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公开(公告)号：US12106789B2
公开(公告)日：2024-10-01
申请号：US18298084
申请日：2023-04-10
申请人： FUJIFILM Corporation
发明人： Nagisa Yamasaki , Norihito Kasada , Yuto Murata
CPC分类号： G11B5/78 , G11B5/70 , G11B5/5928 , G11B5/84
摘要： The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, and a magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. The number of recesses existing on a surface of the magnetic layer and having an equivalent circle diameter of 0.15 μm or more and 0.25 μm or less is 100 or more and 2500 or less per an area of 40 μm×40 μm. Standard deviation σ of the number of the recesses in a width direction of the surface of the magnetic layer is 100 or less.
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公开(公告)号：US12087339B2
公开(公告)日：2024-09-10
申请号：US18226026
申请日：2023-07-25
CPC分类号： G11B5/7375 , G11B5/7369 , G11B2005/0021
摘要： Various apparatuses, systems, methods, and media are disclosed for heat-assisted magnetic recording (HAMR) that, in some examples, provide a HAMR medium with two soft underlayers (SULs) on opposing sides of a single heatsink layer. For example, a magnetic recording medium is provided that includes a lower SUL on a substrate. The lower SUL is configured and positioned within the medium to provide a first return path for magnetic flux from a magnetic recording head during a write operation. The medium also includes a heatsink layer on the lower SUL and an upper SUL on the heatsink layer. The upper SUL is configured and positioned within the medium to provide a second return path for magnetic flux from the magnetic recording head. A magnetic recording layer is provided on the upper SUL to store information during the write operation. Additional layers or films may be provided as well.
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3.发明授权公开(公告)号：US12087337B2
公开(公告)日：2024-09-10
申请号：US17872651
申请日：2022-07-25
申请人： FUJIFILM Corporation
发明人： Norihito Kasada
CPC分类号： G11B5/584 , G11B5/73927 , G11B5/78 , G11B5/127 , G11B5/739
摘要： A magnetic tape device. The angle θ formed by the axis of the element array of the magnetic head with respect to a width direction of the magnetic tape is changed during running of the magnetic tape in the magnetic tape device. In a case where a maximum value of an absolute value of a difference between a servo band spacing obtained before storage in a predetermined environment and a servo band spacing obtained after storage in the environment for a storage time T is defined as A, and T is set to a plurality of predetermined times, a medium life calculated by a linear function of A and a logarithm loge T of T, that are derived from a value of A and a value of the logarithm loge T of T obtained for each T is 5 years or longer.
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公开(公告)号：US12080322B2
公开(公告)日：2024-09-03
申请号：US18191354
申请日：2023-03-28
申请人： FUJIFILM Corporation
发明人： Tetsuya Kaneko
IPC分类号： G11B23/107 , G11B5/588 , G11B5/78
CPC分类号： G11B23/107 , G11B5/588 , G11B5/78
摘要： A magnetic tape including a timing-based servo pattern, in which the magnetic tape is used in a magnetic tape device in which a total number of data tracks is 8705 or more in conversion of a magnetic tape having a width of ½ inches, and ΔPNL of the timing-based servo pattern is 10.0% or less of a track pitch. A magnetic tape cartridge including the magnetic tape, and a magnetic tape device including a magnetic tape, in which a total number of data tracks is 8705 or more in conversion of a magnetic tape having a width of ½ inches, the magnetic tape includes a timing-based servo pattern, and ΔPNL of the timing-based servo pattern is 10.0% or less of a track pitch are provided. The ΔPNL indicates an amount of deviation of the timing-based servo pattern from linearity.
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公开(公告)号：US20240282336A1
公开(公告)日：2024-08-22
申请号：US18649412
申请日：2024-04-29
申请人： FUJIFILM Corporaton
发明人： Norihito KASADA , Yusuke Kaneko
IPC分类号： G11B5/592 , G11B5/706 , G11B5/735 , G11B5/78 , G11B23/107
CPC分类号： G11B5/5928 , G11B5/70678 , G11B5/7356 , G11B5/78 , G11B23/107
摘要： In the magnetic tape, in a case where a maximum value of an absolute value of a difference between a servo band spacing obtained before storage in an environment of a temperature of 32° C. and relative humidity of 55% and a servo band spacing obtained after storage in the environment for a storage time T is set to A, and T is defined as 24 hours, 48 hours, 72 hours, 96 hours, or 120 hours, a medium life calculated by a linear function of A and a logarithm loge T of T, that are derived from a value of A and a value of the logarithm loge T of T obtained for each T is 3 years or longer. The medium life is T in a case where the A satisfies Equation 1: A=1.5−B.
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公开(公告)号：US20240161778A1
公开(公告)日：2024-05-16
申请号：US18284405
申请日：2022-03-31
发明人： Minoru YAMAGA , Takahiro TAKAYAMA
CPC分类号： G11B5/78 , G11B5/00817
摘要： Provided is a magnetic recording medium with a tape shape capable of correcting a change in width of the magnetic recording medium by adjusting a running tension of the magnetic recording medium in a case where the magnetic recording medium is saved or caused to run in a high-temperature environment. The magnetic recording medium is a magnetic recording medium with a tape shape, an amount of change in average width of the magnetic recording medium before and after the magnetic recording medium is left still for 40 hours in an environment at a temperature of 50° C. and a relative humidity of 40% RH in a state where a tension of 0.55 N is applied in a longitudinal direction is 170 ppm or less, and an average tension responsiveness with respect to a tension in the longitudinal direction in the environment at a temperature of 50° C. and a relative humidity of 40% RH is 700 ppm/N or more.
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公开(公告)号：US20240161775A1
公开(公告)日：2024-05-16
申请号：US18281842
申请日：2022-02-16
发明人： Hiroshi MORITA , Kazuo ANNO
摘要： A servo pattern recording method according to an embodiment of the present technology is a method of recording a servo pattern in a plurality of servo bands arrayed at intervals in a width direction of a magnetic layer of a magnetic tape, including: causing the magnetic tape to travel with a predetermined tension; and recording a servo pattern in the plurality of servo bands at a second pitch narrower than a first pitch that is an arrangement interval of two servo read heads in a tape drive device that records data in the magnetic layer or reproduces data recorded in the magnetic layer.
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公开(公告)号：US11977942B2
公开(公告)日：2024-05-07
申请号：US18155742
申请日：2023-01-18
申请人： FUJIFILM CORPORATION
发明人： Eiichiro Kataoka
IPC分类号： G06K19/077 , G11B5/78
CPC分类号： G06K19/07773 , G11B5/78
摘要： A noncontact storage medium that is mounted in a magnetic tape cartridge includes an IC chip that is connected to an antenna to be coupled to a communication destination by electromagnetic induction through a magnetic field applied from a communication destination, and performs communication with the communication destination through the magnetic field, and the IC chip corresponds to a plurality of communication standards.
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公开(公告)号：US20240105223A1
公开(公告)日：2024-03-28
申请号：US18467336
申请日：2023-09-14
申请人： FUJIFILM Corporation
发明人： Norihito KASADA , Yujin SHIBATA , Takuto KUROKAWA , So MATSUYAMA
CPC分类号： G11B5/584 , G11B5/7021 , G11B5/70678 , G11B5/714 , G11B5/78 , G11B15/43
摘要： The magnetic tape includes: a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which a contact angle with 1-bromonaphthalene, which is measured on a surface of the magnetic layer, is 45.0° or more and 55.0° or less, and standard deviation σ of the contact angle in a width direction of the surface of the magnetic layer is 1.0° or less.
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公开(公告)号：US11915730B1
公开(公告)日：2024-02-27
申请号：US18333851
申请日：2023-06-13
CPC分类号： G11B5/3146 , G11B5/78
摘要： A computer program product, device, system, and method are provided for decommissioning a tape cartridge internally within a tape library. In one embodiment automated tape cartridge decommissioning operations internal within a tape library, include receiving selection of a tape cartridge for decommissioning in a tape library and, using a tape library robotic accessor, moving a selected tape cartridge to a decommission workstation within the tape library. The selected tape cartridge is mounted to the decommission workstation and a fusing element of the decommission workstation is activated to fuse together layers of magnetic tape of the selected tape cartridge mounted to the decommission workstation, so that the selected tape cartridge is decommissioned within the tape library to have a decommissioned status.
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