公开(公告)号：US08027110B1

公开(公告)日：2011-09-27

申请号：US12844348

申请日：2010-07-27

申请人： Noboru Yamanaka ,  Tomoyuki Sasaki ,  Takuya Adachi ,  Isamu Sato ,  Hiroshi Ikeda

发明人： Noboru Yamanaka ,  Tomoyuki Sasaki ,  Takuya Adachi ,  Isamu Sato ,  Hiroshi Ikeda

IPC分类号： G11B27/36

CPC分类号： G01R33/091 ,  G11B5/314 ,  G11B2005/0024

摘要： A measurement circuit system of a magnetic field measurement apparatus of the present invention includes an amplifier, a mixer circuit and a band-pass filter that are connected in order on an output end side of a microstrip line or a coplanar wave guide, which is an in-plane high frequency magnetic field intensity measurement element, a frequency immediately before being inputted in the band-pass filter is down-converted by the mixer circuit to a frequency so that a band width of the band-pass filter can be used, the band-pass filter uses a narrow band of ±0.5-±10 KHz (1 KHz-20 KHz as a bandwidth) centering a fundamental frequency selected from 5-20 MHz that is down-converted by the mixer circuit as a center peak passing frequency, and the measurement circuit system is configured to obtain 3 dB or greater of a signal-to-noise ratio (SNR) that is a ratio of S with N; where S represents the reproduction voltage (reproduction output) of the high frequency reproduction signal induced by the in-plane high frequency magnetic field intensity measurement element, and N represents a total noise voltage of a circuit noise including a noise generated by the in-plane high frequency magnetic field intensity measurement element. Therefore, the in-plane high frequency magnetic field that a microwave-assisted magnetic head generates can be measured with high reliability and precision.

摘要翻译： 本发明的磁场测量装置的测量电路系统包括在微带线或共面波导的输出端侧依次连接的放大器，混频器电路和带通滤波器，它是 在平面内的高频磁场强度测量元件中，紧接在带通滤波器中输入的频率由混频器电路下变频到频率，使得可以使用带通滤波器的带宽， 带通滤波器采用±0.5〜10KHz（1KHz-20KHz作为带宽）的中心峰值通过频率，该频带以选择5-20MHz的基频为中心，由频率调制器电路进行下变频 并且测量电路系统被配置为获得S与N的比率的3dB或更大的信噪比（SNR）; 其中S表示由面内高频磁场强度测量元件感应的高频再现信号的再现电压（再现输出），N表示包括由平面内高频磁场强度测量元件产生的噪声的电路噪声的总噪声电压 高频磁场强度测量元件。 因此，可以高可靠性和精度地测量微波辅助磁头产生的平面内高频磁场。

公开(公告)号：US08107352B1

公开(公告)日：2012-01-31

申请号：US12852775

申请日：2010-08-09

申请人： Noboru Yamanaka ,  Takuya Adachi ,  Isamu Sato ,  Hiroshi Ikeda

发明人： Noboru Yamanaka ,  Takuya Adachi ,  Isamu Sato ,  Hiroshi Ikeda

IPC分类号： G11B7/00 ,  G11B5/147

CPC分类号： G11B5/314 ,  G11B5/1278 ,  G11B2005/0024

摘要： A microwave assisted magnetic head is formed to include a main pole magnetic layer including a main pole; a shielded magnetic layer including a shielded pole; a recording coil that is formed to generate a writing magnetic field from a tip of the main pole; and a microwave radiation waveguide made of a conductive nonmagnetic material that is disposed in a recording gap, the recording gap being a gap between the main pole and the shielded pole. The main pole magnetic layer and the shielded magnetic layer have an intermediate connection part that connects the layers at a depth-side, and an electrical insulation magnetic film is disposed in the intermediate connection part, and the main pole and the shielded pole are electrically connected with the microwave radiation waveguide that is disposed in the recording gap, which is the gap between the main pole and the shielded pole so that a simple configuration, with a relatively easy and efficient manufacturing process, is realized that overlaps AC magnetic fields in an in-plane direction of a microwave band, which is the same as, or close to, a ferromagnetic resonant frequency of a medium recording layer.

摘要翻译： 微波辅助磁头形成为包括主极的主极磁性层; 包括屏蔽极的屏蔽磁性层; 形成为从主极的尖端产生书写磁场的记录线圈; 以及设置在记录间隙中的由导电非磁性材料制成的微波辐射波导，记录间隙是主极和屏蔽极之间的间隙。 主极磁性层和屏蔽磁性层具有在深度侧连接层的中间连接部，并且在中间连接部中设置电绝缘性的磁性膜，并且主极和屏蔽极电气连接 利用布置在作为主极和屏蔽极之间的间隙的记录间隙中的微波辐射波导，从而实现了具有相对简单和有效的制造工艺的简单配置，其与交流磁场重叠， 与介质记录层的铁磁谐振频率相同或接近的微波频带的平面方向。

公开(公告)号：US20110248710A1

公开(公告)日：2011-10-13

申请号：US12755803

申请日：2010-04-07

申请人： Isamu SATO ,  Hiroshi Ikeda ,  Mikio Matsuzaki ,  Tetsuya Roppongi ,  Noboru Yamanaka ,  Tsutomu Aoyama

发明人： Isamu SATO ,  Hiroshi Ikeda ,  Mikio Matsuzaki ,  Tetsuya Roppongi ,  Noboru Yamanaka ,  Tsutomu Aoyama

IPC分类号： G01R33/02

CPC分类号： G11B5/455 ,  G01R33/098 ,  G01R33/1284

摘要： A measuring circuit system in a magnetic field measuring apparatus of the invention has an amplifier and a band-pass filter connected in sequence on an output terminal side of the TMR element, the band-pass filter is a narrow-range band-pass filter such that a peak pass frequency of the filter that is a center is a basic frequency selected from a range of 10 to 40 GHz and a band width centered around the basic frequency is a narrow range of ±0.5 to ±4 GHz; and with the measuring circuit system, an SIN ratio (SNR) of 3 dB or greater is obtained, the SNR being defined by a ratio of an amplitude S of a high-frequency generated signal induced by the TMR element to a total noise N that is a sum of a head noise generated by the TMR element and a circuit noise generated by the amplifier. With such a configuration, an in-plane high-frequency magnetic field generated by a microwave-assisted magnetic head is reliably and precisely measured.

摘要翻译： 本发明的磁场测量装置中的测量电路系统具有在TMR元件的输出端侧依次连接的放大器和带通滤波器，带通滤波器是窄范围带通滤波器， 作为中心的滤波器的峰值通过频率是从10〜40GHz的范围选择的基本频率，以基本频率为中心的频带宽度为±0.5〜±4GHz的窄范围; 并且利用测量电路系统，获得3dB或更大的SIN比（SNR），SNR由TMR元件引起的高频产生信号的振幅S与总噪声N的比值定义， 是由TMR元件产生的头噪声和由放大器产生的电路噪声的总和。 通过这样的结构，可以可靠且精确地测量由微波辅助磁头产生的面内高频磁场。

公开(公告)号：US08358127B2

公开(公告)日：2013-01-22

申请号：US12755803

申请日：2010-04-07

申请人： Isamu Sato ,  Hiroshi Ikeda ,  Mikio Matsuzaki ,  Tetsuya Roppongi ,  Noboru Yamanaka ,  Tsutomu Aoyama

发明人： Isamu Sato ,  Hiroshi Ikeda ,  Mikio Matsuzaki ,  Tetsuya Roppongi ,  Noboru Yamanaka ,  Tsutomu Aoyama

IPC分类号： G01R33/02

CPC分类号： G11B5/455 ,  G01R33/098 ,  G01R33/1284

摘要： A measuring circuit system in a magnetic field measuring apparatus of the invention has an amplifier and a band-pass filter connected in sequence on an output terminal side of the TMR element, the band-pass filter is a narrow-range band-pass filter such that a peak pass frequency of the filter that is a center is a basic frequency selected from a range of 10 to 40 GHz and a band width centered around the basic frequency is a narrow range of ±0.5 to ±4 GHz; and with the measuring circuit system, an SIN ratio (SNR) of 3 dB or greater is obtained, the SNR being defined by a ratio of an amplitude S of a high-frequency generated signal induced by the TMR element to a total noise N that is a sum of a head noise generated by the TMR element and a circuit noise generated by the amplifier. With such a configuration, an in-plane high-frequency magnetic field generated by a microwave-assisted magnetic head is reliably and precisely measured.

摘要翻译： 本发明的磁场测量装置中的测量电路系统具有在TMR元件的输出端侧依次连接的放大器和带通滤波器，带通滤波器是窄范围带通滤波器， 作为中心的滤波器的峰值通过频率是从10〜40GHz的范围选择的基本频率，以基本频率为中心的带宽为±0.5〜±4GHz的窄范围; 并且利用测量电路系统，获得3dB或更大的SIN比（SNR），SNR由TMR元件引起的高频产生信号的振幅S与总噪声N的比值定义， 是由TMR元件产生的头噪声和由放大器产生的电路噪声的总和。 通过这样的结构，可以可靠且精确地测量由微波辅助磁头产生的面内高频磁场。

公开(公告)号：US08559123B2

公开(公告)日：2013-10-15

申请号：US12801540

申请日：2010-06-14

申请人： Kei Hirata ,  Norikazu Ota ,  Noboru Yamanaka

发明人： Kei Hirata ,  Norikazu Ota ,  Noboru Yamanaka

IPC分类号： G11B5/09

CPC分类号： G11B5/1278 ,  B82Y10/00 ,  G11B5/743

摘要： This magnetic recording device is provided with a magnetic write head having a magnetic pole, and a magnetic recording medium having a plurality of data recording blocks. Each of the data recording blocks is formed with a plurality of write tracks, and separated, in a write track width direction, from neighboring one of the data recording blocks with a writing exudation suppression section in between. With this configuration, a magnetic mutual interference of the adjacent data recording blocks at the time of a data rewriting process is avoided even when a mutual interval of the data recording blocks is narrowed, and a good recording state is maintained in each of the data recording blocks. Therefore, it is possible to achieve an improvement in a recording density, while realizing the good and brief data rewriting process for each of the data recording blocks.

摘要翻译： 该磁记录装置设置有具有磁极的磁写头和具有多个数据记录块的磁记录介质。 每个数据记录块形成有多个写入磁道，并且在写入磁道宽度方向上与相邻的一个数据记录块之间具有写入渗出抑制部分。 利用这种配置，即使当数据记录块的相互间隔变窄时也避免了在数据重写处理时相邻的数据记录块的磁互相干扰，并且在每个数据记录中保持良好的记录状态 块。 因此，可以实现对每个数据记录块的良好且简短的数据重写处理的记录密度的提高。

公开(公告)号：US08085491B2

公开(公告)日：2011-12-27

申请号：US12659129

申请日：2010-02-26

申请人： Yosuke Antoku ,  Noboru Yamanaka ,  Masashi Sano ,  Kosuke Tanaka ,  Man Tse ,  Eric Cheuk Wing Leung ,  Luke Hung Leung Chung

发明人： Yosuke Antoku ,  Noboru Yamanaka ,  Masashi Sano ,  Kosuke Tanaka ,  Man Tse ,  Eric Cheuk Wing Leung ,  Luke Hung Leung Chung

IPC分类号： G11B2/21

CPC分类号： G11B5/6005 ,  G11B5/6064

摘要： For obtaining a flying height of a magnetic head from a magnetic disk, the magnetic head being placed in a slider arranged at an interval with the magnetic disk, an initial setting process and a flying height detecting process are performed. In the initial setting process, driving power to a heater is increased gradually, from a state where the heater arranged at a position in proximity to the magnetic head in the slider is not driven, until the magnetic head makes contact with the magnetic disk. Then, in each stage, an electrical resistance value of the sensor arranged at a position in proximity to the magnetic head in the slider, which is increased due to the heat from heater, and either an approach distance of the magnetic head toward the magnetic disk or the flying height of the magnetic head from the magnetic disk are acquired. Then, basic data is prepared by obtaining the relationship between a variation of the electrical resistance value of the sensor and the flying height of the magnetic head from the magnetic disk, which is obtained in each stage or which calculated from the approach distance in each stage. In the flying height detecting process, an electrical resistance value of the sensor is determined, and a variation of the electrical resistance value is calculated from the determined values. Then, the flying height of the magnetic head from the magnetic disk in the state where the electrical resistance value was determined is obtained based on the basic data obtained in the initial setting process, using the calculated variation of the electrical resistance value.

公开(公告)号：US20110211275A1

公开(公告)日：2011-09-01

申请号：US12659129

申请日：2010-02-26

申请人： Yosuke Antoku ,  Noboru Yamanaka ,  Masashi Sano ,  Kosuke Tanaka ,  Man Tse ,  Eric Cheuk Wing Leung ,  Luke Hung Leung Chung

发明人： Yosuke Antoku ,  Noboru Yamanaka ,  Masashi Sano ,  Kosuke Tanaka ,  Man Tse ,  Eric Cheuk Wing Leung ,  Luke Hung Leung Chung

IPC分类号： G11B21/02

CPC分类号： G11B5/6005 ,  G11B5/6064

摘要： For obtaining a flying height of a magnetic head from a magnetic disk, the magnetic head being placed in a slider arranged at an interval with the magnetic disk, an initial setting process and a flying height detecting process are performed. In the initial setting process, driving power to a heater is increased gradually, from a state where the heater arranged at a position in proximity to the magnetic head in the slider is not driven, until the magnetic head makes contact with the magnetic disk. Then, in each stage, an electrical resistance value of the sensor arranged at a position in proximity to the magnetic head in the slider, which is increased due to the heat from heater, and either an approach distance of the magnetic head toward the magnetic disk or the flying height of the magnetic head from the magnetic disk are acquired. Then, basic data is prepared by obtaining the relationship between a variation of the electrical resistance value of the sensor and the flying height of the magnetic head from the magnetic disk, which is obtained in each stage or which calculated from the approach distance in each stage. In the flying height detecting process, an electrical resistance value of the sensor is determined, and a variation of the electrical resistance value is calculated from the determined values. Then, the flying height of the magnetic head from the magnetic disk in the state where the electrical resistance value was determined is obtained based on the basic data obtained in the initial setting process, using the calculated variation of the electrical resistance value.

摘要翻译： 为了从磁盘获得磁头的飞行高度，磁头被放置在与磁盘间隔设置的滑块中，执行初始设定处理和飞行高度检测处理。 在初始设定处理中，从布置在滑动件附近的磁头的位置的加热器未被驱动的状态直到磁头与磁盘接触的状态逐渐增加到加热器的驱动电力。 然后，在各阶段，布置在靠近滑块的磁头的位置处的传感器的电阻值由于来自加热器的热而增加，并且磁头朝向磁盘的接近距离 或者从磁盘获取磁头的飞行高度。 然后，通过获得传感器的电阻值的变化与来自磁盘的磁头的飞行高度之间的关系来准备基本数据，该关系是在每个阶段中获得的，或者由每个阶段中的接近距离计算 。 在飞行高度检测处理中，确定传感器的电阻值，并根据确定的值计算电阻值的变化。 然后，使用计算出的电阻值的变化，基于在初始设定处理中获得的基本数据，求出在确定了电阻值的状态下磁头从磁盘的飞行高度。

公开(公告)号：US6031696A

公开(公告)日：2000-02-29

申请号：US92873

申请日：1998-06-08

申请人： Noboru Yamanaka

发明人： Noboru Yamanaka

IPC分类号： G11B5/31 ,  G11B5/39 ,  G11B5/147 ,  G11B5/187

CPC分类号： G11B5/3967 ,  G11B5/3109 ,  G11B5/3143 ,  G11B5/312

摘要： A thin-film magnetic head includes a recording gap layer, lower and upper magnetic pole layers deposited to sandwich the recording gap layer, the upper magnetic pole layer having side surfaces facing toward a track width direction, and non-magnetic conductive material members being in contact with at least a part of the respective side surfaces of the upper magnetic pole layer and in contact with the lower magnetic pole layer.

摘要翻译： 薄膜磁头包括记录间隙层，沉积以夹持记录间隙层的下磁极层和上磁极层，上磁极层具有面向轨道宽度方向的侧表面，并且非磁性导电材料构件位于 与上磁极层的相应侧表面的至少一部分接触并与下磁极层接触。

公开(公告)号：US5995329A

公开(公告)日：1999-11-30

申请号：US70981

申请日：1998-05-01

申请人： Masashi Shiraishi ,  Noboru Yamanaka

发明人： Masashi Shiraishi ,  Noboru Yamanaka

IPC分类号： G11B5/60 ,  G11B5/48 ,  G11B5/56 ,  G11B21/21 ,  H05K1/02 ,  H05K1/05

CPC分类号： H05K1/0253 ,  G11B5/4826 ,  G11B5/4853 ,  H05K1/0224 ,  H05K1/0272 ,  H05K1/056 ,  H05K2201/09681 ,  H05K2201/0969

摘要： A hard magnetic disc unit having a plurality of head gimbal assemblies. Each head gimbal assembly has a magnetic head slider, a metal suspension for supporting the magnetic head slider, and insulating material layer formed on the metal suspension, and a conductive pattern of lead lines electrically connected with the magnetic head. The conductive pattern is formed on the insulating material layer. There are arm portions for supporting the respective head gimbal assemblies and an actuator for moving the arm portions to position the magnetic head sliders. There are also a plurality of resistors having a high resistance value for discharging electrostatic charge. The head gimbal assemblies are electrically insulated from a ground, and the resistors are connected between the head gimbal assemblies and the ground, respectively.

摘要翻译： 具有多个头部万向节组件的硬磁盘单元。 每个头万向架组件具有磁头滑块，用于支撑磁头滑块的金属悬架和形成在金属悬架上的绝缘材料层，以及与磁头电连接的导线的导电图案。 导电图案形成在绝缘材料层上。 存在用于支撑相应的头万向架组件的臂部分和用于移动臂部分以定位磁头滑块的致动器。 还有多个电阻器具有用于放电静电电荷的高电阻值。 头万向架组件与地面电绝缘，电阻分别连接在头部万向架组件和地面之间。

公开(公告)号：US07187521B2

公开(公告)日：2007-03-06

申请号：US10778228

申请日：2004-02-17

申请人： Noboru Yamanaka ,  Norikazu Ota

发明人： Noboru Yamanaka ,  Norikazu Ota

IPC分类号： G11B5/31

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/10 ,  G11B5/105 ,  G11B5/11 ,  G11B5/3103 ,  G11B5/3967 ,  G11B5/40 ,  G11B5/4886 ,  G11B2005/3996

摘要： A thin-film magnetic head comprises at least one of a magnetoresistive device for reading and an electromagnetic transducer device for writing, and a heating element provided in the head body part. The heating element has an up portion meandering between an origin and a halfway point and a down portion meandering along the up portion from the halfway point to an end positioned in the vicinity of the origin, and adapted to generate heat when energized.