Automatic head tracking system utilizing transducer deflecting m

Details Automatic head tracking system utilizing transducer deflecting m Automatic head tracking system utilizing transducer deflecting m

1978-06-02

1979-08-07

Cardillo, Jr., Raymond F.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Synchronizing moving-head moving-record recorders

360 10, 360 77, H04N 578, G11B 2104, G11B 2110

Patent

active

041639944

ABSTRACT:
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 capacitance 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 oscillator providing a dither oscillation signal which, on application 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.

REFERENCES:
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patent: 3706861 (1972-12-01), Giel
patent: 3787616 (1974-01-01), Falk
patent: 4080636 (1978-03-01), Ravizza
patent: 4093885 (1978-06-01), Brown
patent: 4099211 (1978-07-01), Hathaway
patent: 4106065 (1978-08-01), Ravizza
patent: 4143405 (1979-03-01), Kubota
Nagai, Trackfollowing Servo-Apparatus, 5/74, Publication No. 20208/74.
Kaname, Electro-Acoustic Transducer, 9/70, Publication No. 26466/1970.
Mason et al., A Barium Titanate Transducer Capable of Large Motion at an Ultrasonic Frequency, Jour. of the Acoustical Soc. of Am., vol. 23, No. 2, 3/51, pp. 209-214.

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