Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Reexamination Certificate
2007-05-08
2007-05-08
Davis, David (Department: 2627)
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
Reexamination Certificate
active
10090267
ABSTRACT:
A ceramic dynamic-pressure bearing includes a first member14having a cylindrical outer surface and a second member15having a cylindrical reception hole formed therein. The first member14is inserted into the reception hole. A radial dynamic-pressure gap is formed between the inner surface of the reception hole of the second member15and the outer circumferential surface of the first member14.The first member14and the second member15are formed of an alumina ceramic which contains an Al component in an amount of 90–99.5% by mass as reduced to Al2O3and an oxide-type sintering aid component in an amount of 0.5–10% by mass as reduced to an oxide thereof. The thrust dynamic-pressure gap definition surface of the second member which faces the thrust plate has a flatness of not greater than 3 μm or the thrust dynamic-pressure gap definition surface of the thrust plate which faces the second member has a flatness of not greater than 3 μm. Also disclosed is a hard disk drive having a motor including a motor rotation output section having the ceramic dynamic-pressure bearing.
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Ishikawa Hironobu
Sugiyama Atsutoshi
Davis David
NGK Spark Plug Co. Ltd.
Sughrue & Mion, PLLC
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