Automatic head tracking system utilizing transducer...

G - Physics – 11 – B

Patent

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352/30.4

G11B 5/00 (2006.01) G11B 5/588 (2006.01)

Patent

CA 1106494

AUTOMATIC HEAD TRACKING SYSTEM ABSTRACT OF THE DISCLOSURE In an apparatus for reproducing video or other information signals recorded in a track on a magnetic tape or other record medium; a magnetic head or transducer is moved along the track for reproducing the information signals recorded therein while a bi-morph leaf which supports the head receives an electrical drive signal for deflecting the head in a direction transverse to that along the track. A deflection responsive signal is generated in correspondence to the deflection of the head from a rest position, for example, in response to varying the capaci- tance of a capacitor formed of a fixed electrode and a movable electrode on the bi-morph leaf. A control circuit for controlling the deflection of the head includes an oscill- ator providing a dither oscillation signal which, on appli- cation to the bi-morph leaf, causes transverse oscillation of the head about a null position, an envelope detector detecting the envelope of the reproduced output of the head, a multiplier for synchronously demodulating the detected envelope by means of the deflection responsive signal so as to obtain a tracking error signal accurately representative of the deviation of the null position of the head from the center of the track, and an adder adding the tracking error signal to the dither oscillation signal so as to provide therefrom the electrical drive signal and by which the null position of the oscillated head is aligned with the center of the track.

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