| 摘要 |
PURPOSE:To prevent an OFF-track by forming a large diameter hole part to prevent a driving pin from abutting, at the end part of a joining surface side of the driving pin bearing hole of one pair of the upper and the lower hub constituting bodies. CONSTITUTION:A disk sheet 12, one which the upper and the lower hub constituting bodies 15, 16 of one pair are attached, is stored in a shell 19, and the disk sheet is rotated by fitting a center pin bearing hole 13 and the drive pin bearing hole 14 together with respectively the center pin 21 and the driving pin 22 of the driving shaft 20. At the end part of the joining surface side of the driving pin bearing hole 14, the large diameter hole part 23 is provided, and the hole part 23 is formed in such the diameter as a height h1 in a state for which the driving pin 22 is inserted in the driving pin bearing hole 14 and the disk cassette 11 is set at a driving side, comes a little higher than the height h2 of the driving pin 22, and further, the some misalignment of the driving pin bearing hole 14 can be eliminated.
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