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公开(公告)号：US5046060A
公开(公告)日：1991-09-03
申请号：US538049
申请日：1990-06-14
CPC分类号： G11B7/085 , G11B7/0946
摘要： In a disk recorder, unintended radial portions of a transducer or head, herein termed "skating", is rapidly controlled and stopped before the transducer or head can hit a crash stop. Even when a braking operation is effected in the wrong direction, the skating compensation reverses the braking operation for rapidly stopping the radial motion of a transducer. A pair of clamp circuits are electrically interposed between the servo actuator drive signal generation and a run-out compensation circuit such that the clamping operation does not alter the run-out compensation. The sequences of machine states for effecting the state accommodation are described.
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2.发明授权Positioning systems including reliable track crossing detection for high speed relative motions 失效定位系统包括用于高速相对运动的可靠轨道交叉检测
公开(公告)号：US5038333A
公开(公告)日：1991-08-06
申请号：US347639
申请日：1989-05-05
申请人： William W. Chow , Alan A. Fennema , Benjamin C. Fiorino , Ian E. Henderson , Ronald J. Kadlec , Spencer D. Roberts
发明人： William W. Chow , Alan A. Fennema , Benjamin C. Fiorino , Ian E. Henderson , Ronald J. Kadlec , Spencer D. Roberts
IPC分类号： G05D3/12 , G11B7/085 , G11B11/105 , G11B21/08
CPC分类号： G11B7/08541 , G11B11/10556 , G11B21/088 , G11B7/08529
摘要： A track-seeking apparatus of a disk recorder employs a track-crossing sensor to produce track-crossing signals. An oscillator is slaved to the sensor for supplying substitute track-crossing pulses in the absence of the sensor providing such pulses or when the radial velocity exceeds a threshold velocity. A velocity profile means alters the oscillator frequency so that the oscillator produces track-crossing pulses in accordance with the profile.
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3.发明授权Positioning systems employing velocity and position control loops with position control loop having an extended range 失效使用具有位置控制环的速度和位置控制环的定位系统具有扩展范围
公开(公告)号：US5090002A
公开(公告)日：1992-02-18
申请号：US320197
申请日：1989-03-07
IPC分类号： G11B21/10 , G05B19/23 , G05B19/39 , G05D3/12 , G11B7/085 , G11B7/09 , G11B11/105 , G11B21/08
CPC分类号： G11B11/10556 , G05B19/232 , G05B19/39 , G11B11/10571 , G11B21/085 , G11B7/08582 , G11B7/0901 , G05B2219/41457 , G05B2219/42104
摘要： A position servo system has a position loop and a velocity loop. The position loop controls the stop-lock condition and provides for movement control within a range about the stop-lock position. The velocity circuit is employed for movements outside of the range of the position servo circuit. When the velocity servo's loop is being used, a compare circuit compares the servo drive signal from the velocity circuit with a signal generated by the position servo loop which is tracking the velocity servo loop. When the compare circuit finds that the servo drive signals have equal amplitudes, then the velocity servo loop is disconnected from an actuator with the position servo loop then connected to the activation for completing the movement to a desired or target stop-lock position. The above-indicated servo system controls a topping or fine actuator carried on a carriage moved by a coarse actuator. The fine and coarse actuators move along the same axis and transverse to movement of any work element, such as a record storage disk. The coarse actuator is continuously slaved to the positioning of the topping or fine actuator. A relative position sensor disposed intermediate the fine and coarse actuators supplies a position error signal for enabling the coarse actuator to continuously follow the fine actuator. Feed forward signals are supplied from the fine actuator to the coarse actuator. A preferred embodiment is shown using an optical disk environment.
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4.发明授权Digital servo control system for use in disk drives, including sample integrity tester for reducing effects of spurious sampled position values 失效用于磁盘驱动器的数字伺服控制系统，包括用于减少杂散采样位置值影响的样品完整性测试仪
公开(公告)号：US5602689A
公开(公告)日：1997-02-11
申请号：US456858
申请日：1995-06-01
CPC分类号： G11B5/59622 , G11B21/081 , G11B21/085 , G11B21/10 , G11B5/5534 , G11B5/5547 , G11B5/59616 , G11B5/5965
摘要： A servo control system provides adaptive compensation for a variety of tracking and seek problems found in disk drives. The servo control system is ideally implemented in digital form for accuracy, speed and compactness. A first embodiment includes two modes, a tracking (or position) mode and a seek (or velocity) mode, each mode employing a variety of compensation functions. A second embodiment includes a single comprehensive control system which functions during both tracking and seek operations.
摘要翻译： 伺服控制系统为各种跟踪和寻找磁盘驱动器中存在的问题提供自适应补偿。 伺服控制系统理想地以数字形式实现精度，速度和紧凑性。 第一实施例包括两种模式，跟踪（或位置）模式和寻道（或速度）模式，每种模式采用各种补偿功能。 第二实施例包括在跟踪和寻找操作期间起作用的单个综合控制系统。
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公开(公告)号：US5638230A
公开(公告)日：1997-06-10
申请号：US456853
申请日：1995-06-01
申请人： Ronald J. Kadlec
发明人： Ronald J. Kadlec
CPC分类号： G11B5/59622 , G11B21/081 , G11B21/085 , G11B21/10 , G11B5/5534 , G11B5/5547 , G11B5/59616 , G11B5/5965
摘要： A servo control system provides adaptive compensation for a variety of tracking and seek problems found in disk drive. The servo control system is ideally implemented in digital form for accuracy, speed and compactness. A first embodiment includes two modes, a tracking (or position) mode and a seek (or velocity) mode, each mode employing a variety of compensation functions. A second embodiment includes a single comprehensive control system which functions during both tracking and seek operations.
摘要翻译： 伺服控制系统为各种跟踪和寻找磁盘驱动器中发现的问题提供自适应补偿。 伺服控制系统理想地以数字形式实现精度，速度和紧凑性。 第一实施例包括两种模式，跟踪（或位置）模式和寻道（或速度）模式，每种模式采用各种补偿功能。 第二实施例包括在跟踪和寻找操作期间起作用的单个综合控制系统。
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6.发明授权Transducer positioning servo mechanisms employing digital and analog circuits 失效采用数字和模拟电路的传感器定位伺服机构
公开(公告)号：US4914725A
公开(公告)日：1990-04-03
申请号：US377399
申请日：1989-07-10
CPC分类号： G05B19/232 , G11B21/085 , G11B7/08517 , G11B7/08529 , G11B7/08541 , G11B7/0941 , G05B2219/37313 , G05B2219/42209
摘要： A track-seeking system for an optical disk using a velocity control loop with partially-digitized velocity measurement. A quadrature signal is generated based on summing the halves of a position error signal to give directionality to track-crossing counts. A so-called piggy-back construction, wherein a fine positioner is carried by a coarse positioner, is employed. Feed-forward controls are provided from the fine to the coarse positioner. At track-capture time, the dynamic range of the fine positioner is momentarily increased.
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