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1. 发明授权

US06490115B1 Error recovery in unit using GMR sensor 失效
标题翻译：使用GMR传感器进行单位误差恢复
公开(公告)号：US06490115B1
公开(公告)日：2002-12-03
申请号：US09218724
申请日：1998-12-22
申请人： Hiroaki Suzuki , Koji Kurachi , Katsumi Suda , Hideo Asano , Kenji Okada , Makoto Takase , Akira Kibashi , Hiromi Nishimiya , Takao Matsui , Tatsuya Endo , Kenji Kuroki
发明人： Hiroaki Suzuki , Koji Kurachi , Katsumi Suda , Hideo Asano , Kenji Okada , Makoto Takase , Akira Kibashi , Hiromi Nishimiya , Takao Matsui , Tatsuya Endo , Kenji Kuroki
IPC分类号： G11B2102
CPC分类号： G11B5/09 , G11B19/04
摘要： A method and apparatus for recovering from operation errors arising in an information recording and reproducing unit using a head with a GMR sensor is described. The read and write operations of the unit comprise executing a first error recovery procedure for recovering the operation error, executing a first GMR evaluation procedure for evaluating the performance of the GMR sensor when the operation error cannot be recovered by the first error recovery procedure, and applying a resetting pulse to the GMR sensor in accordance with the first GMR evaluation procedure.
摘要翻译：描述了使用具有GMR传感器的头的信息记录和再现单元中出现的操作错误恢复的方法和装置。该单元的读写操作包括执行用于恢复操作错误的第一错误恢复过程，当通过第一错误恢复过程无法恢复操作错误时，执行用于评估GMR传感器的性能的第一GMR评估过程，以及根据第一GMR评估程序将复位脉冲施加到GMR传感器。

2. 发明授权

US06275028B1 Methods for initializing and/or resetting GMR heads by applying oppositely directed magnetic fields 失效
标题翻译：通过施加相反方向的磁场来初始化和/或复位GMR磁头的方法
公开(公告)号：US06275028B1
公开(公告)日：2001-08-14
申请号：US09220808
申请日：1998-12-23
申请人： Takao Matsui , Tatsuya Endo , Hiroaki Suzuki , Kenji Kuroki , Katsushi Yamaguchi , Hideo Asano
发明人： Takao Matsui , Tatsuya Endo , Hiroaki Suzuki , Kenji Kuroki , Katsushi Yamaguchi , Hideo Asano
IPC分类号： G11B539
CPC分类号： B82Y25/00 , B82Y10/00 , G01R33/093 , G11B5/3166 , G11B5/3189 , G11B5/455 , G11B5/465 , G11B5/4806 , G11B2005/0008 , G11B2005/0016 , G11B2005/3996 , Y10T29/49034
摘要： In accordance with the present invention, the initialization for orienting the magnetized directions of the free layers of GMR heads (mounted on the diagonally shaded surface of sliders 14) by an external magnetic field is again executed also for the opposite direction, thereby to increase the yield of the GMR heads. Further, it is determined whether the magnetized direction of the pinned layer of GMR heads can be once reversed to the opposite direction, thereby to select damaged GMR heads at an early stage. Then, by performing a reset while performing a quasi-static test for seeing the read back response of the GMR head after restoring the magnetized direction of the pinned layer to a positive rotation, a safe and efficient reset is executed. The reset can be executed not only by applying only a pulse, but also while providing an external magnetic field in the pinning direction, or only by giving a high magnetic field. A tool 500 can be commonly used for the initialization, reset, or read back response through each process level. For the quasi-static test, coils 531, 532, and 533 are selectively used as Helmholz coils.
摘要翻译：根据本发明，用于通过外部磁场定向GMR磁头自由层（安装在滑块14的斜面阴影表面上）的磁化方向的初始化也对于相反方向也被执行，从而增加产量的GMR头。此外，确定GMR磁头的被钉扎层的磁化方向是否可以反向一个相反的方向，从而在早期阶段选择损坏的GMR磁头。然后，通过在将被钉扎层的磁化方向恢复到正旋转之后执行用于观察GMR头的回读响应的准静态测试执行复位，执行安全且有效的复位。该复位不仅可以通过仅施加脉冲而且可以在钉扎方向上提供外部磁场，或者仅通过施加高磁场来执行。工具500可以通常用于通过每个处理级别的初始化，复位或回读响应。对于准静态测试，线圈531,532和533被选择性地用作Helmholz线圈。

3. 发明授权

US5561566A Information recording disk and drive system using no sector ID to increase data storage capacity 失效
标题翻译：信息记录磁盘和驱动系统不使用扇区ID来增加数据存储容量
公开(公告)号：US5561566A
公开(公告)日：1996-10-01
申请号：US356427
申请日：1994-12-15
申请人： Yuji Kigami , Koji Kurachi , Takao Matsui , Takashi Nakamura , Tsutomu Numata , Kenji Ogasawara , Mayumi Okada , Yuji Yokoe
发明人： Yuji Kigami , Koji Kurachi , Takao Matsui , Takashi Nakamura , Tsutomu Numata , Kenji Ogasawara , Mayumi Okada , Yuji Yokoe
IPC分类号： G11B20/10 , G11B5/012 , G11B5/09 , G11B19/02 , G11B20/12 , G11B20/18 , G11B27/10
CPC分类号： G11B20/1883 , G11B19/02 , G11B20/1258 , G11B5/012 , G11B2020/10916 , G11B2020/1234 , G11B2020/1282 , G11B2220/20
摘要： A disk drive having embedded servo information accesses data without using sector identifier recorded in each sector. When a signal sector pulse signal (SP) at the end of a servo area is detected in a dead state during start up, a first data state for the start of a sector transits to a second data state for the litter region of the sector being divided in accordance with the capacity stored in a current sector's pointer register. At the beginning of the sector, the contents of a next sector's pointer register is stored in current sector's pointer register and the contents of a next sector's operation register is stored in a current sector's operation register. Upon completion of sector processing, the first data state is maintained when the next sector is contiguous. When a terminate instruction is stored in current sector's operation register, the process moves to dead state. When the servo area arrives, the process moves to idle state. Responsive to this state, the magnetic head is activated to enable read and write operation for sectors having no sector identifier on the disk.
摘要翻译：具有嵌入式伺服信息的磁盘驱动器访问数据而不使用记录在每个扇区中的扇区标识符。当在起动期间在死区中检测到伺服区域结束处的信号扇区脉冲信号（SP）时，用于扇区开始的扇区的第一数据状态转换到第二数据状态，用于扇区的凋落物区域为根据存储在当前扇区的指针寄存器中的容量进行划分。在扇区的开始处，下一个扇区的指针寄存器的内容存储在当前扇区的指针寄存器中，下一个扇区的操作寄存器的内容存储在当前扇区的操作寄存器中。在扇区处理完成时，当下一扇区连续时，保持第一数据状态。当终止指令存储在当前扇区的操作寄存器中时，进程进入死区。当伺服区到达时，过程进入空闲状态。响应于该状态，磁头被激活，以便能够对盘上没有扇区标识符的扇区进行读写操作。

4. 发明授权

US5615063A Magnetoresistive head bias current switching based on skew angle 失效
标题翻译：基于偏斜角的磁阻头偏置电流切换
公开(公告)号：US5615063A
公开(公告)日：1997-03-25
申请号：US445513
申请日：1995-05-22
申请人： Kenji Kuroki , Takao Matsui
发明人： Kenji Kuroki , Takao Matsui
IPC分类号： G11B5/39 , G11B5/00 , G11B5/012 , G11B5/02 , G11B5/55 , G11B5/596 , G11B5/03
CPC分类号： G11B5/59683 , G11B5/012 , G11B2005/0018 , G11B5/39 , G11B5/553
摘要： A controller 40 of an HDC 30 is connected to a drive 28, and an arm is rotated through a predetermined angle. A magnetic head 20 on the arm comprises a recording element and a reproduction element. A bias current is supplied to the magnetic head 20 from the controller 40 through a driver 36A and a switching circuit 32A, and the magnetic field of the disk 18A is detected in a detector 38A through a switching circuit 32A. The switching circuit 32A inverts the polarity of a current applied to the magnetic head 20A, by a signal from the controller 40 corresponding to a skew angle. Accordingly, the direction of the bias magnetic field is changed, the effective sensitivity position of the reproduction element approaches the recording element, and off-track can be reduced.
摘要翻译： HDC 30的控制器40连接到驱动器28，并且臂旋转预定角度。臂上的磁头20包括记录元件和再现元件。通过驱动器36A和开关电路32A从控制器40向磁头20提供偏置电流，并且通过开关电路32A在检测器38A中检测盘18A的磁场。开关电路32A通过来自控制器40的对应于偏斜角的信号来反转施加到磁头20A的电流的极性。因此，偏置磁场的方向改变，再现元件的有效灵敏度位置接近记录元件，并且偏离磁道可以减小。

5. 发明授权

US06650491B2 System and method for setting a read/write offset and for recovering from data read errors 失效
标题翻译：用于设置读/写偏移量和从数据读取错误中恢复的系统和方法
公开(公告)号：US06650491B2
公开(公告)日：2003-11-18
申请号：US09791445
申请日：2001-02-23
申请人： Hiroaki Suzuki , Kaoru Umemura , Akira Shibata , Tatsuya Endoh , Takao Matsui , Masaomi Ikeda , Junji Hashimoto
发明人： Hiroaki Suzuki , Kaoru Umemura , Akira Shibata , Tatsuya Endoh , Takao Matsui , Masaomi Ikeda , Junji Hashimoto
IPC分类号： G11B2736
CPC分类号： G11B5/012 , G11B5/4886 , G11B5/59611 , G11B21/106 , G11B2005/001
摘要： An RW offset setting method which includes recording a test pattern by a write head, reading the test pattern by a read head, measuring an amplitude of a read back signal at each tracking position, finding an approximate expression of a profile of the measured amplitude, finding a tracking position, and finding a RW offset based on this tracking position, setting a RW offset for all tracks in the disk device based on the RW offsets about the plurality of tracks to be measured. A read data error recovery method that includes the steps of determining an off-track direction where the amplitude increases, searching an off-track position where the amplitude becomes a local maximum, measuring the amplitude at each off-track position reading data recorded in the data sector.
摘要翻译：一种RW偏移设置方法，包括通过写入头记录测试图案，通过读取头读取测试图案，测量每个跟踪位置处的回读信号的幅度，找到测量幅度的轮廓的近似表达，找到跟踪位置，并且基于该跟踪位置找到RW偏移，基于关于待测量的多个轨迹的RW偏移来设置盘装置中的所有轨道的RW偏移。一种读取数据错误恢复方法，包括以下步骤：确定幅度增加的偏离磁道方向，搜索幅度变为局部最大值的偏离磁道位置，测量记录在数据部门。

6. 发明授权

US08048527B2 Shaped expanded graphite article and method for producing the same 有权
标题翻译：成形膨胀石墨制品及其制造方法
公开(公告)号：US08048527B2
公开(公告)日：2011-11-01
申请号：US10526350
申请日：2003-09-03
申请人： Yoshiaki Hirose , Takao Matsui
发明人： Yoshiaki Hirose , Takao Matsui
IPC分类号： B32B9/00
CPC分类号： C04B41/009 , C01B32/20 , C04B35/536 , C04B35/62218 , C04B41/5092 , C04B41/85 , C04B2235/608 , C04B2235/77 , C04B2235/9684 , Y10T428/30 , C04B41/5058
摘要： A formed exfoliated graphite article which comprises an oxidation-resistant coating layer formed at least in the surface layer portion thereof, preferably wherein the oxidation-resistant coating layer contains a boron element and a phosphorus element, the content of a boron element in the oxidation-resistant coating layer is 1 mass % or more, the content of a phosphorus in the oxidation-resistant coating layer is 0.1 mass % or more, and the oxidation-resistant coating layer is formed in a thickness of 0.5 μm or more.
摘要翻译：一种形成的剥离石墨制品，其至少在其表层部分形成有抗氧化涂层，优选地，其中抗氧化涂层含有硼元素和磷元素，氧化 - 耐酸性涂层为1质量％以上，耐氧化性涂层中的磷含量为0.1质量％以上，耐氧化性涂层形成为0.5μm以上。

7. 发明授权

US07852594B2 Device and method for specifying control value for controlling clearance between head and disk, and magnetic disk drive device 有权
标题翻译：用于指定用于控制磁头和磁盘之间的间隙的控制值的装置和方法以及磁盘驱动装置
公开(公告)号：US07852594B2
公开(公告)日：2010-12-14
申请号：US12156092
申请日：2008-05-28
申请人： Yoshihiko Maeda , Takao Matsui , Nobuhiro Kuwamura , Kenichi Kuramoto , Akihiro Sera
发明人： Yoshihiko Maeda , Takao Matsui , Nobuhiro Kuwamura , Kenichi Kuramoto , Akihiro Sera
IPC分类号： G11B21/02
CPC分类号： G11B5/6064 , G11B5/607
摘要： Embodiments of the present invention help to detect contact between a head and a magnetic disk more accurately in specifying a heater power value for adjusting a clearance between a head element portion and the disk. According to one embodiment, a hard disk controller/multiprocessing unit (HDC/MPU) measures amplitudes of read signals in a user data field DATA. A hard disk drive (HDD) fills a gap between servo data with single data sector. The HDC/MPU measures the amplitudes of read signals in each data sector at different heater power values. It determines the heater power value at which contact occurs from the measured values.
摘要翻译：本发明的实施例有助于在确定用于调节头元件部分和盘之间的间隙的加热器功率值时更准确地检测磁头和磁盘之间的接触。根据一个实施例，硬盘控制器/多处理单元（HDC / MPU）测量用户数据字段DATA中的读取信号的幅度。硬盘驱动器（HDD）填充伺服数据与单个数据扇区之间的间隙。 HDC / MPU以不同的加热器功率值测量每个数据扇区中读取信号的幅度。它从测量值确定接触发生的加热器功率值。

8. 发明申请

US20070263310A1 Disk drive 有权
标题翻译：磁盘驱动器
公开(公告)号：US20070263310A1
公开(公告)日：2007-11-15
申请号：US11796134
申请日：2007-04-25
申请人： Masaomi Ikeda , Takao Matsui , Masahiko Koizumi , Masato Taniguchi , Kohji Nakao , Hideaki Maeda
发明人： Masaomi Ikeda , Takao Matsui , Masahiko Koizumi , Masato Taniguchi , Kohji Nakao , Hideaki Maeda
IPC分类号： G11B20/10
CPC分类号： G11B20/10009 , G11B20/10027 , G11B20/10046 , G11B20/10481 , G11B20/18 , G11B20/1833 , G11B27/36 , G11B2005/0016 , G11B2020/1863 , G11B2220/2516
摘要： Embodiments in accordance with the present invention provide a magnetic disk drive capable of achieving error recovery stably in a simple configuration in the event of thermal asperity (TA) and minimizing the error recovery time required, and a method for controlling the disk drive. According to one embodiment, if TA occurs, a cutoff frequency of a high-pass filter to which a data read signal is input is first increased and a loop gain of a low-order finite impulse response (FIR) filter connected in series to an FIR filter is also increased as high as possible. Next, a Viterbi decoder to which a signal is input from the low-order FIR filter provides feedback to the low-order FIR filter so that an input signal error becomes a minimum. Tap coefficients of the low-order FIR filter are thus optimized.
摘要翻译：根据本发明的实施例提供一种磁盘驱动器，其能够在热不均匀（TA）的情况下以简单的配置稳定地实现误差恢复，并且使所需的错误恢复时间最小化，以及控制盘驱动器的方法。根据一个实施例，如果发生TA，则首先增加输入数据读取信号的高通滤波器的截止频率，并将低阶有限脉冲响应（FIR）滤波器的环路增益串联连接到 FIR滤波器也尽可能高地增加。接下来，从低阶FIR滤波器输入信号的维特比解码器向低阶FIR滤波器提供反馈，使得输入信号误差变得最小。因此优化了低阶FIR滤波器的抽头系数。

9. 发明申请

US20060117140A1 Memory control device and memory control method 审中-公开
标题翻译：内存控制装置和内存控制方式
公开(公告)号：US20060117140A1
公开(公告)日：2006-06-01
申请号：US11066760
申请日：2005-02-28
申请人： Takao Matsui , Seishi Okada , Daisuke Itoh , Makoto Hataida , Toshikazu Ueki
发明人： Takao Matsui , Seishi Okada , Daisuke Itoh , Makoto Hataida , Toshikazu Ueki
IPC分类号： G06F12/00
CPC分类号： G06F12/0822
摘要： Address information of target data is stored in an ELA register at the start of a cache excluding process performed by BackEviction, and a request processing unit continuously re-executes a data acquiring process while an address of data requested to be acquired by a processor is present in the ELA register. The address information of the target data is stored in an EWB buffer at the start of autonomous move-out performed by a processor, and the cache excluding process performed by BackEviction is stopped when the address of data subjected to BackEviction is present in the EWB buffer.
摘要翻译：目标数据的地址信息在由BackEviction执行的高速缓存排除处理开始时存储在ELA寄存器中，并且请求处理单元连续重新执行数据获取处理，同时存在由处理器请求获取的数据的地址在ELA寄存器中。目标数据的地址信息在由处理器执行的自主移出开始时被存储在EWB缓冲器中，并且当经过BackEviction的数据的地址存在于EWB缓冲器中时，停止由BackEviction执行的高速缓存排除处理。

10. 发明申请

US20050061954A1 Receiving circuit for free-space optical communication 有权
标题翻译：自由空间光通信接收电路
公开(公告)号：US20050061954A1
公开(公告)日：2005-03-24
申请号：US10928087
申请日：2004-08-30
申请人： Hiroaki Itoh , Naruichi Yokogawa , Takao Matsui
发明人： Hiroaki Itoh , Naruichi Yokogawa , Takao Matsui
IPC分类号： H03F3/08 , H01J40/14 , H01L31/00 , H03F1/26 , H03G3/20 , H03G3/30 , H04B10/11 , H04B10/112 , H04B10/2507 , H04B10/40 , H04B10/50 , H04B10/60
CPC分类号： H03F3/08
摘要： An amplifier circuit AMP1 amplifies the difference between an output voltage from a current voltage conversion circuit 1 and a bias voltage. The current voltage conversion circuit 1 converts a photocurrent of a photodiode PD which detect incoming light into a voltage. A gm-amp AMP2 charges or discharges a capacity C1 by a current corresponding to the difference between the output voltage from the amplifier circuit AMP1 and a reference voltage V3. A field effect transistor M3 supplies a drain current, which is controlled by voltages at the respective terminals of the capacity C1, to the photodiode PD, in order to prevent the output voltage of the amplifier circuit AMP1 from being varied due to the influence of a DC photocurrent flowing in the photodiode PD. The gate of a field effect transistor M1 which is connected in parallel to a current voltage conversion resistor R1 has an identical voltage with the gate of the field effect transistor M3. On this account, as the DC photocurrent increases, the resistance decreases and the current voltage conversion resistor value decreases, and hence a noise voltage caused by shot noise decreases. As a result, the malfunction due to the shot noise generated in the photodiode is prevented.
摘要翻译：放大电路AMP1放大来自电流电压转换电路1的输出电压与偏置电压之间的差。当前的电压转换电路1将检测入射光的光电二极管PD的光电流转换为电压。放大器AMP2通过对应于来自放大器电路AMP1的输出电压与参考电压V3之间的差的电流对电容C1进行充电或放电。场效应晶体管M3将由电容C1的各个端子处的电压控制的漏极电流提供给光电二极管PD，以防止放大器电路AMP1的输出电压由于a的影响而变化 DC光电流在光电二极管PD中流动。与电流电压转换电阻R1并联连接的场效应晶体管M1的栅极与场效应晶体管M3的栅极具有相同的电压。因此，随着直流光电流的增加，电阻降低，电流转换电阻值减小，因此引起的噪声电压降低。结果，防止了由光电二极管中产生的散粒噪声引起的故障。

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