Patents by Inventor Yuto Murata

Yuto Murata 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: 20240105227
    Abstract: The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, and a magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. In a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer with a scanning electron microscope at an acceleration voltage of 5 kV, the number of bright regions having an equivalent circle diameter of 60 nm or more and less than 120 nm is 8000 or more and 30000 or less. Standard deviation ? of the number of the bright regions in a width direction of the surface of the magnetic layer is 2000 or less.
    Type: Application
    Filed: November 30, 2023
    Publication date: March 28, 2024
    Applicant: FUJIFILM Corporation
    Inventors: Norihito KASADA, Yuto MURATA, Nagisa YAMASAKI
  • Patent number: 11887636
    Abstract: The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, and a magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. In a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer with a scanning electron microscope at an acceleration voltage of 5 kV, the number of bright regions having an equivalent circle diameter of 60 nm or more and less than 120 nm is 8000 or more and 30000 or less. Standard deviation ? of the number of the bright regions in a width direction of the surface of the magnetic layer is 2000 or less.
    Type: Grant
    Filed: April 11, 2023
    Date of Patent: January 30, 2024
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Yuto Murata, Nagisa Yamasaki
  • Publication number: 20230419993
    Abstract: The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, and a magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. The number of recesses existing on a surface of the magnetic layer and having an equivalent circle diameter of 0.15 ?m or more and 0.25 ?m or less is 100 or more and 2500 or less per an area of 40 ?m×40 ?m. Standard deviation ? of the number of the recesses in a width direction of the surface of the magnetic layer is 100 or less.
    Type: Application
    Filed: April 10, 2023
    Publication date: December 28, 2023
    Applicant: FUJIFILM Corporation
    Inventors: Nagisa YAMASAKI, Norihito KASADA, Yuto MURATA
  • Patent number: 11842752
    Abstract: The magnetic tape container includes a core around which a magnetic tape is wound. The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder, and the roundness of the trajectory of one rotation drawn by the magnetic tape in a case where the wound magnetic tape is pulled out from the core is 100 ?m or less as the arithmetic mean of the measured values at three points in the width direction of the magnetic tape.
    Type: Grant
    Filed: February 25, 2022
    Date of Patent: December 12, 2023
    Assignee: FUJIFILM Corporation
    Inventors: Shota Kamimura, Yuto Murata, Tomohide Ueyama, Norihito Kasada
  • Publication number: 20230352045
    Abstract: The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which a non-linear component of a signal phase difference generated by storage for 10 days in an environment of a temperature of 60° C. and a relative humidity of 20% is 17.5 nm or less. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape.
    Type: Application
    Filed: April 10, 2023
    Publication date: November 2, 2023
    Applicant: FUJIFILM Corporation
    Inventors: Yuto MURATA, Norihito Kasada, Nagisa Yamasaki
  • Publication number: 20230335160
    Abstract: The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which a non-linear component of tape width deformation generated by storage for 10 days in an environment of a temperature of 60° C. and a relative humidity of 20% is 100 nm or less. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape.
    Type: Application
    Filed: April 12, 2023
    Publication date: October 19, 2023
    Applicant: FUJIFILM Corporation
    Inventors: Yuto MURATA, Norihito KASADA, Nagisa YAMASAKI
  • Publication number: 20230335159
    Abstract: The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, and a magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. In a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer with a scanning electron microscope at an acceleration voltage of 5 kV, the number of bright regions having an equivalent circle diameter of 60 nm or more and less than 120 nm is 8000 or more and 30000 or less. Standard deviation ? of the number of the bright regions in a width direction of the surface of the magnetic layer is 2000 or less.
    Type: Application
    Filed: April 11, 2023
    Publication date: October 19, 2023
    Applicant: FUJIFILM Corporation
    Inventors: Norihito KASADA, Yuto MURATA, Nagisa YAMASAKI
  • Patent number: 11735219
    Abstract: The magnetic tape container includes a core around which a magnetic tape is wound. The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. A maximum value of a deviation of a center position of an average minimum region reference circle of a trajectory of one rotation drawn by the magnetic tape, in a case where the wound magnetic tape is drawn out from the core core is 100 ?m or less for three points of the magnetic tape in a width direction.
    Type: Grant
    Filed: February 25, 2022
    Date of Patent: August 22, 2023
    Assignee: FUJIFILM Corporation
    Inventors: Shota Kamimura, Yuto Murata, Tomohide Ueyama, Norihito Kasada
  • Patent number: 11735218
    Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. A dimension change amount ?w in a width direction with respect to a tension change in a longitudinal direction is 400 ppm/N to 900 ppm/N, the magnetic layer includes a plurality of servo bands, and a coefficient of variation CV calculated by Equation A: CV=(?G/?w)×100 is 10% or less. The ?G is a standard deviation of servo band intervals measured in a region of the magnetic tape over 100 m in the longitudinal direction with a tension of 0.6 N in the longitudinal direction. A magnetic tape container containing the magnetic tape.
    Type: Grant
    Filed: February 25, 2022
    Date of Patent: August 22, 2023
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Yuto Murata
  • Publication number: 20230178101
    Abstract: Provided are a magnetic tape control system that executes pre-rewinding storage of storing a magnetic tape in a state of being wound around a reel, and post-rewinding storage of storing the magnetic tape in a state of being rewound around a reel different from or the same reel as the reel after the pre-rewinding storage such that an end that is a tape outside end during the pre-rewinding storage is turned into a tape inside end and an end that is a tape inside end during the pre-rewinding storage is turned into a tape outside end, and a magnetic tape control device including a rewinding control unit that transmits rewinding execution information, and a drive unit that receives the rewinding execution information and starts running of a magnetic tape stored in a state of being wound around a reel to execute rewinding of the magnetic tape.
    Type: Application
    Filed: January 30, 2023
    Publication date: June 8, 2023
    Applicant: FUJIFILM Corporation
    Inventor: Yuto Murata
  • Publication number: 20230169997
    Abstract: Provided is a magnetic recording and reproducing device including, in a sealed space in the magnetic recording and reproducing device: a magnetic tape; and a magnetic head are provided, in which a relative humidity difference (RHC-RHB) between a relative humidity RHB in the sealed space measured in an environment of a temperature of 21° C. and a relative humidity of 50% and a relative humidity RHC in the sealed space measured in an environment of a temperature of 60° C. and a relative humidity of 5% is within ±10%.
    Type: Application
    Filed: January 27, 2023
    Publication date: June 1, 2023
    Applicant: FUJIFILM Corporation
    Inventors: Megumi NAKANO, Yuto MURATA
  • Publication number: 20230142229
    Abstract: Provided is a magnetic tape device including: a magnetic head having a magnetic element that acts on a magnetic layer formed on a front surface of a magnetic tape; and a position adjusting actuator that adjusts a position of the magnetic element in a normal direction of the front surface by moving the magnetic head; and a processor that controls an operation of the position adjusting actuator.
    Type: Application
    Filed: January 10, 2023
    Publication date: May 11, 2023
    Applicant: FUJIFILM Corporation
    Inventors: Ren ISHIKAWA, Yuto MURATA
  • Patent number: 11482249
    Abstract: A magnetic tape in which a minimum value of TDStens among five TDStens measured respectively at a temperature of 16° C. and a relative humidity of 20%, a temperature of 16° C. and a relative humidity of 80%, a temperature of 26° C. and a relative humidity of 80%, a temperature of 32° C. and a relative humidity of 20% and a temperature of 32° C. and a relative humidity of 55% is 1.43 ?m/N or more, a ratio of a change of TDStens to a change of a relative humidity obtained from the five TDStens is 0.005 ?m/N/% or less, and a ratio of a change of TDStens to a change of a temperature obtained from the five TDStens is 0.020 ?m/N/° C. or less.
    Type: Grant
    Filed: December 22, 2020
    Date of Patent: October 25, 2022
    Assignee: FUJIFILM Corporation
    Inventors: Norihito Kasada, Yuto Murata, Yusuke Kaneko
  • Publication number: 20220277770
    Abstract: The magnetic tape container includes a core around which a magnetic tape is wound. The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder, and the roundness of the trajectory of one rotation drawn by the magnetic tape in a case where the wound magnetic tape is pulled out from the core is 100 ?m or less as the arithmetic mean of the measured values at three points in the width direction of the magnetic tape.
    Type: Application
    Filed: February 25, 2022
    Publication date: September 1, 2022
    Applicant: FUJIFILM Corporation
    Inventors: Shota KAMIMURA, Yuto MURATA, Tomohide UEYAMA, Norihito KASADA
  • Publication number: 20220277769
    Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. A dimension change amount ?w in a width direction with respect to a tension change in a longitudinal direction is 400 ppm/N to 900 ppm/N, the magnetic layer includes a plurality of servo bands, and a coefficient of variation CV calculated by Equation A: CV=(?G/?w)×100 is 10% or less. The ?G is a standard deviation of servo band intervals measured in a region of the magnetic tape over 100 m in the longitudinal direction with a tension of 0.6 N in the longitudinal direction. A magnetic tape container containing the magnetic tape.
    Type: Application
    Filed: February 25, 2022
    Publication date: September 1, 2022
    Applicant: FUJIFILM Corporation
    Inventors: Norihito Kasada, Yuto Murata
  • Publication number: 20220277772
    Abstract: The magnetic tape container includes a core around which a magnetic tape is wound. The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. A maximum value of a deviation of a center position of an average minimum region reference circle of a trajectory of one rotation drawn by the magnetic tape, in a case where the wound magnetic tape is drawn out from the core core is 100 ?m or less for three points of the magnetic tape in a width direction.
    Type: Application
    Filed: February 25, 2022
    Publication date: September 1, 2022
    Applicant: FUJIFILM Corporation
    Inventors: Shota KAMIMURA, Yuto MURATA, Tomohide UEYAMA, Norihito KASADA
  • Patent number: 11295776
    Abstract: The magnetic tape satisfies TDSage+TDSenv?TC?0.30 ?m. TDSage is a maximum absolute value of a difference between the servo band interval obtained before a predetermined storage and the servo band interval obtained after the storage, TDSenv is a value calculated by multiplying a difference between a maximum value and a minimum value of the servo band interval respectively obtained under five predetermined environments by ½, TC is a value calculated by multiplying TDStens by 0.5 N, and TDStens is a ratio of a change in the servo band interval to a change in tension calculated from the servo band interval respectively obtained under five predetermined environments by applying a plurality of different tensions in the longitudinal direction of the magnetic tape.
    Type: Grant
    Filed: January 28, 2021
    Date of Patent: April 5, 2022
    Assignee: FUJIFILM Corporation
    Inventors: Yuto Murata, Yusuke Kaneko, Norihito Kasada
  • Patent number: 11289124
    Abstract: A magnetic tape device, a magnetic tape, and a magnetic tape cartridge, in which the magnetic tape is caused to run between a winding reel and a cartridge reel in a state where a tension is applied in a longitudinal direction of the magnetic tape and a maximum value of the tension is 0.50 N or more, the magnetic tape after running in a state where the tension is applied is wound around the cartridge reel by applying a tension of 0.40 N or less in the longitudinal direction, and a center line average roughness Ra measured regarding a surface of a back coating layer of the magnetic tape with an atomic force microscope is in a range of 5 to 13 nm.
    Type: Grant
    Filed: February 4, 2021
    Date of Patent: March 29, 2022
    Assignee: FUJIFILM Corporation
    Inventors: Yusuke Kaneko, Yuto Murata, Norihito Kasada
  • Patent number: 11270727
    Abstract: In the magnetic tape cartridge, a tape has a tape thickness of 5.3 ?m or less, and a difference Winner?Wouter between a tape width Winner at a position of 50 m±1 m from a tape inner end and a tape width Wouter at a position of 50 m±1 m from a tape outer end is 4.1 ?m to 19.9 ?m as a value measured on 100th day from a date of magnetic tape cartridge manufacture, and a difference Ginner?Gouter between a servo band interval Ginner in a range of 49 m to 51 m from the tape inner end and a servo band interval Gouter in a range of 49 m to 51 m from the tape outer end is ?3.9 ?m to 0.0 ?m as a value measured on 100th day from the date of magnetic tape cartridge manufacture.
    Type: Grant
    Filed: March 20, 2020
    Date of Patent: March 8, 2022
    Assignee: FUJIFILM Corporation
    Inventors: Yuto Murata, Norihito Kasada, Yusuke Kagawa
  • Patent number: 11270732
    Abstract: In the probability distribution calculated from TDSage, TDSenv, and TC, the magnetic tape has the probability Pfail of equal to or less than 0.2%, in which the absolute value of ?SB exceeds 0.3 ?m. TDSage is a maximum absolute value of a difference between the servo band interval obtained before a predetermined storage and the servo band interval obtained after the storage, TDSenv is a value calculated by multiplying a difference between a maximum value and a minimum value of the servo band interval respectively obtained under five predetermined environments by ½, TC is a value calculated by multiplying TDStens by 0.5 N, and TDStens is a ratio of a change in the servo band interval to a change in tension calculated from the servo band interval respectively obtained under five predetermined environments by applying a plurality of different tensions in the longitudinal direction of the magnetic tape.
    Type: Grant
    Filed: January 28, 2021
    Date of Patent: March 8, 2022
    Assignee: FUJIFILM Corporation
    Inventors: Yuto Murata, Yusuke Kaneko, Norihito Kasada