Metal working – Method of mechanical manufacture – Electrical device making
Reexamination Certificate
2005-08-30
2005-08-30
Kim, Paul D. (Department: 3729)
Metal working
Method of mechanical manufacture
Electrical device making
C029S603130, C029S603140, C029S603150, C029S603160, C029S603180, C216S088000, C216S089000, C438S692000, C438S693000, C451S005000, C451S028000, C451S041000
Reexamination Certificate
active
06935013
ABSTRACT:
A lapping method utilizing textured and conditioned lapping plates most suitable for finishing magnetic heads resulting in improved surface quality, less sensitivity to electrical shorts due to smears, and reduced surface height difference between the head elements exposed at the slider air bearing surface. A rough lapping phase is followed by a polishing phase that maintains the same mechanical motion between the work piece and lapping plate but utilizes only the lapping plate without abrasives of any kind to polish the work piece surface, and to clean up any deep textured marks resulting from the diamond slurry phase. A conductive liquid is utilized to provide lubrication and to minimize static charge.
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“Effect of crystal orientation on lapping and polishing processes of natural quartz”; Guzzo, P.L.; De Mello, J.D.B.; Ultrasonics, Ferroelectrics and Frequency Control, 5 , Sep. 2000; pp.: 1217-1227.
Chang Yu-En Percy
Markevitch Yuri
McMaster Mark C.
Dillon & Yudell LLP
Hitachi Global Storage Technologies - Netherlands B.V.
Kim Paul D.
Martin Robert B.
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