Rigid magnetic disc memory apparatus employing stepper motor dri

Details Rigid magnetic disc memory apparatus employing stepper motor dri Rigid magnetic disc memory apparatus employing stepper motor dri

1978-04-24

1979-08-07

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

360106, G11B 554, G11B 1700, G11B 548

Patent

active

041639960

ABSTRACT:
An open loop, stepper-motor-driven, rigid magnetic disc memory apparatus for use with a data processing system. A rigid magnetic disc with high track density is driven by a stepper motor in an open-loop fashion or without servomechanism control. The memory apparatus includes: band structure including a spring bias for coupling stepper motor drive to apparatus supporting magnetic heads above and/or below the spinning disc and for temperature compensating for disc/apparatus expansion and contraction; manually operable control for zeroing the magnetic heads, moving and locking them in the disc's landing zone as, for example, while in transit, and providing a travel limit to head movement when the memory apparatus is operating; keying apparatus for preventing erroneous insertion and mis-alignment of and damage to an optical transducer relative to an optical mask arranged to spin with the disc structure; shim apparatus for precisely positioning the magnetic heads in the spin axis direction; viscously-coupled inertia apparatus for damping the stepping motor's step-rotary motion; a device for employing spinning motion associated with the disc for cooling purposes; and other structure.

REFERENCES:
patent: 3500363 (1970-03-01), Shill
patent: 3518651 (1970-06-01), Kenney
patent: 4054931 (1977-10-01), Bolton

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