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Substrate Defect Detector Disclosure Number: IPCOM000041031D
Original Publication Date: 1987-May-01
Included in the Prior Art Database: 2005-Feb-02

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Bowen, AJ Sherratt, SJ [+details]


One of the problems which can appear during the manufacture of magnetic disk substrates is the presence of small pits, scratches, and diamond turn pull-outs less than 10 microns in width. The above substrate defect detector determines the size of defects located on magnetic disk substrates and plated magnetic disks. The detector utilizes low power laser light to detect incongruities on disk surfaces.