公开(公告)号：US08842504B2

公开(公告)日：2014-09-23

申请号：US12668076

申请日：2008-07-10

Applicant: Masakazu Hirata ,  Manabu Oumi ,  Majung Park

Inventor： Masakazu Hirata ,  Manabu Oumi ,  Majung Park

IPC: G11B5/02 ,  G11B5/60 ,  G11B5/48 ,  G11B5/31 ,  G11B5/00

CPC classification number: G11B5/314 ,  G11B5/02 ,  G11B5/4866 ,  G11B5/6088 ,  G11B2005/001 ,  G11B2005/0021

Abstract: A near-field light head of the present invention includes: a slider disposed opposite to a surface of the magnetic recording medium; a recording element that includes a main magnetic pole generating the recording magnetic field and a subsidiary magnetic pole, the recording element being fixed to an apical surface of the slider so that the main magnetic pole and the subsidiary magnetic pole line up in a longitudinal direction of the slider in the state where the subsidiary magnetic pole is located at the apical surface of the slider; a near-field light generating element, fixed adjacently to the main magnetic pole in a state where another end side thereof is directed to the magnetic recording medium, that propagates the light flux introduced from one end side thereof toward the other end side to generate the near-field light, and radiates the near-field light from the other end side to the outside; and a light flux introducing device, fixed to the slider, that introduces the light flux from the one end side into the near-field light generating element. The near-field light generating element includes an inclined surface, which is inclined with respect to an optical axis of the light flux propagated through the inside thereof and is opposite to the main magnetic pole, in the other end side. A metallic film that increases light intensity of the near-field light to be increased is formed in the inclined surface.

Abstract translation: 本发明的近场光头包括：与磁记录介质的表面相对设置的滑块; 记录元件，其包括产生记录磁场的主磁极和辅助磁极，所述记录元件固定到所述滑块的顶面，使得所述主磁极和所述辅助磁极线在纵向方向上向上 所述滑块在所述辅助磁极位于所述滑块的顶面的状态下; 近场光产生元件，其在另一端侧被引导到磁记录介质的状态下相对于主磁极固定，将从其一端侧引入的光束向另一端侧传播，以产生 近场光，并将来自另一端侧的近场光辐射到外部; 以及固定到滑块的光束引入装置，其将来自一端侧的光通量引入近场光产生元件。 近场光产生元件包括在另一端侧相对于在其内部传播并与主磁极相对的光束的光轴倾斜的倾斜表面。 在倾斜表面中形成增加增加的近场光的光强度的金属膜。

公开(公告)号：US08824077B2

公开(公告)日：2014-09-02

申请号：US13306552

申请日：2011-11-29

Applicant: John Thomas Contreras ,  Samir Y. Garzon ,  David John Seagle

Inventor： John Thomas Contreras ,  Samir Y. Garzon ,  David John Seagle

IPC: G11B5/09

CPC classification number: G11B5/02 ,  G11B5/17 ,  G11B5/3123 ,  G11B5/3133

Abstract: Write enhancement circuitry on the head carrier of a magnetic recording disk drive provides additional write current overshoot beyond that provided by the write driver circuitry. The write enhancement circuitry is formed on the head carrier as ladder network blocks. A first ladder network block is a first capacitor C1 located in parallel with the write coil. The second ladder network block includes a second capacitor C2 having substantially the same inductance L2. The compensation circuitry is referred to as a ladder network because additional ladder blocks, like the second block but with different values of capacitance and inductance, may be located on the head carrier.

Abstract translation: 在磁记录磁盘驱动器的磁头载体上的写增强电路提供超出写驱动器电路提供的额外的写电流过冲。 写增强电路在梯形网络块上形成在磁头载体上。 第一梯形网络块是与写入线圈并联设置的第一电容器C1。 第二梯形网络块包括具有基本上相同的电感L2的第二电容器C2。 补偿电路被称为梯形网络，因为附加的梯形块（如第二块但具有不同的电容和电感值）可能位于磁头架上。

公开(公告)号：US20140226237A1

公开(公告)日：2014-08-14

申请号：US14260172

申请日：2014-04-23

Applicant: HGST Netherlands B.V.

Inventor： Yukimasa Okada ,  Katsumi Hoshino ,  Kouji Kataoka ,  Takashi Wagatsuma

IPC: G11B20/18

CPC classification number: G11B20/18 ,  G11B5/02 ,  G11B5/607 ,  G11B21/12 ,  G11B21/22 ,  G11B2220/2516

Abstract: In one embodiment, a magnetic disk device includes a magnetic disk medium, at least one magnetic head having at least one of: a magnetic read element configured to read data from the magnetic disk medium and a magnetic write element configured to write data to the magnetic disk medium, and a heating element configured to generate heat upon application of a voltage/current thereto, wherein the heating element is positioned on, near, or within the magnetic head, a drive mechanism for passing the magnetic disk medium over the at least one magnetic head, and a controller electrically coupled to the at least one magnetic head for controlling operation of the at least one magnetic head, wherein the controller is configured to retract the at least one magnetic head from a flying state above the magnetic disk medium and apply the voltage/current to the heating element while the magnetic head is retracted.

Abstract translation: 在一个实施例中，磁盘装置包括磁盘介质，至少一个磁头，其具有以下至少一个：磁读取元件，被配置为从磁盘介质读取数据;磁写入元件，被配置为将数据写入磁 磁盘介质和被配置为在施加电压/电流时产生热量的加热元件，其中所述加热元件位于所述磁头的附近或内部，驱动机构，用于使所述磁盘介质通过所述至少一个 磁头以及与所述至少一个磁头电耦合以控制所述至少一个磁头的操作的控制器，其中所述控制器被配置为将所述至少一个磁头从所述磁盘介质上方的飞行状态缩回并应用 在磁头收回时到加热元件的电压/电流。

公开(公告)号：US20140226234A1

公开(公告)日：2014-08-14

申请号：US13771882

申请日：2013-02-20

Applicant: LSI CORPORATION

Inventor： Boris Livshitz ,  Anamul Hoque ,  Jason Goldberg

IPC: G11B5/02

CPC classification number: G11B5/012 ,  G11B5/02 ,  G11B5/09

Abstract: Aspects of the disclosure pertain to a system and method for providing controllable steady state current waveshaping in a preamplifier of a data storage system (e.g., hard disk drive). The preamplifier provides an output including a write current waveform having a steady state current level that is controllable via the write block circuitry of the preamplifier. This enhances the ability of the waveform to promote improved on-track and off-track write performance.

Abstract translation: 本公开的方面涉及用于在数据存储系统（例如，硬盘驱动器）的前置放大器中提供可控稳态电流波形成形的系统和方法。 前置放大器提供包括具有通过前置放大器的写入块电路可控的稳态电流电平的写入电流波形的输出。 这增强了波形的能力，以促进改进的在轨和非轨道写入性能。

公开(公告)号：US08792197B1

公开(公告)日：2014-07-29

申请号：US14074325

申请日：2013-11-07

Applicant: LSI Corporation

Inventor： Ross S. Wilson ,  Jason P. Brenden ,  Paul Mazur ,  Cameron C. Rabe ,  Gang Chen

IPC: G11B5/09 ,  G11B5/02

CPC classification number: G11B5/02 ,  G11B5/022 ,  G11B20/10009

Abstract: A hard disk drive or other storage device comprises a storage medium, a write head, and control circuitry coupled to the write head. The control circuitry comprises a write driver configured to generate a write signal comprising write pulses responsive to write data, and a driver controller configured to adjust overshoot amplitudes of respective ones of the write pulses utilizing a segmented digital-to-analog converter. The overshoot amplitudes are adjusted by detecting patterns in the write data, decoding a first portion of a base overshoot value to identify a corresponding number of base overshoot segments, combining the base overshoot value and a differential overshoot value, decoding a first portion of the combined base overshoot and differential overshoot values to identify a corresponding number of enhanced overshoot segments, and selecting between the number of base overshoot segments and the number of enhanced overshoot segments responsive to detection of a particular pattern.

Abstract translation: 硬盘驱动器或其他存储设备包括存储介质，写入头和耦合到写入头的控制电路。 控制电路包括一个写入驱动器，该写入驱动器经配置以产​​生写入信号，该写入信号包括响应于写入数据的写入脉冲，以及驱动器控制器，配置为利用分段的数模转换器来调整相应写入脉冲的过冲幅度。 通过检测写入数据中的图形来调整过冲幅度，对基本过冲值的第一部分进行解码以识别相应数量的基极过冲段，组合基极过冲值和差分过冲值，对组合的第一部分进行解码 基极过冲和差分过冲值，以识别相应数量的增强过冲段，并且响应于特定模式的检测，在基极过冲段的数量和增强的过冲段之间进行选择。

公开(公告)号：US08760784B2

公开(公告)日：2014-06-24

申请号：US13157646

申请日：2011-06-10

Applicant: Toshihiko Sakai ,  Yoshiteru Murakami

Inventor： Toshihiko Sakai ,  Yoshiteru Murakami

IPC: G11B5/09

CPC classification number: G11B5/02 ,  B82Y10/00 ,  G11B5/746 ,  G11B2005/0005

Abstract: Disclosed is a magnetic recording/reproduction device 2 including: a recording/reproduction head 7; and a recording/reproduction head 7 for detecting a leakage magnetic field of each of the plurality of magnetic recording cells 1 so as to reproduce information, the recording/reproduction head 7 carrying out the recording on the magnetic recording medium 4 so that the magnetic recording medium 4 includes continuous recording regions that (i) satisfy Nmin≧2 and that (ii) include a continuous recording region that satisfies N≠n×Nmin, where N represents a number of magnetic recording cells 1 in a continuous recording region; Nmin represents a minimum value for N; and n represents a positive integer, the continuous recording regions each being a region on a reproduction track in which region magnetic recording cells 1 sharing an identical magnetization direction are sequentially arranged in a circumferential direction of the magnetic recording medium 4.

Abstract translation: 公开了一种磁记录/再现装置2，包括：记录/再现头7; 以及记录/再现头7，用于检测多个磁记录单元1中的每个磁记录单元1的泄漏磁场以再现信息，记录/再现头7在磁记录介质4上执行记录，使得磁记录 介质4包括（i）满足Nmin≥2并且（ii）包括满足N≠n×Nmin的连续记录区域的连续记录区域，其中N表示连续记录区域中的磁记录单元1的数量; Nmin表示N的最小值; 并且n表示正整数，连续记录区域各自是在磁记录介质4的圆周方向上顺序地布置有共享相同磁化方向的区域磁记录单元1的再现轨道上的区域。

公开(公告)号：US20140133047A1

公开(公告)日：2014-05-15

申请号：US14071787

申请日：2013-11-05

Applicant: SHOWA DENKO K.K.

Inventor： Hideaki TAKAHOSHI ,  Daisuke Amiya ,  Hiroshi Sakai

IPC: G11B20/12

CPC classification number: G11B20/1217 ,  G11B5/02 ,  G11B5/59633 ,  G11B5/82 ,  G11B2020/1281 ,  G11B2220/237 ,  G11B2220/2508

Abstract: A servo information recording method continuously records servo information in a radial direction of a magnetic disk on a plurality of concentric tracks or on a single spiral track of a first recording layer that forms a magnetic layer of the magnetic disk together with a second recording layer to which data are recorded and from which data are reproduced, wherein the first recording layer has a coercivity higher than that of the second recording layer, and partially overlaps two mutually adjacent tracks when continuously recording the servo information on an entire surface of the first recording layer.

Abstract translation: 伺服信息记录方法将磁盘的径向上的伺服信息连续地记录在与第二记录层一起形成磁盘的磁性层的多个同心轨道上或在第一记录层的单个螺旋轨道上 记录哪些数据并从中再现数据，其中当在第一记录层的整个表面上连续记录伺服信息时，第一记录层的矫顽力高于第二记录层的矫顽力，并且部分重叠两个相互相邻的轨道 。

公开(公告)号：US20140126077A1

公开(公告)日：2014-05-08

申请号：US13666966

申请日：2012-11-02

Applicant: HGST NETHERLANDS B.V.

Inventor： John Thomas Contreras ,  Samir Y. Garzon

IPC: G11B5/09

CPC classification number: G11B5/02 ,  G11B5/09 ,  G11B20/10027 ,  G11B2005/001

Abstract: A Dynamic Wave-Shaping (DWS) write driver for use in a preamp in a disk drive is described. The DWS write driver includes a Dynamic Current Booster (DCB) that adds a current component (WDCB) to the standard write driver signal (including overshoot) that is a function of the bit spacing in the write data input waveform supplied to the write driver. The invention allows dynamic control of the bit-pattern dependent overshoot amplitude without requiring significant preamp overhead. Embodiments of the Dynamic Current Booster include a programmable analog feed-forward timer at the preamp level. The boost current amplitude is a function of the time between the transitions that represent bits. In embodiments, the polarity of the boost current WDCB can be programmed to be positive or negative.

Abstract translation: 描述了用于磁盘驱动器中的前置放大器的动态波形整形（DWS）写驱动程序。 DWS写入驱动器包括一个动态电流增强器（DCB），它将标准写入驱动器信号（包括过冲）的电流分量（WDCB）添加到提供给写入驱动器的写入数据输入波形中的位间隔的函数。 本发明允许动态地控制位模式相关的过冲幅度，而不需要明显的前置放大器开销。 动态电流增压器的实施例包括在前置放大器级的可编程模拟前馈定时器。 升压电流幅度是表示位的转换之间的时间的函数。 在实施例中，升压电流WDCB的极性可被编程为正或负。

公开(公告)号：US08654465B2

公开(公告)日：2014-02-18

申请号：US13316342

申请日：2011-12-09

Applicant: Patrick Mesquita Braganca ,  Richard Leo Galbraith ,  Bruce Alvin Gurney ,  Neil Smith ,  Bruce Wilson ,  Rehan Ahmed Zakai

Inventor： Patrick Mesquita Braganca ,  Richard Leo Galbraith ,  Bruce Alvin Gurney ,  Neil Smith ,  Bruce Wilson ,  Rehan Ahmed Zakai

IPC: G11B20/06 ,  G11B5/02

CPC classification number: G11B5/02 ,  G01R33/093 ,  G01R33/1284 ,  G11B5/3903 ,  G11B20/10018 ,  G11B2005/0016 ,  G11B2220/2516 ,  H03B15/006

Abstract: A method, apparatus, and system are provided for implementing spin-torque oscillator (STO) sensing with a demodulator for hard disk drives. The demodulator measures an instantaneous phase of the readback signal from a STO sensor and converts the readback signal into a signal that is proportional to the magnetic field affecting the STO frequency during a bit time. The converted signal is used for processing by conventional data detection electronics.

Abstract translation: 提供了一种用于实现用于硬盘驱动器的解调器的自旋扭矩振荡器（STO）感测的方法，装置和系统。 解调器测量来自STO传感器的回读信号的瞬时相位，并将回读信号转换成与位时间内影响STO频率的磁场成比例的信号。 转换的信号用于常规数据检测电子设备的处理。

公开(公告)号：US20130329317A1

公开(公告)日：2013-12-12

申请号：US13966126

申请日：2013-08-13

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Kenichiro YAMADA ,  Hitoshi IWASAKI ,  Junichi AKIYAMA ,  Masayuki TAKAGISHI ,  Tomomi FUNAYAMA ,  Masahiro TAKASHITA ,  Mariko SHIMIZU ,  Shuichi MURAKAMI ,  Tadashi KAI

IPC: G11B5/17

CPC classification number: G11B5/17 ,  G11B5/02 ,  G11B5/1278 ,  G11B5/3133 ,  G11B5/3146 ,  G11B2005/0002 ,  G11B2005/0024

Abstract: An example magnetic writing head includes a main magnetic pole and a coil to generate an ampere magnetic field to magnetize the main magnetic pole to cause the magnetized main magnetic pole to generate a magnetic field. The laminated body includes a first magnetic layer, and a second magnetic layer.

Abstract translation: 磁性写入头包括主磁极和线圈，用于产生安培磁场，以磁化主磁极，使磁化的主磁极产生磁场。 层叠体包括第一磁性层和第二磁性层。