Head tracking control system

Details Head tracking control system Head tracking control system

1981-05-04

1983-09-13

Wolff, John H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 70, 360107, 360109, G11B 552, G11B 2110, G11B 2118

Patent

active

044046057

ABSTRACT:
A video tape recording/reproducing apparatus for reproducing video signals recorded in successive parallel tracks on a magnetic tape includes a magnetic head for scanning the tracks to reproduce the signals recorded therein; a bi-morph leaf for deflecting the head in a direction transverse to the direction along the tracks; a controllable oscillator for supplying a wobbling signal to the bi-morph leaf so as to cause the latter to deflect the head to oscillate in a transverse direction with respect to the tracks, whereby the signals reproduced by the head are amplitude modulated at the frequency of the wobbling signal; a tracking error detecting loop for supplying a tracking error signal, corresponding to deviation of the head from the respective track being scanned, to the bi-morph leaf so as to control the latter to correct the deviation; and a signal detecting loop for detecting the fundamental and second harmonic components of the amplitude modulated signals reproduced by the head and for controlling the amplitude of the wobbling signal from the controllable oscillator in response to a ratio of the levels of the second and fundamental harmonic components so as to reduce the amplitude of the wobbling signal for small tracking errors and to increase the amplitude of the wobbling signal for large tracking errors.

REFERENCES:
patent: 2855464 (1958-10-01), Wiegand
patent: 2870267 (1959-01-01), Duinker et al.
patent: 4163994 (1979-08-01), Sakamoto et al.
patent: 4172265 (1979-10-01), Sakamoto et al.
patent: 4223358 (1980-09-01), Kubota et al.
patent: 4251838 (1981-02-01), Saito

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