Browse Prior Art Database

Large Surface Air Bearing for a Flexible Disc File

IP.com Disclosure Number: IPCOM000085578D
Original Publication Date: 1976-Apr-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 47K

Publishing Venue

IBM

Related People

Bajorek, CH: AUTHOR [+3]

Abstract

This air bearing is suitable for a 500-2000 track per inch magnetoresistive sensor head.

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Large Surface Air Bearing for a Flexible Disc File

This air bearing is suitable for a 500-2000 track per inch magnetoresistive sensor head.

A critical requirement for this head which contains a wide array of magnetoresistors as many as 50 elements side-by-side, is the achievement of a large area air bearing (approx. 1.5 x 1.5mm/2/) while ensuring noncontact flying heights smaller than 2,500 angstroms.

The bearing flies on a stack of flexible discs as well as a single flexible disc in a Bernoulli platform configuration. It is possible to achieve flying heights smaller than 2,500 angstroms over areas larger than 1 x 1 mm/2/ with this bearing.

The bearing is useful for a CROLYN* medium and ferrite based magneto- resistive heads.

The basic head assembly and geometry is depicted in Figs. 1A, B, and C. The optimized air bearing contour is depicted in Figs. 2 and 3. It is produced by conventional lapping and polishing techniques.

Figs. 1A shows a plan view of the head assembly with the metal housing 10 having a body 11 made of a suitable material such as ferrite, glass or silicon within which a head, not shown, is housed. Fig. 1B shows a front elevations of the assembly of Fig. 1A and Fig. 1C shows a right elevation of the assembly of Fig. 1A. The dimensions and contours are as shown in the drawing.

Fig. 2 shows the contour of the spherical cap 12 with a radius of about 1.90 inch of body 11 with its corners 14 shaped to provide a 7 degree arrow shoulder, as shown in Fig...