Capacitive measurement and control of the fly height of a record

Details Capacitive measurement and control of the fly height of a record Capacitive measurement and control of the fly height of a record

1988-02-01

1990-06-05

Stephan, Steven L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360103, 324662, 324690, G11B 560, G11B 1732

Patent

active

049318870

ABSTRACT:
A device and method for capacitive measurement and control of the fly height of a recording slider. A recording slider is vertically spaced from a rotating disk surface by an "air bearing". The disk has a first electrically conductive pattern at its surface. The first pattern has an edge with a length extending, for example, radially. The recording slider has one or more electrically conductive rails extending transverse to the radial pattern on the rotating disk. As the disk rotates, the edge of the pattern on the disk scans across the rail of the slider. By measuring the electrical capacitance between the slider and the pattern on the disk, and by processing the electrical capacitance measurement signal, a vertical spacing signal proportional to the vertical spacing between the disk and the slider can be obtained.

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