Browse Prior Art Database

Bistable Flexible Disk Pack

IP.com Disclosure Number: IPCOM000085076D
Original Publication Date: 1976-Feb-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 74K

Publishing Venue

IBM

Related People

Barbeau, RA: AUTHOR [+3]

Abstract

Packs of multiple co-rotating flexible recording disks -- spaced slightly apart by spacer elements, and having centrifugally circulating air supplied at a controlled pressure -- have been noted earlier to be subject to bistable opening separation operation. In such operation a selected interface is widened sufficiently to accommodate a transducer, by a transiently applied "triggering" force of considerably less magnitude and duration than is required otherwise to effect separation.

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Bistable Flexible Disk Pack

Packs of multiple co-rotating flexible recording disks -- spaced slightly apart by spacer elements, and having centrifugally circulating air supplied at a controlled pressure -- have been noted earlier to be subject to bistable opening separation operation. In such operation a selected interface is widened sufficiently to accommodate a transducer, by a transiently applied "triggering" force of considerably less magnitude and duration than is required otherwise to effect separation.

This type of bistable operation is achievable in two different pack configurations characterized as 1) centrally ventilated, and 2) self-ventilated. In the centrally ventilated arrangement air supplied axially at above atmospheric pressure circulates through porous spacers between the recording disks. In the self-ventilating configuration (Fig. 1) air circulates through off-axis holes 2 in the recording disks 3 at ambient (atmospheric) pressure, bypassing nonporous small diameter spacer disks 4.

The self-ventilating configuration has certain advantages for bistable operation. One is that the air need not be pressured above atmospheric to achieve bistable operation; hence auxiliary pumping equipment is not needed. Another is that the ambient air at the outside diameter of the pack can be maintained at the same temperature and humidity as the air being returned to the interior space.

However, a problem with the self-ventilating configuration is that the openin...