Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1991-05-08
1993-08-31
Sikes, William L.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7802, 360 743, 360 84, G11B 2110
Patent
active
052414345
ABSTRACT:
The specification discloses a magnetic recording signal reproducing apparatus for controlling a magnetic tape and reproducing magnetic heads.
In the magnetic recording signal reproducing apparatus of the invention, a magnetic tape which is moved for magnetic heads attached to a rotary cylinder is traced by the magnetic heads and signals recorded on tracks of the magnetic tape are reproduced. A construction of the apparatus includes a tracking control system, a tape tension control system, and an apparatus for selectively switching operations of both of the control systems. The tracking control system includes: an apparatus, attached to the rotary cylinder, for moving the magnetic heads in the width direction of the tracks in accordance with a tracking signal; and an apparatus for sampling the signals detected by the magnetic heads, for comparing a preceding sampled value with a present sampled value, and for generating the tracking signal such that the present sampled value is larger than the preceding sampled value. The tape tension control system includes: an apparatus for detecting changes per predetermined time in levels of the signals detected by the magnetic head; an apparatus for giving a tension to the moving magnetic tape and for adjusting the tension in accordance with a tension control signal; and an apparatus for generating the tension control signal to adjust the tension according to change amounts per predetermined time of the signal levels to a reference value. Further, the switching apparatus includes switching means for receiving the signals detected by the magnetic heads and for selectively energizing either one of the tracking control system and the tape tension control system in accordance with the levels of the signals. Another magnetic recording signal reproducing apparatus according to the invention comprises: two magnetic heads arranged to a cylinder so as to simultaneously trace adjacent tracks; an apparatus, attached to the cylinder, for individually moving the two magnetic heads in the width direction of the tracks in accordance with a head position control signal; and an apparatus for generating the head position control signal to move the magnetic heads in the width direction of the tracks in a manner such that when the recorded signals are reproduced at a speed different from a tape moving speed upon recording, amplitude levels of the reproduction signals detected by the two magnetic heads locating at predetermined track positions have a relation of opposite phases.
REFERENCES:
patent: 4402023 (1983-08-01), Hiraguri
patent: 4513229 (1985-04-01), Kudelski
patent: 5053890 (1991-10-01), Namiki
Inaba Yuji
Nishijima Hideo
Okamoto Kaneyuki
Umehara Yoshiaki
Hitachi , Ltd.
Ouellette Scott A.
Sikes William L.
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