Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1980-06-17
1982-08-24
Wolff, John H.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 78, G11B 500, G11B 2110
Patent
active
043464130
ABSTRACT:
A magnetic head positioning servo arrangement for a system for recording or reproducing information on a flexible magnetic recording medium, the position of the head being adjustable, relative to the magnetic tracks of the recording medium, by means of an actuator, and each magnetic track being provided with at least one reference signal which, when sensed, provides information about the momentary position of the head and, in the case of mistracking, generates in a comparator circuit a control signal for the actuator which moves the magnetic head back over the center of the track, the reference signal consisting of at least one pair of pulse sequences which are recorded asymmetrically with respect to the center of the track and which, when sensed, produce increasing or decreasing signal pulses.
REFERENCES:
patent: 3185972 (1965-05-01), Sippel
patent: 4074328 (1978-02-01), Hardwick
patent: 4084201 (1978-04-01), Hack et al.
patent: 4157576 (1979-06-01), Hack et al.
patent: 4157577 (1979-06-01), Porter et al.
patent: 4209810 (1980-06-01), Ragle et al.
BASF - Aktiengesellschaft
Wolff John H.
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