reactor includes an outer housing and a cylindrical inner wall structure that is inserted in the outer housing and is freely attachable and detachable to and from the outer housing. The cleaning of the reactor is performed with respect to the cylindrical inner wall structure that is simpler in structure than the outer housing, and hence the reactor can be cleaned reliably and with ease, thereby making it possible to improve the operational efficiency and the yield rate. The problem of prolonged operation time resulting from the cleaning of the reactor in a plasma chemical vapor deposition apparatus is thus resolved.
    Type: Application
    Filed: May 14, 2003
    Publication date: November 27, 2003
    Inventors: Ryoichi Hiratsuka, Taketoshi Sato, Takashi Watanabe, Toshihiro Konishi