Method and apparatus for cleaning cylindrical outer surface of a disk for manufacturing disk-type information recording medium and a disk-type information recording medium made by using a disk cleaned by said method or apparatus

摘要

A method of cleaning a cylindrical outer surface of a disk which comprises a disk-type substrate having an organic dye layer on its surface for manufacturing a disk-type information recording medium, said method comprising the steps of intermittently or continuously moving a long cleaning belt along a desired path in its longitudinal direction to give a virgin portion thereof, supplying a solvent capable of dissolving organic materials forming the organic dye layer to the virgin portion of the cleaning belt, setting a disk on a rotatable cleaning table, removing the organic material away from the cylindrical outer surface of the disk by contacting the surface with the cleaning belt supplied with the solvent while rotating the disk, and taking the disk off the cleaning table.;An apparatus for carrying out this method comprises means for feeding a cleaning belt, means for moving said belt in the longitudinal direction along a desired path, means for taking in the belt, means for supplying a solvent capable of dissolving organic materials forming the dye layer to the cleaning belt, a cleaning table on which a disk to be processed is set and which can rotate said disk around its central axis, means for contacting the cleaning belt wetted by the solvent with the cylindrical outer surface of the disk on the cleaning table and means for controlling the operation of each of said means. Preferably the apparatus further comprises a mechanism for moving backwardly the used cleaning belt and a mechanism for moving at least either one of the cleaning belt and a disk to be processed in such a direction as to traverse the cleaning belt, thereby allowing a virgin portion of the belt to be come into contact with the cylindrical outer surface of the disk.