Bistable deflection separation of flexible disks

Details Bistable deflection separation of flexible disks Bistable deflection separation of flexible disks

G - Physics

11

B

352/24.31

G11B 5/012 (2006.01) G11B 5/60 (2006.01) G11B 17/02 (2006.01) G11B 17/22 (2006.01)

Patent

CA 1068398

BISTABLE DEFLECTION SEPARATION OF FLEXIBLE DISKS Abstract of the Disclosure Multiple (e.g. 500) ultra-thin flexible storage disks are stacked in a closely spaced configuration between circular end plates and arranged for rotation together with the plates about a common axis. Record- ing surfaces of the rotating disks are deflected to successively expand (open) and contract (close) a selected interface and thereby provide recording access at the expanded interface. Separation of the selected interfacing surfaces for access is facilitated by maintaining a predetermined air pressure between the contracted disks which conditions the rotation of the disks to bistability in the contracted position. Thus only a small initiat- ing force is required to expand any selected interface with the disks initial- ly contracted. This reduces disk wear. Expansion of a selected interface is accelerated (for shortening access time) by applying vacuum to the disks in synchronism with the initiating force. Advantageously recording surfaces on both sides of the expanded interface rotate in generally flat planar paths, simplifying track location when both surfaces are subject to record- ing usage.

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