Keyed mounting for orienting optical angular, displacement trans

Details Keyed mounting for orienting optical angular, displacement trans Keyed mounting for orienting optical angular, displacement trans

1978-04-25

1980-11-18

Wolff, John H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 721, G11B 1928

Patent

active

042348994

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-rotarymotion; a device for employing spinning motion associated with the disc for cooling purposes; and other structure.

REFERENCES:
patent: 3391255 (1968-07-01), Gregg
patent: 3511151 (1970-05-01), Hillman
patent: 3600508 (1971-08-01), Dann et al.
patent: 3914789 (1975-10-01), Coker, Jr.
patent: 3984868 (1976-10-01), Ragle et al.
patent: 4006737 (1977-02-01), Cherry

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