Apparatus for polishing optical disk

Abstract

The present invention relates to a polishing apparatus for restoring an optical disk. The objects of the present invention are as follows: to obtain an equal pressure appropriately required for polishing; to correct the accuracy of parallelism between the rotation planes of an optical disk and a polishing sheet; to remove roundness formed on the outer edge of an optical disk and unevenness in polishing; and to prevent clogging of the surface of a polishing sheet by the active elimination of abrasive filings and an occurrence of scratches on the surface of an optical disk due to the clogging. For the purpose of achieving the above objects, in an apparatus for polishing an optical disk composed of a disk rotator A and a polishing mechanism B, the polishing mechanism B has an elastic mechanism D for elastically holding a polishing pad C, a polishing sheet of the polishing pad C has such an elasticity that the deformation amount Δx is 0.005 mm to 0.3 mm when the polishing sheet contacts the surface of the optical disk with a pressure required for polishing, the elastic mechanism D is constructed to have elasticity in the direction perpendicular to the rotation plane of the optical disk and rigidity in the direction parallel to the rotation plane of the optical disk, and the ratio of the disk angular speed ωa of the disk rotator A to the polishing sheet angular speed ωb of the polishing mechanism B is regulated to satisfy the range of 0.2<ωa/ωb<1.5.