Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1985-05-31
1986-08-26
Stellar, George G.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
358310, 360 77, G11B 555
Patent
active
046086137
ABSTRACT:
Apparatus for a rotary magnetic recording medium includes a magnetic head for sensing signals from tracks which are formed on a rotary magnetic recording medium in such a manner that the front end of a recording operation continues positionally equal to the last end thereof; a head move device for movably supporting the magnetic head; a control unit for controlling the head move device to move the magnetic head onto a desired one of the tracks so as to perform a tracking operation, and a first detect device for detecting an envelope of signals obtained by the magnetic head. The control unit, in order to cause the head move device to move the magnetic head from a reference position specified as the reference for moving the magnetic head to a track next to the reference position, monitors a level of the envelope detected by the first detect device each time the head has traveled a first predetermined distance while the magnetic head is moved, and controls the head move device, when the level monitored exceeds a predetermined value, to move the magnetic head from the current position of the magnetic head by a second predetermined distance. The second predetermined distance is set substantially corresponding to a distance from a peak position of an envelope waveform of signals recorded on the magnetic recording medium to a position at which the predetermined value is attained.
REFERENCES:
patent: 4333116 (1982-06-01), Schoettle et al.
patent: 4485418 (1984-11-01), Bremmer
patent: 4499510 (1985-02-01), Harding et al.
patent: 4544969 (1985-10-01), Painton
IBM Technical Disclosure Bulletin, vol. 19, No. 4, Sep. 1976, pp. 1393-1395, Head-To-Track Synchronizing Mechanism for Magnetic Disks, Porter et al.
IBM Technical Disclosure Bulletin, vol. 22, No. 11, Apr. 1980, pp. 5103-5104, Flexible Disk File Recalibrate Procedure, Case et al.
Fuji Photo Film Co. , Ltd.
Stellar George G.
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