公开(公告)号：US6104557A

公开(公告)日：2000-08-15

申请号：US790422

申请日：1997-01-30

申请人： Kiichiro Kasai ,  Toshiki Kimura

发明人： Kiichiro Kasai ,  Toshiki Kimura

IPC分类号： G11B5/09 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/39 ,  G11B19/04 ,  G11B20/10 ,  G11B20/14 ,  G11B33/10

CPC分类号： G11B20/10203 ,  G11B19/04 ,  G11B20/10037 ,  G11B33/10 ,  G11B5/012 ,  G11B2005/0016

摘要： A magnetic disk reproducing apparatus for reproducing data recorded at an arbitrary position on a rotating disk by a head includes a level detecting unit for detecting a level of a DC component of a reproduced signal outputted from the head; a delaying unit for delaying the reproduced signal by a predetermined value; and a correcting unit for correcting the level of the DC component of the reproduced signal outputted from the delaying unit when the level of the DC component detected by the level detecting unit becomes larger than a predetermined threshold level. Preferably, a control method of a magnetic disk reproducing apparatus having such a construction includes the steps of detecting a level of a DC component of a reproduced signal outputted from the head; delaying the reproduced signal by a predetermined value; and correcting the level of the DC component of the delayed reproduced signal when the level of the DC component so detected becomes larger than a predetermined threshold level.

摘要翻译： 用于再现记录在旋转盘上的任意位置的数据的磁盘重放装置包括一个电平检测单元，用于检测从磁头输出的再现信号的直流分量的电平; 延迟单元，用于将再现信号延迟预定值; 以及校正单元，用于当由电平检测单元检测到的直流分量的电平变得大于预定阈值电平时，校正从延迟单元输出的再生信号的直流分量的电平。 优选地，具有这种结构的磁盘再现装置的控制方法包括以下步骤：检测从头部输出的再现信号的DC分量的电平; 将再现信号延迟预定值; 以及当所检测的DC分量的电平变得大于预定阈值电平时，校正延迟再现信号的DC分量的电平。

公开(公告)号：US5218504A

公开(公告)日：1993-06-08

申请号：US717012

申请日：1991-06-18

申请人： Toshiki Kimura

发明人： Toshiki Kimura

IPC分类号： G06F3/06 ,  G11B5/09 ,  G11B19/04

CPC分类号： G11B19/04

摘要： A disc-drive apparatus includes a writing unit responsive to a head select signal fed from a host controller, for selecting one of a plurality of heads to write write data into a medium, a power supply voltage generating unit for generating at least one power supply voltage, a unit for monitoring the power supply voltage fed to the writing unit and, upon detecting an abnormality of the monitored power supply voltage, outputting a reset signal, and a latching unit for retaining the head select signal to be fed to the writing unit. Upon receipt of the reset signal, the latching unit prohibits a latching and switching operation to be carried out by a subsequent head select signal fed from the host controller and maintains an output state of the retained head select signal, while the power supply voltage generating unit stops a supply of the power supply voltage to the writing unit. As a result, it is possible to prevent data in the medium from being destroyed due to a change or re-writing thereof by a malfunction of head selection operation occurring during a transient state of a lowering of the power supply voltage, or the like.

公开(公告)号：US5120985A

公开(公告)日：1992-06-09

申请号：US468541

申请日：1990-01-23

申请人： Toshiki Kimura

发明人： Toshiki Kimura

IPC分类号： G11B20/10

CPC分类号： G11B20/10212 ,  G11B20/10009

摘要： A data reproducing circuit for a memory system having a data sensing head includes a first equalizing circuit for correcting a shift of a position of a peak of a reproduction signal supplied from the data sensing head and for generating a first signal in which the shift of the position of the peak has been corrected, and a second equalizing circuit for correcting a variation in an amplitude of the reproduction signal supplied from the data sensing head and for generating a second signal in which the variation of the amplitude of the reproduction signal has been corrected. A peak position detecting circuit detects the position of the peak of the reproduction signal from the first signal supplied from the first equalizing circuit. An amplitude detecting circuit detects the amplitude of the reproduction signal from the second signal supplied from the second equalizing circuit. A gate circuit generates a pulsed reproduction signal from the peak position detected by the peak position detecting circuit and the amplitude detected by the amplitude detecting circuit.

公开(公告)号：US5163003A

公开(公告)日：1992-11-10

申请号：US500055

申请日：1990-03-27

申请人： Toshiki Kimura

发明人： Toshiki Kimura

IPC分类号： G11B5/09 ,  G11B20/10 ,  G11B20/14

CPC分类号： G11B20/10212 ,  G11B20/1426 ,  G11B5/09

摘要： A data reproducing circuit, and more particularly, a data reproducing circuit which records magnetization reversal patterns corresponding to a written digital signal onto a magnetic recording medium, and converts a received analog signal from the magnetic recording medium into a digital signal. The present invention has a pre-shift circuit to perform peak shift compensation in the recording process, an equalizer to perform peak shift compensation in the reproducing process, and a digital data reproducing circuit to reproduce data by differentiating the equalized signal received from the equalizer and generating a window signal. The equalizer means contains the first equalizer which compensates the peak position shifting in the received analog signal from the magnetic head and outputs the equalized signal used for differentiation, and the second equalizer which corrects the peak level variation of the analog signal and outputs the equalized signal used for window signal generation. Use of these equalizers with the pre-shift circuit assures margins for noises in the reproducing process along with a sufficient peak shift compensation.

公开(公告)号：US06141168A

公开(公告)日：2000-10-31

申请号：US568860

申请日：1995-12-05

申请人： Tsuyoshi Takahashi ,  Toshiki Kimura

发明人： Tsuyoshi Takahashi ,  Toshiki Kimura

IPC分类号： G11B5/09 ,  G11B5/00 ,  G11B5/012 ,  G11B5/035 ,  G11B5/39 ,  G11B20/10 ,  G11B20/14 ,  G11B20/18 ,  G11B5/03

CPC分类号： G11B20/10481 ,  G11B20/10009 ,  G11B20/10055 ,  G11B20/10296 ,  G11B5/012 ,  G11B5/035 ,  G11B20/1426 ,  G11B2005/0013 ,  G11B2005/0018

摘要： An automatic calibration method for a read system in which data read by a head from a recording medium is demodulated using a partial response method which includes the steps of: storing at least one of a parameter relating to a bias current fed to the head and parameters necessary for data demodulation in the read system, for a plurality of operating conditions; and automatically calibrating the at least one parameter to a preset value suitable for an operating condition.

摘要翻译： 一种用于读取系统的自动校准方法，其中使用部分响应方法来解调来自记录介质的头部的数据，其包括以下步骤：存储与馈送到头部的偏置电流有关的参数和参数 对于多个操作条件，在读取系统中进行数据解调所必需的; 并且将所述至少一个参数自动校准到适合于操作条件的预设值。

公开(公告)号：US5926337A

公开(公告)日：1999-07-20

申请号：US824658

申请日：1997-03-24

申请人： Kenji Itou ,  Isamu Tomita ,  Toshiki Kimura

发明人： Kenji Itou ,  Isamu Tomita ,  Toshiki Kimura

IPC分类号： G11B21/10 ,  G11B5/55 ,  G11B5/596

CPC分类号： G11B5/59627 ,  G11B5/5534

摘要： Disclosed is an off-track correcting method for a disk apparatus for measuring an off-track correction value by use of servo data on a data surface. The data surface on a disk medium is recorded with servo data for an off-track measurement. The data head seals a cylinder position recorded with the off-track measurement servo data. It is determined whether or not this cylinder position is a sensitivity abnormal position of the cylinder. The data head reads a first item of servo data after offset-moving the data head by a predetermined quantity on inner and outer sides of the disk medium, corresponding to detecting that the data head is located in the sensitivity abnormal position. An off-track correction value in the cylinder position is calculated from the plural pieces of first servo data read finally in a plurality of reading positions. This, even when enhancing a track density, the precise off-track correction value can be thereby measured.

摘要翻译： 公开了一种用于通过使用数据表面上的伺服数据来测量偏离轨道校正值的盘装置的偏离轨道校正方法。 用磁带测量的伺服数据记录磁盘介质上的数据表面。 数据头密封记录有离轨测量伺服数据的气缸位置。 确定该气缸位置是否是气缸的灵敏度异常位置。 在检测到数据头位于灵敏度异常位置中时，数据头在磁盘介质的内侧和外侧偏移 - 移动数据头之后读取第一项伺服数据。 从多个读取位置中最终读取的多条第一伺服数据计算出气缸位置的偏离轨迹校正值。 这样，即使提高轨道密度，也可以测定精确的越野校正值。

公开(公告)号：US5790333A

公开(公告)日：1998-08-04

申请号：US593822

申请日：1996-01-30

申请人： Toshiki Kimura ,  Masayoshi Ishii

发明人： Toshiki Kimura ,  Masayoshi Ishii

IPC分类号： G11B21/10 ,  G11B5/012 ,  G11B5/48 ,  G11B5/56 ,  G11B5/596 ,  G11B19/04 ,  G11B20/18 ,  G11B27/36

CPC分类号： G11B5/4886 ,  G11B19/04 ,  G11B20/1816 ,  G11B27/36 ,  G11B5/012 ,  G11B5/59627 ,  G11B5/56

摘要： A method for optimizing a write offset margin includes the steps of writing test data on a recording medium along a track defined thereon by a head, reading the test data from the recording medium by the head while changing an offset of the head with respect to the track, determining a maximum offset that provides agreement between the test data written into the recording medium along the track by the head and the test data read out from the recording medium by the head along the track, and setting a write offset margin for the magnetic disk based upon the maximum offset.

摘要翻译： 用于优化写入偏移余量的方法包括以下步骤：将记录介质沿着由其定义在其上的磁道写入记录介质，从头读取测试数据，同时改变磁头相对于磁头的偏移量 确定最大偏移，其提供沿着磁道沿轨迹写入记录介质的测试数据和由记录介质从记录介质读出的测试数据之间的一致性，并且设置磁道的写入偏移量 基于最大偏移量的磁盘。

公开(公告)号：USD705266S1

公开(公告)日：2014-05-20

申请号：US29408917

申请日：2011-12-19

申请人： Masao Yoshikawa ,  Toshiki Kimura

设计人： Masao Yoshikawa ,  Toshiki Kimura