Browse Prior Art Database

Magnetic Disk Assembly

IP.com Disclosure Number: IPCOM000081236D
Original Publication Date: 1974-Apr-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Dickie, HG: AUTHOR [+2]

Abstract

Fig. 1 shows a magnetic disk assembly for use in disk storage apparatus. The disk 1 is in the form of an annular ring and is clamped to a central circular hub 2 by a clamping ring 3, held in place by a number of evenly spaced clamping screws 4. The hub 2 is secured to a central spindle 5 which is supported for rotation by bearings 6 and 7.

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Magnetic Disk Assembly

Fig. 1 shows a magnetic disk assembly for use in disk storage apparatus. The disk 1 is in the form of an annular ring and is clamped to a central circular hub 2 by a clamping ring 3, held in place by a number of evenly spaced clamping screws 4. The hub 2 is secured to a central spindle 5 which is supported for rotation by bearings 6 and 7.

It has been found that the stress concentrations in the vicinity of the clamping screws 4 produces deformation of the disk 1.

The deformation takes the form of radial ripples which are magnified across the disk surface to a maximum at the outer edge. Difficulties are experienced in maintaining the necessary head-to-disk spacing required by current recording technology in the presence of these deformations.

The problem is mitigated by redistributing the stress more evenly in the clamping ring, by holes 8 radially disposed outside the clamping screws 4. Fig. 2 shows a plan view of the clamping ring 3, clearly showing relative position of the stress relieving holes 8 and the clamping screws 4. The size and shape of the holes 8 for best relieving the stress will clearly depend on the physical parameters of the particular apparatus in question, and need not be of the precise form shown in Fig. 2.

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