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US 5,212,677 AGranted
Defect inspecting apparatus for disc-shaped information recording media
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsYuuji Shimote, Mitsuo Fukuda, Masafumi Ototake, Koji Shindo
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Abstract
An apparatus which inspects disc-shaped information recording media, such as optical disks and magnetic disks, in a single reproduction. The apparatus detects the type of defect and classifies the defects into defect clusters by the defect position in the radial and circumferential directions. Type of defect or defect cluster, position and size are memorized.
Claims10
A defect inspection apparatus for disc-shaped information recording media, comprising:
- means for detecting defects by using a reproduced signal from a disc-shaped information recording medium,
- means for detecting a type of detected defect,
- means for detecting a position of the detected defect in radial and circumferential directions,
- means for grouping the defects into clusters of defects by the detected positions,
- means for calculating dimensions of the defect cluster in radial and circumferential directions, and
- means for storing information regarding the type, position and dimensions of the detected defects or defect clusters.
3 more elements
Dependencies are inferred from the claim text.