| 摘要 |
PURPOSE:To prevent the attraction of a substrate to a head and to obtain a good surface roughness after a treatment by adjusting the grain size number of abrasive grains and the relative speed of polishing in accordance with prescribed equation. CONSTITUTION:The magnetic disk substrate 1 made of pure titanium rotates at a specified speed and a texturing and polishing tape 2 is driven at the average circumferential speed of the part corresponding to a tape width and is brought into contact with the substrate 1 by a contact hole 3. The tape 2 is formed of a base tape 21 and an abrasive grain layer 22 thereon and forms polishing grooves 4 on the substrate 1 by the abrasive grains embedded in the layer 22. The grain size number X of the abrasive grains and the relative speed Ymm/min of the texturing and polishing to the substrate 1 satisfy the equation, Y>{(X-7,000)<2>/(9X10<5>)}+350, X>3,000. The relation between the grain size number of the abrasive grains and the average grain size is defined in conformity with JIS-R6002. |
