发明名称 |
DISK SURFACE DEFECT INSPECTION METHOD AND APPARATUS |
摘要 |
The present invention provides a disk surface defect inspection method including: irradiating a laser beam from an oblique direction onto a disk surface being rotated; detecting intensities of a first light that is scattered with low-angle and a second light that is scattered with high-angle from minute concave and convex defects; determining that a defect is the minute convex defect if a ratio of the intensity of the first light to the intensity of the second light is constant; and determining that a defect is the minute concave defect if the ratio of the intensity of the first light to the intensity of the second light is changed.
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申请公布号 |
US2010246356(A1) |
申请公布日期 |
2010.09.30 |
申请号 |
US20100719598 |
申请日期 |
2010.03.08 |
申请人 |
HITACHI HIGH-TECHNOLOGIES CORPORATION |
发明人 |
FARIZ BIN ABDULRASHID;YANAKA YU;KATO KEIJI;ISHIGURO TAKAYUKI;SERIKAWA SHIGERU |
分类号 |
G11B20/18 |
主分类号 |
G11B20/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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