Automated Inspection Of Magnetic Media By Laser Scanning

Pedro Lilienfeld; Sergey Broude; Eric Chase; George Quackenbos

doi:10.1117/12.966270

19 December 1985 Automated Inspection Of Magnetic Media By Laser Scanning

Pedro Lilienfeld, Sergey Broude, Eric Chase, George Quackenbos

Proceedings Volume 0557, Automatic Inspection and Measurement; (1985) https://doi.org/10.1117/12.966270
Event: 29th Annual Technical Symposium, 1985, San Diego, United States

Abstract

Two automated laser scanning systems have been developed for the rapid inspection of flexible and rigid magnetic recording disks. Surface defect characterization is performed by means of the detection of light scattering pulses produced by a wide range of surface or near-surface physical defects. These imperfections are highly correlated with magnetic defects associated with data drop-outs. In addition, surface irregularities can result in transient air bearing discontinuities which cause read/write data errors and head disk interference. The inspection systems described in this paper include complete robotic disk handling subsystems with computer control for all inspection parameters. The automated inspection process is performed within a self-contained clean-room environment to preclude disk contamination. Disks are classified and physically segregated into several "quality" groupings in accordance with user-selected criteria combining the number and size of defects. Complete disk inspection of flexible media is performed in 3 to 5 seconds, and in 30 to 45 seconds for rigid media, depending on operating parameters. The minimum detectable defect size for rigid disks is of the order of one micrometer, and 5 to 15 micrometers for flexible disks.

Citation Download Citation

Pedro Lilienfeld, Sergey Broude, Eric Chase, and George Quackenbos "Automated Inspection Of Magnetic Media By Laser Scanning", Proc. SPIE 0557, Automatic Inspection and Measurement, (19 December 1985); https://doi.org/10.1117/12.966270

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