Patents by Inventor Minoru Yamaga

Minoru Yamaga 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: 11514941
    Abstract: A magnetic recording medium used on a record/playback device with a minimum recording wavelength or 50 nm or shorter, the magnetic recording medium including a magnetic layer that contains a spinel-type ferrite magnetic powder, the magnetic layer having an average thickness of 85 nm or smaller, and the magnetic layer having a saturation flux density of 1600 Gauss or larger and 2000 Gauss or smaller.
    Type: Grant
    Filed: September 5, 2019
    Date of Patent: November 29, 2022
    Assignee: SONY CORPORATION
    Inventors: Masaru Terakawa, Minoru Yamaga
  • Patent number: 11508407
    Abstract: A magnetic recording medium is a magnetic recording medium having a tape-like shape and includes a base substrate and a magnetic layer provided on the base substrate. A plurality of data tracks can be formed in the magnetic layer, a width of a data track is 2900 nm or less, and in a case of defining, as wmax and wmin, a maximum value and a minimum value respectively out of average values of a width of the magnetic recording medium measured under four kinds of environment in which temperature and relative humidity are set to (10° C., 10%), (10° C., 80%), (29° C., 80%), and (45° C., 10%), wmax and wmin satisfy a relation of (wmax?wmin)/wmin?400 [ppm].
    Type: Grant
    Filed: November 26, 2018
    Date of Patent: November 22, 2022
    Assignee: Sony Corporation
    Inventors: Noboru Sekiguchi, Minoru Yamaga
  • Patent number: 11495258
    Abstract: The present technology provides a tape-shaped magnetic recording medium including: a magnetic layer; an underlayer; a base layer; and a back layer, in which the number of recesses having a depth of 20% or more of the thickness of the magnetic layer is 10 or more and 200 or less per surface area of 1600 ?m2, the base layer includes a polyester as a main component, a surface on a side of the back layer has a kurtosis of 2.0 or more and 4.4 or less, the magnetic recording medium has an average thickness tT of 5.6 ?m or less, the magnetic recording medium includes a lubricant, the magnetic recording medium has pores, and the pores have an average diameter of 6 nm or more and 11 nm or less when the diameters of the pores are measured in a state where the lubricant has been removed from the magnetic recording medium and the magnetic recording medium has been dried.
    Type: Grant
    Filed: October 3, 2019
    Date of Patent: November 8, 2022
    Assignee: Sony Group Corporation
    Inventor: Minoru Yamaga
  • Patent number: 11482245
    Abstract: A magnetic recording medium that can exhibit good traveling performance during use is provided. This magnetic recording medium is a tape-shaped magnetic recording medium, and includes a substrate, a base layer disposed on the substrate, and a magnetic layer disposed on the base layer. On the surface of the magnetic layer, recesses having a depth of 20% or more of the average thickness of the magnetic layer are formed at a ratio of 20 or more and 200 or less per 1600 ?m2. On the surface of the magnetic layer, a logarithmic decay rate determined by a pendulum viscoelasticity test at a temperature of 10° C. or higher and 45° C. or lower is 0.025 or more and 0.035 or less. A difference between a maximum value of the logarithmic decay rate and a minimum value of the logarithmic decay rate is 0 or more and 0.020 or less. The squareness ratio in the perpendicular direction is 65% or more. The average thickness of the magnetic layer is 80 nm or less. The average thickness of the magnetic recording medium is 5.
    Type: Grant
    Filed: October 1, 2019
    Date of Patent: October 25, 2022
    Assignee: Sony Group Corporation
    Inventor: Minoru Yamaga
  • Publication number: 20220328066
    Abstract: An object of the present disclosure is to provide a magnetic recording medium excellent in electro-magnetic conversion characteristic and thermal stability. The present disclosure provides a tape-shaped magnetic recording medium including: a substrate; and a magnetic layer provided over the substrate and including a magnetic powder, in which the magnetic layer has an average thickness of equal to or less than 90 nm, the magnetic powder has an average aspect ratio of from 1.0 to 3.0, the magnetic powder has an average particle volume of equal to or less than 2,300 nm3, a coercive force Hc1 in a vertical direction of the magnetic recording medium is equal to or less than 4,500 Oe, a coercive force Hc2 in a longitudinal direction of the magnetic recording medium and the coercive force Hc1 satisfy a relation of Hc2/Hc1?0.8, and the ratio Hrp/Hc1 of a residual coercive force Hrp of the magnetic recording medium measured using a pulsed magnetic field and the coercive force Hc1 is equal to or less than 2.0.
    Type: Application
    Filed: October 31, 2019
    Publication date: October 13, 2022
    Inventors: Masaru TERAKAWA, Minoru YAMAGA
  • Patent number: 11450345
    Abstract: A magnetic recording medium that can exhibit good traveling performance during use is provided. This magnetic recording medium is a tape-shaped magnetic recording medium, and includes a substrate including a polyester as a main component, a base layer disposed on the substrate, and a magnetic layer disposed on the base layer. The kurtosis of the surface of the magnetic layer is 3.0 or more. The base layer and the magnetic layer each include a lubricant including a fatty acid and a fatty acid ester. In the lubricant, a ratio of the content of the fatty acid to the content of the fatty acid ester is less than 0.6.
    Type: Grant
    Filed: October 1, 2019
    Date of Patent: September 20, 2022
    Assignee: Sony Corporation
    Inventors: Minoru Yamaga, Takanobu Iwama, Jun Takahashi
  • Patent number: 11443767
    Abstract: A magnetic recording tape having a plural-layer structure including at least a magnetic layer is provided. The tape has a total thickness of 5.6 ?m or smaller, and includes a plurality of indentations disposed in a surface of the magnetic layer. A value obtained by dividing a depth D1 of each indentation with a thickness D2 of the magnetic layer is 15% or greater. The magnetic layer includes a plurality of indentations formed therein, a plurality of the indentations each has a depth of 20% or greater of the thickness of the magnetic layer, and the number of the indentations is 55 or more per 6,400 ?m2 of a surface area of the magnetic layer.
    Type: Grant
    Filed: November 19, 2018
    Date of Patent: September 13, 2022
    Assignee: Sony Corporation
    Inventors: Minoru Yamaga, Takanobu Iwama, Jun Takahashi
  • Publication number: 20220284923
    Abstract: It is an object of the present technology to provide a magnetic recording medium that has a small total thickness and achieves excellent travelling stability. The present technology provides a tape-shaped magnetic recording medium including a magnetic layer, an underlayer, a base layer, and a back layer, in which a servo pattern is recorded in the magnetic layer, a statistical value ?SW indicating non-linearity of a servo band and being obtained from a reproduction waveform of a servo signal of the servo pattern is 24 nm or less, the base layer contains polyester as a main component, an average thickness tT of the magnetic recording medium is 5.6 ?m or less, the magnetic recording medium contains a lubricant, pores are formed in the magnetic recording medium, and an average diameter of the pores of the magnetic recording medium that is measured in a state where the lubricant has been removed from the magnetic recording medium and the magnetic recording medium has been dried, is 6 nm or more and 11 nm or less.
    Type: Application
    Filed: October 18, 2019
    Publication date: September 8, 2022
    Inventors: Minoru YAMAGA, Noboru SEKIGUCHI
  • Publication number: 20220284924
    Abstract: Provided is a magnetic recording medium capable of implementing higher-density recording. This magnetic recording medium is a tape-shaped magnetic recording medium, and includes a substrate containing a polyester as a main component and a magnetic layer disposed on the substrate, including a plurality of types of magnetic powder, and capable of recording a data signal. A surface of the magnetic layer has an arithmetic average roughness Ra of 2.5 nm or less. PSD to a spatial wavelength of 5 ?m is 2.5 ?m or less. The magnetic layer has an average thickness of 90 nm or less. The magnetic powder has an average aspect ratio of 1.0 or more and 3.0 or less. A coercive force in a perpendicular direction is 3000 oersted or less. A ratio of a coercive force in a longitudinal direction to the coercive force in the perpendicular direction is 0.8 or less. A half-value width of an isolated waveform in a reproduced waveform of the data signal is 200 nm or less.
    Type: Application
    Filed: October 31, 2019
    Publication date: September 8, 2022
    Inventors: Masaru TERAKAWA, Minoru YAMAGA
  • 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
  • Publication number: 20220270642
    Abstract: A magnetic recording medium is a magnetic recording medium in the form of a tape and includes a substrate, a foundation layer provided on the substrate, and a magnetic layer provided on the foundation layer and containing a magnetic powder. The foundation layer and the magnetic layer each contain a lubricant. A squareness ratio of the magnetic layer in a perpendicular direction is equal to or higher than 65%, an average thickness of the magnetic recording medium is equal to or smaller than 5.6 ?m, a plurality of recessed portions each having a depth corresponding to 20% or higher of the average thickness of the magnetic layer is provided on a surface of the magnetic layer, and the number of the recessed portions per unit area of 1,600 ?m2 of the surface of the magnetic layer is equal to or greater than 20 and equal to or smaller than 200, and an amount of exudation of the lubricant per unit region of 12.5 ?m×9.3 ?m on the surface of the magnetic layer in a vacuum is equal to or greater than 3.
    Type: Application
    Filed: October 2, 2019
    Publication date: August 25, 2022
    Inventors: Minoru YAMAGA, Futoshi SASAKI
  • Publication number: 20220270643
    Abstract: It is an object of the present technology to provide a magnetic recording medium having a small total thickness, which can be reproduced satisfactorily after long-term storage. The present technology provides a tape-shaped magnetic recording medium including a magnetic layer, an underlayer, a base layer, and a back layer. The magnetic recording medium has an average thickness tT of 5.4 ?m or less, when a thermomechanical analysis is performed on the magnetic recording medium in a temperature range of 40° C. to 150° C. at a temperature rise rate of 1° C./minute, a switching temperature for switching from thermal expansion to thermal contraction is 70° C. or more, and a contraction start temperature is 90° C. or more at which a length in a longitudinal direction is shorter than the length at 40° C., and a Poisson's ratio is 0.40 or less.
    Type: Application
    Filed: October 8, 2020
    Publication date: August 25, 2022
    Inventors: Minoru YAMAGA, Tooru SATO, Kanako HASHIMOTO
  • Publication number: 20220254374
    Abstract: It is an object to provide a magnetic recording medium that enables good reproduction even after long-term preservation and that has a small overall thickness. The present technology provides a tape-shaped magnetic recording medium including a magnetic layer, a ground layer, a base layer, and a back layer, in which an average thickness tT of the magnetic recording medium is equal to or less than 5.3 ?m, and, when the magnetic recording medium is subjected to dynamic viscoelasticity measurement at a frequency of 10 Hz and a temperature rise rate of 2° C./min, a difference between a maximum and a minimum of a viscosity term E? in a temperature range of 0° C. to 80° C. is equal to or less than 0.18 GPa. In addition, the present technology also provides a tape cartridge including the tape-shaped magnetic recording medium.
    Type: Application
    Filed: June 17, 2020
    Publication date: August 11, 2022
    Inventors: Minoru YAMAGA, Tooru SATO, Kanako HASHIMOTO
  • Publication number: 20220254370
    Abstract: [Solving Means] A cartridge according to the present technology includes: a cartridge case; and a memory. The cartridge case houses a magnetic tape. The memory is provided in the cartridge case, the memory storing information before data recording by the magnetic tape, the information being for adjusting, during data recording or during data reproduction by the magnetic tape, a width of the magnetic tape.
    Type: Application
    Filed: January 6, 2020
    Publication date: August 11, 2022
    Inventors: Minoru YAMAGA, Eiji NAKASHIO, Kazuo ANNO, Takanobu IWAMA, Naohiro ADACHI, Shinya TOCHIKUBO
  • Publication number: 20220230660
    Abstract: A magnetic recording medium is provided and includes a layer structure including a magnetic layer, a non-magnetic layer, and a base layer in order, in which an average thickness tT of the magnetic recording medium is 4.0 ?m?tT?5.3 ?m, a dimensional variation ?w in a width direction of the magnetic recording medium to tension change in a longitudinal direction of the magnetic recording medium is 680 ppm/N??w?2000 ppm/N , and an average thickness tn of the non-magnetic layer is tn?1.0 ?m.
    Type: Application
    Filed: April 7, 2022
    Publication date: July 21, 2022
    Inventors: Masaru TERAKAWA, Minoru YAMAGA
  • Patent number: 11393506
    Abstract: [Object] A cartridge memory according to an embodiment of the present technology is a cartridge memory for a recording medium cartridge, including: a memory unit; and a capacity setting unit. The memory unit has a memory capacity capable of storing management information relating to a second information recording medium configured to be capable of recording information with a second data track number larger than a first data track number. The capacity setting unit is configured to be capable of setting a data storage area limited to a first capacity capable of storing management information relating to a first information recording medium configured to be capable of recording information with the first data track number.
    Type: Grant
    Filed: March 31, 2021
    Date of Patent: July 19, 2022
    Assignee: Sony Corporation
    Inventors: Eiji Nakashio, Kazuo Anno, Takanobu Iwama, Shinya Tochikubo, Naohiro Adachi, Minoru Yamaga, Masayoshi Abe
  • Publication number: 20220208221
    Abstract: A magnetic recording medium that can exhibit good traveling performance during use is provided. This magnetic recording medium is a tape-shaped magnetic recording medium, and includes a substrate, a base layer disposed on the substrate, and a magnetic layer disposed on the base layer. On the surface of the magnetic layer, recesses having a depth of 20% or more of the average thickness of the magnetic layer are formed at a ratio of 20 or more and 200 or less per 1600 ?m2. On the surface of the magnetic layer, a logarithmic decay rate determined by a pendulum viscoelasticity test at a temperature of 10° C. or higher and 45° C. or lower is 0.025 or more and 0.040 or less. A difference between a maximum value of the logarithmic decay rate and a minimum value of the logarithmic decay rate is 0 or more and 0.020 or less. The squareness ratio in the perpendicular direction is 65% or more. The average thickness of the magnetic layer is 80 nm or less. The average thickness of the magnetic recording medium is 5.
    Type: Application
    Filed: October 1, 2019
    Publication date: June 30, 2022
    Inventor: Minoru YAMAGA
  • Publication number: 20220208222
    Abstract: A magnetic recording medium that can exhibit good traveling performance during use is provided. This magnetic recording medium is a tape-shaped magnetic recording medium, and includes a substrate including a polyester as a main component, a base layer disposed on the substrate, a magnetic layer disposed on the base layer, and a back layer disposed on a side of the substrate opposite to the base layer. A surface of the back layer opposite to the substrate has a kurtosis of 2.0 or more. On a surface of the magnetic layer, recesses having a depth of 20% or more of the average thickness of the magnetic layer are formed at a ratio of 10 or more and 200 or less per 1600 ?m2. A surface of the magnetic layer has arithmetic average roughness Ra of 2.5 nm or less. The entire magnetic recording medium has a BET specific surface area of 3.5 m2/g or more in a state where the lubricant has been removed from the magnetic recording medium and the magnetic recording medium has been dried.
    Type: Application
    Filed: October 1, 2019
    Publication date: June 30, 2022
    Inventors: Minoru YAMAGA, Takanobu IWAMA, Jun TAKAHASHI
  • Publication number: 20220208227
    Abstract: An object is to provide a magnetic recording medium having excellent traveling stability and a thin total thickness. The present technology provides a tape-shaped magnetic recording medium including: a magnetic layer; an underlayer; a base layer; and a back layer, in which the number of recesses having a depth of 20% or more of the thickness of the magnetic layer is 10 or more and 200 or less per surface area of 1600 ?m2, the base layer includes a polyester as a main component, a surface on a side of the back layer has a kurtosis of 2.0 or more and 4.4 or less, the magnetic recording medium has an average thickness tT of 5.6 ?m or less, the magnetic recording medium includes a lubricant, the magnetic recording medium has pores, and the pores have an average diameter of 6 nm or more and 11 nm or less when the diameters of the pores are measured in a state where the lubricant has been removed from the magnetic recording medium and the magnetic recording medium has been dried.
    Type: Application
    Filed: October 3, 2019
    Publication date: June 30, 2022
    Inventor: Minoru YAMAGA
  • Patent number: 11373681
    Abstract: A cartridge memory used for a tape cartridge, the cartridge memory including a communication unit that performs wireless communication, a control unit that transmits data to a recording/reproduction device according to a first communication standard via the communication unit, receives data from the recording/reproduction device according to the first communication standard via the communication unit, and transmits data to an information terminal according to a second communication standard via the communication unit, and a storage unit that stores data related to the tape cartridge.
    Type: Grant
    Filed: August 2, 2019
    Date of Patent: June 28, 2022
    Assignee: Sony Corporation
    Inventors: Shinya Tochikubo, Takanobu Iwama, Kazuo Anno, Eiji Nakashio, Naohiro Adachi, Minoru Yamaga, Masayoshi Abe, Munetake Ebihara