Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1988-09-12
1992-04-14
Psitos, Aristotelis
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7704, 360 7804, G11B 558, G11B 5596
Patent
active
051053187
ABSTRACT:
A head positioning device for use in a magnetic disk equipment includes a position detector for detecting the deviation of a magnetic head from the center line of a desired track on a magnetic disk, a comparator for generating a polarity signal indicative of the direction of the deviation of the magnetic head from the center line of the desired track, on the basis of the output of the position detector, and a microcomputer for calculating a correction value necessary for the precise positioning of the magnetic head on the center line of the desired track. An optimum correction value is determined for each of a plurality of tracks on the basis of measurement, immediately after the power supply of the magnetic disk equipment has been turned on, and an actuator mounted with the magnetic head is driven on the basis of the correction values thus obtained, to position the magnetic head very accurately.
REFERENCES:
patent: 4135217 (1979-01-01), Jacques et al.
patent: 4536809 (1985-08-01), Sidman
patent: 4594622 (1986-06-01), Wallis
patent: 4616276 (1986-10-01), Workman
patent: 4814909 (1989-03-01), Brown et al.
patent: 4969059 (1990-11-01), Volz et al.
IBM TDB vol. 19 No. 6, "Self-Calibrating Disk Storage Apparatus", Griffiths et al., 11/76, pp. 1991-1992.
Haruna Toshiyuki
Kojima Akira
Tsuneta Katsuhiro
Yoshida Yuji
Garland Steven R.
Hitachi , Ltd.
Psitos Aristotelis
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