Apparatus and method for reducing disc surface asperities to sub-microinch height
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United States of America Patent
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Aug 14, 2001
Grant Date -
N/A
app pub date -
Sep 22, 1999
filing date -
Sep 23, 1998
priority date (Note) -
Expired
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Abstract
A honing head for microburnishing surface of a recording/reproducing disc to a smoothness at which asperities are limited to submicron heights including a hardened contact bearing surface having an array of depressions with abrupt trailing edges interconnected by recessed channels leading outwardly from the honing head. The array of channels span a band in which an asperity may be present, and the sharp edges shear off the asperities within the band which extend above the chosen submicroinch height, with the separated particulates being passed through the recesses and channel system to the outer edge of the honing head. The trailing edges act to shear off the unwanted heights of the asperities, while the recesses enable pressure differentials and air flows to direct the separated particulates outwardly relative to the disc, centripetal forces of rotation bearing the particulates from the disc. A diamond-like coating on the entire contact bearing surface and the recesses aids in reducing wear and the stiction of the smooth surfaces to the disc that is being burnished. This arrangement has the further advantage that the honing head may be prepared by photomicrolithographic techniques to generate the array of recesses on a production basis, with the recesses having precisely determined depths and perpendicular trailing edge walls. Ion milling and other known techniques can be used to remove the materials in the chose patterns quickly and efficiently.
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- SEAGATE TECHNOLOGY LLC
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Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Liners, William O | Minnetonka, MN | 4 | 145 |
Schaenzer, Mark J | Eagan, MN | 28 | 579 |
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Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
---|---|---|---|
Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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