G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.2
G11B 7/00 (2006.01) G05B 19/23 (2006.01) G11B 7/085 (2006.01) G11B 7/09 (2006.01) G11B 21/08 (2006.01)
Patent
CA 2013058
?U9-88-008 ABSTRACT OF THE DISCLOSURE 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.
Belser Karl Arnold
Dounn Paul Joseph
Henderson Ian Edward
Kadlec Ronald James
Roberts Spencer Donald
International Business Machines Corporation
Na
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