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公开(公告)号：US11830531B2
公开(公告)日：2023-11-28
申请号：US18085343
申请日：2022-12-20
发明人： Kazuya Hashimoto , Minoru Yamaga , Takanobu Iwama , Jun Takahashi
CPC分类号： G11B5/73931 , G11B5/17 , G11B5/78
摘要： 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. The substrate includes a polyester as a main component. The average thickness of the base layer is 0.9 μm or less. The base layer and the magnetic layer each include a lubricant. The magnetic layer has a surface having a large number of holes, and the arithmetic average roughness Ra of the surface is 2.5 nm or less. The BET specific surface area of the entire magnetic recording medium is 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. The squareness ratio in the perpendicular direction is 65% or more. The average thickness of the magnetic layer is 90 nm or less. The average thickness of the magnetic recording medium is 5.6 μm or less.
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公开(公告)号：US11688425B2
公开(公告)日：2023-06-27
申请号：US17046375
申请日：2020-06-17
发明人： Minoru Yamaga , Tooru Sato , Kanako Hashimoto
摘要： 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 μm, 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.-
公开(公告)号：US11521650B2
公开(公告)日：2022-12-06
申请号：US17328503
申请日：2021-05-24
发明人： Minoru Yamaga , Noboru Sekiguchi
摘要： A magnetic recording medium includes a layer structure including a magnetic layer, a base layer, and a back layer in this order, in which an average thickness tT is tT≤5.5 μm, a dimensional variation Δw in a width direction to tension change in a longitudinal direction is 660 ppm/N≤Δw, and a surface roughness Rabe of the base layer on a side of the back layer is 4.2 nm≤Rabe≤8.5 nm.
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公开(公告)号：US11626128B2
公开(公告)日：2023-04-11
申请号：US17253254
申请日：2019-10-31
发明人： Masaru Terakawa , Minoru Yamaga
摘要： 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.-
公开(公告)号：US11527260B2
公开(公告)日：2022-12-13
申请号：US16651811
申请日：2019-10-01
发明人： Minoru Yamaga , Takanobu Iwama , Jun Takahashi
摘要： 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 μm2. 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.
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公开(公告)号：US11854585B2
公开(公告)日：2023-12-26
申请号：US17790298
申请日：2021-01-19
发明人： Noboru Sekiguchi , Yuuko Kamoshita , Minoru Yamaga
CPC分类号： G11B5/71 , G11B5/5928 , G11B5/70678 , G11B5/78
摘要： A magnetic recording medium is a magnetic recording medium having a tape shape and includes a substrate, an underlayer provided on the substrate, and a magnetic layer provided on the underlayer. The magnetic layer has a surface having an uneven shape, a height range ΔH obtained from statistical information of a height of the uneven shape is in a range of 4.00 nm≤ΔH≤10.00 nm, and a gradient range ΔA obtained from statistical information of a gradient of the uneven shape is in a range of 2.50 degrees ≤ΔA.
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公开(公告)号：US11804243B2
公开(公告)日：2023-10-31
申请号：US16649403
申请日：2019-10-18
发明人： Minoru Yamaga , Noboru Sekiguchi
CPC分类号： G11B5/70678 , G11B5/5928 , G11B5/712 , G11B5/714 , G11B5/7356 , G11B5/78
摘要： 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 σSW 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 μm 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.-
公开(公告)号：US11749305B2
公开(公告)日：2023-09-05
申请号：US16649206
申请日：2019-10-18
发明人： Minoru Yamaga , Kazuya Hashimoto
摘要： To provide a magnetic recording medium that has excellent traveling stability in spite of having a thin total thickness and a thin thickness of an underlayer, and is suitable for use in a recording/reproducing device for adjusting the width of the magnetic recording medium by adjusting a tension of the magnetic recording medium in a longitudinal direction thereof.
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 underlayer has a thickness of 0.5 μm or more and 0.9 μm or less, the magnetic recording medium has an average thickness tT of 5.6 μm 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, and the Young's modulus in a longitudinal direction is 7.90 GPa or less.-
公开(公告)号：US11651781B2
公开(公告)日：2023-05-16
申请号：US17598728
申请日：2019-05-09
发明人： Minoru Yamaga
CPC分类号： G11B5/00817 , G11B5/584 , G11B5/78 , G11B20/1202 , G11B21/103 , G11B2220/93
摘要： A magnetic recording medium according to the present technology is a tape-shaped magnetic recording medium including: a base material; and a magnetic layer, the tape-shaped magnetic recording medium being long in a longitudinal direction and short in a width direction, in which the magnetic layer includes a data band long in the longitudinal direction and a servo band long in the longitudinal direction, a data signal being written to the data band, a servo signal being written to the servo band, the degree of perpendicular orientation of the magnetic layer being 65% or more, a full width at half maximum of an isolated waveform in a reproduced waveform of the data signal is 185 nm or less, a thickness of the magnetic layer is 90 nm or less, and a thickness of the base material is 4.2 μm or less.
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公开(公告)号：US11631430B2
公开(公告)日：2023-04-18
申请号：US17223741
申请日：2021-04-06
发明人： Minoru Yamaga , Noboru Sekiguchi , Tooru Sato , Takashi Aizawa
摘要： A magnetic recording medium is provided and includes a magnetic layer, a non-magnetic layer, a base layer and a back layer, wherein an average thickness tT of the magnetic recording medium is tT≤5.3 a dimensional change amount Δw in a width direction with respect to a change in tension in a longitudinal direction is 700 ppm/N≤Δw, a thickness of the non-magnetic layer is 2.0 μm or less, a squareness ratio measured in a vertical direction of the magnetic recording medium is 65% or more, and the magnetic layer includes a magnetic powder.
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