Fly height servo control of read/write head suspension

Details Fly height servo control of read/write head suspension Fly height servo control of read/write head suspension

1992-12-31

1994-12-27

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360109, G11B 2102

Patent

active

053770587

ABSTRACT:
The fly height of read/write heads in multiple disk drives is dynamically adjusted to optimum fly height by a servo loop. The fly height is sensed in real time with a harmonic ratio fly height detector and compared to an optimum or reference fly height. The suspension system of each head is adjusted in accordance with the departure of the fly height of that head from the optimum fly height. The adjustment of the suspension system is accomplished by bonding a piezoelectric film to the flexible suspension arm carrying each head. The fly height is corrected for both radial and circumferential error as the head changes radial and circumferential position relative to the disk surface. The reference fly height, to which each head is moved by the servo loop, may be selectively changed in the fly height servo operation. This can be done to lift the heads away from the disk surface during track seek mode or disk drive sleep mode. The reference fly height can also be changed to lower the heads towards the disk surface during error recovery mode.

REFERENCES:
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English Translation of JP #63-69075 to Mizuno, pp. 1-9 Mar. 29, 1988.
Gaudet et al "Head Flight Height Monitoring" IBM Technical Disclosure Bulletin vol. 11 No. 12 p. 1650 May 1969.

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