公开(公告)号：US07636212B2

公开(公告)日：2009-12-22

申请号：US11303851

申请日：2005-12-15

申请人： Akira Morinaga ,  Hideki Zaitsu ,  Hiroshi Ide ,  Hideo Tanabe

发明人： Akira Morinaga ,  Hideki Zaitsu ,  Hiroshi Ide ,  Hideo Tanabe

IPC分类号： G11B5/02 ,  G11B5/03

CPC分类号： G11B19/04 ,  G11B5/02 ,  G11B33/1406 ,  G11B2005/0018

摘要： An output of a magnetic head changes depending on the environmental temperature of a magnetic disk. In particular, under cold temperature conditions, an output of the head largely decreases mainly due to an increase in coercivity of a magnetic recording medium, which degrades an error rate. In one embodiment of the invention, sense-current optimization processing of a magnetic disk drive comprises the steps of: measuring the environmental temperature; and after a sense-current value which is set from the viewpoint of the reliability of the magnetic head is defined as an upper limit, finding out a sense current Is that can achieve the best error rate (BER) at the temperature. While changing a value of the sense current Is inside the magnetic disk drive, an error rate is measured. Then, a sense current Is_opt at which the best error rate properties are achieved is selected as a new set value.

摘要翻译： 磁头的输出根据磁盘的环境温度而变化。 特别是在低温条件下，由于磁记录介质的矫顽力的增加，磁头的输出主要下降，这降低了误差率。 在本发明的一个实施例中，磁盘驱动器的感测电流优化处理包括以下步骤：测量环境温度; 在从磁头的可靠性的观点来设定的感测电流值被定义为上限之后，找出能够在该温度下达到最佳误码率（BER）的感测电流Is。 在更改磁盘驱动器内的感应电流Is的值时，会测量错误率。 然后，选择实现最佳误码率属性的感测电流Is_opt作为新的设定值。

公开(公告)号：US20060132963A1

公开(公告)日：2006-06-22

申请号：US11303851

申请日：2005-12-15

申请人： Akira Morinaga ,  Hideki Zaitsu ,  Hiroshi Ide ,  Hideo Tanabe

发明人： Akira Morinaga ,  Hideki Zaitsu ,  Hiroshi Ide ,  Hideo Tanabe

IPC分类号： G11B21/02 ,  G11B19/02

CPC分类号： G11B19/04 ,  G11B5/02 ,  G11B33/1406 ,  G11B2005/0018

摘要： An output of a magnetic head changes depending on the environmental temperature of a magnetic disk. In particular, under cold temperature conditions, an output of the head largely decreases mainly due to an increase in coercivity of a magnetic recording medium, which degrades an error rate. In one embodiment of the invention, sense-current optimization processing of a magnetic disk drive comprises the steps of: measuring the environmental temperature; and after a sense-current value which is set from the viewpoint of the reliability of the magnetic head is defined as an upper limit, finding out a sense current Is that can achieve the best error rate (BER) at the temperature. While changing a value of the sense current Is inside the magnetic disk drive, an error rate is measured. Then, a sense current Is_opt at which the best error rate properties are achieved is selected as a new set value.

公开(公告)号：US08248893B2

公开(公告)日：2012-08-21

申请号：US12573069

申请日：2009-10-02

申请人： Masafumi Mochizuki ,  Hiroyasu Tanabe ,  Hideki Zaitsu ,  Hideaki Maeda

发明人： Masafumi Mochizuki ,  Hiroyasu Tanabe ,  Hideki Zaitsu ,  Hideaki Maeda

IPC分类号： G11B11/00

CPC分类号： G11B5/314 ,  G11B5/3116 ,  G11B5/6088 ,  G11B2005/0005 ,  G11B2005/0021

摘要： A head-slider configured to fly in proximity to a recording surface of a magnetic-recording disk. The head-slider includes a write element including a main pole configured to generate a magnetic-recording field from a pole tip of the main pole in a first localized portion of the magnetic-recording disk. The head-slider also includes a magnetic-recording assistance element configured to provide energy to a second localized portion of the magnetic-recording disk in order to increase reversibility of a magnetization in a first localized portion of the magnetic-recording disk. A width of the pole tip of the main pole on a leading-edge side is wider than a width of the pole tip of the main pole on a trailing-edge side.

摘要翻译： 头部滑动器，其构造成在磁记录盘的记录表面附近飞行。 磁头滑块包括写入元件，该写入元件包括主磁极，该主极被配置为在磁记录盘的第一局部部分中从主极的极尖产生磁记录场。 磁头滑动器还包括磁记录辅助元件，其被配置为向磁记录盘的第二局部部分提供能量，以增加磁记录盘的第一局部部分中的磁化的可逆性。 前缘侧的主极的极尖的宽度比后缘侧的主极的极尖的宽度宽。

公开(公告)号：US07969678B2

公开(公告)日：2011-06-28

申请号：US12615219

申请日：2009-11-09

申请人： Hiroyasu Tanabe ,  Hideaki Maeda ,  Hideki Zaitsu ,  Masafumi Mochizuki

发明人： Hiroyasu Tanabe ,  Hideaki Maeda ,  Hideki Zaitsu ,  Masafumi Mochizuki

IPC分类号： G11B27/36

CPC分类号： G11B5/012 ,  G11B5/09 ,  G11B5/455 ,  G11B2005/0005 ,  G11B2005/0021

摘要： In one embodiment, a magnetic disk drive includes a magnetic disk, a head slider for flying above the spinning magnetic disk, a pattern analyzer for analyzing a data pattern of data to be recorded on the magnetic disk to determine a recording current reversal timing and a recording assistance area in accordance with the analysis so that the rear end of the determined recording assistance area is shifted forward if the determined recording current reversal timing is earlier than a criterion, or the rear end of the determined recording assistance area is shifted backward if the determined recording current reversal timing is later than the criterion, a recording assistance element on the slider for forming the determined recording assistance area on the magnetic disk, and a recording element for recording the data on the magnetic disk using the recording current in accordance with the determined recording current reversal timing.

摘要翻译： 在一个实施例中，磁盘驱动器包括磁盘，用于在旋转磁盘上方飞行的磁头滑块，用于分析要记录在磁盘上的数据的数据模式以确定记录电流反转定时的模式分析器，以及 记录辅助区域，如果所确定的记录电流反转定时早于标准，则确定的记录辅助区域的后端向前移动，或者如果确定的记录辅助区域的后端如果 确定的记录电流反转时间晚于该标准，用于在磁盘上形成确定的记录辅助区域的滑块上的记录辅助元件，以及用于使用记录电流将数据记录在磁盘上的记录元件 确定记录电流反转时序。

公开(公告)号：US06657804B1

公开(公告)日：2003-12-02

申请号：US09451912

申请日：1999-12-01

申请人： Futoshi Tomiyama ,  Takehiko Hamaguchi ,  Toru Matsushita ,  Hideki Zaitsu ,  Reijiro Tsuchiya ,  Hisashi Takano

发明人： Futoshi Tomiyama ,  Takehiko Hamaguchi ,  Toru Matsushita ,  Hideki Zaitsu ,  Reijiro Tsuchiya ,  Hisashi Takano

IPC分类号： G11B1504

CPC分类号： G11B5/5526 ,  G11B5/59633

摘要： A magnetic recording disk drive can prevent the deterioration of the head off-track characteristics and the reduction of the drive performance even when an erase band asymmetry resulting from a skew angle exists. A write inhibit slice value for an inner peripheral side offset is made smaller than a write inhibit slice value for an outer peripheral side offset at a position where an erase band on the inner peripheral side is greater than an erase band on the outer peripheral side, so that the adjacent track on the outer peripheral side cannot easily erase a data track. On the contrary, the inner periphery and the outer periphery are paraphrased at a position where the erase band on the outer peripheral side is greater than the erase band on the inner peripheral side.

摘要翻译： 磁记录盘驱动器即使当存在由倾斜角度导致的擦除带不对称性时，也可以防止磁头偏离磁道特性的恶化和驱动性能的降低。 使内周侧偏移的写禁止限幅值小于在内周侧的擦除频带大于外周侧的擦除频带的位置处的外周侧偏移的写禁止限幅值， 使得外周侧的相邻轨道不能容易地擦除数据轨道。 相反，内周侧和外周侧在外周侧的擦除带大于内周侧的擦除带的位置被释义。

公开(公告)号：US06404576B1

公开(公告)日：2002-06-11

申请号：US09481399

申请日：2000-01-12

申请人： Takehiko Hamaguchi ,  Futoshi Tomiyama ,  Hideki Zaitsu ,  Hisashi Takano

发明人： Takehiko Hamaguchi ,  Futoshi Tomiyama ,  Hideki Zaitsu ,  Hisashi Takano

IPC分类号： G11B509

CPC分类号： B82Y10/00 ,  B82Y25/00 ,  G11B5/012 ,  G11B5/3909 ,  G11B5/5552 ,  G11B5/59611 ,  G11B2005/001 ,  G11B2005/0016

摘要： A plurality of patterns are formed so that each is deviated slightly from another in each sector in the track width direction. Then, the pattern is followed up, thereby obtaining both a full-track profile and a micro-track profile. A variation of a position signal is detected from this profile, thereby creating a table for correcting the non-linearity error of the position signal. Consequently, the distribution of the write/read-back property is measured, thereby enabling the track density to be improved. Furthermore, a variation of the position signal caused by a property variation of the head read-back element is detected and corrected, thereby enabling a high reliability and a high track density to be realized for the object magnetic recording disk apparatus.

摘要翻译： 形成多个图案，使得每个图案在轨道宽度方向上的每个扇区中与另一个略微偏离。 然后，跟踪图案，从而获得全轨道轮廓和微轨道轮廓。 从该轮廓检测位置信号的变化，由此创建用于校正位置信号的非线性误差的表格。 因此，测量写入/读回属性的分布，从而能够提高轨道密度。 此外，检测和校正由头读回元件的特性变化引起的位置信号的变化，从而能够实现对象磁记录盘装置的高可靠性和高轨道密度。

公开(公告)号：US07508619B2

公开(公告)日：2009-03-24

申请号：US11880236

申请日：2007-07-20

申请人： Hisao Okamoto ,  Hideki Zaitsu

发明人： Hisao Okamoto ,  Hideki Zaitsu

IPC分类号： G11B20/20 ,  G11B5/265

CPC分类号： G11B5/5547 ,  G11B5/012 ,  G11B5/1278 ,  G11B5/31 ,  G11B5/3113 ,  G11B5/3116

摘要： Embodiments in accordance with present invention provide a magnetic head and a magnetic disc drive capable of preventing a side erase while providing excellent recording characteristics. According to one embodiment, in order to prevent the side erase in an increased skew angle state, a first magnetic pole surface is formed in such a shape that the projection area of the first magnetic pole surface follows a track edge positioned on the boundary side in the track in the state where the first magnetic pole surface is positioned on the track at the innermost periphery thereof included in a first region. Likewise, to prevent the side erase in the increased skew angle state, a second magnetic pole surface is formed in such a shape that the projection area of the second magnetic pole surface follows a track edge positioned on the boundary side with respect to a track in the state where the second magnetic pole surface is positioned on the track at the outermost periphery thereof included in a second region.

摘要翻译： 根据本发明的实施例提供一种磁头和磁盘驱动器，其能够在提供优异的记录特性的同时防止侧面擦除。 根据一个实施例，为了防止在增加的倾斜角状态下的侧面擦除，第一磁极表面形成为使得第一磁极表面的投影区域沿着位于边界侧上的轨道边缘的形状 第一磁极表面位于包括在第一区域中的最内周边的轨道上的轨迹。 类似地，为了防止在增加的倾斜角状态下的侧面擦除，第二磁极表面形成为使得第二磁极表面的投影区域相对于轨道的轨迹位于边界侧上的轨道边缘 第二磁极表面位于包括在第二区域中的最外周的轨道上的状态。

公开(公告)号：US20060132951A1

公开(公告)日：2006-06-22

申请号：US11285904

申请日：2005-11-22

申请人： Hideki Zaitsu

发明人： Hideki Zaitsu

IPC分类号： G11B5/09 ,  G11B5/596

CPC分类号： G11B19/04 ,  G11B5/02 ,  G11B5/40 ,  G11B5/59655 ,  G11B2005/0016

摘要： Embodiments of the invention provide a magnetic read/write device capable of reading/writing data even when a reversal of the output polarity of the readback signal occurs. In one embodiment, a magnetic read/write device is provided which constantly checks the output polarity based on the polarity of the waveform of a signal obtained as a result of equalizing the waveform of a readback signal of gray code (indicating a cylinder number) in each servo sector by use of a matched filter (MF), or based on the waveform of a readback signal read from areas of a magnetic disk which store a special pattern for detecting the output polarity. When a polarity reversal has occurred, the magnetic read/write device assumes that a read error has occurred and performs processing so as not to perform any track seek or track following operation using decoded positional information. The magnetic read/write device then reverses the polarity of the output signal by use of a polarity reversing unit provided within or on the input side of a read/write channel, and resumes servo and read/write operations.

摘要翻译： 本发明的实施例提供即使当回读信号的输出极性反转时能够读/写数据的磁读/写装置。 在一个实施例中，提供了一种磁读/写装置，其基于由于将灰度代码（指示气缸数）的回读信号的波形均衡而获得的信号的波形的极性，不断地检查输出极性 每个伺服扇区通过使用匹配滤波器（MF），或者基于从存储用于检测输出极性的特殊模式的磁盘区域读取的回读信号的波形。 当发生极性反转时，磁读/写装置假设发生读错误，并且执行处理，以便不使用解码位置信息执行任何跟踪操作或跟踪跟踪操作。 然后，磁读/写装置通过使用设置在读/写通道的输入侧内或之上的极性反转单元来反转输出信号的极性，并且恢复伺服和读/写操作。

公开(公告)号：US06473254B1

公开(公告)日：2002-10-29

申请号：US09506270

申请日：2000-02-17

申请人： Takehiko Hamaguchi ,  Futoshi Tomiyama ,  Hideki Zaitsu ,  Hisashi Takano

发明人： Takehiko Hamaguchi ,  Futoshi Tomiyama ,  Hideki Zaitsu ,  Hisashi Takano

IPC分类号： G11B509

CPC分类号： B82Y10/00 ,  B82Y25/00 ,  G11B5/012 ,  G11B5/3909 ,  G11B5/5552 ,  G11B5/59611 ,  G11B2005/001 ,  G11B2005/0016

摘要： A plurality of patterns are formed so that each is deviated slightly from another in each sector in the track width direction. Then, the pattern is followed up, thereby obtaining both a full-track profile and a micro-track profile. A variation of a position signal is detected from this profile, thereby creating a table for correcting the non-linearity error of the position signal. Consequently, the distribution of the write/read-back property is measured, thereby enabling the track density to be improved. Furthermore, a variation of the position signal caused by a property variation of the head read-back element is detected and corrected, thereby enabling a high reliability and a high track density to be realized for the object magnetic recording disk apparatus.

公开(公告)号：US20130335856A1

公开(公告)日：2013-12-19

申请号：US13523657

申请日：2012-06-14

申请人： Hiroyasu Tanabe ,  Hideki Zaitsu ,  Kyo Akagi ,  Naoto Ito

发明人： Hiroyasu Tanabe ,  Hideki Zaitsu ,  Kyo Akagi ,  Naoto Ito

IPC分类号： G11B21/02 ,  G11B5/012

CPC分类号： G11B19/04 ,  G11B5/012 ,  G11B5/5565 ,  G11B5/59627 ,  G11B2005/0021

摘要： SMR disk drives are described that adjust track pitch or magnetic write width to compensate for external temperature effects. In one embodiment track pitch is increased when the media temperature increases. The temperature of magnetic media during write operations can be determined from the drives' temperature sensor. In other embodiments track pitch is adjusted based on the magnetic write width (MWW) which is determined from read-back testing of previously written data tracks. In an alternative embodiment, the width of the MWW is adjusted instead of the track pitch. The various factors that affect the MWW that can be used to increase or decrease the MWW, including write current characteristics and when available thermal-assistance parameters.

摘要翻译： 描述了SMR磁盘驱动器，其调节磁道间距或磁写入宽度以补偿外部温度效应。 在一个实施例中，当介质温度升高时，轨道间距增加。 写入操作期间磁介质的温度可以由驱动器的温度传感器确定。 在其他实施例中，基于从先前写入的数据轨道的回读测试确定的磁写入宽度（MWW）来调整轨道间距。 在替代实施例中，调整MWW的宽度而不是轨道间距。 影响MWW的各种因素可用于增加或减少MWW，包括写入电流特性和可用的热辅助参数。