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1. 发明授权

US06826003B1 Disk drive comprising a pattern dependent overshoot circuit for controlling write current overshoot 有权
标题翻译：磁盘驱动器包括用于控制写入电流过冲的与图案相关的过冲电路
公开(公告)号：US06826003B1
公开(公告)日：2004-11-30
申请号：US10062963
申请日：2002-01-31
申请人： Jai N. Subrahmanyam
发明人： Jai N. Subrahmanyam
IPC分类号： G11B502
CPC分类号： G11B5/09
摘要： A disk drive is disclosed comprising a disk and a head actuated radially over the disk. A pattern detector detects a predetermined pattern in write data to be written to the disk, and in response, adjusts a write current overshoot in a write current applied to the head.
摘要翻译：公开了一种磁盘驱动器，包括盘和在盘上径向地致动的磁头。图案检测器检测要写入盘的写入数据中的预定图案，并且作为响应，调整施加到头部的写入电流中的写入电流过冲。

2. 发明授权

US06813110B2 Disk drive writer with capacitive boost 有权
标题翻译：带驱动器的磁盘驱动器
公开(公告)号：US06813110B2
公开(公告)日：2004-11-02
申请号：US10219948
申请日：2002-08-15
申请人： John D. Leighton , Scott M. O'Brien , Robert J. Wimmer , Nameeta Krenz , Carl F. Elliott , Michael J. O'Brien , Cameron C. Rabe
发明人： John D. Leighton , Scott M. O'Brien , Robert J. Wimmer , Nameeta Krenz , Carl F. Elliott , Michael J. O'Brien , Cameron C. Rabe
IPC分类号： G11B502
CPC分类号： G11B5/022 , G11B5/012 , G11B5/02
摘要： A write driver circuit selectively provides write current through a write head in first and second opposite directions. First and second active devices are driven with first and second pre-drive signals. Third and fourth active devices are driven with third and fourth pre-drive signals. First and second pull-up resistances are provided respectively between the first and second active devices and a fixed voltage, and third and fourth pull-up resistances are provided respectively between the third and fourth active devices and the fixed voltage. A first capacitor is connected between the first active device and an intermediate point of the third pull-up resistance, and a second capacitor is connected between the second active device and an intermediate point of the fourth pull-up resistance.
摘要翻译：写入驱动器电路在第一和第二相反方向上选择性地提供写入电流通过写入头。第一和第二有源器件由第一和第二预驱动信号驱动。第三和第四有源器件由第三和第四预驱动信号驱动。分别在第一和第二有源器件之间提供第一和第二上拉电阻和固定电压，并且在第三和第四有源器件之间分别提供第三和第四上拉电阻和固定电压。第一电容器连接在第一有源器件和第三上拉电阻的中间点之间，第二电容器连接在第二有源器件与第四上拉电阻的中间点之间。

3. 发明授权

US06804071B2 Digital recording apparatus non-influenced by recording data rate and low frequency cut-off, and enhancing high frequency components of data being recorded 失效
标题翻译：数字记录装置不受记录数据速率和低频截止影响，并增强正在记录的数据的高频分量
公开(公告)号：US06804071B2
公开(公告)日：2004-10-12
申请号：US09913246
申请日：2002-02-11
申请人： Mamoru Mizukami , Kaoru Urata
发明人： Mamoru Mizukami , Kaoru Urata
IPC分类号： G11B502
CPC分类号： G11B20/1403 , G11B5/0086 , G11B5/09
摘要： Digital data recording apparatus includes a modulator for modulating a recording clock by a recording data. A reference voltage and a reference current in signal processing are set based on a reference clock having a multiple cycle of the cycle of the recording clock when the reference clock is supplied via a rotary transformer. A demodulator demodulates a modulation signal supplied via the rotary transformer to produce a demodulation signal, from which a recording signal is generated for recording on a recording medium. The demodulator obtains a modulation signal and an inverted modulation signal from which first and second saw-tooth wave signals are produced when the reference current is supplied. A mixer mixes the first and second saw-tooth wave signals, and the demodulation signal is obtained, based on the mixer output and the reference voltage.
摘要翻译：数字数据记录装置包括用于通过记录数据调制记录时钟的调制器。在通过旋转变压器供给基准时钟时，基于具有记录时钟的周期的多个周期的基准时钟来设定信号处理中的基准电压和基准电流。解调器解调通过旋转变压器提供的调制信号，以产生解调信号，从而从该信号产生用于记录在记录介质上的记录信号。解调器获得当提供参考电流时产生第一和第二锯齿波信号的调制信号和反相调制信号。混合器混合第一和第二锯齿波信号，并且基于混频器输出和参考电压获得解调信号。

4. 发明授权

US06778347B2 Load balancing circuit for a dual polarity power supply with single polarity voltage regulation 有权
标题翻译：用于双极性电源的负载平衡电路，具有单极性电压调节
公开(公告)号：US06778347B2
公开(公告)日：2004-08-17
申请号：US09904721
申请日：2001-07-13
申请人： Donald W. Janz
发明人： Donald W. Janz
IPC分类号： G11B502
CPC分类号： H02M3/155 , H02M2001/009
摘要： A load balancing circuit which operates to balance the output voltages of a dual polarity power supply with single polarity voltage regulation. The power supply outputs a positive voltage at a positive voltage with respect to a reference level and a negative voltage with respect to the reference level. The power supply further applies voltage regulation to a selected one of the positive and negative voltages and leaves the remaining one of the positive and negative voltages in an unregulated state. Positive and negative loads are coupled to receive the positive and negative voltages. The load balancing circuit detects a change in impedance of a selected one of the positive and negative loads and applies a corresponding impedance to the power supply to maintain the power supply in a nominally balanced state.
摘要翻译：负载平衡电路，用于平衡双极性电源的输出电压与单极性电压调节。电源以相对于参考电平的正电压和相对于参考电平的负电压输出正电压。电源进一步对正电压和负电压中的一个施加电压调节，并将正电压和负电压中的剩余电压留在未调节状态。正和负负载耦合以接收正电压和负电压。负载平衡电路检测正负载中所选择的一个的阻抗的变化，并向电源施加相应的阻抗以将电源维持在标称平衡状态。

5. 发明授权

US06744583B2 Method for forming a magnetic pattern in a magnetic recording medium, a magnetic pattern forming device, a magnetic recording medium and a magnetic recording device 失效
标题翻译：在磁记录介质中形成磁图案的方法，磁图形形成装置，磁记录介质和磁记录装置
公开(公告)号：US06744583B2
公开(公告)日：2004-06-01
申请号：US10212688
申请日：2002-08-07
申请人： Hiroyuki Ikeda , Yuzo Seo , Youji Arita
发明人： Hiroyuki Ikeda , Yuzo Seo , Youji Arita
IPC分类号： G11B502
CPC分类号： B82Y10/00 , G11B5/59633 , G11B5/743 , G11B5/82 , G11B5/855 , G11B5/865 , G11B13/045 , G11B2005/0021
摘要： A method for forming a magnetic pattern by applying a first external magnetic field to a magnetic recording medium having a magnetic layer to magnetize uniformly the magnetic layer in a predetermined direction and heating locally the magnetic layer while a second external magnetic field is applied thereto, whereby the heated portion is magnetized in the direction opposite to the predetermined direction, wherein the second external magnetic field has a pulse-like magnetic field component. The method can form a fine magnetic pattern efficiently in a medium for high density recording, and a magnetic recording medium and a magnetic recording device capable of recording with high density can be provided economically in a short time.
摘要翻译：通过对具有磁性层的磁记录介质施加第一外部磁场以在预定方向上均匀地磁化磁性层并且在施加第二外部磁场的同时对磁性层进行加热而形成磁性图案的方法，由此加热部分沿与预定方向相反的方向被磁化，其中第二外部磁场具有脉冲状磁场分量。该方法可以在用于高密度记录的介质中有效地形成精细磁图案，并且磁记录能够在短时间内经济地提供能够高密度记录的磁记录装置。

6. 发明授权

US06735031B2 Method for storage of self-servowriting timing information 失效
标题翻译：存储自伺服定时信息的方法
公开(公告)号：US06735031B2
公开(公告)日：2004-05-11
申请号：US09774914
申请日：2001-01-31
申请人： Timothy J. Chainer , Mark D. Schultz , Bucknell C. Webb , Edward J. Yarmchuk
发明人： Timothy J. Chainer , Mark D. Schultz , Bucknell C. Webb , Edward J. Yarmchuk
IPC分类号： G11B502
CPC分类号： G11B5/59633 , G11B5/012
摘要： A method for writing timing marks on a rotatable storage medium, such as on a disk in a disk drive, includes the steps of: 1) during a rotation of the disk, detecting the passage of at least a portion of a first timing mark located at a first radius of the disk, and 2) writing a second timing mark at a second radius of the disk, the location of the second timing mark being based at least in part on a stored calculation of a delay from the time of passage of the first timing mark during a rotation of the rotatable storage medium. The location of the second timing mark is calculated based on alternative time intervals between detected timing marks and on various functions of the time intervals.
摘要翻译：在诸如盘驱动器中的盘上的可旋转存储介质上写入定时标记的方法包括以下步骤：1）在盘的旋转期间，检测位于第一定时标记的至少一部分的通过在所述盘的第一半径处，以及2）在所述盘的第二半径处写入第二定时标记，所述第二定时标记的位置至少部分地基于存储的从所述盘的通过时间开始的延迟的计算在可旋转存储介质旋转期间的第一定时标记。基于检测到的定时标记之间的替代时间间隔和时间间隔的各种功能来计算第二定时标记的位置。

7. 发明授权

US06707628B2 Head suspension assembly mounting nonvolatile memory and magnetic disk device 失效
标题翻译：头悬挂组件安装非易失性存储器和磁盘设备
公开(公告)号：US06707628B2
公开(公告)日：2004-03-16
申请号：US09785283
申请日：2001-02-20
申请人： Akira Osaki
发明人： Akira Osaki
IPC分类号： G11B502
CPC分类号： G11B5/4853 , G11B5/012 , G11B5/486 , G11B2005/0013
摘要： A head suspension assembly 4 has an arm 17 supported so as to rotate, an elastically flexible suspension 16 having one end which is fixed to an end of the arm and the other end has a magnetic head 2 mounted thereon, and a signal transmission line 18 fixed on the suspension and the arm which connects the magnetic head with a main FPC. A head amplifier 8, which transmits and receives signals to and from the magnetic head, and a nonvolatile memory 9, which stores optimized control parameters of the magnetic head and the head amplifier, are mounted together on the head suspension assembly; and, the head amplifier and the nonvolatile memory are electrically connected to the signal transmission
摘要翻译：头悬挂组件4具有被支撑为旋转的臂17，弹性柔性悬架16具有一端固定到臂的一端，另一端具有安装在其上的磁头2，信号传输线18 固定在悬架上和将磁头与主FPC连接的臂。向磁头发送信号和从磁头接收信号的头放大器8和存储磁头和头放大器的优化控制参数的非易失性存储器9一起安装在磁头悬架组件上; 并且，头放大器和非易失性存储器电连接到信号传输

8. 发明授权

US06680640B1 High linearity large bandwidth, switch insensitive, programmable gain attenuator 失效
标题翻译：高线性度带宽大，开关不灵敏，可编程增益衰减器
公开(公告)号：US06680640B1
公开(公告)日：2004-01-20
申请号：US09712415
申请日：2000-11-13
申请人： Arya Reza Behzad
发明人： Arya Reza Behzad
IPC分类号： G11B502
CPC分类号： H03G1/0088 , H03G3/001 , H03G3/3036
摘要： An apparatus for providing a programmable gain attenuator (PGA) while minimizing the influence of semiconductor switches on the signal being attenuated. An example apparatus comprises a impedance ladder with taps forming the junctions between impedances the PGA is then programmed by grounding the taps through terminating resistors.
摘要翻译：一种用于提供可编程增益衰减器（PGA）的设备，同时最小化半导体开关对被衰减的信号的影响。示例性装置包括阻抗梯形图，其中抽头形成阻抗之间的接合点，然后通过终止电阻器将抽头接地来编程PGA。

9. 发明授权

US06633447B2 Method and apparatus for compensation of second order distortion 有权
标题翻译：补偿二阶失真的方法和装置
公开(公告)号：US06633447B2
公开(公告)日：2003-10-14
申请号：US09865790
申请日：2001-05-25
申请人： Stephen J. Franck , Thomas Blon
发明人： Stephen J. Franck , Thomas Blon
IPC分类号： G11B502
CPC分类号： H03F3/45197 , G11B5/012 , G11B5/02 , G11B20/10009 , G11B20/22 , G11B2005/0016 , H03F1/3211 , H03F1/3241 , H03F2203/45492
摘要： A method and apparatus for removing second order distortion is disclosed. The method couples a differential load between two source followers of a gain stage. The apparatus includes a differential load having two MOS transistors of unequal channel width/length ratios. The differential load implements a square and summing function in a single circuit eliminating the need to split the signal path.
摘要翻译：公开了一种用于去除二阶失真的方法和装置。该方法在增益级的两个源跟随器之间耦合差分负载。该装置包括具有不等通道宽度/长度比的两个MOS晶体管的差分负载。差分负载在单个电路中实现平方和求和功能，无需拆分信号路径。

10. 发明授权

US06621649B1 Write-to-read switching improvement for differential preamplifier circuits in hard disk drive systems 有权
标题翻译：硬盘驱动器系统中差分前置放大器电路的读写开关改进
公开(公告)号：US06621649B1
公开(公告)日：2003-09-16
申请号：US09709699
申请日：2000-11-10
申请人： Hong Jiang , Indumini Ranmuthu
发明人： Hong Jiang , Indumini Ranmuthu
IPC分类号： G11B502
CPC分类号： G11B5/012 , G11B5/59622 , G11B19/04
摘要： The present invention relates to a preamplifier circuit comprising a plurality of amplifier stages coupled together and operable to consecutively amplify a signal associated with a head of a hard disk drive. The preamplifier circuit further comprises a power delivery circuit operably coupled to the amplifier stages and operable to provide power to the amplifier stages in a substantially concurrent manner when the hard disk drive is transitioning from a write state to a read state. In addition, the circuit comprises a control circuit operably coupled to the amplifier stages, and operable to activate at least two of the plurality of amplifier stages in a generally consecutive manner after the providing of power to the amplifier stages. In the above manner a saturation of an output of the preamplifier circuit is avoided by preventing substantially a propagation of glitches through the preamplifier circuit and providing for a substantially fast write-to-read transition time.
摘要翻译：本发明涉及一种前置放大器电路，其包括耦合在一起的多个放大器级并且可操作以连续放大与硬盘驱动器的头部相关联的信号。前置放大器电路还包括功率传输电路，其可操作地耦合到放大器级，并且可操作以在硬盘驱动器从写入状态转换到读取状态时以大致并发的方式向放大器级提供电力。此外，电路包括可操作地耦合到放大器级的控制电路，并且可操作以在向放大器级提供电力之后以大致连续的方式激活多个放大器级中的至少两个。以上述方式，通过防止毛刺大量传播通过前置放大器电路并提供基本上快速的写入 - 读取转换时间来避免前置放大器电路的输出的饱和。

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