| 摘要 |
PROBLEM TO BE SOLVED: To straighten an optical disk by deforming without forming a taper on the lower face of a turntable in the optical disk drive. SOLUTION: When housed in a disk tray 16, an optical disk 14 is moved vertically by a clamper 26, and pressed and fixed to the lower face of the turntable 24 disposed above the disk. An annular protrusion whereon the outer edge of a 12 cm optical disk is abutted and an annular protrusion whereon the outer edge of an 8 cm optical disk is abutted are formed on the lower face of the turntable 24, and further grooves are formed on the annular protrusion at specified positions as vents. The cross-sectional shape of the optical disk 14 is straightened to a bevel state by the annular protrusions when the optical disk 14 is pressed and fixed, and the optical disk 14 after the driving is easily detached by the groove. COPYRIGHT: (C)2005,JPO&NCIPI
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