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Tri-rail Negative Pressure Air Bearing Design

IP.com Disclosure Number: IPCOM000121828D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 1 page(s) / 43K

Publishing Venue

IBM

Related People

Dorius, L: AUTHOR [+3]

Abstract

This disclosure describes a negative pressure-type air bearing design in a three-rail configuration. The design maintains the desirable aspects of the conventional negative pressure design (Figure 1) and the tri-rail taper flat design shown in Figure 2.

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Tri-rail Negative Pressure Air Bearing Design

      This disclosure describes a negative pressure-type air bearing
design in a three-rail configuration.  The design maintains the
desirable aspects of the conventional negative pressure design
(Figure 1) and the tri-rail taper flat design shown in Figure 2.

      This combined design (Figure 3) is comprised of three rails
connected by a leading edge cross bar, two identical shallow reliefs
on either side of a center rail which produces the negative pressure
gradients.  The air bearing has a full-width taper at the leading
edge to permit efficient compression of air resulting in rapid disk
take-off.

      The design has the characteristic high air bearing stiffness of
negative pressure air bearings providing for excellent slider-disk
compliance.  This results in dynamic spacing loss during accessing or
during crash stop which is significantly improved over the tri-rail
taper flat design. The slider has side rails which are relieved back
from the trailing edge to minimize exposure to the disk.  This
feature results in a design which is insensitive to roll moments
imparted by either the suspension or slider fabrication tolerances.

      The design has significant advantages over the conventional
negative pressure design in terms of fly height parametric
sensitivities including: pitch static attitude, roll static attitude,
crown, and etch depth.  The shallow etch depths promote better air
flow in the relie...