Patents by Inventor Eiki OZAWA

Eiki OZAWA 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: 10811048
    Abstract: The magnetic tape includes a non-magnetic support and a magnetic layer, in which the magnetic layer has a timing-based servo pattern, an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference between a value L99.9 of a cumulative distribution function of 99.9% and a value L0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and a difference between a spacing S0.5 measured, after n-hexane cleaning, on a surface of the magnetic layer under a pressure of 0.5 atm by optical interferometry and a spacing S13.5 measured, after n-hexane cleaning, under a pressure of 13.5 atm is 3.0 nm or less, and S0.5 is 5.0 nm or more.
    Type: Grant
    Filed: January 30, 2020
    Date of Patent: October 20, 2020
    Assignee: FUJIFILM Corporation
    Inventors: Eiki Ozawa, Norihito Kasada, Atsushi Musha
  • Publication number: 20200279580
    Abstract: The magnetic recording medium includes: a non-magnetic support; and a magnetic layer including ferromagnetic powder, in which a difference (S0.5?S13.5) between a spacing S0.5 measured on a surface of the magnetic layer by optical interferometry after n-hexane cleaning under a pressure of 0.5 atm and a spacing S13.5 measured on the surface of the magnetic layer by optical interferometry after n-hexane cleaning under a pressure of 13.5 atm is 9.0 nm or more.
    Type: Application
    Filed: February 27, 2020
    Publication date: September 3, 2020
    Applicant: FUJIFILM Corporation
    Inventors: Naoki SANO, Eiki OZAWA, Norihito KASADA, Takuto KUROKAWA
  • Patent number: 10755741
    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: Grant
    Filed: June 28, 2019
    Date of Patent: August 25, 2020
    Assignee: FUJIFILM Corporation
    Inventors: Eiki Ozawa, Norihito Kasada, Atsushi Musha
  • Patent number: 10755735
    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: Grant
    Filed: June 28, 2019
    Date of Patent: August 25, 2020
    Assignee: FUJIFILM Corporation
    Inventors: Eiki Ozawa, Norihito Kasada, Atsushi Musha
  • Patent number: 10741208
    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 center line average surface roughness Ra measured regarding a surface of the magnetic layer is 1.0 nm to 1.6 nm, and a difference (Safter?Sbefore) between a spacing Safter measured by optical interferometry regarding the surface of the magnetic layer after ethanol cleaning and a spacing Sbefore measured by optical interferometry regarding the surface of the magnetic layer before ethanol cleaning is greater than 0 nm and equal to or smaller than 6.0 nm.
    Type: Grant
    Filed: March 28, 2019
    Date of Patent: August 11, 2020
    Assignee: FUJIFILM Corporation
    Inventors: Takuto Kurokawa, Eiki Ozawa
  • Publication number: 20200251141
    Abstract: The magnetic tape in which the followings are satisfied, after the magnetic layer is pressed at a pressure of 70 atm. A full width at half maximum of a spacing distribution measured by optical interferometry regarding a surface of the magnetic layer before performing a vacuum heating with respect to the magnetic tape is greater than 0 nm and equal to or smaller than 15.0 nm; a full width at half maximum of a spacing distribution measured after performing the vacuum heating is greater than 0 nm and equal to or smaller than 15.0 nm; and a difference (Safter?Sbefore) between a spacing Safter measured by optical interferometry regarding the surface of the magnetic layer after performing the vacuum heating with respect to the magnetic tape and a spacing Sbefore measured before performing the vacuum heating is greater than 0 nm and equal to or smaller than 12.0 nm.
    Type: Application
    Filed: January 30, 2020
    Publication date: August 6, 2020
    Applicant: FUJIFILM Corporation
    Inventors: Eiki OZAWA, Norihito KASADA
  • Publication number: 20200251134
    Abstract: The magnetic tape includes a non-magnetic support and a magnetic layer including ferromagnetic powder and a binding agent, in which the magnetic layer has a timing-based servo pattern, an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference (L99.9?L0.1) between a value L99.9 of a cumulative distribution function of 99.9% and a value L0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and an isoelectric point of a surface zeta potential of the magnetic layer is 3.8 or less.
    Type: Application
    Filed: January 30, 2020
    Publication date: August 6, 2020
    Applicant: FUJIFILM Corporation
    Inventors: Norihito KASADA, Eiki OZAWA, Atsushi MUSHA
  • Publication number: 20200251135
    Abstract: The magnetic tape includes a non-magnetic support; and a magnetic layer, in which the magnetic layer has a timing-based servo pattern, an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference L99.9?L0.1 between a value L99.9 of a cumulative distribution function of 99.9% and a value L0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and an absolute value ?N of a difference between a refractive index Nxy of the magnetic layer, measured in an in-plane direction and a refractive index Nz of the magnetic layer, measured in a thickness direction is 0.25 or more and 0.40 or less.
    Type: Application
    Filed: January 30, 2020
    Publication date: August 6, 2020
    Applicant: FUJIFILM Corporation
    Inventors: Norihito Kasada, Eiki Ozawa, Atsushi Musha
  • Publication number: 20200251138
    Abstract: The magnetic tape includes a non-magnetic support and a magnetic layer, in which an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference between a value L99.9 of a cumulative distribution function of 99.9% and a value L0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and in which a difference between a spacing Safter measured on a surface of the magnetic layer by an optical interferometry after ethanol cleaning and a spacing Sbefore measured on the surface of the magnetic layer by an optical interferometry before ethanol cleaning is greater than 0 nm and 6.0 nm or less.
    Type: Application
    Filed: January 30, 2020
    Publication date: August 6, 2020
    Applicant: FUJIFILM Corporation
    Inventors: Eiki OZAWA, Norihito KASADA, Atsushi MUSHA
  • Publication number: 20200251139
    Abstract: The magnetic tape include a non-magnetic support and a magnetic layer including ferromagnetic powder and a binding agent, in which the magnetic layer has a timing-based servo pattern, an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference (L99.9?L0.1) between a value L99.9 of a cumulative distribution function of 99.9% and a value L0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and an isoelectric point of a surface zeta potential of the magnetic layer is 5.5 or more.
    Type: Application
    Filed: January 30, 2020
    Publication date: August 6, 2020
    Applicant: FUJIFILM Corporation
    Inventors: Norihito KASADA, Eiki OZAWA, Atsushi MUSHA
  • Publication number: 20200251140
    Abstract: The magnetic tape includes a non-magnetic support and a magnetic layer, in which the magnetic layer has a timing-based servo pattern, an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference between a value L99.9 of a cumulative distribution function of 99.9% and a value L0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and a difference between a spacing S0.5 measured, after n-hexane cleaning, on a surface of the magnetic layer under a pressure of 0.5 atm by optical interferometry and a spacing S13.5 measured, after n-hexane cleaning, under a pressure of 13.5 atm is 3.0 nm or less, and S0.5 is 5.0 nm or more.
    Type: Application
    Filed: January 30, 2020
    Publication date: August 6, 2020
    Applicant: FUJIFILM Corporation
    Inventors: Eiki Ozawa, Norihito Kasada, Atsushi Musha
  • Publication number: 20200251136
    Abstract: The magnetic tape includes a non-magnetic support; and a magnetic layer in which the magnetic layer has a timing-based servo pattern, an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference between a value L99.9 of a cumulative distribution function of 99.9% and a value L0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and a difference between a spacing Safter measured on a surface of the magnetic layer by an optical interferometry after methyl-ethyl-ketone cleaning and a spacing Sbefore measured on the surface of the magnetic layer by an optical interferometry before methyl-ethyl-ketone cleaning is greater than 0 nm and 15.0 nm or less.
    Type: Application
    Filed: January 30, 2020
    Publication date: August 6, 2020
    Applicant: FUJIFILM Corporation
    Inventors: Eiki OZAWA, Norihito Kasada, Atsushi Musha
  • Patent number: 10714139
    Abstract: The magnetic recording medium includes a non-magnetic support and a magnetic layer containing ferromagnetic powder and a binder, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer contains an abrasive, an intensity ratio of a peak intensity of a diffraction peak of (110) plane of a crystal structure of the hexagonal ferrite, determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method, to a peak intensity of a diffraction peak of (114) plane of the crystal structure is equal to or higher than 0.5 and equal to or lower than 4.0, a squareness ratio of the magnetic recording medium in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00, and a contact angle with 1-bromonaphthalene measured within a surface of the magnetic layer is in a range of 50.0° to 55.0°.
    Type: Grant
    Filed: July 17, 2018
    Date of Patent: July 14, 2020
    Assignee: FUJIFILM Corporation
    Inventors: Takuto Kurokawa, Norihito Kasada, Toshio Tada, Eiki Ozawa
  • Patent number: 10706875
    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: Grant
    Filed: June 28, 2019
    Date of Patent: July 7, 2020
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Eiki Ozawa, Atsushi Musha
  • Patent number: 10692523
    Abstract: Provided is a manufacturing method of a magnetic recording medium, in which the magnetic recording medium includes a magnetic layer including ferromagnetic powder and a binding agent on a non-magnetic support, and the magnetic layer shows a natural ferromagnetic resonance frequency equal to or greater than 30.0 GHz, the method including: forming a servo pattern on the magnetic layer by microwave-assisted recording.
    Type: Grant
    Filed: July 17, 2018
    Date of Patent: June 23, 2020
    Assignee: FUJIFILM Corporation
    Inventor: Eiki Ozawa
  • Patent number: 10692528
    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: Grant
    Filed: June 28, 2019
    Date of Patent: June 23, 2020
    Assignee: FUJIFILM Corporation
    Inventors: Eiki Ozawa, Norihito Kasada, Atsushi Musha
  • Patent number: 10679655
    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: Grant
    Filed: June 28, 2019
    Date of Patent: June 9, 2020
    Assignee: FUJIFILM Corporation
    Inventors: Eiki Ozawa, Norihito Kasada, Atsushi Musha
  • Patent number: 10679660
    Abstract: The magnetic tape includes a magnetic layer having ferromagnetic powder and a binder on a non-magnetic support, in which the magnetic layer includes a timing-based servo pattern, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder having an activation volume equal to or smaller than 1,600 nm3, and an edge shape of the timing-based servo pattern specified by a magnetic force microscope observation is a shape in which a difference (l99.9?l0.1) between a value l99.9 of a cumulative frequency function of 99.9% of a position deviation width from an ideal shape in a longitudinal direction of the magnetic tape and a value l0.1 of the cumulative frequency function of 0.1% thereof is equal to or smaller than 180 nm.
    Type: Grant
    Filed: June 13, 2019
    Date of Patent: June 9, 2020
    Assignee: FUJIFILM Corporation
    Inventors: Tetsuya Kaneko, Norihito Kasada, Eiki Ozawa
  • Patent number: 10679657
    Abstract: The magnetic tape includes a non-magnetic support; a magnetic layer including a ferromagnetic powder and a binding agent on one surface of the non-magnetic support; and a back coating layer including a non-magnetic powder and a binding agent on the other surface of the non-magnetic support, in which a center line average surface roughness Ra measured regarding a surface of the back coating layer is equal to or smaller than 7.0 nm, and a difference (Safter?Sbefore) between a spacing Safter measured by optical interferometry regarding the surface of the back coating layer after ethanol cleaning and a spacing Sbefore measured by optical interferometry regarding the surface of the back coating layer before ethanol cleaning is greater than 0 nm and equal to or smaller than 15.0 nm.
    Type: Grant
    Filed: March 28, 2019
    Date of Patent: June 9, 2020
    Assignee: FUJIFILM Corporation
    Inventors: Takuto Kurokawa, Eiki Ozawa
  • Patent number: 10657996
    Abstract: Provided is a magnetic recording medium, which is a magnetic recording medium for microwave-assisted recording and includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer shows a natural ferromagnetic resonance frequency equal to or greater than 30.0 GHz and an anisotropic magnetic field distribution equal to or smaller than 35%.
    Type: Grant
    Filed: September 5, 2018
    Date of Patent: May 19, 2020
    Assignee: FUJIFILM Corporation
    Inventor: Eiki Ozawa