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1.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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2.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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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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4.发明授权Reducing amplitude variations of optical disk readback signals and increasing reliability of track-crossing counts 失效降低光盘读取信号的幅度变化，提高轨道交叉点的可靠性
公开(公告)号：US5138594A
公开(公告)日：1992-08-11
申请号：US512308
申请日：1990-04-20
CPC分类号： G11B7/0948 , G11B19/04 , G11B7/08541
摘要： An optical disk recorder includes disk reflectance calibration means for measuring variations in disk reflectance over the recording area of the disk. Correction factors based on measured reflectance for adjusting sensed signal level and gain reduce the effects of varying reflectance on the sensed signal. In a preferred embodiment, the sensed signal is employed as a signal in quadrature to a tracking error signal for ensuring reliable track counting in a track seeking operation. In a grooved medium, reflectance is calibrated for both grooves and mesas between the grooves.
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5.发明授权Acquiring focus in optical systems using a focus error signal and a laser drive signal 失效使用聚焦误差信号和激光驱动信号获得光学系统中的焦点
公开(公告)号：US4998233A
公开(公告)日：1991-03-05
申请号：US155390
申请日：1988-02-12
CPC分类号： G11B7/08511 , G11B7/0908
摘要： A focus acquire circuit for use in optical systems, such as optical data recorders and players, uses up to three parameters signals to indicate an in-focus condition. The zero crossing of a focus error signal is combined with a signal indicating that the focus error signal has approached a peak value and with a signal indicating a change in laser drive signal amplitude to indicate an in-focus condition. Various circuit details are illustrated showing how the three parameters cna be combined together for indicating an in-focus condition.
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6.发明授权
公开(公告)号：US5128913A
公开(公告)日：1992-07-07
申请号：US533305
申请日：1990-06-04
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.
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7.发明授权Method and apparatus for disc drive data security using fields in servo wedges 有权用于磁盘驱动器数据安全的方法和装置，使用伺服楔中的磁场公开(公告)号：US07518816B2
公开(公告)日：2009-04-14
申请号：US10870866
申请日：2004-06-16
申请人： Alan A. Fennema , Gayle L. Noble
发明人： Alan A. Fennema , Gayle L. Noble
CPC分类号： G11B20/00086 , G11B7/0045 , G11B7/00745 , G11B19/122 , G11B20/00123 , G11B20/0021 , G11B20/00253 , G11B20/00297 , G11B20/00449 , G11B20/00492 , G11B20/00659 , G11B2220/2516
摘要： The present invention includes a method and apparatus to write and read copy protected data on a disc drive storage system by encoding and decoding data to be copy protected using servo wedge data as the encoding element. In one aspect, the drive is marked by a number generated from the servo wedge data.
摘要翻译： 本发明包括一种通过使用伺服楔形数据作为编码元件对要进行复制保护的数据进行编码和解码来将读取保护的数据写入和读取在盘驱动器存储系统上的方法和装置。 在一个方面，驱动器由从伺服楔形数据产生的数字标记。
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8.发明授权Controlling head seeking speed in disk storage units by limiting displacement of head with respect to its supporting headarm 失效通过限制头相对于其支撑头臂的位移来控制磁盘存储单元中的磁头寻道速度
公开(公告)号：US5060210A
公开(公告)日：1991-10-22
申请号：US589706
申请日：1990-09-28
申请人： Alan A. Fennema , Reed A. Hancock
发明人： Alan A. Fennema , Reed A. Hancock
IPC分类号： G11B5/55 , G11B7/085 , G11B11/105 , G11B21/08
CPC分类号： G11B21/085 , G11B11/10556 , G11B5/5556 , G11B7/08517 , G11B7/08588
摘要： In a "piggy-back" head support system, a fine actuator which carries the head (lens or transducer) is controlled to move the head. A coarse actuator or headarm movably supports the fine actuator and is mounted on a frame for movement radially of the signal storage disk. The head scans tracks on the disk. A servo actuates the coarse actuator to follow the movements of the fine actuator. In a seek, the fine coarse actuator may not be able to follow the fine actuator resulting in the fine actuator hitting a safety stop. When this happens, seek errors occur. According to the invention, the relative displacement of the fine actuator with respect to the coarse actuator is limited during predetermined portions of a seek operation, i.e., the high speed accelerate and decelerate portions.
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公开(公告)号：US4519553A
公开(公告)日：1985-05-28
申请号：US626948
申请日：1984-07-02
申请人： Jesse L. Campbell , Alan A. Fennema , Robert B. Henderson , William G. Rance, Jr. , Paul H. Whittington , William O. Wightman, Jr.
发明人： Jesse L. Campbell , Alan A. Fennema , Robert B. Henderson , William G. Rance, Jr. , Paul H. Whittington , William O. Wightman, Jr.
IPC分类号： B65H19/28 , G11B23/113 , B31F5/04 , B65C3/12
CPC分类号： B65H19/28 , G11B23/113
摘要： Winding apparatus for continuously winding tape media upon reels contained within closed cartridges. The winding apparatus includes means for supplying cartridges alternatively to three separate in-line winding channels all of which perform a winding function and then collecting the wound cartridges off the individual lines and presenting an output station for a subsequent packing operation. Each channel includes vacuum extension means for reaching through an opening in each cartridge to apply an adhesive patch to the hub of the reel contained within the cartridge. Each line also includes means for continuously supplying tape media to a wind station for winding upon the reels passing through that line. At the wind station, additional vacuum means bring the leading edge of the media into the cartridge and press it against the adhesive patch, thereby attaching the media to the reel. Means are provided for winding the attached media upon the reel to one of the predetermined category of sizes, and then severing the media while maintaining control of the supply end for feeding it to the next cartridge. At a following station a leader block is applied to the trailing edge of the media associated with each completed reel to complete the winding operation. Cleaning and ID printing stations are also provided, if desired.
摘要翻译： 卷绕装置用于在包含在封闭的盒内的卷轴上连续卷绕带介质。 卷绕装置包括用于将三个单独的在线卷绕通道提供给三个单独的在线卷绕通道的装置，所述三个单独的在线卷绕通道执行卷绕功能，然后将卷绕的筒从各个线路收集并呈现用于随后的打包操作的输出站。 每个通道包括用于到达每个筒中的开口的真空延伸装置，以将粘合贴片施加到容纳在盒中的卷轴的轮毂上。 每条线还包括用于将卷带介质连续地供应到风站以绕过通过该线的卷轴的装置。 在风站，额外的真空装置将介质的前缘带入墨盒中并将其压靠在粘合贴片上，从而将介质附着到卷轴上。 提供了用于将附着的介质卷绕到卷轴上的预定类别的尺寸之一的装置，然后在维持供给端的控制以将其输送到下一个盒的同时切断介质。 在随后的站处，将引导块应用于与每个完成的卷轴相关联的介质的后缘以完成卷绕操作。 如果需要，还提供清洁和ID印刷站。
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10.发明授权公开(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。
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