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Contoured Linear Pressure Pad for Fixed Spherical Head Recording an Flexible Disks

IP.com Disclosure Number: IPCOM000049416D
Original Publication Date: 1982-Apr-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Knappe, LF: AUTHOR [+2]

Abstract

Each of the Figs. 1 through 4 illustrates a diskette 6 within a jacket 7 which is retained by a collet 8 that cooperates with a spindle 9. Fig. 1 shows a linear pressure pad 10 with a head 11 positioned at the inner track radius, while Fig. 2 shows a linear pressure pad 10 with a head 11 positioned at the outer track radius. Figs. 3 and 4 show a contoured pressure pad 13 with the head 11 positioned respectively at the inner track radius and the outer track radius.

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Contoured Linear Pressure Pad for Fixed Spherical Head Recording an Flexible Disks

Each of the Figs. 1 through 4 illustrates a diskette 6 within a jacket 7 which is retained by a collet 8 that cooperates with a spindle 9. Fig. 1 shows a linear pressure pad 10 with a head 11 positioned at the inner track radius, while Fig. 2 shows a linear pressure pad 10 with a head 11 positioned at the outer track radius. Figs. 3 and 4 show a contoured pressure pad 13 with the head 11 positioned respectively at the inner track radius and the outer track radius.

The jacket constraint and clamping constraint on a flexible disk causes the "contact area" between the fixed spherical head 11 and the flexible disk 6 to move inward as shown in Fig. 1. This inward radial displacement of the "contact area" for inner tracks is caused by the resulting disk deformation pattern.

The jacket constraint and free constraint on the outer edge of the disk causes the "contact area" between the fixed spherical head 11 and flexible disk 6 to move radially outward on the outer tracks (Fig. 2). This outward radial displacement of the "contact area" is also caused by the disk deformation pattern.

The proposed design change of the linear pressure pad is to contour the pressure pad surface 14 in the radial direction to compensate for the radial shift of the "contact area" (Figs. 3 and 4). The linear pressure pad contact surface 14 is then convex in the radial direction. The amount of curvature required is ...