Near field optical certifying head for disc asperity mapping
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United States of America Patent
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-
Sep 3, 2002
Grant Date -
N/A
app pub date -
Mar 24, 1998
filing date -
Oct 27, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical certifying head flies above a disc surface within an evanescent decay length of the disc surface. A light beam is focused through an objective lens, and further focused through a SIL. The SIL-focused light is coupled to the disc surface through near-field coupling. The light is reflected from the disc surface depending on a surface condition of the disc such that the surface condition can be determined.
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