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公开(公告)号：US11302353B2
公开(公告)日：2022-04-12
申请号：US17018750
申请日：2020-09-11
Applicant: Sony Corporation
Inventor： Minoru Yamaga , Noboru Sekiguchi
Abstract: In a magnetic recording medium, 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 650 ppm/N≤Δw, and a rate of shrinkage in the longitudinal direction is 0.08% or less.
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公开(公告)号：US10978104B2
公开(公告)日：2021-04-13
申请号：US16456209
申请日：2019-06-28
Applicant: Sony Corporation
Inventor： Minoru Yamaga , Noboru Sekiguchi
Abstract: A tape-type magnetic recording medium, includes a substrate; and a magnetic layer provided on the substrate. The magnetic recording medium is configured such that (1) (wmax−wmin)/wmin≤400 [ppm] where wmax and wmin are respectively maximum and minimum of average values of width of the magnetic recording medium measured under four environments whose temperature and relative humidity are (10° C., 10%), (10° C., 80%), (29° C., 80%), and (45° C., 10%), respectively, and the magnetic layer has a squareness ratio of 65% or more in the vertical direction, and (2) 4.4≤TB/(TA−TB) where TA is an average thickness of the magnetic recording medium and TB is an average thickness of the substrate.
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公开(公告)号：US11621020B2
公开(公告)日：2023-04-04
申请号：US16490279
申请日：2018-04-06
Applicant: SONY CORPORATION
Inventor： Junichi Tachibana , Takashi Aizawa , Teruo Sai , Noboru Sekiguchi , Tetsuo Endo , Tomoe Ozaki , Ryoichi Hiratsuka
Abstract: A magnetic recording medium includes a flexible and elongated substrate, a soft magnetic layer having an average thickness of 10 nm or more to 50 nm or less, and a recording layer. The soft magnetic layer is disposed between the substrate and the recording layer, and a difference in Young's modulus between the magnetic recording medium and the substrate in a longitudinal direction of the substrate is 2.4 GPa or more.
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公开(公告)号：US11508407B2
公开(公告)日：2022-11-22
申请号：US16474437
申请日：2018-11-26
Applicant: Sony Corporation
Inventor： Noboru Sekiguchi , Minoru Yamaga
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].
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公开(公告)号：US11423936B2
公开(公告)日：2022-08-23
申请号：US14273694
申请日：2014-05-09
Applicant: Sony Corporation
Inventor： Junichi Tachibana , Jota Ito , Tomoe Ozaki , Ryoichi Hiratsuka , Noboru Sekiguchi , Tetsuo Endo
Abstract: There is provided a magnetic recording medium including a base; a seed layer; a foundation layer; and a recording layer, the seed layer being disposed between the base and the foundation layer, having an amorphous state, including an alloy containing Ti, Cr and O, a percentage of Ti being 30 atomic % to 100 atomic % based on a total amount of Ti and Cr contained in the seed layer, and a percentage of O being 15 atomic % or less based on a total amount of Ti, Cr and O contained in the seed layer. Also, a production method thereof is provided.
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Patent Agency Ranking
公开(公告)号：US11056143B2
公开(公告)日：2021-07-06
申请号：US16703435
申请日：2019-12-04
Applicant: SONY CORPORATION
Inventor： Minoru Yamaga , Noboru Sekiguchi , Tooru Sato , Takashi Aizawa
Abstract: 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 μm, 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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公开(公告)号：US10964346B2
公开(公告)日：2021-03-30
申请号：US16864918
申请日：2020-05-01
Applicant: Sony Corporation
Inventor： Minoru Yamaga , Noboru Sekiguchi
Abstract: A magnetic recording medium, includes a substrate; a magnetic layer; an underlayer between the substrate and the magnetic layer, the underlayer including a non-magnetic powder and a binding agent; and a back layer. In a case where wmax and wmin are respectively maximum and minimum of average values of width of the magnetic recording medium measured under four environments whose temperature and relative humidity are (10° C., 10%), (10° C., 80%), (29° C., 80%), and (45° C., 10%), respectively, wmax and wmin satisfy a relation of (wmax−wmin)/wmin≤400 [ppm]. The substrate includes polyester. A squareness ratio in a vertical direction of the magnetic medium is 65% or more, and an average thickness of the magnetic recording medium is 5.6 μm or less.
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公开(公告)号：US10580447B2
公开(公告)日：2020-03-03
申请号：US15573374
申请日：2016-05-12
Applicant: Sony Corporation
Inventor： Noboru Sekiguchi , Tomoe Ozaki , Tetsuo Endo , Takashi Aizawa , Junichi Tachibana , Hikaru Terui , Teruo Sai
Abstract: A magnetic recording medium has a recording surface having an average surface roughness SRa of 3.0 nm or less, the number of projections having a height of 7.5 nm or more included in a unit region (where the unit region is a square region with each side having a length of 30 μm) of the recording surface is 256 or more, and the number of projections having a height of 15 nm or more included in the unit region of the recording surface is 0 or more and 104 or less.
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公开(公告)号：US11676631B2
公开(公告)日：2023-06-13
申请号：US16651542
申请日：2019-10-02
Applicant: Sony Corporation
Inventor： Noboru Sekiguchi , Minoru Yamaga
CPC classification number: G11B5/714 , G11B5/5928 , G11B5/70678 , G11B5/78
Abstract: A magnetic recording medium is a tape-shaped magnetic recording medium, including: a substrate; an underlayer provided on the substrate; and a magnetic layer provided on the underlayer. The substrate contains polyester, each of the underlayer and the magnetic layer contains a lubricant, the magnetic layer has a surface on which a large number of holes is provided, the arithmetic average roughness Ra of the surface is 2.5 nm or less, a BET specific surface area of the entire magnetic recording medium measured in a state where the magnetic recording medium has been washed and dried is 3.5 m2/g or more and 7.0 m2/g or less, a squareness ratio of the magnetic layer in a vertical direction is 65% or more, an average thickness of the magnetic layer is 80 nm or less, an average thickness of the magnetic recording medium is 5.6 μm or less, and a servo pattern is recorded on the magnetic layer and a statistical value δSW indicating a non-linearity of the servo pattern is 24 nm or less.
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公开(公告)号：US11468910B2
公开(公告)日：2022-10-11
申请号：US17275578
申请日：2019-08-29
Applicant: Sony Corporation
Inventor： Hiroto Atagi , Noboru Sekiguchi , Takashi Aizawa , Tomoe Ozaki , Koji Suzuki , Yoichi Kanemaki , Teruo Sai , Ryoichi Hiratsuka , Kazuya Hashimoto
Abstract: A tape-like magnetic recording medium includes a reinforced substrate, and a recording layer arranged on the reinforced substrate, and the reinforced substrate includes a substrate that has a first face and a second face opposed to each other, and has an average thickness of 4 μm or smaller, and a metal layer that contains cobalt, arranged on the first face, the reinforced substrate by itself causing thereon a depth of indentation of 0.25 μm or shallower, when a 0.7-mm-diameter hard sphere is impressed against the second face under 5.0 gf load for 10 seconds.
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