公开(公告)号：WO01008277A1

公开(公告)日：2001-02-01

申请号：PCT/US2000/020721

申请日：2000-07-27

IPC: G02B5/28 ,  G02B6/34 ,  G02B6/42 ,  G02B7/00 ,  G02B26/00 ,  H01S5/022 ,  H01S5/0687 ,  H01S5/14 ,  H04J14/02 ,  H01S3/10 ,  G01B9/02 ,  G02B6/12 ,  G02B27/28 ,  G02F1/01 ,  G02F1/1335 ,  G03B27/44 ,  G11B5/00 ,  H01S3/30 ,  H04B10/08 ,  H04B10/16 ,  H04J14/08

CPC classification number: H01S5/141 ,  G02B5/281 ,  G02B5/284 ,  G02B6/29358 ,  G02B6/29395 ,  G02B6/29398 ,  G02B6/4204 ,  G02B26/002 ,  G02B26/007 ,  H01S3/1062 ,  H01S5/02248 ,  H01S5/02284 ,  H01S5/0687 ,  H04J14/02

Abstract: Wavelength-agile optical filters, suitable for wavelength-division-multiplexed optical communications networks, which provide for electrical or mechanical tuning to a known position or electrical parameter with precision in the selected center wavelength arising as result of the arrangements of a grid generator (246) and a channel selector (252). Within the embodiments of the invention, it may be used in a wide range of applications, such as, tuning an external cavity laser, selecting a wavelength for an add/drop multiplexer and providing channel selection and feedback for a wavelength locker, or be implemented in whole or in part of a gain medium (224). The invention may thus be utilized in telecom applications to generate the center wavelengths for any channel on the current International Telecommunications Union or other optical grids.

Abstract translation: 波长敏捷的光学滤波器，适用于波分复用光通信网络，其提供电或机械调谐到已知位置或电参数，精确地选择的中心波长由于电网发生器（246）的布置而产生 ）和频道选择器（252）。 在本发明的实施例中，其可以用于广泛的应用中，例如调谐外腔激光器，选择加/减多路复用器的波长并为波长锁定器提供通道选择和反馈，或实现 全部或部分增益介质（224）。 因此，本发明可以用于电信应用中以产生当前国际电信联盟或其他光栅上的任何信道的中心波长。

公开(公告)号：WO01001396A1

公开(公告)日：2001-01-04

申请号：PCT/JP1999/003481

申请日：1999-06-29

IPC: G11B5/00 ,  G11B5/31 ,  G11B5/39

CPC classification number: B82Y25/00 ,  B82Y10/00 ,  G11B5/00 ,  G11B5/3113 ,  G11B5/3903 ,  G11B5/3932 ,  G11B2005/3996

Abstract: A magnetoresistive head reproduces high-density information from a storage medium while suppressing Barkhausen noise. The head comprises a magnetoresistive element consisting of a multilayered film that includes a free magnetic layer where the orientation of magnetization changes depending on the external magnetic field; an insulating layer; a nonmagnetic underlayer formed on the insulating layer; and a pair of wall control layers spaced at a predetermined interval on the underlayer to control the movement of the domain wall of the free magnetic layer. Both ends of the free magnetic layer are attached directly to the pair of domain wall control layers, and the center of the free magnetic layers are attached directly to the underlayer.

Abstract translation: 磁阻头在抑制巴克豪森噪声的同时从存储介质再现高密度信息。 头部包括由多层膜组成的磁阻元件，该多层膜包括磁化方向取决于外部磁场的自由磁性层; 绝缘层; 形成在所述绝缘层上的非磁性底层; 以及在底层上以预定间隔隔开的一对壁控制层，以控制自由磁性层的畴壁的移动。 自由磁性层的两端直接附着在一对畴壁控制层上，自由磁性层的中心直接附着在底层上。

公开(公告)号：WO00067260A1

公开(公告)日：2000-11-09

申请号：PCT/EP2000/003537

申请日：2000-04-17

IPC: G11B5/00 ,  G11B5/012 ,  G11B5/035 ,  G11B5/09 ,  G11B19/02 ,  G11B20/10 ,  G11B33/12 ,  H03F3/45 ,  H03H11/04 ,  H03H11/12

CPC classification number: H03F3/4508 ,  G11B5/012 ,  G11B5/035 ,  G11B5/09 ,  G11B19/02 ,  G11B20/10009 ,  G11B33/122 ,  G11B2005/0013 ,  G11B2005/0016 ,  H03F2203/45458 ,  H03F2203/45612 ,  H03F2203/45648

Abstract: A feedback system includes an emitter-follower as a gain stage in the forward path. The emitter-follower has a very wide band width and does not, by itself, effectively narrow the bandwidth of an information channel in which it is used. According to the invention, the feedback system includes a differentiator with a programmable zero in the feedback path. The zero in the feedback path creates a pole in the forward path and the programmed location of the zero influences the pole and controls the bandwidth of the forward path. Using a switch in the feedback path enables the differentiator to be turned off or switched out of the loop so that the forward path is not effected when bandwidth reduction is not required. With appropriate switching, the same differentiator is used to create a zero in the forward path as well as pole in the forward path.

Abstract translation: 反馈系统包括发射极跟随器作为前进路径中的增益级。 发射极跟随器具有非常宽的带宽，并且本身不能有效地缩小其使用信息信道的带宽。 根据本发明，反馈系统包括在反馈路径中具有可编程零的微分器。 反馈路径中的零点在正向通路中产生极点，零点的编程位置影响极点并控制正向通道的带宽。 使用反馈路径中的开关可以使微分器被关闭或切换出环路，以便在不需要带宽降低时不会影响正向通路。 通过适当的切换，使用相同的微分器在正向路径中产生零点以及在前进路径中产生极点。

公开(公告)号：WO00063906A1

公开(公告)日：2000-10-26

申请号：PCT/US2000/010584

申请日：2000-04-20

IPC: G11B5/09 ,  G11B5/00 ,  G11B5/02 ,  G11B20/10

CPC classification number: G11B20/10055 ,  G11B5/02 ,  G11B5/09 ,  G11B20/10009 ,  G11B20/10203 ,  G11B20/10296 ,  G11B2005/0016 ,  G11B2005/0018

Abstract: A method for compensating digital samples of an asymmetric read signal is presented. The method involves reading a digital sample of an asymmetric read signal V(t)(160), generating a compensated sample at least when the digital sample requires compensation (164), and outputting either the digital sample (168) or the compensated sample (166). Also presented is an asymmetry correction block (158) of a read channel (144) of a disc drive (110) that includes an input (200), a level detector (202), a compensator (204), and an output (208). The level detector (202) and the compensator (204) receive the digital sample through the input (200). The level detector (202) determines whether the digital sample requires compensation. The compensator (204) generates a compensated sample at least when the digital sample requires compensation. The output (208) selectively outputs either the digital sample or the compensated sample.

Abstract translation: 提出了一种用于补偿非对称读信号的数字样本的方法。 该方法涉及读取非对称读取信号V（t）（160）的数字样本，至少当数字样本需要补偿时产生补偿样本（164），并输出数字样本（168）或补偿样本 166）。 还提出了包括输入（200），电平检测器（202），补偿器（204）和输出（208）的盘驱动器（110）的读通道（144）的不对称校正块（158） ）。 电平检测器（202）和补偿器（204）通过输入（200）接收数字采样。 电平检测器（202）确定数字样本是否需要补偿。 至少当数字样本需要补偿时，补偿器（204）产生补偿样本。 输出（208）选择性地输出数字样本或补偿样本。

公开(公告)号：WO00060583A1

公开(公告)日：2000-10-12

申请号：PCT/JP1999/001679

申请日：1999-03-31

IPC: G11B5/00 ,  G11B5/012 ,  G11B5/09 ,  G11B5/73 ,  G11B5/66

CPC classification number: G11B5/7325 ,  G11B5/00 ,  G11B5/012 ,  G11B5/09 ,  G11B2005/0002

Abstract: A magnetic recording medium including an alignment control film of an L10 crystal structure, L21 crystal structure, f.c.c. crystal structure, or B2 (CsCl) crystal structure containing B formed on a substrate and a Co alloy magnetic film formed directly on the alignment control film or through an underlying film of Cr or a Cr alloy on the alignment control film, exhibiting a high coercive force, producing little noise, and not being influenced by thermal fluctuation. A magnetic storage device comprising a combination of such a magnetic recording medium, a driver for driving the magnetic recording medium in a recording direction, a magnetic head having a recording part and a reproducing part opposed to respective sides of the magnetic recording medium, means for moving the magnetic head relative to the magnetic recording medium, and a recording/reproduced signal processing means for processing the waveforms of the input/output signals to/from the magnetic head. By thus combining the magnetic recording medium and the magnetic head having an element exclusively used for reproduction making the use of magnetoresistance effect, a magnetic storage device having a recording density of more than 3 gigabits per square inches is provided.

Abstract translation: 一种磁记录介质，包括L10晶体结构的取向控制膜，L21晶体结构，f.c. 晶体结构或在基板上形成的含有B的B2（CsCl）晶体结构和直接形成在取向控制膜上的Co合金磁性膜，或者通过取向控制膜上的Cr或Cr合金的下面的膜，显示出高矫顽力 力量，噪音小，不受热波动的影响。 一种磁存储装置，包括这种磁记录介质的组合，用于在记录方向上驱动磁记录介质的驱动器，具有记录部分的磁头和与磁记录介质的各侧相对的再现部分的装置 相对于磁记录介质移动磁头;以及记录/再现信号处理装置，用于处理来自磁头的输入/输出信号的波形。 通过这样组合磁记录介质和具有专门用于再现的元件的磁头来实现磁阻效应，提供了具有大于3千兆比特每平方英寸的记录密度的磁存储装置。

公开(公告)号：WO00058951A1

公开(公告)日：2000-10-05

申请号：PCT/JP2000/001978

申请日：2000-03-29

IPC: G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09 ,  G11B11/105 ,  H03K17/687

CPC classification number: G11B5/09 ,  G11B5/012 ,  G11B5/02 ,  G11B11/10508 ,  G11B2005/0013 ,  H03K17/6872

Abstract: A magnetic head drive circuit (15) comprises a control circuit (20) for receiving a recording signal for recording a signal on a recording medium by use of magnetism and generating a control signal according to the recording signal and a switch circuit (30) including switching FETs (31 to 34) for changing the direction of current made to flow through a field coil (16) of a magnetic head (14) according to the control signal. The switching FETs are Pch FETs (31, 32) and Nch FETs (33, 34). The maximum of the gate voltage of the switching FETs is lower than the voltage (Vd) of a coil power supply for supplying the current flowing through the field coil (16) and higher than the gate threshold voltage of the switching FETs.

Abstract translation: 磁头驱动电路（15）包括控制电路（20），用于通过使用磁场接收用于在记录介质上记录信号的记录信号，并根据记录信号产生控制信号;以及开关电路（30），包括 用于根据控制信号改变流过磁头（14）的励磁线圈（16）的电流的方向的开关FET（31至34）。 开关FET是Pch FET（31,32）和Nch FET（33,34）。 开关FET的栅极电压的最大值低于用于供给流过励磁线圈（16）的电流的线圈电源的电压（Vd），并且高于开关FET的栅极阈值电压。

公开(公告)号：WO00057404A1

公开(公告)日：2000-09-28

申请号：PCT/JP1999/001395

申请日：1999-03-19

IPC: G11B5/00 ,  G11B5/012 ,  G11B33/12 ,  G11B5/02

CPC classification number: G11B5/012 ,  G11B33/122 ,  G11B2005/0013

Abstract: A magnetic disk memory mounted thereon with a semiconductor integrated circuit device operated under a second voltage for applying a ground potential of a circuit to a disc-shaped magnetic storage medium and being kept at a positive potential at the free end of an arm to which an MR head is attached and centering around a first potential of the above circuit and under a third voltage kept at a negative potential, wherein the semiconductor integrated circuit device has built-in therein a bias circuit for biasing the above MR head to the vicinity of a voltage centering around the first voltage, and a lead amplifier which feedbacks a current slightly smaller than emitter currents of first and second amplifier transistors and kept in an opposite phase by using a current feedback circuit for supplying a read signal by the above MR head to the bases of the above first and second amplifier transistors and providing a capacitor between the emitters of the first and second amplifier transistors to receive their collector output signals, which reduces signal current components flowing into the above capacitor, and which receives output signals from the first and second amplifier transistors.

Abstract translation: 一种磁盘存储器，其安装有半导体集成电路器件，该半导体集成电路器件在第二电压下工作，用于将电路的接地电位施加到盘形磁存储介质上，并在臂的自由端处保持在正电位， MR头被附接并围绕上述电路的第一电位并保持在负电位的第三电压下，其中半导体集成电路器件内置有用于将上述MR头偏置到 电压以第一电压为中心，以及引线放大器，反馈电流稍微小于第一和第二放大器晶体管的发射极电流，并通过使用电流反馈电路保持在相反的相位，用于将上述MR磁头的读取信号提供给 上述第一和第二放大器晶体管的基极，并且在第一和第二放大器晶体管的发射极之间提供电容器 以接收它们的集电极输出信号，其减少流入上述电容器的信号电流分量，并且其接收来自第一和第二放大器晶体管的输出信号。

公开(公告)号：WO00031734A1

公开(公告)日：2000-06-02

申请号：PCT/EP1999/009139

申请日：1999-11-22

IPC: G11B5/00 ,  G11B11/105 ,  G11B13/04

CPC classification number: G11B5/00 ,  G11B11/10536 ,  G11B11/10545 ,  G11B11/10554 ,  G11B11/10584 ,  G11B13/045 ,  G11B2005/0002

Abstract: A magnetic disk has a layered configuration comprising a recordable layer (110) and a reflective layer (112). Laser-stimulated recording takes place by a magnetic head (102) that obstructs the laser beam for a minor portion. The converging laser beam traverses the recording layer and gets reflected at the reflective layer, whereupon it reaches its focus in the recordable layer. The head gets only a fraction of the radiation. This enables to keep the head's temperature well within control.

Abstract translation: 磁盘具有包括可记录层（110）和反射层（112）的分层结构。 激光刺激的记录是通过将激光束阻挡在较小部分的磁头（102）进行的。 会聚激光束穿过记录层并在反射层被反射，于是它到达可记录层中的焦点。 头部只得到辐射的一小部分。 这样可以保持头部温度的良好控制。

公开(公告)号：WO00030102A1

公开(公告)日：2000-05-25

申请号：PCT/EP1999/008626

申请日：1999-11-08

IPC: G11B5/09 ,  G01R33/09 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B7/00 ,  G11B20/10 ,  G11B20/18 ,  G11B20/22 ,  G11B20/24 ,  G11B33/14

CPC classification number: G11B7/00 ,  G01R33/09 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09 ,  G11B20/10009 ,  G11B20/18 ,  G11B20/22 ,  G11B33/14 ,  G11B2005/0016 ,  G11B2005/0018

Abstract: An arrangement is disclosed for reading information from a record carrier, such as in a HDD. The arrangement comprises a read head (Rmr1), an amplifier (74) for amplifying the signal read by the read head, an equalizer (76) for equalizing the signal read by the read head, and a bit detector (80) for detecting bits in the signal read by the read head. In accordance with the invention, the arrangement further comprises a DC correction unit (78) for subtracting a correction value from an input signal in response to an error signal so as to obtain a DC corrected output signal. The bit detector (80) is adapted to detect a sequence of bits based in the DC corrected output signal. Further, an error signal generating unit (82, 83, 85) is present for generating the error signal in response to the DC corrected output signal and the sequence of bits.

Abstract translation: 公开了一种用于从诸如HDD中的记录载体读取信息的装置。 该装置包括读头（Rmr1），用于放大由读头读取的信号的放大器（74），用于均衡读头读取的信号的均衡器（76）和用于检测位的位检测器（80） 在由读头读取的信号中。 根据本发明，该装置还包括DC校正单元（78），用于响应于误差信号从输入信号中减去校正值，以获得DC校正的输出信号。 位检测器（80）适于基于DC校正的输出信号来检测位序列。 此外，存在用于响应于DC校正的输出信号和位序列而产生误差信号的误差信号生成单元（82,83,85）。

公开(公告)号：WO00011663A1

公开(公告)日：2000-03-02

申请号：PCT/US1998/026839

申请日：1998-12-17

IPC: G11B5/00 ,  G11B5/55 ,  G11B5/596 ,  G11B15/12 ,  G11B19/04 ,  G11B5/39

CPC classification number: G11B5/59683 ,  G11B5/553 ,  G11B5/596 ,  G11B15/125 ,  G11B19/04 ,  G11B2005/0016

Abstract: An apparatus and method for extending the service life of an MR element (157) incorporated in a read/write head (156) involves detecting periods of disk drive system inactivity and selectively switching between the heads (156) for purposes of reading servo information during the inactive periods. Selecting between heads (156) may involve selecting (260) a head (156) having a minimum of usage, such as a head (156) having an MR element (157) with a minimum of cumulative operational time or energy dissipation relative to other MR elements (157) provided in the disk drive system (20). Reducing the servo sampling rate (320) during a period of system (20) inactivity. The MR elements (307) may be selectively activated during idle periods so as to further reduce usage of the MR elements (307).

Abstract translation: 用于延长结合在读/写头（156）中的MR元件（157）的使用寿命的装置和方法涉及检测磁盘驱动系统不活动的周期，并且在磁头（156）之间选择性地切换以便在伺服信息期间读取伺服信息 非活动期。 在头部（156）之间的选择可以包括选择（260）具有最小使用量的头部（156），例如具有MR元件（157）的头部（156），其具有相对于其他的最小累积操作时间或能量耗散 设置在磁盘驱动系统（20）中的MR元件（157）。 在系统（20）不活动期间减少伺服采样率（320）。 可以在空闲周期期间选择性地激活MR元件（307），以便进一步减少MR元件（307）的使用。