Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1990-07-02
1992-06-30
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 13, 360 7713, G11B 1546, G11B 15467
Patent
active
051268949
ABSTRACT:
A servo circuit for a capstan motor has an element for recording a position detecting signal on a medium transported by the capstan motor, a magnetic head for reproducing the position detecting signal, a position detecting circuit for detecting a position error signal, a pulse generator for a pulse signal, a velocity detecting circuit for a velocity error signal, a phase comparator for comparing the phase of a clock signal and pulse signal and for outputting a phase error signal, a switch for selectively outputting the position error signal or the phase error signal, and a velocity control element for controlling the capstan motor by a velocity control signal. The servo circuit comprises a signal holding element connected in series to a signal supply path from the position detecting circuit to the velocity control element via the switch; a comparator circuit for outputting a detection signal when the phase error signal is within a predetermined level range; a holding control element responsive to the detection signal for controlling the signal holding element in a manner that in the case where the servo circuit is transited to a recording mode, until a transporting speed of the medium sufficiently reaches a predetermined speed, the signal holding element is caused to be in a passing state and then to enter a holding state, and when the signal holding element is caused to return to the passing state.
REFERENCES:
patent: 4899233 (1990-02-01), Yoshida
Garland Steven R.
Psitos Aristotelis
Victor Company of Japan Ltd.
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