Browse Prior Art Database

Bistable Operation of Flexible Disk Pack

IP.com Disclosure Number: IPCOM000085297D
Original Publication Date: 1976-Mar-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Barbeau, RA: AUTHOR [+2]

Abstract

A pack of closely-spaced flexible disks rotating about a common axis, with centrifugally circulating air supplied at a controlled pressure, can be opened for transducing access in a bistable manner. Thus, the duration and magnitude of the force producing the opening can be reduced; lessening disk wear.

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Bistable Operation of Flexible Disk Pack

A pack of closely-spaced flexible disks rotating about a common axis, with centrifugally circulating air supplied at a controlled pressure, can be opened for transducing access in a bistable manner. Thus, the duration and magnitude of the force producing the opening can be reduced; lessening disk wear.

In earlier flexible disk pack arrangements havihg such bistable opening operation, a pump or other source of pressurization was required to develop pressure sufficient to drive the source air through porous mesh spacers between the recording disks. Such an arrangement is shown in Fig. 1. The mesh spacers have a one-inch inner diameter and a two-inch outer diameter, and the recording disks have a twelve-inch outer diameter. In such arrangements the central air pressure required for bistable opening operation is above atmospheric; hence the air pump is needed.

In this same configuration, bistable operation can be obtained with atmospheric/ambiently pressured air by decreasing the air flow resistance of the mesh spacers. Fig. 2 shows that this can be accomplished by enlarging the central hub space to a two-inch diameter, and utilizing mesh spacers having a difference of only a quarter-inch between inner and outer diameter dimensions.

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