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公开(公告)号：US20240203455A1
公开(公告)日：2024-06-20
申请号：US18286273
申请日：2022-02-15
发明人： Takahiro TAKAYAMA , Minoru YAMAGA
IPC分类号： G11B15/43 , G11B5/73 , G11B5/78 , G11B23/027
CPC分类号： G11B15/43 , G11B5/73 , G11B5/78 , G11B23/027
摘要： An object of the present invention is to provide a magnetic recording cartridge capable of correcting a width of a magnetic recording medium in a longitudinal direction thereof by adjusting running tension of a tape system or changing a winding direction even when stored in a high-temperature environment.
A magnetic recording cartridge including: a magnetic recording medium having a base layer; and a reel, in which a loss modulus at 65° C. of the base layer is 0.40 GPa or less, the magnetic recording medium is wound around the reel, and when a variation in width is measured over an entire length of the magnetic recording medium after storage at 65° C. for 360 hours, a sign of variation in width Δout on an outer side of winding is different from a sign of variation in width Δin on an inner side of winding, and the variation in width is 0 ppm at any position of two portions sandwiching a center line of the entire length of the magnetic recording medium in a case where the entire length of the magnetic recording medium is divided into four portions by dividing into four equal parts.-
公开(公告)号：US20240170015A1
公开(公告)日：2024-05-23
申请号：US18284685
申请日：2022-03-31
发明人： Noboru SEKIGUCHI , Minoru YAMAGA
IPC分类号： G11B5/78 , G11B5/706 , G11B5/73 , G11B23/087 , G11B23/107
CPC分类号： G11B5/78 , G11B5/70615 , G11B5/70678 , G11B5/73911 , G11B23/087 , G11B23/107
摘要： Provided is a magnetic recording medium capable of curbing deterioration in electromagnetic conversion characteristics.
A magnetic recording medium with a tape shape includes a substrate that contains polyesters, an underlayer that is provided on the substrate, and a magnetic layer that is provided on the underlayer and contains a magnetic powder. The magnetic recording medium contains a lubricant. An average value of arithmetic average roughnesses Ra of a surface of the magnetic layer is 1.3 nm or less. In a case where an average value of peak half widths of a spacing increase region generated on an entrance side of a glass pseudo head which the magnetic recording medium enters when the magnetic recording medium is slid over the glass pseudo head is set as a spacing index SRL and an average value of peak half widths of a spacing increase region generated in the vicinity of an edge of the magnetic recording medium in a width direction when the magnetic recording medium is slid over the glass pseudo head is set as a spacing index SRT, the spacing index SRL is 35 μm or less and the spacing index SRT is 68 μm or less.-
公开(公告)号：US20220254374A1
公开(公告)日：2022-08-11
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：US20220148618A1
公开(公告)日：2022-05-12
申请号：US17598728
申请日：2019-05-09
发明人： Minoru YAMAGA
摘要： [Object] To provide a technology capable of further improving the recording density of data.
[Solving Means] 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.-
公开(公告)号：US20210241797A1
公开(公告)日：2021-08-05
申请号：US17234187
申请日：2021-04-19
发明人： Minoru YAMAGA , Noboru SEKIGUCHI
摘要： A magnetic recording cartridge is provided and including a magnetic recording medium, wherein an average thickness of the magnetic recording medium tT is 3.5 μm≤tT≤5.6 μm, a dimensional change amount Δw in a width direction of the magnetic recording medium with respect to a tension change in a longitudinal direction of the magnetic recording medium is 700 ppm/N≤Δw≤20000 ppm, the magnetic recording medium is accommodated in a state of being wound around the reel in the cartridge case and (a servo track width on an inner side of winding of the magnetic recording medium)−(a servo track width on an outer side of winding of the magnetic recording medium)>0 is satisfied, and a squareness ratio measured in a vertical direction of the magnetic recording medium is 65% or more.
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公开(公告)号：US20240153535A1
公开(公告)日：2024-05-09
申请号：US18281144
申请日：2022-02-28
发明人： Minoru YAMAGA
CPC分类号： G11B20/1202 , G11B5/00817
摘要： A servo pattern recording method includes: determining a first servo band group that includes three or more servo bands for recording a servo pattern in which first servo band identification information having a plurality of bits is to be embedded, and a second servo band group that includes three or more servo bands for recording a servo pattern in which second servo band identification information having a plurality of bits is to be embedded, the second servo band identification information being different from the first servo band identification information; and recording the first and second servo band identification information on the first and second servo band groups, respectively, such that a combination of a first pair and a second pair is not duplicated, the first pair being a pair of servo band identification information and a phase in one servo band read by a first servo read head, the second pair being a pair of servo band identification information and a phase in the other servo band read by a second servo read head.
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7.发明公开公开(公告)号：US20230402063A1
公开(公告)日：2023-12-14
申请号：US18035334
申请日：2021-10-27
发明人： Minoru YAMAGA , Takahiro TAKAYAMA
CPC分类号： G11B21/10 , G11B5/73 , G11B5/5926
摘要： There is provided a magnetic recording medium of which a dimensional change due to a change in a temperature/humidity environment is small. The magnetic recording medium is a magnetic recording medium having a tape-like shape and having an average thickness of 5.3 μm or less. The magnetic recording medium includes a substrate and a magnetic layer provided on the substrate. An environmental relative humidity, in which a temperature expansion coefficient of the magnetic recording medium is 6.0 ppm/° C. or more and 8.0 ppm/° C. or less, ranges between 10% RH and 80% RH.
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公开(公告)号：US20230368814A1
公开(公告)日：2023-11-16
申请号：US18215392
申请日：2023-06-28
发明人： Noboru SEKIGUCHI , Yuuko KAMOSHITA , Minoru YAMAGA
CPC分类号： G11B5/71 , G11B5/5928 , G11B5/78 , G11B5/70678
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：US20230120213A1
公开(公告)日：2023-04-20
申请号：US18085343
申请日：2022-12-20
发明人： Kazuya HASHIMOTO , 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, 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：US20220328066A1
公开(公告)日：2022-10-13
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.
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