Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Synchronizing moving-head moving-record recorders
Patent
1978-06-02
1979-10-23
Eddleman, Alfred H.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Synchronizing moving-head moving-record recorders
360 77, 360107, 360109, G11B 552, G11B 2110, G11B 2118
Patent
active
041722655
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 signal is generated in correspondence to the deflection of the head from a rest position by a circuit which includes a strain gauge fixed 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 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:
patent: 3375331 (1968-03-01), Okazaki et al.
patent: 4099211 (1978-07-01), Hathaway
patent: 4106065 (1978-08-01), Ravizza
Ohba Takeo
Sakamoto Hitoshi
Wakisaka Yoshiaki
Eddleman Alfred H.
Eslinger Lewis H.
Sinderbrand Alvin
Sony Corporation
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