Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Drum record
Patent
1978-04-24
1980-03-18
Eddleman, Alfred H.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Drum record
310 49R, 360 77, 360 78, 360109, G11B 555, G11B 548, G11B 2108, G11B 2122
Patent
active
041942264
ABSTRACT:
A rigid magnetic disc memory apparatus for use with a data processing system. A magnetic read/write head is accurately positioned parallel and adjacent to the plane of a rigid magnetic disc with high track density by a stepper motor in an open-loop fashion 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: 3199092 (1965-08-01), Hoffman
patent: 3500363 (1970-03-01), Shill
patent: 3609721 (1971-09-01), Meneley
patent: 3859662 (1975-01-01), Habich et al.
patent: 3864749 (1975-02-01), Stansell
patent: 3946439 (1976-03-01), Castrodale et al.
patent: 4071866 (1978-01-01), Butsch
patent: 4123675 (1978-10-01), Moskowitz et al.
B. C. Kuo, Theory and Applications of Step Motors, 1974, Damping by Use of Viscous Inertial Dampers, pp. 188-199.
Daugherty Lenn
Hinlein Sigmund
Kaseta Robert
Data General Corporation
Eddleman Alfred H.
Frank Jacob
Wall Joel
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