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21. 发明授权

US5325244A Magnetic recording data storage system 失效
标题翻译：磁记录数据存储系统
公开(公告)号：US5325244A
公开(公告)日：1994-06-28
申请号：US843265
申请日：1992-02-28
申请人： Hisashi Takano , Kyo Akagi , Mikio Suzuki , Yoshibumi Matsuda , Takeshi Nakao , Yoshinori Miyamura , Fumio Kugiya , Masaaki Futamoto , Hideki Sawaguchi , Nobuyuki Inaba , Takayuki Munemoto , Kenji Mori , Hirotsugu Fukuoka , Tokuho Takagaki
发明人： Hisashi Takano , Kyo Akagi , Mikio Suzuki , Yoshibumi Matsuda , Takeshi Nakao , Yoshinori Miyamura , Fumio Kugiya , Masaaki Futamoto , Hideki Sawaguchi , Nobuyuki Inaba , Takayuki Munemoto , Kenji Mori , Hirotsugu Fukuoka , Tokuho Takagaki
IPC分类号： G11B5/02 , G11B5/00 , G11B5/39 , G11B5/55 , G11B5/596 , G11B5/60 , G11B5/65 , G11B5/66 , G11B5/74 , G11B5/82 , G11B13/04 , G11B21/10 , G11B5/58
CPC分类号： G11B5/3967 , G11B5/00 , G11B5/5552 , G11B5/59677 , G11B5/6005 , G11B5/74
摘要： A magnetic recording data storage system includes a magnetic recording medium having pits formed therein, the pits defining recording tracks on the magnetic recording medium and being arranged in a staggered manner relative to respective center lines of the recording tracks, a magnetic head including an inductive element for recording data on the recording tracks and a magnetoresistive element for reproducing data from the recording tracks, one of (1) a unit for magnetically producing a signal from the pits, and (2) an optical unit for optically producing a signal from the pits, the optical unit including a laser for illuminating the pits, servo means for positioning the head on the recording tracks based on the signal produced from the pits, the servo means including a dual-stage actuator including a rough movement portion and a fine movement portion.
摘要翻译：磁记录数据存储系统包括其中形成有凹坑的磁记录介质，凹坑在磁记录介质上定义记录轨道并相对于记录轨道的相应中心线以交错方式布置，磁头包括电感元件用于在记录磁道上记录数据和用于从记录磁道再现数据的磁阻元件，（1）用于从凹坑中产生信号的单元，以及（2）用于光学地产生来自凹坑的信号的光学单元所述光学单元包括用于照亮所述凹坑的激光器，用于基于由所述凹坑产生的信号将所述磁头定位在所述记录磁道上的伺服装置，所述伺服装置包括双级致动器，所述双级致动器包括粗略运动部分和精细运动部分。

22. 发明授权

US07526716B2 Recording/regenerating device, method of encoding error correction, method of recording data 失效
标题翻译：记录/再生装置，纠错编码方法，记录数据的方法
公开(公告)号：US07526716B2
公开(公告)日：2009-04-28
申请号：US11094019
申请日：2005-03-30
申请人： Masaharu Kondou , Hideki Sawaguchi
发明人： Masaharu Kondou , Hideki Sawaguchi
IPC分类号： H03M13/03
CPC分类号： H03M13/132 , H03M13/153 , H03M13/1575
摘要： Embodiment of the invention is to make the number of interleave sequences and the number of redundant bits as small as possible without increasing the number of bits per symbol so much. By encoding data into an error-correcting code by using an algebraic geometric code consisting of an algebraic curve surface having a genus g over a projective plane Pc−1(GF(2m)), where m is a positive integer, the code up to a length of 2m+21+m/2 g is constructed. In particular, by using a “Fermat code,” a version of the algebraic geometric code, consisting of a Fermat curve “C(L): XL+YL+ZL=0” over the P2(GF(22m)), where (m, L)=(5, 11), 4-Kbyte data constituting one sector can be encoded into the code made up of 10-bit symbols.
摘要翻译：本发明的实施例是使交织序列的数量和冗余比特的数量尽可能小，而不增加每个符号的比特数。通过使用由投影平面Pc-1（GF（2m））上的g类的代数曲线表示的代数几何代码将数据编码成纠错码，其中m是正整数，代码直到构建2m + 21 + m / 2g的长度。特别地，通过使用代码几何代码的版本，由P2（GF（22m））上的费马曲线“C（L）：XL + YL + ZL = 0”）组成，其中（ m，L）=（5,11），构成一个扇区的4K字节数据可以被编码成由10位符号组成的码。

23. 发明授权

US07502189B2 Apparatus, signal-processing circuit and device for magnetic recording system 有权
公开(公告)号：US07502189B2
公开(公告)日：2009-03-10
申请号：US09940475
申请日：2001-08-29
申请人： Hideki Sawaguchi , Yasutaka Nishida , Hisashi Takano , Hiroyuki Tsuchinaga
发明人： Hideki Sawaguchi , Yasutaka Nishida , Hisashi Takano , Hiroyuki Tsuchinaga
IPC分类号： G11B5/35
CPC分类号： G11B20/10009 , G11B5/09 , G11B20/10203 , G11B2005/0016 , G11B2005/0029
摘要： To effectively suppress a signal in a low frequency region in which the medium noise and the signal distortion are concentrated, and in order to effectively utilize a detected component of the reproduced signal in the low frequency region, a target of partial response equalization to the perpendicularly recorded/reproduced signal is set so that the low-frequency component around the direct current is suppressed to a regulated quantity for both the effective suppression and the effective utilization. Accordingly, a maximum-likelihood decoding process is carried out through the target of partial response equalization. Reliability of data detection is made higher and a signal-to-noise ratio is improved, so that the noise from the recording medium can be reduced more and it is possible to provide a high-density magnetic recording/reproducing apparatus.

24. 发明申请

US20090021852A1 Apparatus, signal-processing circuit and device for magnetic recording system 有权
公开(公告)号：US20090021852A1
公开(公告)日：2009-01-22
申请号：US12232435
申请日：2008-09-17
申请人： Hideki Sawaguchi , Yasutaka Nishida , Hisashi Takano , Hiroyuki Tsuchinaga
发明人： Hideki Sawaguchi , Yasutaka Nishida , Hisashi Takano , Hiroyuki Tsuchinaga
IPC分类号： G11B5/09
CPC分类号： G11B20/10009 , G11B5/09 , G11B20/10203 , G11B2005/0016 , G11B2005/0029
摘要： To effectively suppress a signal in a low frequency region in which the medium noise and the signal distortion are concentrated, and in order to effectively utilize a detected component of the reproduced signal in the low frequency region, a target of partial response equalization to the perpendicularly recorded/reproduced signal is set so that the low-frequency component around the direct current is suppressed to a regulated quantity for both the effective suppression and the effective utilization. Accordingly, a maximum-likelihood decoding process is carried out through the target of partial response equalization. Reliability of data detection is made higher and a signal-to-noise ratio is improved, so that the noise from the recording medium can be reduced more and it is possible to provide a high-density magnetic recording/reproducing apparatus.

25. 发明授权

US07213195B2 Data decoding method and circuit and information recording and reproducing apparatus using the same 有权
标题翻译：数据解码方法及使用其的电路和信息记录和再现装置
公开(公告)号：US07213195B2
公开(公告)日：2007-05-01
申请号：US11339574
申请日：2006-01-26
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 occurrence, 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。

26. 发明申请

US20060187578A1 Magnetic disk drive 有权
公开(公告)号：US20060187578A1
公开(公告)日：2006-08-24
申请号：US11404780
申请日：2006-04-17
申请人： Takehiko Hamaguchi , Atsushi Nakamura , Yasutaka Nishida , Hisashi Takano , Yohji Maruyama , Hiroshi Ide , Hideki Sawaguchi , Futoshi Tomiyama
发明人： Takehiko Hamaguchi , Atsushi Nakamura , Yasutaka Nishida , Hisashi Takano , Yohji Maruyama , Hiroshi Ide , Hideki Sawaguchi , Futoshi Tomiyama
IPC分类号： G11B17/00
CPC分类号： G11B5/012 , G11B5/4886 , G11B27/02
摘要： For the purpose of letting through a magnetic flux which reverses the magnetization of the magnetic layer of the magnetic disk, a write element requires a predetermined sectional area. However, if a cross section of a magnetic pole is structured as the one having a large aspect ratio, the pole becomes less capable of letting the magnetic flux through effectively. This phenomenon brings about a lower limit on the track width of the magnetic poles and the track density cannot be raised. In the present invention, by making the width of the write element larger than the track pitch and securing a write magnetic field strong enough to reverse the magnetization of the magnetic layer, and further by writing while shifting a write head comprising the write element, a magnetic disk drive, of which the track width is narrower than the write element width, and the storage capacity is large, is realized.

27. 发明申请

US20050216818A1 Recording/regenerating device, method of encoding error correction, method of recording data 失效
标题翻译：记录/再生装置，纠错编码方法，记录数据的方法
公开(公告)号：US20050216818A1
公开(公告)日：2005-09-29
申请号：US11094019
申请日：2005-03-30
申请人： Masaharu Kondou , Hideki Sawaguchi
发明人： Masaharu Kondou , Hideki Sawaguchi
IPC分类号： G11B20/18 , H03M13/13 , H03M13/15 , H04L1/00
CPC分类号： H03M13/132 , H03M13/153 , H03M13/1575
摘要： Embodiment of the invention is to make the number of interleave sequences and the number of redundant bits as small as possible without increasing the number of bits per symbol so much. By encoding data into an error-correcting code by using an algebraic geometric code consisting of an algebraic curve surface having a genus g over a projective plane Pc−1(GF(2m)), where m is a positive integer, the code up to a length of 2m+21+m/2 g is constructed. In particular, by using a “Fermat code,” a version of the algebraic geometric code, consisting of a Fermat curve “C(L): XL+YL+ZL=0” over the P2(GF(22m)), where (m, L)=(5, 11), 4-Kbyte data constituting one sector can be encoded into the code made up of 10-bit symbols.
摘要翻译：本发明的实施例是使交织序列的数量和冗余比特的数量尽可能小，而不增加每个符号的比特数。通过使用代数几何代码将数据编码成错误校正码，该代数几何代码由在投影平面P c-1之间具有类别g的代数曲线表面（GF（2m / >）），其中m是正整数，构建长达2m 2 + 2 + 1 / m 2/2的长度的码。特别地，通过使用“费马代码”，代码几何代码的版本，由费马曲线“C”（L）组成：X + Y

28. 发明申请

US20050044468A1 Signal processing method and signal processing circuit 有权
标题翻译：信号处理方法和信号处理电路
公开(公告)号：US20050044468A1
公开(公告)日：2005-02-24
申请号：US10922227
申请日：2004-08-18
申请人： Morishi Izumita , Terumi Takashi , Hideki Sawaguchi , Seiichi Mita
发明人： Morishi Izumita , Terumi Takashi , Hideki Sawaguchi , Seiichi Mita
IPC分类号： G06F11/10 , G11B20/10 , G11B20/18 , H03M13/11 , H03M13/15 , H03M13/27 , H03M13/29 , H03M13/45 , H03M13/00 , G11C29/00
CPC分类号： H03M13/29 , G11B20/10009 , H03M13/1111 , H03M13/1191 , H03M13/1515 , H03M13/2703 , H03M13/3746 , H03M13/45 , H03M13/6343 , H03M13/6505
摘要： In one embodiment, a symbol error correction encoder effects block interleaving on recording data and thereafter performs first error correction encoding on the recording data. Next, a symbol error correction encoder performs encoding on the whole block. A reproducing processing circuit outputs likelihood information of respective bits. A first error correction decoder corrects a random error produced upon recording and reproduction, using the likelihood information. Since it is possible to make an improvement in performance with respect to the random error by repetitive decoding at this time, the post-correction data is returned to the reproducing processing circuit. After the completion of such repetitive processing, the data is digitized and subjected to an error correction in symbol unit by a hard determination, and outputted to a symbol error correction decoder.
摘要翻译：在一个实施例中，符号纠错编码器在记录数据上实现块交错，并且此后对记录数据执行第一纠错编码。接下来，符号纠错编码器对整个块执行编码。再现处理电路输出各位的似然信息。第一纠错解码器使用似然信息校正记录和再现时产生的随机误差。由于此时可以通过重复解码对随机误差进行性能改善，所以后校正数据返回到再生处理电路。在完成这样的重复处理之后，数据被数字化，并通过硬判断进行符号单位的纠错，并将其输出到符号纠错解码器。

29. 发明授权

US06741412B2 Data recording/reproducing signal processing circuit for magnetic recording, and perpendicular magnetic recording/reproducing apparatus using it 有权
标题翻译：用于磁记录的数据记录/再现信号处理电路和使用它的垂直磁记录/再现装置
公开(公告)号：US06741412B2
公开(公告)日：2004-05-25
申请号：US09875875
申请日：2001-06-08
申请人： Hideki Sawaguchi , Yasutaka Nishida , Hisashi Takano , Toru Matsushita
发明人： Hideki Sawaguchi , Yasutaka Nishida , Hisashi Takano , Toru Matsushita
IPC分类号： G11B509
CPC分类号： G11B5/1278 , G11B5/00 , G11B5/035 , G11B5/09 , G11B5/3912 , G11B5/3967 , G11B20/10 , G11B20/10009 , G11B20/18 , G11B20/24 , G11B2005/0016 , G11B2005/0029
摘要： A magnetic recording/reproducing apparatus includes a partial-response equalization circuit having frequency characteristic of cutting off low-frequency signal components inclusive of DC components; and a maximum-likelihood decoder, in which a reproduced signal outputted from the reproducing head is processed by the partial-response equalization circuit and then inputted into the maximum-likelihood decoder to be data-reproduced, thereby reducing a noise and distortion on the reproduced signal and reducing a data detection error rate.
摘要翻译：磁记录/再现装置包括具有截止包括DC分量的低频信号分量的频率特性的部分响应均衡电路; 以及最大似然解码器，其中从再现头输出的再现信号由部分响应均衡电路处理，然后输入到最大似然解码器中进行数据再现，从而减少再现的噪声和失真信号并降低数据检测错误率。

30. 发明授权

US06310741B1 Magnetic disk apparatus with data track reassigning function 有权
标题翻译：具有数据轨迹重新分配功能的磁盘设备
公开(公告)号：US06310741B1
公开(公告)日：2001-10-30
申请号：US09225972
申请日：1999-01-05
申请人： Yasutaka Nishida , Takehiko Hamaguchi , Hisashi Takano , Hiroshi Ide , Hideki Sawaguchi , Futoshi Tomiyama
发明人： Yasutaka Nishida , Takehiko Hamaguchi , Hisashi Takano , Hiroshi Ide , Hideki Sawaguchi , Futoshi Tomiyama
IPC分类号： G11B509
CPC分类号： G11B19/04 , G11B5/596
摘要： When the amount of position error PE of a magnetic head meets the condition of Ewf>PE>=Eww for two threshold values Ewf and Eww meeting Ewf>Eww, the track is registered in the track information table as a track requiring rewrite and the tracks on both sides neighboring to the track are temporarily write-inhibited. The data of the track is rewritten on another track later so as to maintain the data. By doing this, the offtrack of the recording track can be made smaller without sacrifice of the access speed and the occurrence probability of write fault can be reduced. Furthermore, the reliability of a magnetic disk apparatus can be improved.
摘要翻译：当磁头的位置误差PE的数量满足Ewf> PE> = Eww的两个阈值Ewf和Eww满足Ewf> Eww的条件时，轨道被记录在轨道信息表中作为需要重写的轨道，并且轨道在与轨道相邻的两侧临时禁止写入。轨道的数据稍后被重写在另一个轨道上，以便保持数据。这样做，可以使得记录轨道的远距离更小，而不牺牲访问速度，并且可以减少写入故障的发生概率。此外，可以提高磁盘装置的可靠性。

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