G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.2
G11B 21/08 (2006.01) G11B 7/08 (2006.01) G11B 7/085 (2006.01)
Patent
CA 1309497
ABSTRACT OF THE DISCLOSURE 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 differen- tiated 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. TU987004
577711
International Business Machines Corporation
Saunders Raymond H.
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