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    Optical data storage and retrieval system and method
    1.
    发明公开
    Optical data storage and retrieval system and method 失效
    系统与Verfahren zur optischen Speicherung und Wiedergewinnung von Daten

    公开(公告)号：EP0814471A2

    公开(公告)日：1997-12-29

    申请号：EP97116979

    申请日：1992-05-11

    申请人： DISCOVISION ASS

    发明人： KIMURA, NOBORU ,  VITULLO, RONALD G. ,  YAMAZAKI, YASUHIRO

    IPC分类号： G11B7/0045 ,  G11B7/005 ,  G11B7/125 ,  G11B11/10 ,  G11B11/105 ,  G11B19/00 ,  G11B19/02 ,  G11B19/12 ,  G11B20/10 ,  G11B20/12 ,  G11B20/14 ,  G11B20/18 ,  G11B27/30 ,  G11B7/00

    CPC分类号： G11B7/126 ,  G11B7/0045 ,  G11B7/005 ,  G11B11/10506 ,  G11B11/10515 ,  G11B11/1053 ,  G11B11/10597 ,  G11B19/00 ,  G11B19/02 ,  G11B19/12 ,  G11B20/10009 ,  G11B20/1258 ,  G11B20/1262 ,  G11B20/1426 ,  G11B20/1833 ,  G11B27/3027 ,  G11B2020/1434

    摘要： A first write encoder (18) encodes digital data in a first, high-density format. A second write encoder (16) encodes digital data in a second, low-density (i.e., ANSI) format. A first read decoder (28) decodes digital data from the first format. A second read decoder (26) decodes digital data from the second format. A disk drive (34) receives a replaceable 90 millimeter optical disk. A read/write head (20) reads encoded data from and writes encoded data to a 90 millimeter optical disk received by the drive. In a first mode, the first write encoder is connected between a source of digital data (10) and the read/write head, and the first read decoder is connected between the read/write head and the utilizing apparatus (410). In a second mode, the second write encoder is connected between the source and the read/write head, and the second read decoder is connected between the read/write head and the utilizing apparatus. Control electronics (30) switch between the first and second modes, depending upon the format in which data is recorded on the disk received by the disk drive. An 8/9 GCR encoder (12) and a laser pulse generator (14) are used in the first write encoder to record data on the optical media to increase the storage capacity. Improvement in timing is accomplished with write compensation and signal equalization.

    摘要翻译： 第一写入编码器（18）以第一高密度格式对数字数据进行编码。 第二写入编码器（16）以第二，低密度（即ANSI）格式对数字数据进行编码。 第一读取解码器（28）从第一格式解码数字数据。 第二读取解码器（26）从第二格式解码数字数据。 磁盘驱动器（34）接收可更换的90毫米光盘。 读/写头（20）从编码数据读取编码数据并将其编码到由驱动器接收的90毫米光盘上。 在第一模式中，第一写入编码器连接在数字数据源（10）和读/写头之间，第一读取解码器连接在读/写头与利用装置（410）之间。 在第二模式中，第二写入编码器连接在源和读/写头之间，第二读取解码器连接在读/写头与利用装置之间。 控制电子设备（30）在第一和第二模式之间切换，这取决于磁盘驱动器接收的磁盘上记录数据的格式。 在第一写入编码器中使用8/9 GCR编码器（12）和激光脉冲发生器（14）来在光学介质上记录数据以增加存储容量。 通过写入补偿和信号均衡来实现时序的改进。

    Seek actuator for optical recording
    6.
    发明公开
    Seek actuator for optical recording 失效
    Suchaktuatorfüroptische Aufzeichnung

    公开(公告)号：EP0737963A3

    公开(公告)日：1998-07-08

    申请号：EP96301864

    申请日：1996-03-19

    申请人： DISCOVISION ASS

    发明人： GRASSENS LEONARDUS JOHANNES ,  GETREUER KURT WALTER

    IPC分类号： G11B5/55 ,  G11B7/0037 ,  G11B7/004 ,  G11B7/007 ,  G11B7/085 ,  G11B7/09 ,  G11B7/135 ,  G11B11/105 ,  G11B17/04 ,  G11B20/10 ,  G11B20/12 ,  G11B21/10 ,  H02K41/035

    CPC分类号： G11B7/0037 ,  G11B7/004 ,  G11B7/00745 ,  G11B7/08529 ,  G11B7/08582 ,  G11B7/09 ,  G11B7/0901 ,  G11B7/0908 ,  G11B7/0917 ,  G11B7/093 ,  G11B7/0932 ,  G11B7/0933 ,  G11B7/0935 ,  G11B7/0943 ,  G11B7/0945 ,  G11B7/1356 ,  G11B11/10563 ,  G11B11/10576 ,  G11B11/10595 ,  G11B17/043 ,  G11B17/0438 ,  G11B20/10009 ,  G11B20/1258 ,  G11B21/10 ,  G11B21/106 ,  G11B2007/0919 ,  G11B2020/10916 ,  H02K41/0354 ,  H02K41/0356

    摘要： An assembly for controlling the position of a lens in an optical data storage and retrieval drive includes a carriage that suspends a lens holder using a plurality of flexures. A lens is mounted in the lens holder such that the center of mass of the suspended lens holder lies on the optical axis of the lens, and also coincides with the center of mass of the lens. The lens holder is capable of relative motion with respect to the carriage with at least one degree of freedom. The center of mass of the carriage lies within 0.1 mm of the optical axis, proximate the center of mass of the lens holder. Suspensory forces acting on the lens holder are symmetric about the optical axis. A coarse magnetic drive moves the carriage in a tracking direction, and exerts forces on the carriage that are balanced and symmetric about the optical axis, so that moments about the center of mass of the carriage are effectively absent. Inertial forces acting on the carriage, and forces reactive to the magnetic drive forces are also balanced and symmetric with respect to the optical axis, and produce insubstantial moments about the center of mass of the carriage. There is a fine tracking and a focusing drive for the lens holder. Both of these drives produce balanced and symmetric forces about the optical axis, such that moments about the optical axis are absent. Inertial forces and reactive forces acting on the suspended lens holder are also symmetric about the optical axis. As a result the objective lens moves along its optical axis, and in its tracking direction without change in attitude, and its focal point can be precisely controlled with respect to the surface of a storage medium being read or written.

    摘要翻译： 一种用于控制光学数据存储和取回驱动器中的透镜的位置的组件包括托架，该托架使用多个挠曲来悬挂透镜保持器。 透镜安装在透镜架中，使得透镜架的质心位于透镜的光轴上，并且也与透镜的质心一致。 透镜架能够以至少一个自由度相对于滑架进行相对运动。 滑架的质心位于光轴的0.1毫米范围内，靠近镜头支架的质心。 作用在透镜架上的悬置力是关于光轴对称的。 粗磁驱动器使滑架沿跟踪方向移动，并且在滑架上施加力，使其平衡并且关于光轴对称，从而实际上不存在围绕滑架质心的力矩。 作用在托架上的惯性力以及与磁力驱动力反应的力也是平衡的并且相对于光轴对称，并且围绕托架质量中心产生非实质性的力矩。 镜头架有一个精确的跟踪和聚焦驱动。 这两种驱动器均产生关于光轴的平衡且对称的力，使得围绕光轴的力矩不存在。 作用在悬浮式透镜架上的惯性力和反作用力也关于光轴对称。 结果，物镜沿着其光轴移动，并且在其跟踪方向上移动而不改变姿态，并且其焦点可以相对于被读取或写入的存储介质的表面精确地控制。

    Optical test system including interferometer with micromirror
    7.
    发明公开
    Optical test system including interferometer with micromirror 失效
    Optisches测试系统微电脑干涉仪

    公开(公告)号：EP0814331A2

    公开(公告)日：1997-12-29

    申请号：EP97116978

    申请日：1996-03-19

    申请人： DISCOVISION ASS

    发明人： PRIKRYL IVAN ,  HALL HOLLIS O'NEAL

    IPC分类号： G01B9/02 ,  G01J3/45 ,  G01J3/453 ,  G01J9/02 ,  G01M11/02

    CPC分类号： G01J3/45 ,  G01J3/4535 ,  G01J9/02

    摘要： An interferometer includes a beamsplitter for splitting a source beam into a test beam and a reference beam, an imaging device for detecting an interference pattern, a mirror disposed in a path of the test beam for reflection of the test beam toward the imaging device, a micromirror disposed in a path of the reference beam for reflection of a portion of the reference beam toward the imaging device, and a focusing mechanism disposed for focusing the reference beam on the micromirror. The micromirror has a lateral dimension not exceeding the approximate lateral dimension of a central lobe of the reference beam focused thereon by the focusing mechanism. A spatial filter for reducing effects of aberration in a beam includes a reflector disposed upon a transparent base wherein the reflector has a lateral dimension not exceeding the approximate lateral dimension of a central lobe of the spatial intensity distribution of the beam focused upon the reflector. A method of filtering a beam in a wavefront measurement system is also provided. This method includes focusing the beam, reflecting a particular first portion of the focused beam, and transmitting a second portion of the beam.

    摘要翻译： 干涉仪包括用于将源束分裂成测试光束和参考光束的分束器，用于检测干涉图案的成像装置，设置在测试光束的路径中以用于将测试光束反射到成像装置的反射镜， 设置在参考光束的路径中以将参考光束的一部分反射到成像装置的微镜;以及聚焦机构，设置用于将参考光束聚焦在微镜上。 微镜的横向尺寸不超过由聚焦机构聚焦在其上的参考光束的中心波瓣的近似侧向尺寸。 用于减小光束中的像差影响的空间滤光器包括设置在透明基底上的反射器，其中反射器的横向尺寸不超过聚焦在反射器上的光束的空间强度分布的中心波瓣的大致侧向尺寸。 还提供了一种在波前测量系统中对波束进行滤波的方法。 该方法包括聚焦光束，反射聚焦光束的特定第一部分，以及透射光束的第二部分。

    Signal processing system
    9.
    发明公开
    Signal processing system 失效
    Signalverarbeitungssystem

    公开(公告)号：EP0748118A3

    公开(公告)日：1998-09-16

    申请号：EP96301867

    申请日：1996-03-19

    申请人： DISCOVISION ASS

    发明人： CLAYDON ANTHONY PETER JOHN ,  GAMMACK RICHARD JOHN

    IPC分类号： H03M13/41 ,  H04L1/00 ,  H04L7/02 ,  H04L27/00 ,  H04L27/22 ,  H04L27/227 ,  H04L27/38 ,  H04N7/24 ,  H04N7/12

    CPC分类号： H04L7/0029 ,  H04L1/0054 ,  H04L1/0057 ,  H04L1/0065 ,  H04L1/0068 ,  H04L7/0334 ,  H04L7/0335 ,  H04L27/3872 ,  H04L2027/0028 ,  H04L2027/0057 ,  H04L2027/0067 ,  H04N21/2383 ,  H04N21/4382

    摘要： A CMOS integrated signal processing system for a sampling receiver includes a timing recovery circuit, wherein an on-chip numerically controlled oscillator is operative at periods T that are initially equal to the nominal baud rate of the signals controls a sinc interpolator receiving samples at the sampling rate. A loop filter is coupled to the sinc interpolator and to the numerically controlled oscillator. The arrangement is capable of handling various symbol rates. The system includes a circuit for carrier recovery, having a second on-chip numerically controlled oscillator, a digital derotation circuit responsive to the second numerically controlled oscillator, accepting an in phase component and a quadrature component of the sampled signals. An adaptive phase error estimation circuit is coupled in a feedback loop.

    摘要翻译： 用于采样接收机的CMOS集成信号处理系统包括定时恢复电路，其中片上数字控制振荡器在初始等于信号的标称波特率的周期T处操作，控制正弦内插器在采样时接收采样 率。 环路滤波器耦合到正弦内插器和数控振荡器。 该安排能够处理各种符号率。 该系统包括用于载波恢复的电路，其具有第二片上数字控制振荡器，响应于第二数字控制振荡器的数字消旋电路，接收采样信号的同相分量和正交分量。 自适应相位误差估计电路耦合在反馈回路中。

    Improved optical disc tracking control
    10.
    发明公开
    Improved optical disc tracking control 失效
    的光盘的改进的跟踪控制

    公开(公告)号：EP0747892A3

    公开(公告)日：1998-05-20

    申请号：EP96301868

    申请日：1996-03-19

    申请人： DISCOVISION ASS

    发明人： CESHKOVSKY LUDWIG

    IPC分类号： G11B21/08 ,  G11B7/085 ,  G11B7/09

    CPC分类号： G11B7/08505 ,  G11B7/08517 ,  G11B7/0943

    摘要： The present invention allows the light beam of an optical disc storage device to radially move between different information tracks of an optical disc while the storage device tracking servo loop remains in a continuous closed loop mode of operation. The invention operates to radially move a light beam from one information track to another during a closed loop mode of operation by activating two control signals introduced into the closed tracking servo loop to create a phantom track center that radially moves across the optical disc. Because the tracking servo loop is in a closed loop mode of operation, the tracking servo operates to keep the light beam centered on the point that the tracking servo considers to be the center of an information track; in this case the phantom track center. Therefore, the tracking servo causes the light beam to radially move across the disc in a closed loop mode of operation by keeping the light beam centered on the moving phantom track center.