Patents by Inventor Norihito KASADA

Norihito KASADA 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).

  • Publication number: 20200090694
    Abstract: The magnetic recording medium includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, in which a difference (S0.5?S13.5) between a spacing S0.5 measured by optical interferometry regarding a surface of the magnetic layer under a pressing force of 0.5 atm after n-hexane cleaning and a spacing S13.5 measured by optical interferometry regarding the surface of the magnetic layer under a pressing force of 13.5 atm after n-hexane cleaning is equal to or smaller than 3.0 nm, and a magnetic recording and reproducing device including this magnetic recording medium.
    Type: Application
    Filed: September 12, 2019
    Publication date: March 19, 2020
    Applicant: FUJIFILM Corporation
    Inventors: Naoki SANO, Takuto Kurokawa, Norihito Kasada, Eiki Ozawa
  • Patent number: 10573341
    Abstract: The magnetic tape has a nonmagnetic layer containing nonmagnetic powder and binder on a nonmagnetic support and a magnetic layer containing ferromagnetic powder and binder on the nonmagnetic layer, wherein a fatty acid ester is contained in at least the magnetic layer, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the ferromagnetic hexagonal ferrite powder has a crystallite volume as determined by X-ray diffraction analysis ranges from 1,000 nm3 to 2,400 nm3, and a ratio of the crystallite size Dx(107) obtained from a diffraction peak of a (107) plane to a particle size in a direction of an easy axis of magnetization DTEM as determined by observation with a transmission electron microscope, Dx(107)/DTEM, is greater than or equal to 1.1, and ?SFD in a longitudinal direction of the magnetic tape as calculated with Equation 1: ?SFD=SFD25° C.?SFD?190° C., ranges from 0.50 to 1.60.
    Type: Grant
    Filed: December 22, 2016
    Date of Patent: February 25, 2020
    Assignee: FUJIFILM Corporation
    Inventors: Toshio Tada, Norihito Kasada, Masahito Oyanagi
  • Patent number: 10573338
    Abstract: A magnetic tape device includes a magnetic tape; and a reproducing head, in which the reproducing head is a Tunneling Magnetoresistive (TMR) head, the center line average surface roughness Ra measured regarding the surface of the magnetic layer of the magnetic tape is equal to or smaller than 2.0 nm, the logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050, and the ratio (Sdc/Sac) of an average area Sdc of a magnetic cluster of the magnetic tape in a DC demagnetization state and an average area Sac of a magnetic cluster of the magnetic tape in an AC demagnetization state measured with a magnetic force microscope is 0.80 to 1.30.
    Type: Grant
    Filed: February 20, 2018
    Date of Patent: February 25, 2020
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Eiki Ozawa
  • Publication number: 20200035262
    Abstract: The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which an absolute value ?N of a difference between a refractive index Nxy measured regarding an in-plane direction of the magnetic layer and a refractive index Nz measured regarding a thickness direction of the magnetic layer is 0.25 to 0.40, and a coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.30, a magnetic tape cartridge and a magnetic tape apparatus including this magnetic tape.
    Type: Application
    Filed: July 26, 2019
    Publication date: January 30, 2020
    Applicant: FUJIFILM Corporation
    Inventor: Norihito KASADA
  • Publication number: 20200035265
    Abstract: The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer has a servo pattern, and an absolute value ?N of a difference between a refractive index Nxy measured regarding an in-plane direction of the magnetic layer and a refractive index Nz measured regarding a thickness direction of the magnetic layer is 0.25 to 0.40, a magnetic tape cartridge and a magnetic tape apparatus including this magnetic tape.
    Type: Application
    Filed: July 26, 2019
    Publication date: January 30, 2020
    Applicant: FUJIFILM Corporation
    Inventor: Norihito Kasada
  • Publication number: 20200035267
    Abstract: The magnetic tape includes a non-magnetic support; a magnetic layer including ferromagnetic powder and a binding agent on one surface side of the non-magnetic support; and a back coating layer including non-magnetic powder and a binding agent on the other surface side of the non-magnetic support, in which an isoelectric point of a surface zeta potential of the magnetic layer is equal to or smaller than 3.8, and an isoelectric point of a surface zeta potential of the back coating layer is equal to or smaller than 3.0, a magnetic tape cartridge, and a magnetic tape apparatus including this magnetic tape.
    Type: Application
    Filed: July 26, 2019
    Publication date: January 30, 2020
    Applicant: FUJIFILM Corporation
    Inventor: Norihito KASADA
  • Patent number: 10546602
    Abstract: The magnetic tape device includes a Tunneling Magnetoresistive (TMR) head as a reproducing head; and a magnetic tape which includes a non-magnetic support, and a magnetic layer including ferromagnetic hexagonal ferrite powder and a binding agent on the non-magnetic support, an XRD intensity ratio (Int(110)/Int(114)) of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.0 nm, and a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050.
    Type: Grant
    Filed: February 20, 2018
    Date of Patent: January 28, 2020
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Eiki Ozawa
  • Patent number: 10546605
    Abstract: The magnetic tape device includes a magnetic tape and a TMR head (servo head), in which the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an intensity ratio of a peak intensity Int(110) of a diffraction peak of a (110) plane with respect to a peak intensity Int(114) of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, and a vertical direction squareness ratio of the magnetic tape is 0.65 to 1.00.
    Type: Grant
    Filed: March 14, 2018
    Date of Patent: January 28, 2020
    Assignee: FUJIFILM Corporation
    Inventors: Eiki Ozawa, Norihito Kasada
  • Patent number: 10540996
    Abstract: A magnetic tape has a magnetic layer containing ferromagnetic powder and binder on a nonmagnetic support. The magnetic layer contains a fatty acid ester. The full width at half maximum of the spacing distribution as measured by optical interferometry on the magnetic layer side surface of the magnetic tape before vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 5.0 nm. The full width at half maximum of the spacing distribution after vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 5.0 nm. The difference between the spacing Safter after vacuum heating the magnetic tape and the spacing Sbefore before vacuum heating the magnetic tape, Safter?Sbefore, is greater than 0 nm but less than or equal to 8.0 nm.
    Type: Grant
    Filed: September 29, 2016
    Date of Patent: January 21, 2020
    Assignee: FUJIFILM Corporation
    Inventors: Eiki Ozawa, Norihito Kasada, Masahito Oyanagi, Toshio Tada
  • Patent number: 10529368
    Abstract: A magnetic tape includes: a non-magnetic support; a magnetic layer on one surface side of the non-magnetic support; and a back coating layer on the other surface side. The center line average surface roughness Ra measured regarding the surface of the magnetic layer is 1.0 nm to 1.8 nm. The magnetic layer includes ferromagnetic hexagonal ferrite powder and non-magnetic powder. The tilt cos ? of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed using a scanning transmission electron microscope is 0.85 to 1.00. Further, the logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the back coating layer is less than or equal to 0.060.
    Type: Grant
    Filed: August 30, 2017
    Date of Patent: January 7, 2020
    Assignee: FUJIFILM Corporation
    Inventor: Norihito Kasada
  • Publication number: 20200005828
    Abstract: A magnetic tape apparatus, in which full widths at half maximum of spacing distribution measured by optical interferometry regarding a surface of a magnetic layer before and after performing a vacuum heating with respect to the magnetic tape are greater than 0 nm and equal to or smaller than 15.0 nm, a difference between spacings measured by optical interferometry regarding the surface of the magnetic layer before and after performing the vacuum heating is greater than 0 nm and equal to or smaller than 12.0 nm, and the extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result.
    Type: Application
    Filed: June 28, 2019
    Publication date: January 2, 2020
    Applicant: FUJIFILM Corporation
    Inventors: Eiki OZAWA, Norihito KASADA, Atsushi MUSHA
  • Publication number: 20200005818
    Abstract: A magnetic tape apparatus includes a magnetic tape, a reading element unit and an extraction unit, in which the magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding a surface of the magnetic layer is equal to or smaller than 0.050, and an extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result.
    Type: Application
    Filed: June 28, 2019
    Publication date: January 2, 2020
    Applicant: FUJIFILM Corporation
    Inventors: Norihito KASADA, Eiki Ozawa, Atsushi Musha
  • Publication number: 20200005822
    Abstract: A magnetic tape apparatus, in which an intensity ratio of peak intensity of diffraction peak of (110) plane with respect to peak intensity of diffraction peak of (114) plane of a hexagonal ferrite crystal structure obtained by XRD analysis of the magnetic layer by In-Plane method is 0.5 to 4.0, a vertical squareness ratio of the magnetic tape is 0.65 to 1.00, a reading element unit includes a plurality of reading elements each of which reads data by a linear scanning method from a specific track region including a reading target track in a track region included in the magnetic tape, and an extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result.
    Type: Application
    Filed: June 28, 2019
    Publication date: January 2, 2020
    Applicant: FUJIFILM Corporation
    Inventors: Norihito KASADA, Eiki OZAWA, Atsushi MUSHA
  • Publication number: 20200005820
    Abstract: A magnetic tape apparatus, in which a tilt cos ? of the hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation by STEM is 0.85 to 1.00, a reading element unit includes a plurality of reading elements each of which reads data by a linear scanning method from a specific track region including a reading target track in a track region included in the magnetic tape, an extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result, and the deviation amount is determined in accordance with a result obtained by reading of the servo pattern included in the magnetic layer by a servo element.
    Type: Application
    Filed: June 28, 2019
    Publication date: January 2, 2020
    Applicant: FUJIFILM Corporation
    Inventors: Eiki OZAWA, Norihito KASADA, Atsushi MUSHA
  • Publication number: 20200005817
    Abstract: A magnetic tape apparatus, in which a magnetic tape includes a servo pattern in a magnetic layer, ?SFD in a longitudinal direction of the magnetic tape is equal to or smaller than 0.50, a reading element unit includes a plurality of reading elements each of which reads data by a linear scanning method from a specific track region including a reading target track in a track region included in the magnetic tape, an extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result, and the deviation amount is determined in accordance with a result obtained by reading of the servo pattern included in the magnetic layer of the magnetic tape by a servo element.
    Type: Application
    Filed: June 28, 2019
    Publication date: January 2, 2020
    Applicant: FUJIFILM Corporation
    Inventors: Eiki OZAWA, Norihito KASADA, Atsushi MUSHA
  • Publication number: 20200005814
    Abstract: A magnetic tape apparatus includes a magnetic tape, a reading element unit and an extraction unit, in which a C-H derived C concentration calculated from a C-H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer of the magnetic tape at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %, and the extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result.
    Type: Application
    Filed: June 28, 2019
    Publication date: January 2, 2020
    Applicant: FUJIFILM Corporation
    Inventors: Norihito Kasada, Eiki Ozawa, Atsushi Musha
  • Publication number: 20200005827
    Abstract: A magnetic tape apparatus includes a magnetic tape, a reading element unit and an extraction unit, in which a coefficient of friction measured regarding a base portion of a surface of the magnetic layer is equal to or smaller than 0.35, the reading element unit includes a plurality of reading elements each of which reads data by a linear scanning method from a specific track region including a reading target track in a track region included in the magnetic tape, and the extraction unit performs a waveform equalization process according to a deviation amount between positions of the magnetic tape and the reading element unit, with respect to each reading result for each reading element, to extract data derived from the reading target track from the reading result.
    Type: Application
    Filed: June 28, 2019
    Publication date: January 2, 2020
    Applicant: FUJIFILM Corporation
    Inventors: Eiki Ozawa, Norihito Kasada, Atsushi Musha
  • Patent number: 10522179
    Abstract: A magnetic tape is provided in which the total thickness of the non-magnetic layer and the magnetic layer is equal to or smaller than 0.60 ?m. The magnetic layer includes ferromagnetic hexagonal ferrite powder and an abrasive. The percentage of a plan view maximum area of the abrasive confirmed in a region having a size of 4.3 ?m×6.3 ?m of the surface of the magnetic layer by plane observation using a scanning electron microscope, with respect to the total area of the region, is equal to or greater than 0.02% and less than 0.06%. Further, the tilt cos ? of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 1.00.
    Type: Grant
    Filed: August 30, 2017
    Date of Patent: December 31, 2019
    Assignee: FUJIFILM Corporation
    Inventor: Norihito Kasada
  • Patent number: 10522171
    Abstract: A magnetic tape includes a non-magnetic support; a non-magnetic layer including non-magnetic powder and a binder on the non-magnetic support; and a magnetic layer including ferromagnetic powder and a binder on the non-magnetic layer. The total thickness of the non-magnetic layer and the magnetic layer is less than or equal to 0.60 ?m. The magnetic layer includes a timing-based servo pattern, and the logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is less than or equal to 0.050.
    Type: Grant
    Filed: June 20, 2017
    Date of Patent: December 31, 2019
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Tetsuya Kaneko, Eiki Ozawa
  • Patent number: 10522180
    Abstract: The magnetic tape has a nonmagnetic layer containing nonmagnetic powder and binder on a nonmagnetic support, and a magnetic layer containing ferromagnetic powder and binder on the nonmagnetic layer; wherein the combined thickness of the nonmagnetic layer and the magnetic layer is less than or equal to 0.60 ?m, the coefficient of friction as measured on the base portion of the surface of the magnetic layer is less than or equal to 0.35, at least the magnetic layer contains one or more components selected from the group consisting of a fatty acid and a fatty acid amide, and a C—H derived carbon, C, concentration calculated from a C—H peak area ratio in a C1s spectrum obtained by X-ray photoelectron spectroscopy conducted at a photoelectron take-off angle of 10 degrees on the surface of the magnetic layer is greater than or equal to 45 atom %.
    Type: Grant
    Filed: December 15, 2016
    Date of Patent: December 31, 2019
    Assignee: FUJIFILM Corporation
    Inventor: Norihito Kasada