Browse Prior Art Database

Flying Height Control in Disk File

IP.com Disclosure Number: IPCOM000040748D
Original Publication Date: 1987-Dec-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Draper, SW: AUTHOR

Abstract

In a magnetic disk file it is important that the height of a read write head flying close to a disk surface should remain constant. When a rotating actuator assembly is mounted with its axis angled with respect to a disk spindle, the flying height may be equalized across the disk by adjusting the angle. Alternatively a linear actuator arm may be angled with respect to a disk surface. Fig. 1 angles the actuator assembly axis of rotation relative to the disk such that the head tends to be closer to the disk when it is near the edge of the disk, when the disk is not rotating.

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Flying Height Control in Disk File

In a magnetic disk file it is important that the height of a read write head flying close to a disk surface should remain constant. When a rotating actuator assembly is mounted with its axis angled with respect to a disk spindle, the flying height may be equalized across the disk by adjusting the angle. Alternatively a linear actuator arm may be angled with respect to a disk surface. Fig. 1 angles the actuator assembly axis of rotation relative to the disk such that the head tends to be closer to the disk when it is near the edge of the disk, when the disk is not rotating. When the disk rotates, the aerodynamic effect of lifting the head of the disk surface is more apparent on the outside edge of the disk and it reduces as the head moves towards the center, due to the difference of linear speed of the disk surface along its radius. Hence, the angle of the actuator spindle can be adjusted to equalize the height of the head over the disk surface under operational conditions. The same principles would apply to a linear actuator assembly. The actuator assembly linear movement direction is angled in Fig. 2 relative to the plane of the disk to equalize the height of the head over the disk surface under operational conditions.

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