-
公开(公告)号：US11651782B2
公开(公告)日：2023-05-16
申请号：US17168639
申请日：2021-02-05
Inventor： Hiroshi Isokawa
CPC classification number: G11B5/3116 , G11B5/012 , G11B5/23 , G11B5/4813 , G11B25/043 , G11B5/3912 , G11B5/3983 , G11B2005/0018 , G11B2005/0024
Abstract: According to one embodiment, among a plurality of magnetic heads, the larger the magnetic pole width of the magnetic pole of the magnetic head in the width direction of a recording track formed in a recording layer or the larger an area width of the magnetic head capable of reading the magnetic characteristics of an area of the recording layer on which magnetic recording has been carried out by means of the magnetic head, the farther is the magnetic head arranged outwardly from the vicinity of the center in the parallel arrangement direction of the magnetic disks.
-
公开(公告)号：US11354042B2
公开(公告)日：2022-06-07
申请号：US17179724
申请日：2021-02-19
Inventor： Hiroshi Isokawa
IPC: G06F3/06
Abstract: According to one embodiment, a magnetic disk device includes a disk, a head including a read head that reads data from the disk, a write head that writes data into the disk, and an assist element that generates energy for improving write performance of the write head, and a controller that adjusts a degauss condition after a stop of a write process of the write head, based on a resistance value of the assist element, and adjusts a data format of the disk in accordance with the degauss condition, the resistance value being measured after data is written into the disk, and the write process having an influence on the resistance value.
-
公开(公告)号：US20200234732A1
公开(公告)日：2020-07-23
申请号：US16839549
申请日：2020-04-03
Inventor： Daisuke Sudo , Hiroshi Isokawa
Abstract: According to one embodiment, there is provided a disk device including a head, a disk, a first motor, and a first circuit. The disk has a recording surface. The first motor causes the head to seek along the recording surface. The first circuit can switch between a first state and a second state. The first state is a state where a current path of the first motor is electrically cut off from a first electricity storage unit. The second state is a state where the current path of the first motor is electrically connected to the first electricity storage unit.
-
公开(公告)号：US12002495B2
公开(公告)日：2024-06-04
申请号：US18119730
申请日：2023-03-09
Inventor： Hiroshi Isokawa , Takuya Matsumoto
CPC classification number: G11B5/012 , G11B2005/001 , G11B2005/0021 , G11B2209/02
Abstract: According to one embodiment, a magnetic disk device includes magnetic disks, a plurality of magnetic heads, and a control unit. A plurality of magnetic heads each includes a heat-assist unit which applies a preheating current of such magnitude that data already written to the magnetic disk is not erased to a near-field optical element for the preheat time. The control unit measures the time elapsing from a start of write to the time when a value of an index indicating the quality of a recording signal of data written by the magnetic head converges to within a first threshold range, and adjusts the preheat time for each of the magnetic heads in such a manner that the measured lapse time becomes less than or equal to a second threshold.
-
公开(公告)号：US20190206437A1
公开(公告)日：2019-07-04
申请号：US16114560
申请日：2018-08-28
Inventor： Daisuke Sudo , Hiroshi Isokawa
CPC classification number: G11B19/2063 , G11B19/06
Abstract: According to one embodiment, there is provided a disk device including a head, a disk, a first motor, and a first circuit. The disk has a recording surface. The first motor causes the head to seek along the recording surface. The first circuit can switch between a first state and a second state. The first state is a state where a current path of the first motor is electrically cut off from a first electricity storage unit. The second state is a state where the current path of the first motor is electrically connected to the first electricity storage unit.
-
Patent Agency Ranking
公开(公告)号：US20150221332A1
公开(公告)日：2015-08-06
申请号：US14336610
申请日：2014-07-21
Applicant: Kabushiki Kaisha Toshiba
Inventor： Hiroshi Isokawa
IPC: G11B7/1263
CPC classification number: G11B11/10595 , G11B5/02 , G11B11/10506 , G11B11/1053 , G11B2005/0021
Abstract: According to one embodiment, there is provided a magnetic disk device including a light source, a light irradiation element, and a controller. The light irradiation element is configured to receive light from the light source to irradiate light onto a magnetic disk. The controller is configured to switch between a first control and a second control according to a pulse width of data to be written onto the magnetic disk. The first control keeps an output of the light source at a first value. The second control makes the output of the light source change periodically between the first value and a second value lower than the first value.
Abstract translation: 根据一个实施例，提供一种包括光源，光照射元件和控制器的磁盘装置。 光照射元件被配置为从光源接收光以将光照射到磁盘上。 控制器被配置为根据要写入磁盘的数据的脉冲宽度在第一控制和第二控制之间切换。 第一控制将光源的输出保持在第一值。 第二控制使得光源的输出在第一值和低于第一值的第二值之间周期性地改变。
-
7.发明授权公开(公告)号：US08995079B2
公开(公告)日：2015-03-31
申请号：US14023956
申请日：2013-09-11
Applicant: Kabushiki Kaisha Toshiba
Inventor： Hiroshi Isokawa , Tomoko Taguchi
CPC classification number: G11B5/6088 , G11B5/314 , G11B5/4866 , G11B13/04 , G11B2005/0021
Abstract: According to one embodiment, there is provided a magnetic head including a wave guide, a near field transducer, a writing magnetic pole, a magnetic core, a writing coil, and a first temperature control element. The near field transducer is disposed on an ABS surface and to which light is guided from the wave guide. The writing magnetic pole is disposed on the ABS surface. The magnetic core is connected to the writing magnetic pole so as to generate a magnetic field from a portion of the writing magnetic pole close to the ABS surface. The writing coil is disposed so as to go around the magnetic core. The first temperature control element is disposed in contact with a region of a first side surface of the wave guide near the near field transducer.
Abstract translation: 根据一个实施例，提供了一种包括波导，近场换能器，书写磁极，磁芯，写入线圈和第一温度控制元件的磁头。 近场换能器设置在ABS表面上，并且从波导引导光。 写磁极设置在ABS表面上。 磁芯与写入磁极连接，以便从靠近ABS表面的书写磁极的一部分产生磁场。 写入线圈被设置成绕着磁芯。 第一温度控制元件设置成与近场换能器附近的波导的第一侧表面的区域接触。
-
公开(公告)号：US11646051B2
公开(公告)日：2023-05-09
申请号：US17591957
申请日：2022-02-03
Inventor： Hiroshi Isokawa , Nobuhiro Maeto
CPC classification number: G11B5/012 , G11B2005/0021
Abstract: According to one embodiment, a magnetic disk device includes a disk that includes a first track, a head that includes a heater, writes data to the disk, and reads data from the disk, and a controller configured to set a variation of a parameter related to a write process for the disk within one round of the first track to suppress a variation of an evaluation index corresponding to a write/read processing characteristic within one round of the first track.
-
公开(公告)号：US20220115039A1
公开(公告)日：2022-04-14
申请号：US17378001
申请日：2021-07-16
Inventor： Takuya Matsumoto , Hiroshi Isokawa
IPC: G11B13/08
Abstract: According to one embodiment, a magnetic recording and reproducing device includes a perpendicular magnetic recording medium, a perpendicular magnetic recording head, a thermal assisted magnetic recording medium, and a thermal assisted magnetic recording head.
-
公开(公告)号：US20220066649A1
公开(公告)日：2022-03-03
申请号：US17179724
申请日：2021-02-19
Inventor： Hiroshi Isokawa
IPC: G06F3/06
Abstract: According to one embodiment, a magnetic disk device includes a disk, a head including a read head that reads data from the disk, a write head that writes data into the disk, and an assist element that generates energy for improving write performance of the write head, and a controller that adjusts a degauss condition after a stop of a write process of the write head, based on a resistance value of the assist element, and adjusts a data format of the disk in accordance with the degauss condition, the resistance value being measured after data is written into the disk, and the write process having an influence on the resistance value.
-
-
-
-
-
-
-
-
-
Search Results
25
records
(took 0.017 seconds)
