G - Physics – 11 – B
Patent
G - Physics
11
B
352/24.3
G11B 19/20 (2006.01) G11B 5/54 (2006.01) G11B 23/02 (2006.01)
Patent
CA 1120150
COOLING APPARATUS FOR SPINNING MAGNETIC DISC MEMORY APPARATUS ABSTRACT OF THE DISCLOSURE 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 tem- perature compensating for disc/apparatus expansion and contrac- tion; 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 damag to an optical transducer relative to an optical mask arranged to spin with the disc structure; shim apparatus for precisely posi- tioning 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.
324432
Chastain David
Daugherty Lenn
Hinlein Sigmund
Kaseta Robert G.
Data General Corporation
Macrae & Co.
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