Patents by Inventor Yoichi Kanemaki

Yoichi Kanemaki 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: 11430477
    Abstract: A magnetic recording medium includes a nonmagnetic support body, and a magnetic layer containing magnetic powder, in which the magnetic powder contains ?-Fe2O3 crystal (including a case of substituting a portion of Fe site with a metal element M), a product of residual magnetization and a thickness of the magnetic layer is from 0.5 mA to 6.0 mA, and a squareness ratio which is measured in a longitudinal direction of the magnetic layer is 0.3 or less.
    Type: Grant
    Filed: July 31, 2020
    Date of Patent: August 30, 2022
    Assignee: Sony Corporation
    Inventors: Masaru Terakawa, Yoichi Kanemaki, Minoru Yamaga
  • Patent number: 11355145
    Abstract: The magnetic recording medium includes a long substrate body, and a magnetic layer including a powder of cubic crystal ferrite magnetic particles. The sum of a squareness ratio in the longitudinal direction and a squareness ratio in the vertical direction is 1.2 or more, and the difference of the squareness ratio in the longitudinal direction and the squareness ratio in the vertical direction is 0.15 or more.
    Type: Grant
    Filed: December 14, 2016
    Date of Patent: June 7, 2022
    Assignee: Sony Corporation
    Inventors: Eiji Nakashio, Masaru Terakawa, Yoichi Kanemaki, Tomoe Sato, Katsunori Maeshima, Nobuyuki Sasaki
  • 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
  • Patent number: 11217277
    Abstract: Provided is a magnetic recording medium including: a recording layer containing a powder of particles containing ? iron oxide, in which a ratio ((Hc(50)/Hc(25))×100) of a coercive force Hc(50) measured in a thickness direction of the magnetic recording medium at 50° C. and a coercive force Hc(25) measured in the thickness direction of the magnetic recording medium at 25° C. is 95% or greater, the coercive force Hc(25) is 200 kA/m or greater, and a squareness ratio measured in a transport direction of the magnetic recording medium is 30% or less.
    Type: Grant
    Filed: April 13, 2018
    Date of Patent: January 4, 2022
    Assignee: Sony Corporation
    Inventors: Masaru Terakawa, Yoichi Kanemaki, Minoru Yamaga
  • Patent number: 11031034
    Abstract: A magnetic recording medium is used in a recording/reproduction apparatus having a shortest recording wavelength of not more than 75 nm, the magnetic recording medium including a recording layer that contains a powder of particles containing ?-iron oxide, in which a squareness ratio measured in a traveling direction of the magnetic recording medium is not more than 30%, a ratio (Dmax/Dmin) of an average longest diameter Dmax of the particles to an average shortest diameter Dmin of the particles satisfies a relationship of 1.0?(Dmax/Dmin)?1.1, an average thickness ?mag of the recording layer is not more than 100 nm, and a ratio (?mag/Dmin) of the average thickness ?mag of the recording layer to the average shortest diameter Dmin of the particles satisfies a relationship of ?mag/Dmin?5.
    Type: Grant
    Filed: November 17, 2017
    Date of Patent: June 8, 2021
    Assignee: Sony Corporation
    Inventors: Masaru Terakawa, Yoichi Kanemaki, Minoru Yamaga
  • 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
  • Patent number: 10872633
    Abstract: A magnetic recording medium according to a first technique includes an elongated substrate having a first surface and a second surface, a first reinforcing layer disposed on the first surface, a second reinforcing layer disposed on the second surface, an adhesion suppressing layer disposed on the second reinforcing layer, and a recording layer disposed on the first reinforcing layer or the adhesion suppressing layer.
    Type: Grant
    Filed: May 11, 2017
    Date of Patent: December 22, 2020
    Assignee: Sony Corporation
    Inventors: Eiji Nakashio, Yuta Akimoto, Tomoe Sato, Yoichi Kanemaki, Nobuyuki Sasaki, Masaru Terakawa, Kazuya Hashimoto, Katsunori Maeshima, Minoru Yamaga, Hikaru Terui, Hiroyuki Kobayashi
  • Publication number: 20200365177
    Abstract: A magnetic recording medium includes a nonmagnetic support body, and a magnetic layer containing magnetic powder, in which the magnetic powder contains ?-Fe2O3 crystal (including a case of substituting a portion of Fe site with a metal element M), a product of residual magnetization and a thickness of the magnetic layer is from 0.5 mA to 6.0 mA, and a squareness ratio which is measured in a longitudinal direction of the magnetic layer is 0.3 or less.
    Type: Application
    Filed: July 31, 2020
    Publication date: November 19, 2020
    Applicant: Sony Corporation
    Inventors: Masaru Terakawa, Yoichi Kanemaki, Minoru Yamaga
  • Patent number: 10839848
    Abstract: The magnetic recording medium includes a support and a magnetic layer containing a magnetic powder. The magnetic powder includes at least either of a magnetic particle containing a cubic ferrite and a magnetic particle containing an ?-phase iron oxide. The magnetic powder has a mean particle size of 10 nm or more and 14 nm or less, the magnetic powder has a mean aspect ratio of 0.75 or more and 1.25 or less, and the magnetic layer has a ten-point mean roughness Rz of 35 nm or less.
    Type: Grant
    Filed: October 31, 2018
    Date of Patent: November 17, 2020
    Assignee: Sony Corporation
    Inventors: Eiji Nakashio, Minoru Yamaga, Masaru Terakawa, Yoichi Kanemaki, Katsunori Maeshima, Jun Hashimoto
  • Patent number: 10803897
    Abstract: A magnetic recording medium includes a nonmagnetic support body, and a magnetic layer containing magnetic powder, in which the magnetic powder contains ?:Fe2O3 crystal (including a case of substituting a portion of Fe site with a metal element M), a product of residual magnetization and a thickness of the magnetic layer is from 0.5 mA to 6.0 mA, and a squareness ratio which is measured in a longitudinal direction of the magnetic layer is 0.3 or less.
    Type: Grant
    Filed: March 22, 2018
    Date of Patent: October 13, 2020
    Assignee: Sony Corporation
    Inventors: Masaru Terakawa, Yoichi Kanemaki, Minoru Yamaga
  • Publication number: 20200321025
    Abstract: A magnetic recording medium includes an elongated substrate, and a reinforcing layer and a carbon thin film disposed on one surface of the substrate.
    Type: Application
    Filed: May 11, 2017
    Publication date: October 8, 2020
    Applicant: Sony Corporation
    Inventors: Eiji NAKASHIO, Yuta AKIMOTO, Tomoe SATO, Yoichi KANEMAKI, Nobuyuki SASAKI, Masaru TERAKAWA, Kazuya HASHIMOTO, Katsunori MAESHIMA, Minoru YAMAGA, Hikaru TERUI, Hiroyuki KOBAYASHI
  • Publication number: 20200098390
    Abstract: Provided is a magnetic recording medium having a recording track width of 2 ?m or less, including: a recording layer containing a powder of particles containing ? iron oxide, in which a squareness ratio measured in a transport direction is 30% or less, a squareness ratio S1 measured in the transport direction and a squareness ratio S2 measured in a width direction satisfy a relationship S1?S2, a coercive force is 220 kA/m or greater and 310 kA/m or less, an activation volume is 8000 nm3 or less, and in a switching field distribution (SFD) curve, a peak ratio X/Y of a main peak height X and a height Y of a sub-peak near zero magnetic field is 3.0 or greater.
    Type: Application
    Filed: April 24, 2018
    Publication date: March 26, 2020
    Inventors: Masaru TERAKAWA, Yoichi KANEMAKI, Minoru YAMAGA
  • Publication number: 20200066302
    Abstract: Provided is a magnetic recording medium including: a recording layer containing a powder of particles containing ? iron oxide, in which a ratio ((Hc(50)/Hc(25))×100) of a coercive force Hc(50) measured in a thickness direction of the magnetic recording medium at 50° C. and a coercive force Hc(25) measured in the thickness direction of the magnetic recording medium at 25° C. is 95% or greater, the coercive force Hc(25) is 200 kA/m or greater, and a squareness ratio measured in a transport direction of the magnetic recording medium is 30% or less.
    Type: Application
    Filed: April 13, 2018
    Publication date: February 27, 2020
    Inventors: Masaru TERAKAWA, Yoichi KANEMAKI, Minoru YAMAGA
  • Publication number: 20190362753
    Abstract: A magnetic recording medium, which is used in a recording and playback device in which the shortest recording wavelength is 75 nm or less, in which the magnetic recording medium has a recording layer including powder of ?-iron oxide-containing particles, the average particle size of the particles is 22 nm or less, the coercive force He is 220 kA/m or more and 320 kA/m or less, and the non linear transition shift is 20% or less.
    Type: Application
    Filed: December 28, 2017
    Publication date: November 28, 2019
    Inventors: Masaru TERAKAWA, Yoichi KANEMAKI, Minoru YAMAGA
  • Publication number: 20190295584
    Abstract: A magnetic recording medium is used in a recording/reproduction apparatus having a shortest recording wavelength of not more than 75 nm, the magnetic recording medium including a recording layer that contains a powder of particles containing ?-iron oxide, in which a squareness ratio measured in a traveling direction of the magnetic recording medium is not more than 30%, a ratio (Dmax/Dmin) of an average longest diameter Dmax of the particles to an average shortest diameter Dmin of the particles satisfies a relationship of 1.0?(Dmax/Dmin)?1.1, an average thickness ?mag of the recording layer is not more than 100 nm, and a ratio (?mag/Dmin) of the average thickness ?mag of the recording layer to the average shortest diameter Dmin of the particles satisfies a relationship of ?mag/Dmin?5.
    Type: Application
    Filed: November 17, 2017
    Publication date: September 26, 2019
    Inventors: Masaru TERAKAWA, Yoichi KANEMAKI, Minoru YAMAGA
  • Publication number: 20190143637
    Abstract: A magnetic recording medium according to a first technique includes an elongated substrate having a first surface and a second surface, a first reinforcing layer disposed on the first surface, a second reinforcing layer disposed on the second surface, an adhesion suppressing layer disposed on the second reinforcing layer, and a recording layer disposed on the first reinforcing layer or the adhesion suppressing layer.
    Type: Application
    Filed: May 11, 2017
    Publication date: May 16, 2019
    Inventors: Eiji NAKASHIO, Yuta AKIMOTO, Tomoe SATO, Yoichi KANEMAKI, Nobuyuki SASAKI, Masaru TERAKAWA, Kazuya HASHIMOTO, Katsunori MAESHIMA, Minoru YAMAGA, Hikaru TERUI, Hiroyuki KOBAYASHI
  • Publication number: 20190066723
    Abstract: The magnetic recording medium includes a support and a magnetic layer containing a magnetic powder. The magnetic powder includes at least either of a magnetic particle containing a cubic ferrite and a magnetic particle containing an ?-phase iron oxide. The magnetic powder has a mean particle size of 10 nm or more and 14 nm or less, the magnetic powder has a mean aspect ratio of 0.75 or more and 1.25 or less, and the magnetic layer has a ten-point mean roughness Rz of 35 nm or less.
    Type: Application
    Filed: October 31, 2018
    Publication date: February 28, 2019
    Inventors: Eiji NAKASHIO, Minoru YAMAGA, Masaru TERAKAWA, Yoichi KANEMAKI, Katsunori MAESHIMA, Jun HASHIMOTO
  • Patent number: 10204651
    Abstract: The magnetic recording medium includes a support and a magnetic layer containing a magnetic powder. The magnetic powder includes at least either of a magnetic particle containing a cubic ferrite and a magnetic particle containing an ?-phase iron oxide. The magnetic powder has a mean particle size of 10 nm or more and 14 nm or less, the magnetic powder has a mean aspect ratio of 0.75 or more and 1.25 or less, and the magnetic layer has a ten-point mean roughness Rz of 35 nm or less.
    Type: Grant
    Filed: April 10, 2015
    Date of Patent: February 12, 2019
    Assignee: Sony Corporation
    Inventors: Eiji Nakashio, Minoru Yamaga, Masaru Terakawa, Yoichi Kanemaki, Katsunori Maeshima, Jun Hashimoto