Electricity: motive power systems – Positional servo systems
Patent
1989-07-10
1990-04-03
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
318561, 318563, 360 7708, 360 7706, G05B 1300
Patent
active
049147250
ABSTRACT:
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.
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Belser Karl A.
Dounn Paul J.
Henderson Ian E.
Kadlec Ronald J.
Roberts Spencer D.
International Business Machines - Corporation
Ip Paul
Shoop Jr. William M.
Somermeyer Herbert F.
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