| 摘要 |
PURPOSE:To enable uniform polishing of the upper and the under surface of a horizontally mounted magnetic recording medium without damage by a method wherein the tip of the upper air nozzle of an upper surface polishing part forms a horizontal plane, and the tip of the lower air nozzle of an under surface polishing part forms an up protruding curved surface. CONSTITUTION:The tip of an upper air nozzle 14 of an upper surface polishing part 10 forms a plane, and a polishing tape 3 is brought into contact with the upper surface of a magnetic recording medium 1 with a relatively wide area. The pressure of pressurized air injected through the upper air nozzle is dispersed to reduce a pressure per a unit area. As a result, the upper surface of a medium can be effectively prevented from damage due to polishing. Further, since the magnetic recording medium located at the upper surface polishing part makes contact with the polishing tape with a wide area, the contact time per a unit area of the medium can be increased. Thereby, the upper surface of the medium can be polished with high efficiency. The tip of a lower air nozzle 24 of an under surface polishing part 20 forms an up protruding curved surface, the polishing tape is forced into contact with the magnetic recording medium in a state to be pushed upward, a contact area therebetween is decreased, and the under surface of the medium is polished without damage. |
