| 摘要 |
PROBLEM TO BE SOLVED: To obtain a sufficient cleaning effect on both of the inner peripheral part side and outer peripheral part side of a disk by setting the height of a rib for pressing a cleaning sheet to the disk lower on the outer peripheral part side than on the inner peripheral part side. SOLUTION: The rib 11 is so formed that the height in its inner peripheral part side, defined as h1, and the height on its outer peripheral part side, fined as h2, attain h1>h2, i.e., the inner peripheral part side is higher. The inner peripheral part side of the cartridge case is liable to bulge but the cleaning sheet is surely brought into contact with the disk and eventually the cleaning effect may be enhanced by making the height on the inner peripheral part side of the rib 11 higher than the height on the outer peripheral part side. In addition, a linear speed is higher in the outer peripheral part than in the inner peripheral part but the height of the rib 11 is so set as to be higher on the inner peripheral part side and, therefore, the air resistance of the rib 11 is made nearly equal on the inner peripheral part side and the outer peripheral part side and the rotation of the disk is stabilized.
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