公开(公告)号：US20090154002A1

公开(公告)日：2009-06-18

申请号：US12146934

申请日：2008-06-26

Applicant: Toru Takeuchi ,  Motomu Hashizume ,  Hiroyuki Mukai

Inventor： Toru Takeuchi ,  Motomu Hashizume ,  Hiroyuki Mukai

IPC: G11B21/02

CPC classification number: G11B5/40 ,  G11B5/455 ,  G11B5/6064 ,  G11B5/607

Abstract: Methods and apparatus to control head expansion in multi-head hard-disk drives are disclosed. An example control system for use in a multi-head hard-disk drive includes a first sensor to provide a first feedback signal indicating a status of a first head; a second sensor to provide a second feedback signal indicating a status of a second head; and a shared calculation unit to selectively receive one of the first and second feedback signals for a feedback process to control an expansion of the first and second heads.

Abstract translation: 公开了用于控制多头硬盘驱动器中的磁头扩展的方法和装置。 用于多头硬盘驱动器的示例性控制系统包括：第一传感器，用于提供指示第一头部状态的第一反馈信号; 第二传感器，用于提供指示第二头的状态的第二反馈信号; 以及共享计算单元，用于选择性地接收所述第一和第二反馈信号之一用于反馈处理，以控制所述第一和第二磁头的扩展。

公开(公告)号：US20090034112A1

公开(公告)日：2009-02-05

申请号：US11831750

申请日：2007-07-31

Applicant: Motomu Hashizume

Inventor： Motomu Hashizume

IPC: G11B5/02

CPC classification number: G11B5/02 ,  G11B20/10009 ,  G11B20/10027 ,  G11B2005/0018 ,  G11B2220/2516

Abstract: Methods and apparatus to vary the input impedance of a hard disk read preamplifier are disclosed. A disclosed method amplifies a read signal from a hard disk read head based on the impedance presented by the read head and changes the impedance presented to the read head based on the gain factor.

Abstract translation: 公开了改变硬盘读前置放大器的输入阻抗的方法和装置。 所公开的方法基于由读取头呈现的阻抗，从硬盘读取头放大读取信号，并且基于增益因子改变呈现给读取头的阻抗。

公开(公告)号：US20080278859A1

公开(公告)日：2008-11-13

申请号：US11747681

申请日：2007-05-11

Applicant: Naoko Takemoto ,  Motomu Hashizume

Inventor： Naoko Takemoto ,  Motomu Hashizume

IPC: G11B5/33

CPC classification number: G11B5/59683 ,  G11B5/02 ,  G11B2005/0008

Abstract: Resistivity sense bias circuits are described herein. An example resistivity sense bias circuit for use with a magnetoresistive read head includes a current biasing portion configured to provide a bias current across the magnetoresistive read head thereby establishing a bias voltage across the magnetoresistive read head, a resistivity sensing portion coupled to the current biasing portion and configured to sense a change in the bias current based on a resistivity change of the magnetoresistive read head, and a voltage source to provide the bias voltage and to adjust the bias voltage in response to the resistivity change of the magnetoresistive read head.

Abstract translation: 本文描述了电阻率检测偏置电路。 用于磁阻读取头的示例电阻率检测偏置电路包括电流偏置部分，其被配置为在磁阻读取头两端提供偏置电流，从而在磁阻读取头两端建立偏置电压，耦合到电流偏置部分的电阻率检测部分 并且被配置为基于磁阻读取头的电阻率变化和电压源来感测偏置电流的变化，以提供偏置电压并且响应于磁阻读取头的电阻率变化来调整偏置电压。

公开(公告)号：US20080204922A1

公开(公告)日：2008-08-28

申请号：US11712049

申请日：2007-02-28

Applicant: Motomu Hashizume ,  Hiroyuki Mukai ,  Yukihisa Hirotsugu ,  Hidetaka Kuroiwa ,  Naoko Jinguji

Inventor： Motomu Hashizume ,  Hiroyuki Mukai ,  Yukihisa Hirotsugu ,  Hidetaka Kuroiwa ,  Naoko Jinguji

IPC: G11B21/02

CPC classification number: G11B5/6029 ,  G11B5/40 ,  G11B5/6005

Abstract: Methods and apparatus to monitor hard-disk drive head position are described. In one example, a hard-disk drive system includes a hard-disk drive platter, a hard-disk drive read head configured to read information from the hard-disk drive platter, and a hard-disk drive head position detector configured to a receive a signal via the hard-disk drive read head and to determine if oscillations in the distance between the hard-disk drive platter and the hard-disk drive read head indicate that contact between the hard-disk drive platter and the hard-disk drive read head is likely to occur

Abstract translation: 描述了监视硬盘驱动器头位置的方法和装置。 在一个示例中，硬盘驱动器系统包括硬盘驱动器盘，被配置为从硬盘驱动器盘读取信息的硬盘驱动器读取头和配置为接收的硬盘驱动器头位置检测器 通过硬盘驱动器读取头的信号，并确定硬盘驱动器盘和硬盘驱动器读取头之间的距离是否振荡，表示硬盘驱动器盘与硬盘驱动器之间的接触读取 头很可能发生

公开(公告)号：US07362530B2

公开(公告)日：2008-04-22

申请号：US10982624

申请日：2004-11-06

Applicant: Motomu Hashizume

Inventor： Motomu Hashizume

IPC: G11B5/02

CPC classification number: G11B5/02 ,  G11B2005/0018 ,  H03F3/45085 ,  H03F2203/45318

Abstract: An amplifier apparatus for use with a sensor includes: (a) a first and a second amplifying circuit segment coupled with the sensor and cooperating to effect substantially balanced handling of signals received from the sensor; the first amplifying circuit segment includes a first transistor device; the second amplifying circuit segment includes a second transistor device; (b) a countercurrent unit coupled with the first and second amplifying circuit segments for receiving a first indicator signal from the first transistor device and a second indicator signal from the second transistor device; the first indicator signal represents a first parameter in the first transistor device; the second indicator signal represents a second parameter in the second transistor device; the countercurrent unit provides feedback signals to at least one of the first transistor and second transistor devices to reduce input impedance of the apparatus.

Abstract translation: 一种与传感器一起使用的放大器装置包括：（a）第一和第二放大电路段，与传感器耦合，并协调对来自传感器的信号进行实质上平衡的处理; 第一放大电路段包括第一晶体管器件; 第二放大电路段包括第二晶体管器件; （b）与第一和第二放大电路段耦合的逆流单元，用于接收来自第一晶体管器件的第一指示信号和来自第二晶体管器件的第二指示信号; 第一指示符信号表示第一晶体管器件中的第一参数; 第二指示符信号表示第二晶体管器件中的第二参数; 逆流单元向第一晶体管和第二晶体管器件中的至少一个提供反馈信号，以减少设备的输入阻抗。

公开(公告)号：US07715136B2

公开(公告)日：2010-05-11

申请号：US11733027

申请日：2007-04-09

Applicant: Motomu Hashizume

Inventor： Motomu Hashizume

IPC: G11B5/09

CPC classification number: G11B5/09

Abstract: A disk drive controller including a preamplifier and a controller is disclosed, in which communications between the controller and the preamplifier are carried out over at least some shared terminals and conductors. A first pair of differential lines is provided to communicate data, sensed at read/write heads of the disk drive, from the preamplifier to the controller, and a second pair of differential lines communicates data to be written to the disk drive from the controller to the preamplifier. Control signals are communicated over a serial interface between the controller and preamplifier, over the first pair of differential lines, so that serial communication can be carried out simultaneously with the writing of data from the controller to the preamplifier. Alternatively, the control signals are communicated over the second pair of differential lines, simultaneously with the reading of data from the preamplifier to the controller.

Abstract translation: 公开了一种包括前置放大器和控制器的磁盘驱动器控制器，其中控制器和前置放大器之间的通信在至少一些共享终端和导体上进行。 提供第一对差分线以将从磁盘驱动器的读/写头感测的数据从前置放大器传送到控制器，并且第二对差分线将要写入磁盘驱动器的数据从控制器传送到 前置放大器。 控制信号通过控制器和前置放大器之间的串行接口通过第一对差分线路进行通信，从而可以在将数据从控制器写入前置放大器的同时进行串行通信。 或者，在将数据从前置放大器读取到控制器的同时，通过第二对差分线路传送控制信号。

公开(公告)号：US07639442B2

公开(公告)日：2009-12-29

申请号：US11848849

申请日：2007-08-31

Applicant: Motomu Hashizume ,  Hiroyuki Mukai ,  Naoko Jinguji ,  Toru Takeuchi

Inventor： Motomu Hashizume ,  Hiroyuki Mukai ,  Naoko Jinguji ,  Toru Takeuchi

IPC: G11B27/36

CPC classification number: G11B5/56

Abstract: Methods and apparatus to perform hard-disk drive head proximity detection in a preamplifier are described. One example method of detecting head position in a hard-disk drive includes obtaining a read signal from a head reading information from a disk; determining a signal envelope of the read signal; comparing the signal envelope to a first threshold to produce a first comparison; filtering the signal envelope; comparing the filtered signal envelope to a second threshold to produce a second comparison; combining the first comparison and the second comparison; and determining if the combination of the first comparison and the second comparison indicates head position oscillation.

Abstract translation: 描述了在前置放大器中执行硬盘驱动器头部邻近检测的方法和装置。 检测硬盘驱动器中的磁头位置的一种示例性方法包括从磁头读取信息获得读取信号; 确定读信号的信号包络; 将信号包络与第一阈值进行比较以产生第一比较; 过滤信号包络; 将经滤波的信号包络与第二阈值进行比较以产生第二比较; 结合第一次比较和第二次比较; 以及确定第一比较和第二比较的组合是否指示头位置振荡。

公开(公告)号：US20070236819A1

公开(公告)日：2007-10-11

申请号：US11733027

申请日：2007-04-09

Applicant: Motomu Hashizume

Inventor： Motomu Hashizume

IPC: G11B5/02 ,  G11B5/09

CPC classification number: G11B5/09

Abstract: A disk drive controller including a preamplifier and a controller is disclosed, in which communications between the controller and the preamplifier are carried out over at least some shared terminals and conductors. A first pair of differential lines is provided to communicate data, sensed at read/write heads of the disk drive, from the preamplifier to the controller, and a second pair of differential lines communicates data to be written to the disk drive from the controller to the preamplifier. Control signals are communicated over a serial interface between the controller and preamplifier, over the first pair of differential lines, so that serial communication can be carried out simultaneously with the writing of data from the controller to the preamplifier. Alternatively, the control signals are communicated over the second pair of differential lines, simultaneously with the reading of data from the preamplifier to the controller.

Abstract translation: 公开了一种包括前置放大器和控制器的磁盘驱动器控制器，其中控制器和前置放大器之间的通信在至少一些共享终端和导体上进行。 提供第一对差分线以将从磁盘驱动器的读/写头感测的数据从前置放大器传送到控制器，并且第二对差分线将要写入磁盘驱动器的数据从控制器传送到 前置放大器。 控制信号通过控制器和前置放大器之间的串行接口通过第一对差分线路进行通信，从而可以在将数据从控制器写入前置放大器的同时进行串行通信。 或者，在将数据从前置放大器读取到控制器的同时，通过第二对差分线路传送控制信号。

公开(公告)号：US20070153413A1

公开(公告)日：2007-07-05

申请号：US11323790

申请日：2005-12-30

Applicant: Hiromichi Kuwano ,  Motomu Hashizume ,  Naoko Jinguji

Inventor： Hiromichi Kuwano ,  Motomu Hashizume ,  Naoko Jinguji

IPC: G11B21/02

CPC classification number: G11B5/455

Abstract: A system and method of the companion chip monitoring the active head chip over the conventional 4 wire structure, including when the active head chip goes into a sleep state. Advantageously, the companion chip remains operational and detects changes of the voltage on the DX and DY line, even when the active head chip determines a fault and goes into a sleep state. Further, the companion chip can determine which fault was detected by the active head chip using a read back function, such as analyzing an internal register of the active head chip.

Abstract translation: 包括当有源头芯片进入睡眠状态时，伴随芯片监视有源头芯片的系统和方法。 有利地，伴随的芯片保持运行，并且检测DX和DY线路上的电压的变化，即使当有源头部芯片确定故障并进入睡眠状态时。 此外，伴随芯片可以使用回读功能来确定主动头芯片检测到哪个故障，例如分析有源头芯片的内部寄存器。

公开(公告)号：US07961418B2

公开(公告)日：2011-06-14

申请号：US11747681

申请日：2007-05-11

Applicant: Naoko Takemoto ,  Motomu Hashizume

Inventor： Naoko Takemoto ,  Motomu Hashizume

IPC: G11B5/03

CPC classification number: G11B5/59683 ,  G11B5/02 ,  G11B2005/0008

Abstract: Resistivity sense bias circuits are described herein. An example resistivity sense bias circuit for use with a magnetoresistive read head includes a current biasing portion configured to provide a bias current across the magnetoresistive read head thereby establishing a bias voltage across the magnetoresistive read head, a resistivity sensing portion coupled to the current biasing portion and configured to sense a change in the bias current based on a resistivity change of the magnetoresistive read head, and a voltage source to provide the bias voltage and to adjust the bias voltage in response to the resistivity change of the magnetoresistive read head.

Abstract translation: 本文描述了电阻率检测偏置电路。 用于磁阻读取头的示例电阻率检测偏置电路包括电流偏置部分，其被配置为在磁阻读取头两端提供偏置电流，从而在磁阻读取头两端建立偏置电压，耦合到电流偏置部分的电阻率检测部分 并且被配置为基于磁阻读取头的电阻率变化和电压源来感测偏置电流的变化，以提供偏置电压并且响应于磁阻读取头的电阻率变化来调整偏置电压。