G - Physics – 11 – B
Patent
G - Physics
11
B
352/21.1
G11B 19/00 (2006.01) G11B 15/467 (2006.01)
Patent
CA 1109146
ABSTRACT OF THE DISCLOSURE An automatic tracking servo control system which is adapted to control the tracking of at least one rotary signal reproducing transducer which scans successive parallel record tracks on a movable record medium. Position pulses are generated when the transducer rotates into predetermined position with respect to the record medium, and these positions pulses are used in conjunc- tion with control signals which are reproduced from the record medium and which had been recorded at spaced locations therealong in predeter- mined relation to the record tracks for controlling the position of the transducer with respect to the tracks scanned thereby. A detector detects the relative strength of the signal reproduced by the trans- ducer during periodic intervals. A phase shift circuit shifts the phase of the position pulses by a selected amount during successive scanning cycles of the transducer, this amount being periodically adjusted as a function of the difference between the relative signal strengths in successive periodic intervals. The phase-shifted posi- tion pulses are used in a servo circuit, together with the control pulses, to control the tracking of the rotary head.
312044
Nakamura Tadahiko
Nakano Kenji
Gowling Lafleur Henderson Llp
Sony Corporation
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