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    2.
    发明专利
    未知

    公开(公告)号：DE2648396A1

    公开(公告)日：1977-05-18

    申请号：DE2648396

    申请日：1976-10-26

    Applicant: IBM

    Inventor： KOSKI JOHN ALEXANDER ,  LISSNER RUDOLF WERNER ,  ROBERTS SPENCER DONALD

    IPC: G05D13/62 ,  B65H23/18 ,  B65H77/00 ,  G11B15/30 ,  G11B15/43 ,  G11B15/46 ,  G11B15/48 ,  G11B15/54 ,  G11B27/13

    Abstract: A reel-to-reel web (tape) transport apparatus which has no tape length buffering between the supply and take-up reels. The tape follows a fixed length path from the supply reel, past a read/write head and guides, to a take-up reel. A two motor control mechanism is employed in which one motor drives the take-up reel and one motor drives the supply reel to maintain the appropriate tension and tape motion at the read/write head. The control mechanism is adaptive to dynamic changes as the tape is moved from the supply reel to the take-up reel. Three quantities are monitored: lineal tape position and the angular reel displacement of the supply and take-up reel. From these quantities reel radii are derived, tape inertia calculated and the velocity or position error is determined. A motor current algorithm is utilized to generate the appropriate torque for each reel to drive the control error to zero along a predetermined profile with negligible tape tension disturbances. The result is a reel-to-reel tape drive with static and dynamic performance characteristics which are independent of reel radius and inertia changes resulting from tape motion.

    4.
    发明专利
    未知

    公开(公告)号：DE2319713A1

    公开(公告)日：1973-10-25

    申请号：DE2319713

    申请日：1973-04-18

    Applicant: IBM

    Inventor： MITCHELL JOHN ORVILLE ,  ROBERTS SPENCER DONALD ,  PELT RICHARD WARREN VAN

    IPC: H02P3/10 ,  G05B19/23 ,  G05D3/12 ,  G11B15/48 ,  H02P7/288

    Abstract: A motor, moving at a known speed, is stopped in a controlled manner by a speed control servomechanism which compares the actual speed-versus-distance deceleration profile to an optimum or desired speed-versus-distance deceleration profile, and variably controls the reverse energization, or plugging, of the motor in a manner devised to achieve the desired profile. When the speed servo has reduced motor speed to a low level, and preferably zero, a stop-lock control servomechanism is enabled to position and maintain the motor at a preselected stop-lock position. The stop-lock servo implements a motor-control algorithm which, for a given position error, provides a higher magnitude motor energization when the motor is moving away from the stop-lock position than when the motor is moving back toward the stop-lock position. This control algorithm provides increased servo gain when the motor is moving away from the stop-lock position.

    5.
    发明专利
    未知

    公开(公告)号：DE69121478T2

    公开(公告)日：1997-02-13

    申请号：DE69121478

    申请日：1991-05-29

    Applicant: IBM

    Inventor： FENNEMA ALAN AUGUST ,  ROBERTS SPENCER DONALD

    IPC: G02B7/28 ,  G02B7/18 ,  G11B7/085 ,  G11B7/09

    Abstract: The present invention relates to a focusing system for a moveable lens comprising a moveable lens (10), moving means (15,16) for moving the lens, and a control system (20, 21, 22, 23) for supplying position control signals 24) to the moving means and for detecting when the lens is in an in-focus position. According to the invention the focusing system is characterised in that the control system comprises means for supplying a ramp position control signal to the moving means to move the lens into an in-focus position, and modulating means for modulating the ramp position control signal so that it becomes a series of pulses.

    6.
    发明专利
    未知

    公开(公告)号：DE69121478D1

    公开(公告)日：1996-09-26

    申请号：DE69121478

    申请日：1991-05-29

    Applicant: IBM

    Inventor： FENNEMA ALAN AUGUST ,  ROBERTS SPENCER DONALD

    IPC: G02B7/28 ,  G02B7/18 ,  G11B7/085 ,  G11B7/09

    Abstract: The present invention relates to a focusing system for a moveable lens comprising a moveable lens (10), moving means (15,16) for moving the lens, and a control system (20, 21, 22, 23) for supplying position control signals 24) to the moving means and for detecting when the lens is in an in-focus position. According to the invention the focusing system is characterised in that the control system comprises means for supplying a ramp position control signal to the moving means to move the lens into an in-focus position, and modulating means for modulating the ramp position control signal so that it becomes a series of pulses.

    7.
    发明专利
    未知

    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.

    8.
    发明专利
    未知

    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.

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