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Flexible Disk Pack With Reduced Disk Flutter

IP.com Disclosure Number: IPCOM000088709D
Original Publication Date: 1977-Jul-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 3 page(s) / 58K

Publishing Venue

IBM

Related People

Wanek, DJ: AUTHOR

Abstract

The disk pack 10 includes a plurality of flexible magnetic disks 12 which are clamped between spacer washers 14 on a rotatable spindle 16. Each of the washers 14 (except for the uppermost and lowermost washers in pack 10 which have modified constructions as shown) has an upper, relatively small diameter portion 14a, a middle, relatively large diameter portion 14b and a lower portion 14c of intermediate diameter.

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Flexible Disk Pack With Reduced Disk Flutter

The disk pack 10 includes a plurality of flexible magnetic disks 12 which are clamped between spacer washers 14 on a rotatable spindle 16. Each of the washers 14 (except for the uppermost and lowermost washers in pack 10 which have modified constructions as shown) has an upper, relatively small diameter portion 14a, a middle, relatively large diameter portion 14b and a lower portion 14c of intermediate diameter. Each of the disks 12 is disposed on the relatively small diameter portion 14a of one of the washers 14 and is clamped between the middle large diameter portion 14b of a lower washer 14 and the intermediate diameter portion 14c of the washer 14 just above, and these portions 14b and 14c in contact with disks 12 function to decrease the flutter or movement on the peripheries of the disks, increase the stiffness of the disk pack 10, and increase the effective window or space between pairs of disks 12 in pack 10 into which an access arm or magnetic transducer may be moved for reading or writing on disks
12.

Spindle 16 is rotatably driven from any suitable source of motive power, and rigid plate 18 is fixed to spindle 16 beneath disk pack 10. Spacer washers 14 are clamped with respect to rigid plate 18 by any suitable clamping means, such as a nut threaded onto spindle 16. Plate 18 has air vent holes 18a, and disks 12 have vent holes 12a that are in alignment with holes 18a throughout pack 10.

Each of the disks 12 may be bonded, as by cement 20 shown in Fig. 2, if desired, at its inner diameter onto the respective washer portions 14a and 14c; however, the disk 12 should not be bonded to the washer portion 14b just below for any part of this portion 14b of greater diameter than the portion 14c just above the disk 12.

As shown in Fig. 3, each of disks 12 in an u...