公开(公告)号：US06815098B2

公开(公告)日：2004-11-09

申请号：US10411299

申请日：2003-04-11

申请人： Satoshi Matsunuma ,  Akira Yano ,  Tsuyoshi Onuma ,  Takanobu Takayama ,  Harumi Hieida ,  Kouichirou Wakabayashi

发明人： Satoshi Matsunuma ,  Akira Yano ,  Tsuyoshi Onuma ,  Takanobu Takayama ,  Harumi Hieida ,  Kouichirou Wakabayashi

IPC分类号： G11B566

CPC分类号： G11B5/00 ,  G11B5/012 ,  G11B5/66 ,  G11B5/74 ,  G11B5/851 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12868 ,  Y10T428/265

摘要： A magnetic recording medium comprises, on a substrate, a soft magnetic layer, a first seed layer, a second seed layer, and a recording layer having an artificial lattice structure. The first seed layer contains oxide of Fe. The second seed layer contains one of Pd and Pt, Si, and N. The magnetic exchange coupling force in the in-plane direction of the recording layer is weakened by the first seed layer and the second seed layer. Accordingly, minute recording magnetic domains can be formed in the recording layer, and the magnetization transition area is distinct as well. Even when information is recorded at a high density, the information can be reproduced with low noise. A magnetic storage apparatus, which is provided with such a magnetic recording medium, makes it possible to achieve an areal recording density of 150 gigabits/square inch.

摘要翻译： 磁记录介质在基板上包括软磁层，第一晶种层，第二晶种层和具有人造晶格结构的记录层。 第一种子层含有Fe的氧化物。 第二种子层包含Pd和Pt，Si和N中的一个。记录层的面内方向上的磁交换耦合力被第一种子层和第二种子层削弱。 因此，可以在记录层中形成分钟记录磁畴，并且磁化过渡区也是不同的。 即使当以高密度记录信息时，可以以低噪声再现信息。 具有这种磁记录介质的磁存储装置使得可以实现150吉比特/平方英寸的面积记录密度。

公开(公告)号：US5786952A

公开(公告)日：1998-07-28

申请号：US562203

申请日：1995-11-22

申请人： Masuo Umemoto ,  Yoshihiro Shiroishi ,  Reijiro Tsuchiya ,  Kyo Akagi ,  Takehiko Hamaguchi ,  Takashi Kawabe ,  Atsushi Saito ,  Kouichirou Wakabayashi

发明人： Masuo Umemoto ,  Yoshihiro Shiroishi ,  Reijiro Tsuchiya ,  Kyo Akagi ,  Takehiko Hamaguchi ,  Takashi Kawabe ,  Atsushi Saito ,  Kouichirou Wakabayashi

IPC分类号： G11B5/012 ,  G11B5/035 ,  G11B5/09 ,  G11B5/48 ,  G11B5/49 ,  G11B5/55 ,  G11B5/596 ,  G11B20/10

CPC分类号： G11B5/59633 ,  G11B20/10009 ,  G11B5/012 ,  G11B5/09 ,  G11B5/4886 ,  G11B5/4976 ,  G11B5/5526 ,  G11B5/035

摘要： A magnetic digital storage method and system which can improve a recording density and can reduce a cross-talk upon reproducing. An inputted high-speed digital signal is converted to a plurality of low-speed digital signal sequences by a recording circuit and each of the low-speed signal sequence is recorded onto a plurality of adjacent recorded tracks of a recording medium by integrated parallel recording heads. One servo signal is commonly recorded to the plurality of recorded tracks. Further, when recording the digital signal to the adjacent recorded tracks of the recording medium, a delay of a signal that is applied to each recording head is adjusted such that the phases of magnetic transition points given by the recording signal in the adjacent recorded tracks are not identical in the circumferential direction.

摘要翻译： 一种磁数字存储方法和系统，其可以提高记录密度并且可以在再现时减少串扰。 输入的高速数字信号通过记录电路转换成多个低速数字信号序列，并且每个低速信号序列通过集成并行记录头记录在记录介质的多个相邻的记录磁道上 。 一个伺服信号通常记录到多个记录的轨道。 此外，当将数字信号记录到记录介质的相邻记录磁道时，调整施加到每个记录头的信号的延迟，使得由相邻记录磁道中的记录信号给出的磁转变点的相位为 在圆周方向上不相同。

公开(公告)号：US5774444A

公开(公告)日：1998-06-30

申请号：US533991

申请日：1995-09-27

申请人： Takeshi Shimano ,  Kimio Tatsuno ,  Kouichirou Wakabayashi ,  Takeshi Maeda ,  Hisataka Sugiyama

发明人： Takeshi Shimano ,  Kimio Tatsuno ,  Kouichirou Wakabayashi ,  Takeshi Maeda ,  Hisataka Sugiyama

IPC分类号： G11B7/005 ,  G11B7/013 ,  G11B7/09 ,  G11B7/13 ,  G11B7/135 ,  G11B7/14 ,  G11B11/105 ,  G11B7/12

CPC分类号： B82Y10/00 ,  G11B11/10545 ,  G11B11/10584 ,  G11B7/0943 ,  G11B7/133 ,  G11B7/1365 ,  G11B7/1395 ,  G11B7/005 ,  G11B7/013 ,  G11B7/14 ,  G11B7/24088

摘要： An optical information reproducing method, for optically reproducing information recorded on a recording medium, irradiates the recording medium with a laser beam and detects the light returning from the recording medium. When the diffracted light returning from the recording medium is detected, the optical intensity distribution of the diffracted light is detected by a plurality of detectors to produce a plurality of signals, and the signals are calculated to produce a reproduced signal for detecting the information.

摘要翻译： 一种用于光学地再现记录在记录介质上的信息的光学信息再现方法，用激光束照射记录介质并检测从记录介质返回的光。 当检测到从记录介质返回的衍射光时，由多个检测器检测衍射光的光强度分布，以产生多个信号，并且计算这些信号以产生用于检测信息的再现信号。

公开(公告)号：US06970400B1

公开(公告)日：2005-11-29

申请号：US09671478

申请日：2000-09-27

申请人： Kouichirou Wakabayashi ,  Tsuyoshi Onuma ,  Teruaki Takeuchi ,  Nobuyuki Inaba ,  Fumiyoshi Kirino

发明人： Kouichirou Wakabayashi ,  Tsuyoshi Onuma ,  Teruaki Takeuchi ,  Nobuyuki Inaba ,  Fumiyoshi Kirino

IPC分类号： G11B5/00 ,  G11B5/012 ,  G11B5/48 ,  G11B5/55 ,  G11B5/596 ,  G11B5/74 ,  G11B5/82 ,  G11B11/00 ,  G11B13/04

CPC分类号： G11B13/045 ,  G11B5/012 ,  G11B5/488 ,  G11B5/5526 ,  G11B5/59677 ,  G11B5/74 ,  G11B5/82 ,  G11B2005/0002 ,  G11B2005/0005 ,  G11B2005/0021

摘要： A recording and reproducing apparatus including a recording magnetic head and a reproducing magnetic head with their floating height lowered for high density recordation and reproduction is provided. An information recording medium is provided on which it is possible to densely record information and from which it is possible to densely reproduce information by lowering the floating height of the recording and reproducing heads. The information recording medium includes a flat substrate and a recording layer provided on the substrate. Servo patterns and management information are recorded as magnetic marks on the recording layer in advance by a servo writer or the like. Because the substrate needs no recessed and embossed patterns formed in it, the slider of the recording and reproducing apparatus can be floated at a constant floating height lower than conventionally over the whole area of the medium. During information recordation, the position of the slider is controlled on the basis of the magneto-optical signals from the magnetic marks. During information reproduction, the reproducing magnetic head controls the slider position on the basis of the magnetic leakage fields leaking from the magnetic marks.

摘要翻译： 提供包括记录磁头和其浮动高度降低以用于高密度记录和再现的再现磁头的记录和再现装置。 提供一种信息记录介质，在该信息记录介质上可以密集地记录信息，并且可以通过降低记录和再现磁头的浮动高度从而可以密集地再现信息。 信息记录介质包括平坦基板和设置在基板上的记录层。 伺服模式和管理信息通过伺服写入器等预先记录在记录层上作为磁标记。 因为基板不需要在其中形成凹陷和压花图案，所以记录和再现装置的滑动件可以浮动在比传统的介质整个区域以下的恒定浮动高度。 在信息记录期间，滑块的位置是根据来自磁痕的磁光信号进行控制的。 在信息再现期间，再现磁头基于从磁痕泄漏的磁泄漏场来控制滑块位置。

公开(公告)号：US06730421B1

公开(公告)日：2004-05-04

申请号：US09959855

申请日：2001-11-09

申请人： Fumiyoshi Kirino ,  Nobuyuki Inaba ,  Teruaki Takeuchi ,  Kouichirou Wakabayashi

发明人： Fumiyoshi Kirino ,  Nobuyuki Inaba ,  Teruaki Takeuchi ,  Kouichirou Wakabayashi

IPC分类号： G11B566

CPC分类号： G11B5/667 ,  G11B5/72 ,  G11B5/732 ,  G11B5/7325 ,  G11B5/8404 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12854 ,  Y10T428/265

摘要： A magnetic recording medium (300) includes a substrate (1) and on the substrate (1) a first underlying layer (32), a second underlying layer (33), a magnetic layer (34), and a protective layer (35). Because of the existence of the first underlying layer (32) of Hf, initial growth layer having no specific crystal structure is prevented from growing in the second underlying layer (33). The second underlying layer (33) has a structure in which CoO particles having a cross section of a regular hexagon and separated by SiO2 portion are arranged in honeycomb. Since magnetic particles are epitaxially grown from CoO particles, the size of the magnetic particles and particle size distribution can be controlled, and the magnetic interaction between magnetic particles can be lessened. The underlying layer (33) and the protective layer (35) are formed by ECR sputtering. Such a magnetic recording medium is free from noise and thermal fluctuation, and ultrahigh recording density over 40 Gbit/inch2 is realized.

摘要翻译： 磁记录介质（300）包括基板（1）和基板（1）上的第一下层（32），第二下层（33），磁性层（34）和保护层（35） 。 由于Hf的第一下层（32）的存在，防止了在第二下层（33）中不具有特定晶体结构的初始生长层。 第二基底层（33）具有其中具有正六边形横截面并由SiO 2部分分离的CoO颗粒被布置成蜂巢状的结构。 由于磁性颗粒从CoO颗粒外延生长，因此可以控制磁性颗粒的尺寸和颗粒尺寸分布，并且可以减小磁性颗粒之间的磁性相互作用。 通过ECR溅射形成下层（33）和保护层（35）。 这样的磁记录介质没有噪声和热波动，并且实现超过40Gbit / inch 2的超高记录密度。

公开(公告)号：US06552977B2

公开(公告)日：2003-04-22

申请号：US10074049

申请日：2002-02-14

申请人： Kouichirou Wakabayashi ,  Hirofumi Sukeda

发明人： Kouichirou Wakabayashi ,  Hirofumi Sukeda

IPC分类号： G11B7005

CPC分类号： G11B20/10009

摘要： An information reproducing apparatus for reproducing information of information marks by scanning information marks recorded on tracks inside a predetermined information recording region by an optical spot, the apparatus includes a driving device, an optical head, a head driving device, a laser driving device, an automatic gain control circuit, a non-linear equalization circuit, a phase locked loop circuit, a data demodulation circuit, and a control circuit.

摘要翻译： 一种信息再现装置，用于通过扫描通过光点记录在预定信息记录区域内的轨道上的信息标记来再现信息标记的信息，该装置包括驱动装置，光学头，头驱动装置，激光驱动装置， 自动增益控制电路，非线性均衡电路，锁相环电路，数据解调电路和控制电路。

公开(公告)号：US07079457B2

公开(公告)日：2006-07-18

申请号：US10715378

申请日：2003-11-19

申请人： Kouichirou Wakabayashi ,  Hirofumi Sukeda

发明人： Kouichirou Wakabayashi ,  Hirofumi Sukeda

IPC分类号： G11B7/05

CPC分类号： G11B20/10009

摘要： A method of reproducing information by scanning information marks, disposed with a predetermined mark pitch therebetween and recorded on tracks inside a predetermined information recording region, by an optical spot. The method includes detecting the size of the optical change resulting from the information mark, calculating a plurality of equalization coefficients used for an equalization processing for the size of the optical change detected for each of the information marks, and reducing the inter-symbol interference on the basis of the equalization coefficients by the equalization processing. The equalization coefficient used for the equalization processing of the size of the optical change by a first information mark is greater than said equalization coefficient used for the equalization processing of the size of said optical change by a second information mark which is longer than the first information mark.

公开(公告)号：US06893746B1

公开(公告)日：2005-05-17

申请号：US10111608

申请日：2000-10-30

申请人： Fumiyoshi Kirino ,  Norio Ohta ,  Kouichirou Wakabayashi ,  Teruaki Takeuchi ,  Harumi Hieida ,  Masaki Sekine ,  Hiroyuki Awano ,  Akira Yano ,  Satoshi Matsunuma ,  Nobuyuki Inaba ,  Tetsunori Koda

发明人： Fumiyoshi Kirino ,  Norio Ohta ,  Kouichirou Wakabayashi ,  Teruaki Takeuchi ,  Harumi Hieida ,  Masaki Sekine ,  Hiroyuki Awano ,  Akira Yano ,  Satoshi Matsunuma ,  Nobuyuki Inaba ,  Tetsunori Koda

IPC分类号： G11B5/00 ,  G11B5/64 ,  G11B5/66 ,  G11B5/74 ,  G11B5/82 ,  G11B5/70 ,  G11B11/105

CPC分类号： G11B5/65 ,  G11B5/00 ,  G11B5/656 ,  G11B5/66 ,  G11B5/667 ,  G11B5/7325 ,  G11B5/74 ,  G11B5/82 ,  G11B2005/0002 ,  G11B2005/0005 ,  G11B2005/0021

摘要： A magnetic recording medium comprises an information-recording film and a ferromagnetic film on a substrate. The information-recording film is composed of, for example, an amorphous ferrimagnetic material having perpendicular magnetization. Further, the ferromagnetic film is composed of a magnetic material which has saturation magnetization larger than that of the information-recording film. Accordingly, the leak magnetic flux from the ferromagnetic film is larger than that from the information-recording film. The magnetic recording medium and a magnetic recording apparatus are obtained, which are excellent in thermal stability and which are preferred to perform super high density recording.

摘要翻译： 磁记录介质包括在基板上的信息记录膜和铁磁膜。 信息记录膜由例如具有垂直磁化的非晶铁磁材料构成。 此外，铁磁膜由具有比信息记录膜的饱和磁化强度大的饱和磁化强度的磁性材料构成。 因此，来自铁磁膜的泄漏磁通量大于来自信息记录膜的漏磁通量。 获得磁性记录介质和磁记录装置，其热稳定性优异，并且优选进行超高密度记录。

公开(公告)号：US06674594B1

公开(公告)日：2004-01-06

申请号：US10031338

申请日：2002-01-25

申请人： Kouichirou Wakabayashi ,  Teruaki Takeuchi ,  Nobuyuki Inaba

发明人： Kouichirou Wakabayashi ,  Teruaki Takeuchi ,  Nobuyuki Inaba

IPC分类号： G11B502

CPC分类号： G11B5/127 ,  G11B5/00 ,  G11B5/012 ,  G11B5/3103 ,  G11B5/3967 ,  G11B5/4886 ,  G11B5/596 ,  G11B5/59627 ,  G11B5/59655 ,  G11B5/59683 ,  G11B13/045 ,  G11B2005/0002 ,  G11B2005/0005 ,  G11B2005/0021

摘要： A magnetic recording apparatus includes a laser light source (132), a recording magnetic head (131) and a magnetoresistive element. The recording magnetic head includes a pair of magnetic poles (100 and 101), between which the magnetoresistive element is interposed. A rotary actuator (Sa) positions the recording magnetic head at a desired track of a magnetic recording medium. A laser beam can be radiated onto the magnetic recording medium to raise the temperature of a region (302) of the medium. This region has a width of the order of the track width. The raised temperature lowers the coercive force of this region, where a recording magnetic field can be applied for high density recording. The rotary actuator may form a yaw angle (&thgr;) with a track of the magnetic recording medium. Even in this case, the recording magnetic head (131) and the reproducing element have no tracking offset from the code track. In addition, if the size of the magnetic poles (100 and 101) of the recording magnetic head are set within a predetermined range, the region (302) heated by the laser beam does not deviate from a recording magnetic field application region (303).

摘要翻译： 磁记录装置包括激光源（132），记录磁头（131）和磁阻元件。 记录磁头包括一对磁极（100和101），磁阻元件插在其间。 旋转致动器（Sa）将记录磁头定位在磁记录介质的期望轨道处。 可以将激光束照射到磁记录介质上以升高介质的区域（302）的温度。 该区域具有轨道宽度顺序的宽度。 升高的温度降低了该区域的矫顽力，其中可以应用记录磁场用于高密度记录。 旋转致动器可以与磁记录介质的轨道形成偏航角（θ）。 即使在这种情况下，记录磁头（131）和再现元件也没有跟踪轨迹的跟踪偏移。 此外，如果将记录磁头的磁极（100和101）的尺寸设定在预定范围内，则由激光束加热的区域（302）不会偏离记录磁场施加区域（303） 。

公开(公告)号：US06567348B1

公开(公告)日：2003-05-20

申请号：US09433021

申请日：1999-11-03

申请人： Kouichirou Wakabayashi ,  Masafumi Yoshihiro ,  Manabu Tani

发明人： Kouichirou Wakabayashi ,  Masafumi Yoshihiro ,  Manabu Tani

IPC分类号： G11B1100

CPC分类号： G11B11/10528 ,  G11B11/10513 ,  G11B11/10515 ,  G11B11/10595 ,  G11B20/1426

摘要： When recording marks having various lengths are recorded to represent information on a magneto-optical recording medium, a mark length-correcting circuit is used to correct a mark length nT with a mark length correction amount Lc determined for each mark length so that the recording is performed with a shorter mark length nT′=nT−Lc. When reproduction is performed on the magneto-optical recording medium, an appropriate reproducing light power and an appropriate reproducing magnetic field intensity can be easily selected for any recording mark having any length. Thus, the reproducing power margin is widened. The recording method is effective on a magneto-optical recording medium of the MAMMOS type comprising a recording layer and a reproducing layer, in which the light and the magnetic field are applied during the reproduction to transfer a magnetic domain from the recording layer to the reproducing layer in a magnified form.

摘要翻译： 当记录具有各种长度的记录标记以表示关于磁光记录介质的信息时，使用标记长度校正电路来校正标记长度nT，并以每个标记长度确定标记长度校正量Lc，使得记录是 以较短的标记长度nT'= nT-Lc执行。 当对磁光记录介质进行再现时，可以容易地为任何长度的任何记录标记选择适当的再现光功率和适当的再现磁场强度。 因此，再现功率余量变宽。 记录方法在包括记录层和再现层的MAMMOS类型的磁光记录介质上有效，其中在再现期间施加光和磁场以将磁畴从记录层传送到再现 层以放大的形式。