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1. 发明授权

US5038333A Positioning systems including reliable track crossing detection for high speed relative motions 失效
标题翻译：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.

2. 发明授权

US4914725A Transducer positioning servo mechanisms employing digital and analog circuits 失效
标题翻译：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
申请人： Karl A. Belser , Paul J. Dounn , Ian E. Henderson , Ronald J. Kadlec , Spencer D. Roberts
发明人： Karl A. Belser , Paul J. Dounn , Ian E. Henderson , Ronald J. Kadlec , Spencer D. Roberts
IPC分类号： G05B19/23 , G11B7/085 , G11B7/09 , G11B21/08
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.

3. 发明授权

US5128913A Acquiring focus in an optical system using a soft focus acquiring system 失效
标题翻译：在使用软焦点采集系统的光学系统中获取焦点
公开(公告)号：US5128913A
公开(公告)日：1992-07-07
申请号：US533305
申请日：1990-06-04
申请人： Alan A. Fennema , Spencer D. Roberts
发明人： Alan A. Fennema , Spencer D. Roberts
IPC分类号： G02B7/28 , G02B7/18 , G11B7/085 , G11B7/09
CPC分类号： G11B7/08511 , G11B7/0908
摘要： The focus acquisition system on optical disk recorder as well as other optical systems, uses repeated pulse position pulses with interlead coasting of an objective lens for providing a soft focus acquire. The pulse energization of the lens to move toward an in-focus condition overcomes stiction and friction. While the coasting allows the energy level applied to the lens movement to be minimal, i.e. soft, the purpose of the interdirectional pulse control actuation is to overcome friction without requiring large power to the lens which can cause an overshoot of the lens at the in-focus position. Compensation techniques and stopping the lens at the in-focus position are also shown.

4. 发明授权

US4125881A Tape motion control for reel-to-reel drive 失效
标题翻译：卷轴到卷轴驱动的胶带运动控制
公开(公告)号：US4125881A
公开(公告)日：1978-11-14
申请号：US798539
申请日：1977-05-19
申请人： John J. Eige , Arvind M. Patel , Spencer D. Roberts , David Stedman
发明人： John J. Eige , Arvind M. Patel , Spencer D. Roberts , David Stedman
IPC分类号： G11B15/43 , B65H23/18 , G11B15/46 , G11B15/48 , G11B15/54 , G11B27/13 , G11B5/09 , G03B1/04
CPC分类号： G11B15/48 , G11B15/54 , G11B27/13 , G11B2220/90
摘要： High tape acceleration rates are achieved in an unbuffered, capstanless tape drive system by a tape motion control apparatus employing separate drive motors for each reel of a reel-to-reel tape transport. Tape moves from one reel past a read/write head and a tape tension sensor to the other reel, there being no tachometer in the tape feed path. A tachometer on one reel shaft provides a large number of pulses per revolution which pulses are counted by a counter; and a tachometer on the other reel shaft provides only one pulse per revolution, which pulse gates out the count then accumulated in the counter for actuating means to provide motor acceleration currents of a magnitude corresponding to said accumulated count according to a predetermined servo algorithm for controlling rotation of both reels. A tape radius constant corresponding to the actual length and thickness of tape in the system is calculated during initial wrap of tape onto the takeup reel. Tension is tightly controlled by an analog tension sensor and servo system.
摘要翻译：通过带式运动控制装置在无缓冲的无卷轴磁带驱动系统中实现高的磁带加速速率，该磁带运动控制装置对于卷轴到卷轴磁带传输的每个卷轴使用单独的驱动马达。磁带从一个卷轴移动通过读/写头和磁带张力传感器到另一卷轴，磁带馈送路径中没有转速表。一个卷轴上的转速表每转提供大量脉冲，这些脉冲由计数器计数; 而另一个卷轴上的转速表仅提供每转一个脉冲，该脉冲将计数累加在计数器中，用于致动装置，以根据预定的伺服算法提供对应于所述累加计数的电动机加速电流，以控制两个卷轴的旋转。在将带子初始卷绕到收紧卷轴上时，计算对应于系统中的带的实际长度和厚度的带半径常数。张力由模拟张力传感器和伺服系统严格控制。

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