公开(公告)号：US5142516A

公开(公告)日：1992-08-25

申请号：US589709

申请日：1990-09-28

申请人： Alan A. Fennema

发明人： Alan A. Fennema

IPC分类号： G11B7/085 ,  G11B7/09 ,  G11B7/095

CPC分类号： G11B7/09 ,  G11B7/08505

摘要： A servo positioning system, such as used in an optical disk or other types of disk drives includes focus and positioning servo circuits. When a focus error is detected, then it is desired to stop the operation of the positioning system. Similarly, when a positioning error is detected, such as excessive speed or a non-zero velocity at the end of a seek or positioning motion, the head carriage should also be stopped. The stopping of the head carriage is by dynamic braking through use of a power amplifier which is switched from a transconductance mode used during normal servo positioning operations to a voltage amplifying mode which is set to a zero input for dynamically braking the servo positioning system to a safe speed and thence to a stop condition whereupon further error recovery procedures may be employed.

公开(公告)号：US5097361A

公开(公告)日：1992-03-17

申请号：US636871

申请日：1990-10-19

申请人： Edwin R. Childers ,  Alan A. Fennema ,  David P. McReynolds

发明人： Edwin R. Childers ,  Alan A. Fennema ,  David P. McReynolds

IPC分类号： G11B5/596 ,  G11B7/08 ,  G11B7/09 ,  G11B21/00 ,  G11B33/08

CPC分类号： G11B21/003 ,  G11B7/093

摘要： An optical disk recorder, or other apparatus, use a rotary actuator for supporting a work tool, such as an objective lens which is pivotable or rotatable without a pivot pin. Rotation causing or tracking coils on the rotary actuator are disposed adjacent to permanent magnets to selectively effect rotation of the rotary actuator about the pivot pin. A bias electrical current is supplied to these coils to generate magnetic fields which are in opposite rotational senses; such fields force the rotary actuator against the pin in such a manner that the point of contact between the rotary actuator and the pin follows the rotation of the actuator about the pin.

公开(公告)号：US5090002A

公开(公告)日：1992-02-18

申请号：US320197

申请日：1989-03-07

申请人： William W. Chow ,  Alan A. Fennema ,  Ian E. Henderson ,  Ronald J. Kadlec

发明人： William W. Chow ,  Alan A. Fennema ,  Ian E. Henderson ,  Ronald J. Kadlec

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.

公开(公告)号：US4839876A

公开(公告)日：1989-06-13

申请号：US123675

申请日：1987-11-23

申请人： Alan A. Fennema

发明人： Alan A. Fennema

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

CPC分类号： G11B21/083 ,  G11B7/08517

摘要： An optical disk recorder includes a position servo control loop for causing a beam of radiation to faithfully follow a track on the disk, jump from a current track to an adjacent track or to a small number of tracks away from the current track. Operation of the position servo loop is altered by selectively reversing the phase of a differentiated position error signal and integrating the differentiated position error signal for comparison with a sawtooth signal for moving the beam of radiation from the current track to an immediately adjacent track under continuous position servo control. Upon reaching the adjacent track, the sawtooth signal returns to a reference potential for initiating track following. The servo error between the integrated differentiated position error signal and the sawtooth signal is sufficiently small such that relaxation of the sawtooth signal does not cause any significant perturbations in the positioning servo loop operation. A velocity long seek servo can be substituted for the position servo loop for more rapid long seeks.

公开(公告)号：US06898221B2

公开(公告)日：2005-05-24

申请号：US10099414

申请日：2002-03-15

申请人： Jill D. Berger ,  Subrata K. Dutta ,  Alan A. Fennema ,  Olga A. Gorbounova ,  Stephen J. Hrinya ,  Fedor A. Ilkov ,  David A. King ,  Heather L. Tavernier ,  Alexander A. Tselikov

发明人： Jill D. Berger ,  Subrata K. Dutta ,  Alan A. Fennema ,  Olga A. Gorbounova ,  Stephen J. Hrinya ,  Fedor A. Ilkov ,  David A. King ,  Heather L. Tavernier ,  Alexander A. Tselikov

IPC分类号： H01S5/06 ,  H01S5/0687 ,  H04B10/155 ,  H01S3/13 ,  H01S3/10

CPC分类号： H04B10/504 ,  H01S5/0617 ,  H01S5/0687 ,  H04B10/503 ,  H04B10/506 ,  H04B10/564 ,  H04B10/572

摘要： An apparatus comprising a first reference element having an output power that varies monotonically with input frequency over an operating frequency range and receiving at least a portion of an output beam of light from an optical source. A second reference element having an output power that is frequency dependent receives at least a portion of the output beam of light. A first optical detector measures the power of a first reference beam of light from the first reference element. A second optical detector measures the power of a second reference beam of light from the second reference element. Electronic circuitry is coupled to the first and second optical detectors for receiving first and second reference signals therefrom and producing a coarse error signal for permitting coarse adjustment and a fine error signal for permitting fine adjustment of the frequency of the output beam of light.

摘要翻译： 一种装置，包括具有输出功率的第一参考元件，所述输出功率在工作频率范围内与输入频率单调变化，并且接收来自光源的输出光束的至少一部分。 具有频率依赖性的输出功率的第二参考元件接收输出光束的至少一部分。 第一光学检测器测量来自第一参考元件的第一参考光束的光焦度。 第二光学检测器测量来自第二参考元件的第二参考光束的光焦度。 电子电路耦合到第一和第二光学检测器，用于从其接收第一和第二参考信号，并产生用于允许粗略调整的粗略误差信号和用于允许微调输出光束的频率的精细误差信号。

公开(公告)号：US5499231A

公开(公告)日：1996-03-12

申请号：US339626

申请日：1994-11-15

申请人： Alan A. Fennema ,  Wayne I. Imaino ,  Hal J. Rosen

发明人： Alan A. Fennema ,  Wayne I. Imaino ,  Hal J. Rosen

IPC分类号： G11B7/00 ,  G11B7/0037 ,  G11B7/09

CPC分类号： G11B7/0037 ,  G11B7/0945 ,  G11B2007/0013

摘要： An optical disk drive with a multiple data layer optical disk uses computed axial velocity values of the data layers to optimize the interlayer transition of the focused light beam. In the preferred embodiment, the axial velocities of the data layers are computed for a set of radial and angular positions on the data layer surfaces using one of several techniques. The data layer axial velocity values are computed from the measured current values to the voice coil motor focus actuator or from the output of the detector that generates the focus error signal (FES). A routine is run at disk drive startup, or at various times during disk drive operation, to measure the coil current or FES at different radial and angular positions and compute the axial velocity values. The computed axial velocity values are then mapped into memory storage according to addresses corresponding to their radial and angular positions. When it is desired to move the focused light beam from one data layer (the initial or take-off data layer) to another data layer (the final or target data layer) the computed axial velocity values are retrieved for the radial and angular positions nearest the take-off and target sectors on the respective data layers. These velocity values are then used to modify the acceleration profile of the focusing lens so that the focused light beam arrives at the desired position on the target data layer with a velocity close to the target data layer axial velocity.

摘要翻译： 具有多数据层光盘的光盘驱动器使用计算出的数据层的轴向速度值来优化聚焦光束的层间转变。 在优选实施例中，使用几种技术之一，针对数据层表面上的一组径向和角度位置来计算数据层的轴向速度。 从测量的电流值到音圈电动机聚焦致动器或从产生聚焦误差信号（FES）的检测器的输出计算数据层轴向速度值。 在磁盘驱动器启动或在磁盘驱动器操作期间的不同时间运行例程来测量不同径向和角位置处的线圈电流或FES，并计算轴向速度值。 然后根据与其径向和角度位置对应的地址，将计算的轴向速度值映射到存储器存储器中。 当希望将聚焦的光束从一个数据层（初始或起飞数据层）移动到另一个数据层（最终或目标数据层）时，针对最近的径向和角度位置检索计算出的轴向速度值 各个数据层的起飞和目标部门。 然后使用这些速度值来修改聚焦透镜的加速度分布，使得聚焦光束以接近目标数据层轴向速度的速度到达目标数据层上的期望位置。

公开(公告)号：US5134602A

公开(公告)日：1992-07-28

申请号：US589135

申请日：1990-09-27

申请人： Francisco A. Baca ,  Alan A. Fennema ,  Reed A. Hancock ,  Glen A. Jaquette ,  Lawrence D. Tipton ,  Daniel J. Winarski

发明人： Francisco A. Baca ,  Alan A. Fennema ,  Reed A. Hancock ,  Glen A. Jaquette ,  Lawrence D. Tipton ,  Daniel J. Winarski

IPC分类号： G11B7/00 ,  G11B7/0037 ,  G11B7/004 ,  G11B7/09 ,  G11B7/125 ,  G11B11/105 ,  G11B19/04 ,  G11B19/28 ,  G11B27/36 ,  G11B33/10

CPC分类号： G11B7/126 ,  G11B11/10595 ,  G11B19/04 ,  G11B19/28 ,  G11B27/36 ,  G11B33/10 ,  G11B7/0037 ,  G11B7/0945

摘要： This disclosure deals with an optical disk recorder/player (drive) of the type that receives a removable disk for signal exchanging operations. Once a disk is inserted into the drive, the rotation of the disk begins a period of accelerating rotational speed called spin up. During spin up, the focus and tracking systems of the drive are calibrated. Once the disks reach a desired operating rotational speed, a menu is provided for determining when to calibrate a laser in the drive for recording operations. Such writing or recording calibration of the laser occurs at different times in accordance with the types of signal processing functions to be performed with respect to the particular disk. Description includes a media library in which a plurality of optical disk drives are controlled in a manner for minimizing access times to any optical disk within the media library.

公开(公告)号：US4998233A

公开(公告)日：1991-03-05

申请号：US155390

申请日：1988-02-12

申请人： Joseph H. DiMatteo ,  Alan A. Fennema ,  Benjamin C. Fiorino ,  Julian Lewkowicz

发明人： Joseph H. DiMatteo ,  Alan A. Fennema ,  Benjamin C. Fiorino ,  Julian Lewkowicz

IPC分类号： G11B7/085 ,  G11B7/09

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.