| 摘要 |
IN A MAGNETIC RECORDING MEDIUM, SURFACE ROUGHNESS OF A GLASS SUBSTRATE (1) AND THE VARIATION OF THE SURFACE ROUGHNESS ARE SUPPRESSED TO THE PREDETERMINED RANGE. NAMELY, THE SURFACE ROUGHNESS (RMAX, RA, RQ) AND THE RELATION (RMAX/RA) BETWEEN RMAX AND RA ARE RESTRICTED TO THE PREDETERMINED RANGE. IN THIS EVENT, RA IS REPRESENTATIVE OF A CENTER-LINE MEAN ROUGHNESS, RMAX IS DEFINED AS A MAXIMUM HEIGHT REPRESENTATIVE OF A DIFFERENCE BETWEEN A HIGHEST POINT AND A LOWEST POINT AND RQ IS REPRESENTATIVE OF A ROOT MEAN SQUARE ROUGHNESS. THEREBY, CRYSTAL GRAINS OF AN UNDERLYING LAYER (2, 3, 5) AND A MAGNETIC (6) FORMED THEREON ARE EQUALIZED. SPECIFICALLY, THE SURFACE ROUGHNESS IS SPECIFIED BY RMAX 15 NM, RA 1 NM AND RQ 1.5 NM. FURTHER, THE RATIO BETWEEN THE SURFACE ROUGHNESS RMAX AND THE SURFACE ROUGHNESS RA IS SPECIFIED BY RMAX/RA 30. |
