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公开(公告)号:US20250014601A1
公开(公告)日:2025-01-09
申请号:US18758977
申请日:2024-06-28
Applicant: FUJIFILM Corporation
Inventor: Junya Sawada , Norihito Kasada , Nobuhito Onozuka , Ryosuke Yumiyama
Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. Svi obtained by measuring a surface of the magnetic layer with an atomic force microscope and by Equation A is 0.080 or more and 0.130 or less, and standard deviation σ of the Svi in a width direction of the surface of the magnetic layer is 0.010 or less. In Equation A, Sq is a root-mean-square height Sq specified in ISO 25178, Vv(h0.8) is a void volume in a region where a load area ratio in a bearing curve is 80% or more and 100% or less, and A is a measurement region area. Svi = ( Vv ( h 0.8 ) A ) / Sq Equation A
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公开(公告)号:US20250014600A1
公开(公告)日:2025-01-09
申请号:US18758961
申请日:2024-06-28
Applicant: FUJIFILM Corporation
Inventor: Nobuhito Onozuka , Norihito Kasada , Ryosuke Yumiyama , Junya Sawada
Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. VIVA 0.1, which is a height that is obtained by measuring a surface of the magnetic layer with an atomic force microscope and at which a cross-sectional area is 0.1% with a measurement region area as 100%, is 5 nm or more and 10 nm or less, and standard deviation σ of the VIVA 0.1 in a width direction of the surface of the magnetic layer is 1.0 nm or less.
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公开(公告)号:US20250014602A1
公开(公告)日:2025-01-09
申请号:US18759188
申请日:2024-06-28
Applicant: FUJIFILM Corporation
Inventor: Nobuhito Onozuka , Norihito Kasada , Ryosuke Yumiyama , Junya Sawada
Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. CS VIVA 0.1, which is a height that is obtained by measuring a surface of the magnetic layer with an atomic force microscope and at which a cutout length is 0.1% with a length of one side of a measurement region as 100%, is 4 nm or more and 10 nm or less, and standard deviation a of the CS VIVA 0.1 in a width direction of the surface of the magnetic layer is 1.0 nm or less.
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公开(公告)号:US20250014599A1
公开(公告)日:2025-01-09
申请号:US18758432
申请日:2024-06-28
Applicant: FUJIFILM Corporation
Inventor: Norihito Kasada , Nobuhito Onozuka , Junya Sawada , Ryosuke Yumiyama
Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. A core void volume Vvc specified in international organization for standardization (ISO) 25178 on a surface of the magnetic layer is 1.200 nm3 or more and 3.000 nm3 or less, and standard deviation a of the Vvc in a width direction of the surface of the magnetic layer is 0.120 nm3 or less.
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公开(公告)号:US20250014598A1
公开(公告)日:2025-01-09
申请号:US18759114
申请日:2024-06-28
Applicant: FUJIFILM Corporation
Inventor: Ryosuke YUMIYAMA , Norihito Kasada , Nobuhito Onozuka , Junya Sawada
Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. A protruding peak height Spk specified in ISO 25178 on a surface of the magnetic layer is 1.5 nm or more and 3.0 nm or less, and standard deviation σ of the Spk in a width direction of the surface of the magnetic layer is 0.5 nm or less.
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