Patent ID: 6099388
Filing Date: 2000-08-08
Classification: B24B,G11B

Abstract:
A method for repairing a damaged compact disc to render it useable, the compact disc being of the type having digitally recorded data thereon, the data being readable by reading light reflected from the digitally recorded data through a reading surface of the disc, and the damage being a scratch on the reading surface, the method comprising the steps of:(a) providing a group of abrasive means of respective different coarseness grades ranging in increasing grades of coarseness from a first grade which is the least coarse grade,(b) selecting from the group of abrasive means an abrasive means of coarseness grade which is the next grade to the first grade,(c) subjecting a localized area on the reading surface adjacent to and including the scratch to a predetermined treatment regime with the selected abrasive means for removing material of the disc at the reading surface thereof in the localized area for reducing the damaging effect of the scratch,(d) if at the end of the predetermined treatment regime of step (c), the damaging effect of the scratch has not been reduced to an extent to repair the damage, an abrasive means is selected of coarseness grade next to the last selected grade in increasing order of coarseness, and steps (c) and (d) are repeated until the effect of the scratch has been reduced to the extent to repair the damage, or the localized area has been subjected to the predetermined treatment regime with the abrasive means of highest coarseness grade, and(e) on the damaging effect of the scratch being reduced to an extent to repair the damage the localized area is then sequentially subjected to the predetermined treatment regimes with the respective abrasive means of coarseness grades less than that of the last selected abrasive means, commencing with the abrasive means of coarseness grade which is the next grade to that of the last selected abrasive means through respective abrasive means in decreasing order of coarseness grade down to and including the first grade.