公开(公告)号：US20090313811A1

公开(公告)日：2009-12-24

申请号：US12487306

申请日：2009-06-18

申请人： Toshio Takahashi ,  Akihiro Nanba ,  Masafumi Mochizuki

发明人： Toshio Takahashi ,  Akihiro Nanba ,  Masafumi Mochizuki

IPC分类号： H04R31/00

CPC分类号： G11B5/1278 ,  G11B5/3163 ,  G11B5/3169 ,  G11B5/3173 ,  G11B5/3967 ,  Y10T29/49036 ,  Y10T29/49039 ,  Y10T29/49043 ,  Y10T29/49044 ,  Y10T29/49048 ,  Y10T29/49052 ,  Y10T29/4906

摘要： In a manufacturing process of a head slider according to one embodiment, a flare point height of a main pole is estimated according to the following procedure. Magnetic field intensity is measured by a sensor, and a maximum point of the magnetic field is assumed as a center of the main pole. The measurement is moved from the center point along a Z direction, such that a measurement value corresponds to a reference value. An attenuation rate (a gradient) of a measurement value of magnetic field intensity to displacement in the Z direction of the measurement point is calculated and normalized with the measurement value, and plotted with respect to the measurement value itself. The gradient is compared to a gradient in a database of samples being separately prepared, each sample having known flare point height, allowing an estimation of the flare point height of the said sample from the comparison.

摘要翻译： 在根据一个实施例的磁头滑块的制造过程中，根据以下过程来估计主极的耀斑高度。 磁场强度由传感器测量，磁场的最大点被认为是主极的中心。 测量从中心点沿Z方向移动，使得测量值对应于参考值。 计算测量点的Z方向的磁场强度测量值与位移的衰减率（梯度），并用测量值对其进行归一化，并相对于测量值本身绘制。 将梯度与分别制备的样品的数据库中的梯度进行比较，每个样品具有已知的光斑高度，允许从比较中估计所述样品的耀斑高度。

公开(公告)号：US07545595B2

公开(公告)日：2009-06-09

申请号：US11354912

申请日：2006-02-16

申请人： Takehiko Hamaguchi ,  Atsushi Nakamura ,  Yasutaka Nishida ,  Masafumi Mochizuki ,  Hideki Sawaguchi

发明人： Takehiko Hamaguchi ,  Atsushi Nakamura ,  Yasutaka Nishida ,  Masafumi Mochizuki ,  Hideki Sawaguchi

IPC分类号： G11B5/02

CPC分类号： G11B5/6005 ,  G11B5/012 ,  G11B5/105 ,  G11B5/127 ,  G11B5/1272 ,  G11B5/2654 ,  G11B5/4886 ,  G11B5/56 ,  G11B2005/001 ,  G11B2005/0021

摘要： A magnetic disk apparatus including: a disk holding data as magnetic information on a magnetic recording film; a head to perform writing and reading of the magnetic information; a rotary actuator to move the head in a radial direction of the disk; plural heat elements in the head to locally heat the disk; a write element in the head to apply a magnetic field to the disk; and means for selecting at least one heat element from the plural heat elements, wherein the means for selecting the heat element selects at least one heat element from the plural heat elements so as to bring a center line of an area heated by the heat element and a center line of the position of the magnetic field generated by the write element into approximate correspondence, in correspondence with a relative angle between the head and a direction of movement of the disk.

摘要翻译： 一种磁盘装置，包括：磁盘，其将数据作为磁性信息保存在磁记录膜上; 执行写入和读取磁信息的头部; 旋转致动器，用于沿着盘的径向方向移动头部; 头部中的多个热元件以局部加热盘; 磁头中的一个写元件将磁场施加到磁盘上; 以及用于从所述多个加热元件中选择至少一个加热元件的装置，其中用于选择所述加热元件的装置从所述多个加热元件中选择至少一个加热元件，以使得由所述加热元件加热的区域的中心线，以及 由写入元件产生的磁场的位置的中心线对应于磁头与磁盘的移动方向之间的相对角度相对应。

公开(公告)号：US07542244B2

公开(公告)日：2009-06-02

申请号：US11252866

申请日：2005-10-17

申请人： Hiroshi Fukui ,  Yoji Maruyama ,  Masafumi Mochizuki ,  Tomohiro Okada

发明人： Hiroshi Fukui ,  Yoji Maruyama ,  Masafumi Mochizuki ,  Tomohiro Okada

IPC分类号： G11B5/127

CPC分类号： G11B5/1278

摘要： Embodiments of the invention provide a magnetic head (magnetic disk storage) which does not erase data on a recording medium even when a stray field is applied. In one embodiment, the head has a structure that d1

摘要翻译： 本发明的实施例提供一种磁头（磁盘存储），即使在施加杂散场时也不会在记录介质上擦除数据。 在一个实施例中，头部具有d1 =

公开(公告)号：US07475470B2

公开(公告)日：2009-01-13

申请号：US10774370

申请日：2004-02-10

申请人： Masafumi Mochizuki ,  Tomohiro Okada ,  Atsushi Nakamura

发明人： Masafumi Mochizuki ,  Tomohiro Okada ,  Atsushi Nakamura

IPC分类号： G11B5/187

CPC分类号： G11B5/1278 ,  G11B5/1872 ,  G11B5/3967 ,  G11B5/4886 ,  G11B2005/0029 ,  Y10T29/49046 ,  Y10T29/49048 ,  Y10T29/49052

摘要： On the trailing side of a main pole air bearing surface of a magnetic head for perpendicular recording, the central portion is formed closer to the leading side than the corners on the trailing side, such that the main pole air bearing surface is formed in the shape of a recess with respect to the tailing side. As a result, it is possible to linearize the magnetic field distribution on the trailing side whereby the magnetic reversal is determined, and to record a bit without curving the shape of magnetic reversal.

摘要翻译： 在用于垂直记录的磁头的主极空气轴承表面的后侧，中心部形成为比在后侧的角部更靠近前侧，使得主极空气轴承表面形成为 相对于尾部的凹部。 结果，可以线性化后侧的磁场分布，由此确定磁反转，并且记录位而不会使磁反转的形状弯曲。

公开(公告)号：US07426092B2

公开(公告)日：2008-09-16

申请号：US11173730

申请日：2005-06-30

申请人： Hiroshi Fukui ,  Masafumi Mochizuki ,  Kaori Suzuki

发明人： Hiroshi Fukui ,  Masafumi Mochizuki ,  Kaori Suzuki

IPC分类号： G11B5/127

CPC分类号： G11B5/127

摘要： Embodiments of the invention provide a magnetic head which prevents data on a recording medium from being erased even when a stray field is applied. In one embodiment, an auxiliary pole is sandwiched between a stray-field shield composed of a magnetic layer recessed from the air bearing surface and a main pole. The stray-field shield may be formed on the leading side of the auxiliary pole. A face of the stray-field shield on a medium side may be recessed from an air-bearing-surface of the magnetic head.

摘要翻译： 本发明的实施例提供一种磁头，即使当施加杂散场时也防止记录介质上的数据被擦除。 在一个实施例中，辅助极被夹在由空气支承表面凹入的磁性层和主极之间的杂散场屏蔽之间。 杂散场屏蔽可以形成在辅助极的前导侧。 介质侧的杂散屏蔽层的表面可以从磁头的空气轴承表面凹入。

公开(公告)号：US20070217066A1

公开(公告)日：2007-09-20

申请号：US11802297

申请日：2007-05-22

申请人： Yoshiaki Kawato ,  Kazuhiro Nakamoto ,  Hiroyuki Hoshiya ,  Yasuyuki Okada ,  Masafumi Mochizuki

发明人： Yoshiaki Kawato ,  Kazuhiro Nakamoto ,  Hiroyuki Hoshiya ,  Yasuyuki Okada ,  Masafumi Mochizuki

IPC分类号： G11B5/127

CPC分类号： G11B5/3906 ,  G11B5/1278

摘要： Thin film perpendicular magnetic head with a narrow main pole capable of a high recording density in excess of 100 gigabits per square inch and generating a high magnetic recording field exceeding 10 kOe (oersted), while also modified to suppress remanent magnetic fields occurring immediately after writing operation. In a perpendicular magnetic head comprising a main pole, a return path for supplying a magnetic flux to that main pole, and an conductive coil for excitation of the main pole and return path, the main pole has a pole width of 200 nanometers or less, and a magnetic multilayer made up of a high saturation flux density layer and low saturation flux density layer, the low saturation flux density layer has a thickness within 0.5 to 5 nanometers, the high saturation flux density layer has a thickness from 10 to 50 nanometers for suppressing remanent magnetization and preventing erasing after writing by utilizing a closed magnetic domain structure in the pole.

摘要翻译： 具有超过100吉比特/平方英寸的高记录密度的窄主极的薄膜垂直磁头，并产生超过10kOe（奥斯特）的高磁记录场，同时还被修改以抑制写入后立即发生的残留磁场 操作。 在包括主极，用于向该主极提供磁通的返回路径和用于激励主极返回路径的导电线圈的垂直磁头中，主极的极宽为200纳米以下， 以及由高饱和磁通密度层和低饱和磁通密度层组成的磁性层，低饱和磁通密度层的厚度在0.5〜5纳米之间，高饱和磁通密度层的厚度为10〜50纳米， 通过利用极中的闭合磁畴结构来抑制剩磁，并防止写入后的擦除。

公开(公告)号：US07180704B2

公开(公告)日：2007-02-20

申请号：US11134350

申请日：2005-05-23

申请人： Masafumi Mochizuki ,  Atsushi Nakamura ,  Yoji Maruyama

发明人： Masafumi Mochizuki ,  Atsushi Nakamura ,  Yoji Maruyama

IPC分类号： G11B5/17

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/1278 ,  G11B5/17 ,  G11B5/2652 ,  G11B5/313 ,  G11B5/332 ,  G11B5/3903 ,  G11B5/3909 ,  G11B5/3967 ,  G11B2005/001 ,  G11B2005/0013 ,  G11B2005/0016 ,  G11B2005/0029 ,  G11B2005/3996

摘要： A magnetic head is composed to diminish disordered writing bits of a recording layer or reading noise caused by a magnetic field generated from an under layer without decreasing a writing magnetic field strength of the magnetic head. The magnetic head includes a write head provided with a main pole and one or more auxiliary poles, a read head provided with a read element, and coils located on both sides of the main pole in a manner to sandwich the main pole. The coil located on one side generates the asymmetrical magneto-motive force for magnetizing the main pole to that generated by the coil located on the other side.

摘要翻译： 磁头被构成为减少记录层的无序写入位或从下层产生的磁场产生的噪声，而不降低磁头的写入磁场强度。 磁头包括设置有主极和一个或多个辅助极的写入头，设置有读取元件的读取头以及以主夹具的方式位于主极两侧的线圈。 位于一侧的线圈产生用于将主极磁化成位于另一侧的线圈所产生的非对称磁力。

公开(公告)号：US07038881B2

公开(公告)日：2006-05-02

申请号：US10648344

申请日：2003-08-27

申请人： Kenchi Ito ,  Yoshiaki Kawato ,  Masafumi Mochizuki

发明人： Kenchi Ito ,  Yoshiaki Kawato ,  Masafumi Mochizuki

IPC分类号： G11B5/187 ,  G11B5/39

CPC分类号： G11B5/012 ,  G11B5/1278 ,  G11B5/1871 ,  G11B5/4886 ,  G11B2005/0029 ,  Y10T29/49052

摘要： The invention provides a magnetic head for perpendicular recording capable of recording with high linear recording density and high track density, and a magnetic disk drive incorporating the same. In order to achieve this, one or more sides of the main pole of the magnetic head for perpendicular recording except for the trailing side are formed in a taper with an appropriate angle against the tip surface of the main pole, and the yoke whose widest principal plane is in parallel to the tip surface is provided on the bottom of the main pole.Thereby, the invention achieves the magnetic head for perpendicular recording that generates a sufficiently high magnetic field, and assumes a sharp gradient of magnetic field on the trailing side. By incorporating this magnetic head, a magnetic disk drive capable of handling high linear recording density can be produced.

摘要翻译： 本发明提供一种用于能够以高线性记录密度和高轨道密度进行记录的垂直记录磁头和包含该磁头的磁盘驱动器。 为了实现这一点，用于垂直记录的磁头的主极的除了后侧之外的一个或多个侧面以相对于主极的尖端表面具有适当角度的锥形形成，并且最主要的轭 平面与顶表面平行设置在主极的底部。 因此，本发明实现了用于垂直记录的磁头，其产生足够高的磁场，并且在后侧呈现尖锐的磁场梯度。 通过并入该磁头，可以产生能够处理高线性记录密度的磁盘驱动器。

公开(公告)号：US07024617B2

公开(公告)日：2006-04-04

申请号：US10206211

申请日：2002-07-29

申请人： Hideki Sawaguchi ,  Yasutaka Nishida ,  Masafumi Mochizuki ,  Hiroyuki Tsuchinaga

发明人： Hideki Sawaguchi ,  Yasutaka Nishida ,  Masafumi Mochizuki ,  Hiroyuki Tsuchinaga

IPC分类号： H03M13/03

CPC分类号： G11B20/10055 ,  G11B5/012 ,  G11B5/09 ,  G11B20/1403 ,  G11B20/18

摘要： In a partial-response maximum-likelihood (PRML) signal detection and processing technique, reduction of data detection error events caused due to medium noise is achieved. For a PRML detection data result obtained after PRML data demodulation, a code error event that depends on a signal distance, and which has a high frequency of occurrences, is noticed and its occurrence probability is estimated. A locally-existing medium noise quantity is estimated from preceding and subsequent code patterns of the PRML detection data result. Based on this, the occurrence probability of the error event is compensated to improve the detection precision. As a result, data modulation with reliability higher than conventional maximum likelihood detection can be realized with a simple circuit structure.

摘要翻译： 在部分响应最大似然（PRML）信号检测和处理技术中，实现了由于中等噪声引起的数据检测误差事件的减少。 对于在PRML数据解调之后获得的PRML检测数据结果，注意到取决于信号距离并且具有高频率出现的代码错误事件，并且估计其发生概率。 根据PRML检测数据结果的前后代码模式估计本地存在的中等噪声量。 基于此，对误差事件的发生概率进行补偿，提高检测精度。 结果，可以通过简单的电路结构实现具有高于常规最大似然检测的可靠性的数据调制。

公开(公告)号：US06657813B2

公开(公告)日：2003-12-02

申请号：US09785417

申请日：2001-02-20

申请人： Yasutaka Nishida ,  Hisashi Takano ,  Masafumi Mochizuki

发明人： Yasutaka Nishida ,  Hisashi Takano ,  Masafumi Mochizuki

IPC分类号： G11B5127

CPC分类号： G11B5/1278 ,  G11B5/00 ,  G11B5/488 ,  G11B5/667 ,  G11B5/73 ,  G11B2005/0029 ,  Y10T428/11 ,  Y10T428/31826

摘要： To make a soft magnetic underlayer of a double layered perpendicular magnetic recording medium thinner than heretofore while avoiding saturation. Assuming that Tb1 is the thickness of the soft magnetic underlayer of the double layered perpendicular magnetic recording medium, BS2 the saturation flux density of the same, Tm the thickness of a magnetic recording head's main pole 1 along a track direction in the vicinity of its floating surface, TWW the track width of the same, and BS1 the saturation flux density of the same, then Tb1

摘要翻译： 为了制造比以前更薄的双层垂直磁记录介质的软磁性底层，同时避免饱和。 假设Tb1是双层垂直磁记录介质的软磁性底层的厚度，则BS2的饱和磁通密度为Tm，磁记录头主极1的沿其轨迹方向的厚度在其浮动附近 表面，TWW的轨道宽度相同，BS1的饱和磁通密度相同，则Tb1 <（BS1xTmxTWW）/ 2（BS2x（Tm + TWW））得到满足。