| 摘要 |
PURPOSE:To improve decentering precision and the reliability of adhesion with a simple constitution, and simultaneously, to prevent the generation of dust inside a cartridge by providing a disk surface with the circular ring-shaped recessed part in which the hub of metallic integrated structure is fitted. CONSTITUTION:The surface of the disk substrate 1 of plastic material is provided with the circular ring-shaped recessed part to form a level difference part 8, and the flange part of the hub 5 of the metallic integrated structure is fitted in the level difference part 8, and the decentering precision and the reliability of the adhesion are enhanced through the simple constitution. Besides, the flange part of the hub 5 is not protruded above the surface of the substrate 1, and the generation of the dust due to abutting the cartridge of the plastic material with the flange part in the inner part of the cartridge is prevented, and long period stability is secured. |
