Shaft for fluid dynamic bearing, fluid dynamic bearing device, and method of manufacturing the shaft
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United States of America Patent
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Jun 5, 2007
Grant Date -
Apr 14, 2005
app pub date -
Oct 1, 2004
filing date -
Feb 4, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a method of manufacturing a shaft for the fluid dynamic bearing device, the shaft is formed with a plurality of grooves arranged in and around the external circumference, the surface of the grooves and external circumference with uniform roughness, and machined marks on the surface aligned in the circumferential direction, by controlling the relative vibration of a rod-shaped blank to be machined as the shaft for a fluid dynamic bearing and a grinding wheel (a machining tool) to grind the external circumference of the blank.
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