公开(公告)号：US5337198A

公开(公告)日：1994-08-09

申请号：US909997

申请日：1992-07-07

申请人： Nobumasa Nishiyama ,  Toshiaki Tsuyoshi ,  Hajime Aoi ,  Tetsuji Kameoka ,  Masaya Tanaka ,  Kazuhisa Shiraishi

发明人： Nobumasa Nishiyama ,  Toshiaki Tsuyoshi ,  Hajime Aoi ,  Tetsuji Kameoka ,  Masaya Tanaka ,  Kazuhisa Shiraishi

IPC分类号： G11B5/09 ,  G11B5/035

CPC分类号： G11B5/09 ,  G11B20/10046

摘要： A waveform equalizer for processing a signal read by a magnetic head from a magnetic written medium includes a slimming circuit which, in turn, has a first delay unit for delaying the read signal, a first attenuator connected in parallel with the first delay unit, a first differentiating circuit for receiving the output from the first delay unit and the output from the first attenuator, and a resistor connected to a first delay unit side input of the first differential circuit; and a pseudo-peak elimination circuit connected in series with the slimming circuit and including a circuit for separating the from the read signal the read signal or a signal reverse in phase to the read signal, a second delay unit for delaying the separated signal, a second attenuator for attenuating the amplitude of the separated signal, and a second differential circuit for receiving the read signal and the separated, delayed and attenuated signal.

摘要翻译： 用于处理由磁性写入介质由磁头读取的信号的波形均衡器包括减弱电路，该减幅电路又具有用于延迟读取信号的第一延迟单元，与第一延迟单元并联连接的第一衰减器， 用于接收来自第一延迟单元的输出和来自第一衰减器的输出的第一微分电路，以及连接到第一差分电路的第一延迟单元侧输入的电阻器; 以及与所述减肥电路串联连接的伪峰值消除电路，并且包括用于将读取信号或相反相反的信号与读取信号分离的读取信号的电路，用于延迟分离的信号的第二延迟单元， 第二衰减器，用于衰减分离信号的振幅;以及第二差分电路，用于接收读取信号和分离的，延迟和衰减的信号。

公开(公告)号：US5218599A

公开(公告)日：1993-06-08

申请号：US412474

申请日：1989-09-26

申请人： Toshiaki Tsuyoshi ,  Yoshito Tsunoda ,  Hiromichi Fujisawa

发明人： Toshiaki Tsuyoshi ,  Yoshito Tsunoda ,  Hiromichi Fujisawa

IPC分类号： G11B11/10 ,  G11B7/00 ,  G11B7/004 ,  G11B7/005 ,  G11B7/007 ,  G11B7/24 ,  G11B7/30 ,  G11B11/105 ,  G11B13/00 ,  G11B13/04 ,  G11B20/12 ,  G11B27/32

CPC分类号： G11B11/10584 ,  G11B11/10597 ,  G11B13/045 ,  G11B27/327 ,  G11B2020/1259 ,  G11B2220/211 ,  G11B2220/2525 ,  G11B7/0079

摘要： A recording medium is provided with a recording film having opto-magnetic characteristics formed on the substrate, with first information being recorded in advance in the form of pit strings of a phase structure. Second information is recorded over the first information through the application of a magnetic field with polarities corresponding to the second information in the presence of the irradiation of a high-power radiation beam, without damaging the record of the first information. The first and second information are produced independently and simultaneously with a single spot in the same area by use of different signal reproduction mechanisms for the first information and second information. The first information (ROM information) is reproduced as the variation in the amount (intensity) of the reflected light from the opto-magnetic recording film, and the second information (RAM information) is reproduced by detecting the rotational angle of the reflected light, based on the Kerr effect, from the opto-magnetic film concurrently with the reproduction of the first information using a single spot.

摘要翻译： 记录介质设置有具有形成在基板上的光磁特性的记录膜，其中预先以相位结构的凹坑串的形式记录第一信息。 在存在高功率辐射束的照射的情况下，通过施加具有与第二信息对应的极性的磁场，在第一信息上记录第二信息，而不损害第一信息的记录。 通过对于第一信息和第二信息使用不同的信号再现机制，第一和第二信息与同一区域中的单个点独立地同时产生。 第一信息（ROM信息）被再现为来自光电记录膜的反射光的量（强度）的变化，并且通过检测反射光的旋转角度再现第二信息（RAM信息） 基于克尔效应，从与使用单个点的第一信息的再现同时的光磁膜。

公开(公告)号：US5715110A

公开(公告)日：1998-02-03

申请号：US286860

申请日：1994-08-05

申请人： Nobumasa Nishiyama ,  Toshiaki Tsuyoshi

发明人： Nobumasa Nishiyama ,  Toshiaki Tsuyoshi

IPC分类号： G11B5/02 ,  G11B5/00 ,  G11B5/09 ,  G11B5/39 ,  G11B20/24

CPC分类号： G11B5/00 ,  G11B20/24 ,  G11B5/09 ,  G11B2005/0016

摘要： In a magnetic disk apparatus of high-speed data transfer, in order to cover an uncompensable section of the thermal asperity by error code correction to shorten the uncompensable section, upper and lower envelopes of a reproduced waveform are detected to obtain a level variation waveform due to the thermal asperity and subtract it from the reproduced signal. A thermal asperity processing circuit shown in FIG. 1 for compensating for the thermal asperity is used. In an envelope detection circuit in the thermal asperity processing circuit, a forced charge and discharge current control circuit is used in the thermal asperity portion to thereby be able to improve the follow-up characteristic to level variation of the thermal asperity and shorten the uncompensable section.

摘要翻译： 在高速数据传输的磁盘装置中，为了通过错误代码校正来覆盖热不平坦部分的不可补偿部分，以缩短不可补偿部分，检测再现波形的上下包络以获得电平变化波形 到热凹凸，并从再生信号中减去它。 图1所示的热凹凸处理电路 1用于补偿热不均匀性。 在热凹凸处理电路中的包络检测电路中，在热凹凸部分中使用强制充放电电流控制电路，从而能够提高热凹凸的水平变化的跟踪特性，并缩短不可补偿部分 。

公开(公告)号：US5657176A

公开(公告)日：1997-08-12

申请号：US471460

申请日：1995-06-06

申请人： Yoshihiro Moribe ,  Tetsuji Kameoka ,  Toshiaki Tsuyoshi ,  Sumio Obata

发明人： Yoshihiro Moribe ,  Tetsuji Kameoka ,  Toshiaki Tsuyoshi ,  Sumio Obata

IPC分类号： G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18 ,  G11B27/36

CPC分类号： G11B20/10009 ,  G11B20/1258 ,  G11B27/36 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09 ,  G11B20/1833 ,  G11B2005/0013

摘要： Increased memory capacity for a magnetic disk device is realized without degrading information error rate, by making the number of sectors at a given circumference of the disk variable in accordance with a radial direction of a disk. The number of sectors is made variable by deciding a predetermined information error rate from a ratio of reproduced signal output to noises of head, disk and amplifier at a maximum recording and reproducing frequency at a certain radial position along a disk.

摘要翻译： 通过使磁盘的给定周长处的扇区数根据磁盘的径向方向变化，实现磁盘装置的增加的存储器容量而不降低信息错误率。 通过从沿着盘的特定径向位置处的最大记录和再现频率的重放信号输出到磁头，磁盘和放大器的噪声的比率确定预定的信息错误率，使扇区数变化。

公开(公告)号：US5430581A

公开(公告)日：1995-07-04

申请号：US996383

申请日：1992-12-23

申请人： Yoshihiro Moribe ,  Tetsji Kameoka ,  Toshiaki Tsuyoshi ,  Sumio Obata

发明人： Yoshihiro Moribe ,  Tetsji Kameoka ,  Toshiaki Tsuyoshi ,  Sumio Obata

IPC分类号： G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09 ,  G11B20/10 ,  G11B20/12 ,  G11B20/18 ,  G11B27/36

CPC分类号： G11B20/10009 ,  G11B20/1258 ,  G11B27/36 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09 ,  G11B20/1833 ,  G11B2005/0013

摘要： Increased memory capacity for a magnetic disk device is realized without degrading information error rate, by making the number of sectors at a given circumference of the disk variable in accordance with a radial direction of a disk. The number of sectors is made variable by deciding a predetermined information error rate from a ratio of reproduced signal output to noises of head, disk and amplifier at a maximum recording and reproducing frequency at a certain radial position along a disk.

摘要翻译： 通过使磁盘的给定周长处的扇区数根据磁盘的径向方向变化，实现磁盘装置的增加的存储器容量而不降低信息错误率。 通过从沿着盘的特定径向位置处的最大记录和再现频率的重放信号输出到磁头，磁盘和放大器的噪声的比率确定预定的信息错误率，使扇区数可变。

公开(公告)号：US5367411A

公开(公告)日：1994-11-22

申请号：US923833

申请日：1992-08-03

申请人： Nobumasa Nishiyama ,  Yasuhiro Kato ,  Toshiaki Tsuyoshi

发明人： Nobumasa Nishiyama ,  Yasuhiro Kato ,  Toshiaki Tsuyoshi

IPC分类号： G11B5/00 ,  G11B5/09 ,  G11B5/40 ,  G11B5/465 ,  G11B5/03 ,  G11B5/127 ,  G11B5/33

CPC分类号： G11B5/09 ,  G11B5/40 ,  G11B5/465 ,  G11B2005/0016 ,  G11B2005/0018

摘要： A magnetic recording and reproducing apparatus, comprising a magnetic recording medium, a head arrangement for reading data from or writing data on the magnetic recording medium including an inductive recording head and a magnetoresistive reproducing head, and a phase discriminating circuit for discriminating data `1` from peaks of a waveform reproduced by the head. The phase discriminating circuit has a differential circuit for differentiating the waveform, a pulse circuit for producing a zero cross pulse from a zero-level crossing point of the differentiated waveform, a discriminating circuit for discriminating `1` and `0` of the data with use of pulses output from the pulse circuit and a discriminating window needed for judgment of `1` and `0` of the data, and a decoding circuit for decoding and feeding out the data output of the discriminating circuit. The head comprises a recording head of inductive type, and a reproducing head of magnetoresistive type. The phase discriminating circuit comprises a circuit for controlling a magnetic bias level for the magnetoresistive reproducing head so that a change of resistance of the magnetoresistive reproducing head due to magnetic field is made virtually equal both at positive and negative polarity waveform peaks.

摘要翻译： 一种磁记录和再现装置，包括磁记录介质，用于在包括感应记录头和磁阻再现头的磁记录介质上读取数据或写入数据的磁头装置，以及用于区分数据“1”的相位鉴别电路， 从由头部再现的波形的峰值。 相位鉴别电路具有用于微分波形的差分电路，用于从微分波形的零电平交叉点产生零交叉脉冲的脉冲电路，用于用数据的“1”和“0”区分数据的鉴别电路， 使用从脉冲电路输出的脉冲和用于判断数据的“1”和“0”所需的识别窗口，以及解码电路，用于解码和输出鉴别电路的数据输出。 头部包括感应型记录头和磁阻型再现头。 相位识别电路包括用于控制用于磁阻再现头的磁偏置电平的电路，使得由于磁场引起的磁阻再现头的电阻的变化在正负极性波形峰值上几乎相等。

公开(公告)号：US5083226A

公开(公告)日：1992-01-21

申请号：US410495

申请日：1989-09-21

申请人： Kazuo Shiiki ,  Yoshihiro Shiroishi ,  Norio Ohta ,  Toshiaki Tsuyoshi ,  Hisashi Takano ,  Fumio Kugiya

发明人： Kazuo Shiiki ,  Yoshihiro Shiroishi ,  Norio Ohta ,  Toshiaki Tsuyoshi ,  Hisashi Takano ,  Fumio Kugiya

IPC分类号： G11B5/596 ,  G11B5/82

CPC分类号： G11B5/82 ,  G11B5/596 ,  G11B5/59683

摘要： A magnetic-disk drive includes: a magnetic disk having a ridge pattern consisting of at least one ridge extending in the circumferential direction; a recording/reproduction head arranged over the surface of the magnetic disk and having a track width larger than the width of the ridge of the pattern and smaller than the pattern pitch; a device for rotating the magnetic disk; and a recording/reproduction circuit.

摘要翻译： 磁盘驱动器包括：磁盘，其具有由沿圆周方向延伸的至少一个脊的脊图形; 记录/再现头，布置在磁盘的表面上，并且具有比图案的脊的宽度大于图案间距的轨道宽度; 用于旋转磁盘的装置; 和记录/再现电路。

公开(公告)号：US6069762A

公开(公告)日：2000-05-30

申请号：US350139

申请日：1999-07-09

申请人： Hajime Aoi ,  Toshiaki Tsuyoshi ,  Makoto Koizumi ,  Nobumasa Nishiyama ,  Yoshibumi Matsuda ,  Takuji Ogawa ,  Kazuhisa Shiraishi

发明人： Hajime Aoi ,  Toshiaki Tsuyoshi ,  Makoto Koizumi ,  Nobumasa Nishiyama ,  Yoshibumi Matsuda ,  Takuji Ogawa ,  Kazuhisa Shiraishi

IPC分类号： G11B5/02 ,  G11B5/00 ,  G11B5/012 ,  G11B5/09 ,  G11B5/39 ,  G11B5/40 ,  G11B5/55 ,  G11B5/596 ,  G11B19/02 ,  G11B19/04 ,  G11B27/30 ,  G11B27/36 ,  G11B15/12 ,  G11B5/127

CPC分类号： G11B19/04 ,  G11B19/02 ,  G11B27/3027 ,  G11B27/36 ,  G11B5/00 ,  G11B5/012 ,  G11B5/40 ,  G11B5/5547 ,  G11B2005/0016 ,  G11B2005/0018 ,  G11B5/59683

摘要： In a magnetic recording drive having a plurality of magnetic heads each employing a magnetoresistive sensor for the purpose of averaging the time required for sense currents to be caused to flow through the respective magnetoresistive sensors to shorten the longest reproducing time and to suppress the degradation of the characteristics due to the electromigration, thereby improving the reliability of the magnetic recording drive, the magnetic recording drive includes circuits for averaging the useful life depending on the currents caused to flow through the respective magnetoresistive sensors among the plurality of magnetic heads, whereby the time required for the sense current to be caused to flow through one MR reproducing head is greatly shortened. Therefore, the levels of outputs of the MR reproducing heads can be increased without reduction of the reliability and thus the reliability of the magnetic recording drive can be improved.

摘要翻译： 在具有多个磁头的磁记录驱动器中，每个磁头采用磁阻传感器，用于平均要使感应电流流过各磁阻传感器所需的时间，以缩短最长再现时间并抑制 由于电迁移的特性，从而提高了磁记录驱动器的可靠性，磁记录驱动器包括用于根据流过多个磁头中的相应磁阻传感器的电流来平均使用寿命的电路，由此所需的时间 使得通过一个MR再现头流动的感测电流大大缩短。 因此，可以在不降低可靠性的情况下增加MR再现头的输出电平，从而可以提高磁记录驱动器的可靠性。

公开(公告)号：US5193034A

公开(公告)日：1993-03-09

申请号：US551808

申请日：1990-07-12

申请人： Toshiaki Tsuyoshi ,  Yosuke Seo ,  Hajime Aoi ,  Makoto Saito

发明人： Toshiaki Tsuyoshi ,  Yosuke Seo ,  Hajime Aoi ,  Makoto Saito

IPC分类号： G11B5/596 ,  G11B20/12 ,  G11B27/30

CPC分类号： G11B5/59633 ,  G11B20/1217 ,  G11B20/1258 ,  G11B27/3027 ,  G11B2020/1282 ,  G11B2220/20 ,  G11B5/59655

摘要： A constant-density type of magnetic disk apparatus is made up of a plurality of magnetic disks, wherein at least one of the surfaces of the magnetic disks is a servo face divided into a plurality of zones in the radial direction of the disks. A magnetic disk used in this apparatus and a servo-writing device for making this magnetic disk are also disclosed. In the magnetic disk apparatus and the magnetic disk, servo information regions and clock information regions are alternately provided on the servo face in the circumferential direction of the disks. The servo information regions are arranged radially with respect to the rotation center of the disks and each of the clock information regions includes a plurality of magnetic transitions representative of clocks, the number of which is different for each of the divided zones. A servo PLL circuit is provided to generate a servo clock signal on the basis of the signal reproduced from each of the servo information regions, and a write PLL is also provided to generate a write clock signal on the basis of the signal reproduced from each of the clock information regions. Also disclosed is a disk for use in a constant density-recording type magnetic disk apparatus, wherein a dummy track is provided along a zone boundary on the data face embedded with servo patterns of the disk.

摘要翻译： 恒定密度型的磁盘装置由多个磁盘构成，其中磁盘的至少一个表面是在盘的径向方向上分成多个区域的伺服面。 本发明还公开了一种用于本装置的磁盘和用于制造该磁盘的伺服写入装置。 在磁盘装置和磁盘中，伺服信息区域和时钟信息区域在盘的圆周方向上的伺服面上交替地设置。 伺服信息区域相对于盘的旋转中心径向地布置，并且每个时钟信息区域包括表示每个分割区域的数量不同的多个时钟的磁跃迁。 提供伺服PLL电路以根据从每个伺服信息区再现的信号产生伺服时钟信号，并且还提供写入PLL以根据从每个伺服信息区再现的信号来产生写入时钟信号 时钟信息区。 还公开了一种在恒定密度记录型磁盘装置中使用的盘，其中沿着镶嵌有盘的伺服图案的数据面上的区域边界设置虚拟轨道。

公开(公告)号：US07394607B2

公开(公告)日：2008-07-01

申请号：US11517190

申请日：2006-09-06

申请人： Jun Ohno ,  Hiroyasu Tanabe ,  Noboru Suzuki ,  Toshiaki Tsuyoshi

发明人： Jun Ohno ,  Hiroyasu Tanabe ,  Noboru Suzuki ,  Toshiaki Tsuyoshi

IPC分类号： G11B15/04 ,  G11B21/02 ,  G11B5/596

CPC分类号： G11B5/59627

摘要： Embodiments of the invention provide a disk drive capable of writing information on data tracks even more positively when a shingle write method is adopted. In one embodiment, the disk drive is characterized in that, when information is to be written on a plurality of adjacent data tracks on a recording medium through the shingle write method, writing of information is controlled by detecting an actual writing position based on servo information recorded on the recording medium and determining whether or not the detected actual writing position meets a predetermined condition.

摘要翻译： 本发明的实施例提供了一种能够在采用瓦楞写入方法时更有效地将信息写入数据轨道的磁盘驱动器。 在一个实施例中，磁盘驱动器的特征在于，当通过瓦板写入方法将信息写入记录介质上的多个相邻数据磁道时，通过基于伺服信息检测实际写入位置来控制信息的写入 记录在记录介质上并确定检测到的实际写入位置是否满足预定条件。