Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Patent
1997-03-20
1998-12-08
Evans, Jefferson
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
360 9912, G11B 1702
Patent
active
058479007
ABSTRACT:
A disk clamping device in a magnetic disk drive includes a clamper which presses an uppermost one of a plurality of magnetic recording disks and a clamping force transmission member which presses the clamper against the uppermost magnetic recording disk. A material having a small Young's modulus, such as a polymeric material and a super elastic material, is used for the clamper or the clamping force transmission member, or both of them. The device may include a shim whose Young's modulus is larger than that of the clamper. The clamping force of the clamper is transmitted to the uppermost disk through the shim. The arrangement makes it possible to reduce the variations in the clamping force caused by a lack of manufacturing precision or a change in temperatures and to provide a stable clamping force. The uniform clamping force reduces the occurrence of undulation in the disks otherwise caused by the circumferential clamping force differences in the clamper.
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IBM Technical Disclosure Bulletin; vol. 20, No. 10, Mar. 1078; Beye; "Eliminating Clamp-Induced Stresses in Disk Stacks".
IBM Technical Disclosure Bulletin; vol. 25, No. 3A, Aug. 1982; Prater; "Clamping of Magnetic Disk Stack with a Top Ring".
IBM Technical Disclosure Bulletin; vol. 22, No. 12, May 1980; Bosier et al; "Magnetic Disk Assembly".
Evans Jefferson
NEC Corporation
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