公开(公告)号：DE69016269T2

公开(公告)日：1995-07-13

申请号：DE69016269

申请日：1990-05-03

Applicant: IBM

Inventor： CHOW WILLIAM WAI-CHUNG ,  FENNEMA ALAN AUGUST ,  FIORINO BENJAIN CARMEL ,  HENDERSON IAN EDWARD ,  KADLEC RONALD JAMES ,  ROBERTS SPENCER DONALD

IPC: G05D3/12 ,  G11B7/085 ,  G11B11/105 ,  G11B21/08

公开(公告)号：DE69024866T2

公开(公告)日：1996-11-14

申请号：DE69024866

申请日：1990-07-10

Applicant: IBM

Inventor： BELSER KARL ARNOLD ,  DOUNN PAUL JOSEPH ,  HENDERSON IAN EDWARD ,  KADLEC RONALD JAMES ,  ROBERTS SPENCER DONALD

IPC: G05B19/23 ,  G11B7/085 ,  G11B7/09 ,  G11B21/08

Abstract: A track-seeking system for an optical disk using a velocity control loop with partially-digitized velocity measurement is described in which the sample period of the position error signal is varied in accordance with a velocity profile and a gain of the digital circuits is adjusted, also in accordance with the velocity profile, for providing optimum operation of the digitized portion of the velocity signal generator. In another aspect of the velocity-signal generation, the same digital circuit generates a velocity reference signal and a velocity error signal from a common desired velocity profile set of values.

公开(公告)号：DE69016269D1

公开(公告)日：1995-03-09

申请号：DE69016269

申请日：1990-05-03

Applicant: IBM

Inventor： CHOW WILLIAM WAI-CHUNG ,  FENNEMA ALAN AUGUST ,  FIORINO BENJAIN CARMEL ,  HENDERSON IAN EDWARD ,  KADLEC RONALD JAMES ,  ROBERTS SPENCER DONALD

IPC: G05D3/12 ,  G11B7/085 ,  G11B11/105 ,  G11B21/08

公开(公告)号：DE69020926T2

公开(公告)日：1996-03-14

申请号：DE69020926

申请日：1990-03-05

Applicant: IBM

Inventor： CHOW WILLIAM-WAI-CHUNG ,  FENNEMA ALAN AUGUST ,  HENDERSON IAN EDWARD ,  KADLEC RONALD JAMES

IPC: G11B21/10 ,  G05B19/23 ,  G05B19/39 ,  G05D3/12 ,  G11B7/085 ,  G11B7/09 ,  G11B11/105 ,  G11B21/08 ,  G11B7/08

Abstract: 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 means 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：DE69024866D1

公开(公告)日：1996-02-29

申请号：DE69024866

申请日：1990-07-10

Applicant: IBM

Inventor： BELSER KARL ARNOLD ,  DOUNN PAUL JOSEPH ,  HENDERSON IAN EDWARD ,  KADLEC RONALD JAMES ,  ROBERTS SPENCER DONALD

IPC: G05B19/23 ,  G11B7/085 ,  G11B7/09 ,  G11B21/08

Abstract: A track-seeking system for an optical disk using a velocity control loop with partially-digitized velocity measurement is described in which the sample period of the position error signal is varied in accordance with a velocity profile and a gain of the digital circuits is adjusted, also in accordance with the velocity profile, for providing optimum operation of the digitized portion of the velocity signal generator. In another aspect of the velocity-signal generation, the same digital circuit generates a velocity reference signal and a velocity error signal from a common desired velocity profile set of values.

公开(公告)号：DE69020926D1

公开(公告)日：1995-08-24

申请号：DE69020926

申请日：1990-03-05

Applicant: IBM

Inventor： CHOW WILLIAM-WAI-CHUNG ,  FENNEMA ALAN AUGUST ,  HENDERSON IAN EDWARD ,  KADLEC RONALD JAMES

IPC: G11B21/10 ,  G05B19/23 ,  G05B19/39 ,  G05D3/12 ,  G11B7/085 ,  G11B7/09 ,  G11B11/105 ,  G11B21/08 ,  G11B7/08

Abstract: 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 means 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.