G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 33/02 (2006.01) G11B 5/48 (2006.01) G11B 5/60 (2006.01) G11B 19/02 (2006.01) G11B 19/20 (2006.01) G11B 20/18 (2006.01) G11B 33/08 (2006.01) G11B 33/12 (2006.01)
Patent
CA 2109249
MAGNETIC DISK DRIVE UNIT Abstract of the Invention: A high capacity, high speed memory system is presented. The system comprises a disk drive cartridge and an electronics unit. The disk drive cartridge comprises five magnetic hard disks having 300 megabytes of usable capacity housed in a hermetically sealed, self-contained unit suitable for use in extreme environments of vibration, shock and temperature. The electronics unit comprises a metal structure wherein the electronics for the system are housed. The disk drive cartridge has a stationary spindle to which a motor stator assembly is attached. A motor rotor assembly is constituted by a rotary hub mounted around the stator, the hub having a motor magnet mounted therein. Upper and lower bearing assemblies are positioned between the stator and the rotor. This assembly is preloaded by a pair of canted springs which are disposed about the spindle and bear against the floating race of the upper bearing assembly. Preloading the assembly in this manner avoids abrupt contact between the bearing and the spindle shaft during vibrations. These abrupt contacts have been found to generate head position errors during vibration. These head position errors are outside the bandwidth of typical prior art closed loop servos. However, due to the increased capacity of the present invention a higher bandwidth is utilized. Accordingly, the canted springs of the present invention prohibit the abrupt contacts, thereby eliminating the head errors that would otherwise result.
Richard David W.
Staehly Christopher E.
Raymond Engineering Inc.
Swabey Ogilvy Renault
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