Patents by Inventor So MATSUYAMA
So MATSUYAMA 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).
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Publication number: 20240112698Abstract: The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which an arithmetic average roughness Ra measured on a surface of the magnetic layer is 1.5 nm or less, and standard deviation a of the Ra in a width direction of the surface of the magnetic layer is 0.20 nm or less.Type: ApplicationFiled: September 1, 2023Publication date: April 4, 2024Applicant: FUJIFILM CorporationInventors: Yujin SHIBATA, Norihito KASADA, Takuto KUROKAWA, So MATSUYAMA
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Publication number: 20240112697Abstract: The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which an AlFeSil abrasion value measured on a surface of the magnetic layer is 20 ?m or more and 50 ?m or less, and standard deviation a of the AlFeSil abrasion value obtained in a width direction of the surface of the magnetic layer is 5.0 ?m or less.Type: ApplicationFiled: September 14, 2023Publication date: April 4, 2024Applicant: FUJIFILM CorporationInventors: Takuto KUROKAWA, Yujin SHIBATA, Norihito KASADA, So MATSUYAMA
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Publication number: 20240105223Abstract: The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which a contact angle with 1-bromonaphthalene, which is measured on a surface of the magnetic layer, is 45.0° or more and 55.0° or less, and standard deviation ? of the contact angle in a width direction of the surface of the magnetic layer is 1.0° or less.Type: ApplicationFiled: September 14, 2023Publication date: March 28, 2024Applicant: FUJIFILM CorporationInventors: Norihito KASADA, Yujin SHIBATA, Takuto KUROKAWA, So MATSUYAMA
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Publication number: 20240096365Abstract: The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which a contact angle with water, which is measured on a surface of the magnetic layer, is 95° or more and 105° or less, and standard deviation a of the contact angle in a width direction of the surface of the magnetic layer is 1.0° or less.Type: ApplicationFiled: September 14, 2023Publication date: March 21, 2024Applicant: FUJIFILM CorporationInventors: So MATSUYAMA, Takuto KUROKAWA, Norihito KASADA, Yujin SHIBATA
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Patent number: 11862214Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder, in which an edge portion Ra which is an arithmetic average roughness Ra measured at an edge portion of a surface of the magnetic layer is 1.50 nm or less, a central portion Ra which is an arithmetic average roughness Ra measured at a central portion of the surface of the magnetic layer is 0.30 nm to 1.30 nm, and a Ra ratio (central portion Ra/edge portion Ra) is 0.75 to 0.95.Type: GrantFiled: September 26, 2022Date of Patent: January 2, 2024Assignee: FUJIFILM CorporationInventors: Yujin Shibata, Norihito Kasada, Takuto Kurokawa, So Matsuyama
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Publication number: 20230099064Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder, in which an edge portion Ra which is an arithmetic average roughness Ra measured at an edge portion of a surface of the magnetic layer is 1.50 nm or less, a central portion Ra which is an arithmetic average roughness Ra measured at a central portion of the surface of the magnetic layer is 0.30 nm to 1.30 nm, and a Ra ratio (central portion Ra/edge portion Ra) is 0.75 to 0.95.Type: ApplicationFiled: September 26, 2022Publication date: March 30, 2023Applicant: FUJIFILM CorporationInventors: Yujin SHIBATA, Norihito KASADA, Takuto KUROKAWA, So MATSUYAMA
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Patent number: 11538494Abstract: In the magnetic recording and reproducing device, a distal end width of the first magnetic pole in the recording element is substantially the same as a distal end width of the second magnetic pole; the reproducing element width of the reproducing element is equal to or less than 0.8 ?m; and in the magnetic recording medium, a number distribution A of equivalent circle diameters of a plurality of bright areas 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, and a number distribution B of equivalent circle diameters of a plurality of dark areas in a binarized image of a secondary electron image obtained by imaging the surface of the magnetic layer with a scanning electron microscope at an acceleration voltage of 2 kV satisfy predetermined number distribution, respectively.Type: GrantFiled: January 22, 2021Date of Patent: December 27, 2022Assignee: FUJIFILM CorporationInventors: Atsushi Musha, So Matsuyama, Norihito Kasada
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Publication number: 20220270644Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. A rate of change (AlFeSil abrasion value 2/AlFeSil abrasion value 1) in AlFeSil abrasion value measured on a surface of the magnetic layer before and after storage of the magnetic tape in an environment of a temperature of 23° C. and a relative humidity of 50% is 0.7 or more.Type: ApplicationFiled: February 16, 2022Publication date: August 25, 2022Applicant: FUJIFILM CorporationInventors: Takuto KUROKAWA, Norihito KASADA, So MATSUYAMA
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Publication number: 20220254373Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer including a ferromagnetic powder. A rate of change in friction coefficient on an LTO8 head measured on a surface of the magnetic layer before and after storage of the magnetic tape is 0.7 or more.Type: ApplicationFiled: February 8, 2022Publication date: August 11, 2022Applicant: FUJIFILM CorporationInventors: Takuto Kurokawa, So Matsuyama, Norihito Kasada
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Patent number: 11348604Abstract: The magnetic recording and reproducing device includes a magnetic recording medium, a recording element, and a reproducing element. The recording element is an inductive recording element having a first magnetic pole which generates a magnetic field, and a second magnetic pole which is spaced apart from the first magnetic pole with a write gap interposed therebetween, a tip width of the first magnetic pole is substantially the same as a tip width of the second magnetic pole, and a reproducing element width of the reproducing element is 0.5 ?m to 0.8 ?m. The magnetic recording medium has a non-magnetic support, and a magnetic layer containing a ferromagnetic powder, and the number of recesses, which are present in a surface of the magnetic layer and have an equivalent circle diameter of 0.20 ?m to 0.50 ?m, is 10 to 500 per area of 40 ?m×40 ?m.Type: GrantFiled: June 4, 2021Date of Patent: May 31, 2022Assignee: FUJIFILM CorporationInventors: So Matsuyama, Norihito Kasada, Takuto Kurokawa
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Patent number: 11276429Abstract: The magnetic recording medium includes: a non-magnetic support; and a magnetic layer including ferromagnetic powder, in which the magnetic layer includes a compound having a salt structure, and the salt structure is an ammonium salt structure of an alkyl ester anion represented by the following Formula 1. In Formula 1, R represents an alkyl group having 7 or more carbon atoms or a fluorinated alkyl group having 7 or more carbon atoms, Z+ represents an ammonium cation, and a water contact angle on a surface of the magnetic layer is 80° or more and less than 100°. A magnetic recording and reproducing apparatus includes the magnetic recording medium.Type: GrantFiled: March 26, 2020Date of Patent: March 15, 2022Assignee: FUJIFILM CorporationInventors: Wataru Kikuchi, So Matsuyama
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Patent number: 11264054Abstract: In the magnetic recording medium, a number distribution A of a plurality of bright regions, based on equivalent circle diameters thereof, in a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer by a scanning electron microscope at an acceleration voltage of 5 kV and a number distribution B of a plurality of dark regions, based on equivalent circle diameters thereof, in a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer by a scanning electron microscope at an acceleration voltage of 2 kV respectively satisfy a predetermined number distribution.Type: GrantFiled: January 22, 2021Date of Patent: March 1, 2022Assignee: FUJIFILM CorporationInventors: Norihito Kasada, So Matsuyama, Atsushi Musha, Shota Kamimura
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Publication number: 20220020393Abstract: The magnetic tape includes a non-magnetic support and a magnetic layer including a ferromagnetic powder, in which in an environment of a temperature of 23° C. and a relative humidity of 50%, an AlFeSil abrasion value0.2 N on a magnetic layer surface, which is measured by applying a tension of 0.2 N in a longitudinal direction of the magnetic tape, is in a range of 20 to 50 ?m, and an AlFeSil abrasion value1.5 N on the magnetic layer surface measured by applying a tension of 1.5 N in the longitudinal direction of the magnetic tape is in a range of 20 to 50 ?m.Type: ApplicationFiled: July 15, 2021Publication date: January 20, 2022Applicant: FUJIFILM CorporationInventors: Takuto KUROKAWA, So MATSUYAMA, Norihito KASADA
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Publication number: 20220020392Abstract: The magnetic tape includes a non-magnetic support and a magnetic layer including a ferromagnetic powder, in which in an environment of a temperature of 32° C. and a relative humidity of 80%, a frictional force F0.2 N on a magnetic layer surface with respect to an LTO8 head, which is measured by applying a tension of 0.2 N in a longitudinal direction of the magnetic tape, is in a range of 4 to 15 gf, and a frictional force F1.5 N on the magnetic layer surface with respect to the LTO8 head, which is measured by applying a tension of 1.5 N in the longitudinal direction of the magnetic tape, is in a range of 4 to 15 gf.Type: ApplicationFiled: July 15, 2021Publication date: January 20, 2022Applicant: FUJIFILM CorporationInventors: Takuto KUROKAWA, So MATSUYAMA, Norihito KASADA
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Publication number: 20210398555Abstract: The magnetic recording and reproducing device includes a magnetic recording medium, a recording element, and a reproducing element. The recording element is an inductive recording element having a first magnetic pole which generates a magnetic field, and a second magnetic pole which is spaced apart from the first magnetic pole with a write gap interposed therebetween, a tip width of the first magnetic pole is substantially the same as a tip width of the second magnetic pole, and a reproducing element width of the reproducing element is 0.5 ?m to 0.8 ?m. The magnetic recording medium has a non-magnetic support, and a magnetic layer containing a ferromagnetic powder, and the number of recesses, which are present in a surface of the magnetic layer and have an equivalent circle diameter of 0.20 ?m to 0.50 ?m, is 10 to 500 per area of 40 ?m×40 ?m.Type: ApplicationFiled: June 4, 2021Publication date: December 23, 2021Applicant: FUJIFILM CorporationInventors: So MATSUYAMA, Norihito KASADA, Takuto KUROKAWA
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Publication number: 20210383827Abstract: The magnetic recording and reproducing device includes a magnetic recording medium, a recording element, and a reproducing element. The recording element is an inductive recording element having a first magnetic pole which generates a magnetic field, and a second magnetic pole which is spaced apart from the first magnetic pole with a write gap interposed therebetween, a tip width of the first magnetic pole is substantially the same as a tip width of the second magnetic pole, and a reproducing element width of the reproducing element is 0.2 ?m or greater and less than 0.5 ?m. In the magnetic recording medium, the number of recesses, which are present in a surface of the magnetic layer and have an equivalent circle diameter of 0.10 ?m or greater and less than 0.20 ?m, is 100 to 2,000 per area of 40 ?m×40 ?m.Type: ApplicationFiled: June 4, 2021Publication date: December 9, 2021Applicant: FUJIFILM CorporationInventors: So MATSUYAMA, Norihito KASADA, Takuto KUROKAWA
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Publication number: 20210233565Abstract: In the magnetic recording medium, a number distribution A of a plurality of bright regions, based on equivalent circle diameters thereof, in a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer by a scanning electron microscope at an acceleration voltage of 5 kV and a number distribution B of a plurality of dark regions, based on equivalent circle diameters thereof, in a binarized image of a secondary electron image obtained by imaging a surface of the magnetic layer by a scanning electron microscope at an acceleration voltage of 2 kV respectively satisfy a predetermined number distribution.Type: ApplicationFiled: January 22, 2021Publication date: July 29, 2021Applicant: FUJIFILM CorporationInventors: Norihito KASADA, So MATSUYAMA, Atsushi MUSHA, Shota KAMIMURA
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Publication number: 20210233563Abstract: In the magnetic recording and reproducing device, a distal end width of the first magnetic pole in the recording element is substantially the same as a distal end width of the second magnetic pole; the reproducing element width of the reproducing element is equal to or less than 0.8 ?m; and in the magnetic recording medium, a number distribution A of equivalent circle diameters of a plurality of bright areas 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, and a number distribution B of equivalent circle diameters of a plurality of dark areas in a binarized image of a secondary electron image obtained by imaging the surface of the magnetic layer with a scanning electron microscope at an acceleration voltage of 2 kV satisfy predetermined number distribution, respectively.Type: ApplicationFiled: January 22, 2021Publication date: July 29, 2021Applicant: FUJIFILM CorporationInventors: Atsushi MUSHA, So MATSUYAMA, Norihito KASADA
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Publication number: 20200312362Abstract: The magnetic recording medium includes: a non-magnetic support; and a magnetic layer including ferromagnetic powder, in which the magnetic layer includes a compound having a salt structure, and the salt structure is an ammonium salt structure of an alkyl ester anion represented by the following Formula 1. In Formula 1, R represents an alkyl group having 7 or more carbon atoms or a fluorinated alkyl group having 7 or more carbon atoms, Z+ represents an ammonium cation, and a water contact angle on a surface of the magnetic layer is 80° or more and less than 100°. A magnetic recording and reproducing apparatus includes the magnetic recording medium.Type: ApplicationFiled: March 26, 2020Publication date: October 1, 2020Applicant: FUJIFILM CorporationInventors: Wataru KIKUCHI, So MATSUYAMA