公开(公告)号：US06985504B2

公开(公告)日：2006-01-10

申请号：US10368206

申请日：2003-02-18

申请人： Tetsuo Ueda ,  Keiji Yamane ,  Isao Kidoguchi ,  Shoji Fujimori

发明人： Tetsuo Ueda ,  Keiji Yamane ,  Isao Kidoguchi ,  Shoji Fujimori

IPC分类号： H01S5/00

CPC分类号： H01S5/028

摘要： A semiconductor laser includes an active layer formed on a substrate and a pair of cladding layers sandwiching the active layer. On at least one of resonator end faces of the semiconductor laser, a first dielectric film with hydrogen added therein is provided. Between the first dielectric film and the resonator end face, a second dielectric film for suppressing the diffusion of hydrogen is provided. Even when a semiconductor laser with an end face coating film including a hydrogen-added film is exposed to high temperatures, peeling of the end face coating film and deterioration of the end face coating film can be suppressed.

公开(公告)号：US20050059181A1

公开(公告)日：2005-03-17

申请号：US10931206

申请日：2004-09-01

申请人： Keiji Yamane ,  Tetsuo Ueda ,  Isao Kidoguchi ,  Toshiya Kawata

发明人： Keiji Yamane ,  Tetsuo Ueda ,  Isao Kidoguchi ,  Toshiya Kawata

IPC分类号： H01S5/028 ,  H01L21/00 ,  H01L21/26 ,  H01L21/42 ,  H01S5/00 ,  H01S5/02 ,  H01S5/16 ,  H01S5/22 ,  H01S5/223 ,  H01S5/343

CPC分类号： B82Y20/00 ,  H01S5/0202 ,  H01S5/028 ,  H01S5/0287 ,  H01S5/168 ,  H01S5/2206 ,  H01S5/2214 ,  H01S5/2231 ,  H01S5/34333

摘要： A method for manufacturing a semiconductor laser. As a preparative step for coating an end face of a resonator with a dielectric film, a cleavage plane of a semiconductor laminated structure that is to be the end face is subjected to a plasma cleaning to prevent a conductive film, which absorbs laser light, from attaching to the cleavage plane. During the plasma cleaning, a first process gas containing argon gas and nitrogen gas is introduced into a vacuumed ECR sputtering apparatus. After the cleavage plane is exposed to the first process gas in the plasma state for a certain time period without application of a voltage, a second process gas containing argon gas and oxygen gas is introduced, and the cleavage plane is exposed to the second process gas in the plasma state while a voltage is applied to the silicon target.

摘要翻译： 一种半导体激光器的制造方法。 作为用电介质膜涂覆谐振器的端面的制备步骤，将作为端面的半导体叠层结构的解理面进行等离子体清洗，以防止吸收激光的导电膜 附着于解理面。 在等离子体清洗期间，将含有氩气和氮气的第一工艺气体引入真空的ECR溅射装置中。 在不施加电压的情况下，在等离子体状态下将解理面暴露于等离子体状态的第一工艺气体一定时间后，引入含有氩气和氧气的第二工艺气体，并将解理面暴露于第二工艺气体 处于等离子体状态，同时向硅靶施加电压。

公开(公告)号：US06671110B2

公开(公告)日：2003-12-30

申请号：US09776360

申请日：2001-02-02

申请人： Sachiyo Baba ,  Yukio Fukushima ,  Hidetsugu Tanka ,  Tetsuo Ueda

发明人： Sachiyo Baba ,  Yukio Fukushima ,  Hidetsugu Tanka ,  Tetsuo Ueda

IPC分类号： G11B2736

CPC分类号： G11B21/21 ,  G11B5/012 ,  G11B5/6029

摘要： A method and apparatus for detecting an abnormal fly height of a magnetic head. The method includes reproducing a servo signal recorded on a magnetic disk in advance by the magnetic head when a write operation for writing data on the magnetic disk by the magnetic head is initiated. Next, the gain of the servo signal based on the head part of the servo signal reproduced by the magnetic head is determined. The gain of the servo signal is then compared with a reference value to detect an abnormal fly height of the magnetic head. In an advantageous embodiment, the reference value is the gain of a servo signal determined when the fly height of the magnetic head is normal. Alternatively, in other advantageous embodiments, the reference value is based on the gain of a previous servo signal.

摘要翻译： 一种用于检测磁头的异常飞行高度的方法和装置。 该方法包括当通过磁头写入磁盘上的数据的写入操作时，由磁头预先再现记录在磁盘上的伺服信号。 接下来，确定基于由磁头再现的伺服信号的头部的伺服信号的增益。 然后将伺服信号的增益与参考值进行比较，以检测磁头的异常飞行高度。 在有利的实施例中，参考值是当磁头的飞行高度正常时确定的伺服信号的增益。 或者，在其他有利的实施例中，参考值基于先前伺服信号的增益。

公开(公告)号：US06441982B1

公开(公告)日：2002-08-27

申请号：US09448234

申请日：1999-11-24

申请人： Yukio Fukushima ,  Tetsuo Ueda ,  Hideo Asano

发明人： Yukio Fukushima ,  Tetsuo Ueda ,  Hideo Asano

IPC分类号： G11B509

CPC分类号： G11B5/00 ,  G11B5/012 ,  G11B2005/0008 ,  G11B2005/0013 ,  G11B2005/0021

摘要： A drive unit which recovers from write instability by heating the magnetic head prior to performing a dummy write operation is described. In the preferred embodiments, once write instability has been detected the head may be heated by friction with the rotating disk or by an external heater. In the friction method the head is moved to a safe area of the disk such as a textured landing zone while the disk rotation is continued. In drives using unload ramps, a heater is preferably placed at the the ramp so that the head can be heated while parked on the ramp. In each of these embodiments dummy write operations are performed while the head is in a thermally excited state due to the heating. The combination of heating and the dummy write operation aids in restoring write stability.

摘要翻译： 描述通过在执行虚拟写入操作之前加热磁头而从写入不稳定性恢复的驱动单元。 在优选实施例中，一旦检测到写入不稳定性，头部可以通过与旋转盘的摩擦或外部加热器的摩擦来加热。 在摩擦方法中，当盘旋转持续时，头移动到盘的安全区域，例如纹理着陆区。 在使用卸载斜坡的驱动器中，优选地将加热器放置在斜坡处，使得头部可以在停放在斜坡上时被加热。 在这些实施例的每一个中，由于加热，头部处于热激发状态时执行伪写入操作。 加热和虚拟写入操作的组合有助于恢复写入稳定性。

公开(公告)号：US6049439A

公开(公告)日：2000-04-11

申请号：US982737

申请日：1997-12-02

申请人： Hiroyuki Ono ,  Tetsuo Ueda ,  Kazushige Okutsu

发明人： Hiroyuki Ono ,  Tetsuo Ueda ,  Kazushige Okutsu

IPC分类号： G11B5/012 ,  G11B19/04 ,  G11B19/28 ,  G11B20/18 ,  G11B23/50 ,  G11B25/04 ,  G11B33/14 ,  G11B5/09 ,  G11B15/46

CPC分类号： G11B5/012 ,  G11B19/04 ,  G11B19/28 ,  G11B25/043 ,  G11B23/505 ,  G11B23/507 ,  G11B33/14

摘要： A method and apparatus for improving the data readability in a disk drive is described. The disk drive uses an error recovery mode in which the rotational speed of the motor is decreased below the normal operating speed and a rereading is performed. The reduced speed lowers the energy generated in collisions with a foreign object and the data error length is shortened allowing data to be read which cannot be read at the normal operating speed.

摘要翻译： 描述了一种用于提高磁盘驱动器中的数据可读性的方法和装置。 磁盘驱动器使用错误恢复模式，其中电动机的转速降低到正常操作速度以下，并进行重新读取。 降低的速度降低与异物碰撞时产生的能量，并且缩短数据错误长度，从而允许读取不能以正常操作速度读取的数据。

公开(公告)号：US08503124B2

公开(公告)日：2013-08-06

申请号：US12562911

申请日：2009-09-18

申请人： Hiroshi Uchida ,  Tetsuo Ueda ,  Chikako Sasaki ,  Isao Yoneda ,  Masahito Nitta

发明人： Hiroshi Uchida ,  Tetsuo Ueda ,  Chikako Sasaki ,  Isao Yoneda ,  Masahito Nitta

IPC分类号： G11B5/02

CPC分类号： G11B5/59622 ,  G11B19/042

摘要： A servo control system configured to position a head in accordance with position error signals between servo data on a disk read by the head in a servo sampling cycle and a target position. The system includes a plurality of adaptive peak filters connected in parallel configured to filter the position error signals and configured to change filter coefficients adaptively, and an estimator configured to estimate head vibration caused by disturbances using the servo data read by the head. The system further includes a selector configured to select a portion of the plurality of adaptive peak filters at preset occasions, and a setter configured to update coefficient settings of the portion of the adaptive peak filters selected by the selector in accordance with an estimation by the estimator.

摘要翻译： 一种伺服控制系统，其被配置为根据在伺服采样周期中由磁头读取的磁盘上的伺服数据与目标位置之间的位置误差信号来定位磁头。 该系统包括并联连接的多个自适应峰值滤波器，被配置为过滤位置误差信号并被配置为自适应地改变滤波器系数;以及估计器，被配置为使用由磁头读取的伺服数据来估计由干扰引起的头部振动。 该系统还包括一个选择器，被配置为在预设场合选择多个自适应峰值滤波器的一部分，以及一个被配置为根据估计器的估计来更新由选择器选择的自适应峰值滤波部分的系数设置 。

公开(公告)号：US07986486B2

公开(公告)日：2011-07-26

申请号：US12470460

申请日：2009-05-21

申请人： Jiro Abe ,  Hiroshi Uchida ,  Tetsuo Ueda

发明人： Jiro Abe ,  Hiroshi Uchida ,  Tetsuo Ueda

IPC分类号： G11B21/02

CPC分类号： G11B5/09 ,  G11B19/045 ,  G11B2220/2516 ,  Y10T29/49025

摘要： A hard-disk drive. The hard-disk drive includes a magnetic-recording disk having a plurality of tracks formed thereon. The hard-disk drive also includes a magnetic-recording head configured to be positioned over a target track selected from the plurality of tracks and configured to write data to and to read data from the target track. Moreover, the hard-disk drive includes a range-definer configured to define an allowed range of a position error of the magnetic-recording head corresponding to the target track. In addition, the hard-disk drive includes a write-enabler configured to determine whether writing data by the magnetic-recording head is allowed based on the position error of the magnetic-recording head with respect to the target track and the allowed range that is calculated from data read out by the magnetic-recording head.

摘要翻译： 硬盘驱动器。 硬盘驱动器包括其上形成有多个轨道的磁记录盘。 硬盘驱动器还包括磁记录头，其被配置为定位在从多个轨道中选择的目标轨道上方，并被配置为向目标轨道写入数据并从其读取数据。 此外，硬盘驱动器包括范围定义器，其被配置为限定对应于目标轨道的磁记录头的位置误差的允许范围。 此外，硬盘驱动器还包括写使能器，其配置为基于磁记录头相对于目标轨迹的位置误差和允许的范围是否允许由磁记录头写入数据， 由磁记录头读出的数据计算出来。

公开(公告)号：US20110069411A1

公开(公告)日：2011-03-24

申请号：US12562911

申请日：2009-09-18

申请人： Hiroshi Uchida ,  Tetsuo Ueda ,  Chikako Sasaki ,  Isao Yoneda ,  Masahito Nitta

发明人： Hiroshi Uchida ,  Tetsuo Ueda ,  Chikako Sasaki ,  Isao Yoneda ,  Masahito Nitta

IPC分类号： G11B5/596

CPC分类号： G11B5/59622 ,  G11B19/042

摘要： A servo control system configured to position a head in accordance with position error signals between servo data on a disk read by the head in a servo sampling cycle and a target position. The system includes a plurality of adaptive peak filters connected in parallel configured to filter the position error signals and configured to change filter coefficients adaptively, and an estimator configured to estimate head vibration caused by disturbances using the servo data read by the head. The system further includes a selector configured to select a portion of the plurality of adaptive peak filters at preset occasions, and a setter configured to update coefficient settings of the portion of the adaptive peak filters selected by the selector in accordance with an estimation by the estimator.

摘要翻译： 一种伺服控制系统，其被配置为根据在伺服采样周期中由磁头读取的磁盘上的伺服数据与目标位置之间的位置误差信号来定位磁头。 该系统包括并联连接的多个自适应峰值滤波器，被配置为过滤位置误差信号并被配置为自适应地改变滤波器系数;以及估计器，被配置为使用由磁头读取的伺服数据来估计由干扰引起的头部振动。 该系统还包括一个选择器，被配置为在预设场合选择多个自适应峰值滤波器的一部分，以及一个被配置为根据估计器的估计来更新由选择器选择的自适应峰值滤波部分的系数设置 。

公开(公告)号：US07298566B2

公开(公告)日：2007-11-20

申请号：US11064698

申请日：2005-02-23

申请人： Tetsuo Ueda ,  Kazuyuki Ishibashi ,  Satoshi Ishii ,  Masaaki Noguchi

发明人： Tetsuo Ueda ,  Kazuyuki Ishibashi ,  Satoshi Ishii ,  Masaaki Noguchi

IPC分类号： G11B27/36 ,  G11B21/02 ,  G11B15/12

CPC分类号： G11B5/6005 ,  G11B5/40 ,  G11B5/6029 ,  G11B21/21

摘要： Embodiments of the invention are directed to detecting an abnormality in head flying height. In one embodiment, an AGC controller establishes the gain of the reproduced signal through gain adjustment using the servo AGC of the servo signal. A digital filter performs filtering processing by use of the obtained gain data g and the gain data of previous sectors. A comparative judgment section obtains filtered gain data G from the digital filter and compares the gain data G with a reference value CRITERIA to determine whether the flying height is normal or abnormal. If the gain G is larger than the reference value CRITERIA, then the data write operation is inhibited. The filter parameters of the digital filter are programmable parameters which can be set and changed.

摘要翻译： 本发明的实施例涉及检测头部飞行高度的异常。 在一个实施例中，AGC控制器通过使用伺服信号的伺服AGC的增益调整来建立再生信号的增益。 数字滤波器通过使用获得的增益数据g和先前扇区的增益数据来执行滤波处理。 比较判断部分从数字滤波器获得滤波后的增益数据G，并将增益数据G与参考值CRITERIA进行比较，以确定飞行高度是正常还是异常。 如果增益G大于参考值CRITERIA，则禁止数据写入操作。 数字滤波器的滤波器参数是可设置和更改的可编程参数。

公开(公告)号：US20070070540A1

公开(公告)日：2007-03-29

申请号：US11527899

申请日：2006-09-26

申请人： Masaaki Noguchi ,  Tetsuo Ueda ,  Gaku Ikedo ,  Mirei Hosono

发明人： Masaaki Noguchi ,  Tetsuo Ueda ,  Gaku Ikedo ,  Mirei Hosono

IPC分类号： G11B21/02

CPC分类号： G11B5/59694 ,  G11B5/5582

摘要： Embodiments of the present invention provide a disk drive capable of reducing, by means of simple control, vibrations applied to the drive and vibrations occurring in the drive, and a control method for controlling the disk drive. In one embodiment, a servo system comprises a sensor unit for detecting vibrations, a correction signal generator for, when the sensor unit detects vibrations, generating a correction signal, a position error signal generator for generating a PES signal on the basis of servo data read out from a disk and a target position, a servo controller for generating a servo control signal for controlling a position of a head on the basis of the PES signal, and a servo controller for generating a driving signal on the basis of the correction signal and the servo control signal. The correction signal generator includes a plurality of filters, each of which eliminates vibrations in each different frequency band, the correction signal generator selecting one or two or more RV-FF filters when vibrations are detected, and then generating a correction signal so as to reduce a position error indicated by the PES signal.

摘要翻译： 本发明的实施例提供一种能够通过简单的控制来减少施加在驱动器上的振动和驱动中发生的振动的磁盘驱动器，以及用于控制磁盘驱动器的控制方法。 在一个实施例中，伺服系统包括用于检测振动的传感器单元，当传感器单元检测振动时产生校正信号的校正信号发生器，用于根据伺服数据读取产生PES信号的位置误差信号发生器 从盘和目标位置出来的伺服控制器，用于产生用于根据PES信号控制头的位置的伺服控制信号的伺服控制器，以及用于基于校正信号产生驱动信号的伺服控制器，以及 伺服控制信号。 校正信号发生器包括多个滤波器，每个滤波器消除每个不同频带的振动，校正信号发生器在检测到振动时选择一个或两个或更多个RV-FF滤波器，然后产生校正信号以便减少 由PES信号指示的位置误差。