Patents by Inventor Noboru Sekiguchi
Noboru Sekiguchi 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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Patent number: 11862212Abstract: [Solving Means] A magnetic recording medium according to an embodiment of the present technology is a tape-shaped magnetic recording medium, including: a magnetic layer including a servo band, a servo signal being recorded on the servo band. An index expressed by Sq×Fact.(p?p)/F0(p?p) is 0.42 or more, Sq being a squareness ratio of the magnetic layer in a perpendicular direction, F0(p?p) being a peak-to-peak value of a first magnetic force gradient strength observed by a magnetic force microscope when a servo signal is saturation-recorded on the magnetic layer, Fact.(p?p) being a peak-to-peak value of a second magnetic force gradient strength for the servo signal recorded on the servo band observed by the magnetic force microscope.Type: GrantFiled: March 27, 2020Date of Patent: January 2, 2024Assignee: Sony Group CorporationInventors: Junichi Tachibana, Noboru Sekiguchi
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Patent number: 11854585Abstract: 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 ?H obtained from statistical information of a height of the uneven shape is in a range of 4.00 nm??H?10.00 nm, and a gradient range ?A obtained from statistical information of a gradient of the uneven shape is in a range of 2.50 degrees ??A.Type: GrantFiled: January 19, 2021Date of Patent: December 26, 2023Assignee: Sony Group CorporationInventors: Noboru Sekiguchi, Yuuko Kamoshita, Minoru Yamaga
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Publication number: 20230368814Abstract: 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 ?H obtained from statistical information of a height of the uneven shape is in a range of 4.00 nm??H?10.00 nm, and a gradient range ?A obtained from statistical information of a gradient of the uneven shape is in a range of 2.50 degrees??A.Type: ApplicationFiled: June 28, 2023Publication date: November 16, 2023Inventors: Noboru SEKIGUCHI, Yuuko KAMOSHITA, Minoru YAMAGA
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Patent number: 11804243Abstract: 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: GrantFiled: October 18, 2019Date of Patent: October 31, 2023Assignee: Sony Group CorporationInventors: Minoru Yamaga, Noboru Sekiguchi
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Publication number: 20230343365Abstract: 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 ?sw indicating a non-linearity of the servo pattern is 24 nm or less.Type: ApplicationFiled: May 23, 2023Publication date: October 26, 2023Inventors: Noboru SEKIGUCHI, Minoru YAMAGA
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Patent number: 11676631Abstract: 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 ?m or less, and a servo pattern is recorded on the magnetic layer and a statistical value ?SW indicating a non-linearity of the servo pattern is 24 nm or less.Type: GrantFiled: October 2, 2019Date of Patent: June 13, 2023Assignee: Sony Group CorporationInventors: Noboru Sekiguchi, Minoru Yamaga
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Patent number: 11631430Abstract: 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 ?w in a width direction with respect to a change in tension in a longitudinal direction is 700 ppm/N??w, a thickness of the non-magnetic layer is 2.0 ?m 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.Type: GrantFiled: April 6, 2021Date of Patent: April 18, 2023Assignee: Sony Group CorporationInventors: Minoru Yamaga, Noboru Sekiguchi, Tooru Sato, Takashi Aizawa
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Patent number: 11621020Abstract: 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.Type: GrantFiled: April 6, 2018Date of Patent: April 4, 2023Assignee: SONY CORPORATIONInventors: Junichi Tachibana, Takashi Aizawa, Teruo Sai, Noboru Sekiguchi, Tetsuo Endo, Tomoe Ozaki, Ryoichi Hiratsuka
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Publication number: 20230042175Abstract: 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 ?H obtained from statistical information of a height of the uneven shape is in a range of 4.00 nm ? ?H ? 10.00 nm, and a gradient range ?A obtained from statistical information of a gradient of the uneven shape is in a range of 2.50 degrees ? ?A.Type: ApplicationFiled: January 19, 2021Publication date: February 9, 2023Inventors: Noboru SEKIGUCHI, Yuuko KAMOSHITA, Minoru YAMAGA
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Patent number: 11521650Abstract: 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 ?m, a dimensional variation ?w in a width direction to tension change in a longitudinal direction is 660 ppm/N??w, and a surface roughness Rabe of the base layer on a side of the back layer is 4.2 nm?Rabe?8.5 nm.Type: GrantFiled: May 24, 2021Date of Patent: December 6, 2022Assignee: Sony CorporationInventors: Minoru Yamaga, Noboru Sekiguchi
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Patent number: 11508407Abstract: 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: GrantFiled: November 26, 2018Date of Patent: November 22, 2022Assignee: Sony CorporationInventors: Noboru Sekiguchi, Minoru Yamaga
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Patent number: 11468910Abstract: 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 ?m 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 ?m or shallower, when a 0.7-mm-diameter hard sphere is impressed against the second face under 5.0 gf load for 10 seconds.Type: GrantFiled: August 29, 2019Date of Patent: October 11, 2022Assignee: Sony CorporationInventors: Hiroto Atagi, Noboru Sekiguchi, Takashi Aizawa, Tomoe Ozaki, Koji Suzuki, Yoichi Kanemaki, Teruo Sai, Ryoichi Hiratsuka, Kazuya Hashimoto
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Publication number: 20220284923Abstract: 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: ApplicationFiled: October 18, 2019Publication date: September 8, 2022Inventors: Minoru YAMAGA, Noboru SEKIGUCHI
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Patent number: 11423936Abstract: 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.Type: GrantFiled: May 9, 2014Date of Patent: August 23, 2022Assignee: Sony CorporationInventors: Junichi Tachibana, Jota Ito, Tomoe Ozaki, Ryoichi Hiratsuka, Noboru Sekiguchi, Tetsuo Endo
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Publication number: 20220189506Abstract: [Solving Means] A magnetic recording medium according to an embodiment of the present technology is a tape-shaped magnetic recording medium, including: a magnetic layer including a servo band, a servo signal being recorded on the servo band. An index expressed by Sq×Fact.(p?p)/F0(p?p) is 0.42 or more, Sq being a squareness ratio of the magnetic layer in a perpendicular direction, F0(p?p) being a peak-to-peak value of a first magnetic force gradient strength observed by a magnetic force microscope when a servo signal is saturation-recorded on the magnetic layer, Fact.(p?p) being a peak-to-peak value of a second magnetic force gradient strength for the servo signal recorded on the servo band observed by the magnetic force microscope.Type: ApplicationFiled: March 27, 2020Publication date: June 16, 2022Inventors: Junichi TACHIBANA, Noboru SEKIGUCHI
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Publication number: 20220172742Abstract: 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 ?m or less, and a servo pattern is recorded on the magnetic layer and a statistical value ?SW indicating a non-linearity of the servo pattern is 24 nm or less.Type: ApplicationFiled: October 2, 2019Publication date: June 2, 2022Inventors: Noboru SEKIGUCHI, Minoru YAMAGA
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Patent number: 11302355Abstract: A magnetic recording medium is provided and includes a substrate; and a magnetic layer provided over the substrate, wherein (wmax?wmin)/wmin?400 [ppm] . . . (1) where wmax and wmin are respectively maximum and minimum of average values of width corresponding to samples of magnetic recording medium measured after the samples are stored for two hours under storage conditions (a loading tension in the longitudinal direction of the magnetic recording medium, a temperature and a relative humidity) for each of the samples, and a width of a sample of the magnetic recording medium at 25° C. and 50% relative humidity and without loading is ½ inch, magnetic recording medium has Young's modulus of less than 8.0 GPa in a longitudinal direction, and 4.0?TB/(TA?TB) . . . (2) where TA is average thickness of magnetic recording medium and TB is average thickness of substrate.Type: GrantFiled: January 22, 2021Date of Patent: April 12, 2022Assignee: Sony CorporationInventors: Minoru Yamaga, Noboru Sekiguchi
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Patent number: 11302353Abstract: In a magnetic recording medium, an average thickness tT is tT?5.5 ?m, a dimensional variation ?w in a width direction to tension change in a longitudinal direction is 650 ppm/N??w, and a rate of shrinkage in the longitudinal direction is 0.08% or less.Type: GrantFiled: September 11, 2020Date of Patent: April 12, 2022Assignee: Sony CorporationInventors: Minoru Yamaga, Noboru Sekiguchi
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Patent number: 11302354Abstract: The average thickness tT of a magnetic recording medium meets the requirement that tT?5.5 [?m], and the dimensional change amount ?w in the width direction of the magnetic recording medium with respect to the tension change in the longitudinal direction of the magnetic recording medium meets the requirement that 700 ppm/N??w.Type: GrantFiled: September 25, 2020Date of Patent: April 12, 2022Assignee: Sony CorporationInventors: Noboru Sekiguchi, Minoru Yamaga
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Publication number: 20220108723Abstract: 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 ?m 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 ?m or shallower, when a 0.7-mm-diameter hard sphere is impressed against the second face under 5.0 gf load for 10 seconds.Type: ApplicationFiled: August 29, 2019Publication date: April 7, 2022Inventors: Hiroto ATAGI, Noboru SEKIGUCHI, Takashi AIZAWA, Tomoe OZAKI, Koji SUZUKI, Yoichi KANEMAKI, Teruo SAI, Ryoichi HIRATSUKA, Kazuya HASHIMOTO