Abrading – Abrading process – Glass or stone abrading
Reexamination Certificate
2006-01-31
2006-01-31
Wilson, Lee D. (Department: 3723)
Abrading
Abrading process
Glass or stone abrading
C451S036000, C451S180000, C451S439000, C029S424000, C428S043000
Reexamination Certificate
active
06991521
ABSTRACT:
The circumferential edges of glass or ceramic disks used in disk drive data storage devices are preferably finished by ductile grinding to produce an essentially fracture-free surface, which is not chemically strengthened. Preferably, the material is glass, and both the inner and outer edges of the disk are finished. Edge finishing is preferably achieved in a two-stage process, involving a coarse grind and a ductile grind, using air bearing spindles rotated at high speed for grinding wheels and workpiece. Preferably, the grinding wheels are shaped to provide a radius at the juncture of the circumferential edges and flat disk surfaces.
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Hagan James A.
Kruger Bruce Peter
Paurus David C.
Priebe Thomas E.
Hitachi Global Storage Technologies - Netherlands B.V.
Ojini Anthony
Truelson Roy W.
Wilson Lee D.
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