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1. 发明授权

US06912235B2 Apparatus and method for phase control of tunable external cavity lasers 有权
标题翻译：可调外腔激光器的相位控制装置和方法
公开(公告)号：US06912235B2
公开(公告)日：2005-06-28
申请号：US10210039
申请日：2002-07-31
申请人： Douglas W. Anthon , Jill D. Berger , Alexander A. Tselikov , Stephen J. Hrinya , Howard S. Lee , Alan A. Fennema , Man F. Cheung
发明人： Douglas W. Anthon , Jill D. Berger , Alexander A. Tselikov , Stephen J. Hrinya , Howard S. Lee , Alan A. Fennema , Man F. Cheung
IPC分类号： H01S5/042 , H01S5/0687 , H01S5/14 , H01S3/098 , H01S3/13
CPC分类号： H01S5/141 , H01S5/042 , H01S5/0687 , H01S5/143
摘要： An apparatus and method for controlling the phase of a tunable laser is provided. Stabilization of the mode of a laser beam is provided as the laser is tuned to a target frequency. For one embodiment, a laser generates a reference beam and an output beam. The power of each of beam is measured by optical detectors, and a ratio thereof is utilized to detect when a mode hop occurs as the laser is coarsely tuned. The average of the pre and post mode hop ratios is utilized as a control setpoint while finely tuning the laser to the target frequency. Wavelength lockers, optical power dividers and optical detectors are utilized to determine power levels of the reference and output beams while also monitoring frequency characteristics thereof. A control unit utilizes the outputs from the wavelength locker to control the operation of the extended cavity laser during and after tuning.
摘要翻译：提供了一种用于控制可调激光器的相位的装置和方法。当激光被调谐到目标频率时，提供激光束的模式的稳定性。对于一个实施例，激光器产生参考光束和输出光束。每个光束的功率由光学检测器测量，并且其比例用于检测当激光器被粗调谐时何时出现模式跳跃。将前和后模式跳比的平均值用作控制设定值，同时将激光器精细地调谐到目标频率。利用波长锁定器，光功率分配器和光学检测器来确定参考和输出光束的功率电平，同时还监视其频率特性。控制单元利用来自波长锁定器的输出来调节调谐期间和之后的扩展腔激光器的操作。

2. 发明授权

US06476998B2 Enhanced settling control in hard disk drive 有权
标题翻译：增强硬盘驱动器的稳定控制
公开(公告)号：US06476998B2
公开(公告)日：2002-11-05
申请号：US09192876
申请日：1998-11-16
申请人： Man F. Cheung
发明人： Man F. Cheung
IPC分类号： G11B5596
CPC分类号： G11B5/5547
摘要： A method for improving servo seek settling performance by selectively activating a gain enhancement control signal during settling. As an actuator approaches a target location, absolute position and velocity of the read/write transducer head are monitored. If the absolute position changes absolute values (positive to negative or vice-versa) or the velocity approaches zero, the gain enhancement control signal is activated and combined with a nominal actuator control signal to further urge the actuator towards the target location. The gain enhancement control signal decays exponentially so as not to excite mechanical resonance of the actuator arms.
摘要翻译：一种通过在沉降期间选择性地激活增益控制信号来提高伺服寻道稳定性能的方法。当致动器接近目标位置时，监视读/写换能器头的绝对位置和速度。如果绝对位置改变了绝对值（正负值或反之亦然）或速度接近零，则增益增强控制信号被激活并与标称致动器控制信号组合，以进一步将致动器推向目标位置。增益控制信号以指数方式衰减，以免激发致动器臂的机械共振。

3. 发明授权

US5574602A Processing servo signals concurrently read from plural spaced-apart servo areas for a magnetic tape having serpentine data track scanning 失效
标题翻译：对于具有蛇形数据轨道扫描的磁带，从多个间隔开的伺服区域同时读取伺服信号
公开(公告)号：US5574602A
公开(公告)日：1996-11-12
申请号：US75624
申请日：1993-06-14
申请人： Robert C. Baca , Man F. Cheung , Alex Chliwnyjae , Wayne T. Comeaux , James F. Crossland
发明人： Robert C. Baca , Man F. Cheung , Alex Chliwnyjae , Wayne T. Comeaux , James F. Crossland
IPC分类号： G11B5/55 , G11B5/584 , G11B15/02 , G11B15/04
CPC分类号： G11B5/584 , G11B15/026 , G11B15/04 , G11B5/5508
摘要： In a magnetic tape drive, a magnetic head simultaneously senses plural track lateral position indicators to generate a like plurality of independently generated sensed position error signals. The sensed position error signals are combined to provide an output position error signal that drives a positioning system to position the magnetic laterally of the length of the magnetic tape. The output position error signal represents an average of the position errors indicated by the sensed position error signals. The quality of the sensed position error signal is monitored, enabling eliminating poor quality signals from the output position error signal for maintaining a quality servo control. If less than a predetermined number of sensed position error signals have acceptable quality, then recording data is prohibited. Independently of sensing servo indicia on a record member to generate the sensed position error signals, a lateral position of the multi-track head is sensed. Upon loading the record member to a load point, the plural track position indicators are simultaneously sensed for centering the head to a predetermined track position. Then, an independent head position sensor is calibrated to the load point track position indicators for use as a verification of validity of the output position error signal. During recording and reading operations, the independent head position is determined on a periodic basis. If an unacceptable change in head position during any measurement period occurs or if the independent measurement indicates an unacceptable lateral deviation from the reference position, all recording is prohibited.
摘要翻译：在磁带驱动器中，磁头同时感测多个轨道横向位置指示器以产生相似多个独立产生的感测位置误差信号。感测到的位置误差信号被组合以提供输出位置误差信号，其驱动定位系统以将磁体的横向方向定位在磁带的长度上。输出位置误差信号表示由感测到的位置误差信号指示的位置误差的平均值。监测感测到的位置误差信号的质量，从而能够消除来自输出位置误差信号的质量差的信号，以保持质量伺服控制。如果小于预定数量的感测位置误差信号具有可接受的质量，则禁止记录数据。独立于在记录构件上感测伺服标记以产生感测到的位置误差信号，感测多轨头的横向位置。在将记录构件加载到加载点时，同时感测多个轨道位置指示器以将磁头定中心到预定轨道位置。然后，将独立的头部位置传感器校准到负载点轨道位置指示器，以用作验证输出位置误差信号的有效性。在记录和读取操作期间，定期地确定独立的头位置。如果在任何测量期间发生头部位置的不可接受的变化，或者如果独立测量表明与参考位置的不可接受的横向偏差，则禁止所有记录。

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