| 摘要 |
PURPOSE:To prevent the occurrence of scars and dust in a disk by constituting the title cartridge by means of an upper side case member having a protrusion in a center part and a lower side case member having the disk having the hub which is brought into contact with the protrusion of the upper side case member and a bank like boss on the periphery of a turn table insertion hole. CONSTITUTION:The cartridge consists of the upper side case member 11 having the protrusion 15 in the center part, the disk 13 having the hub 14 which is brought into contact with the protrusion 15 of the upper side case ember 11, and the lower side case member 12 having the bank like boss 16 on the periphery of the insertion hole of the turn table. Here, it is desirable to make the shape of the protrusion 15 in the upper side case member 11 to be a truncated cone or a sphere. Since the bank like boss 16 in the lower side case member 12 holds the disk 13 and the protrusion 15 in the upper side case member 11 puts pressure on the hub 14 fixed to the disk 13, gutter in the directions of a radius and the thrust of the disk 13 are regulated. Thus, the occurrence of the scars and dust in the recording medium of the disk can be prevented. |
