Optical surface detection for magnetic disks
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United States of America Patent
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Aug 26, 1997
Grant Date -
N/A
app pub date -
Mar 14, 1996
filing date -
Mar 14, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An automatic surface inspection apparatus comprises a light source that provides a coherent light beam that is spit and then recombined in a prism to generate an interference pattern. A cylindrical lens projects the interference pattern onto the surface of a disk as a line of light. A linear detection array converts the reflected line of light into an electrical signal that has a magnitude which varies dependent upon the reflected light intensity. Defects present on the surface of the disk cause variations in the reflected light intensity manifested as differences in the electrical signal output by the detection array.
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