Defect inspecting apparatus for disc-shaped information recordin

Details Defect inspecting apparatus for disc-shaped information recordin Defect inspecting apparatus for disc-shaped information recordin

1990-05-11

1993-05-18

Richardson, Robert L.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

360 31, 369 53, 369 32, 369 59, G11B 700, G11B 2736, G11B 390

Patent

active

052126773

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.

REFERENCES:
patent: 4686563 (1987-08-01), Fountain et al.
patent: 4896227 (1990-01-01), Fountain et al.

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