Optical surface detection for magnetic disks

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United States of America Patent

PATENT NO 5661559
SERIAL NO

08616103

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Abstract

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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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Patent Owner(s)

Patent OwnerAddress
PHASE METRICS INC10260 SORRENTO VALLEY ROAD SAN DIEGO CA 92121

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Brezoczky, Blasius San Jose, CA 11 203
Pogrebinsky, Vladimir San Jose, CA 46 994

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