Bistable deflection separation of flexible disks

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

1974-07-01

1976-02-03

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

346137, 360 86, 360 98, 360105, G11B 5012, G11B 560, G11B 1722, G11B 2108

Patent

active

039368807

ABSTRACT:
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. Recording 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 initiating force is required to expand any selected interface with the disks initially 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 recording usage.

REFERENCES:
patent: 3226701 (1965-12-01), Masson
patent: 3509553 (1970-04-01), Krijnen
patent: 3618055 (1971-11-01), Van Acker et al.

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