Patent ID: 7219360
Filing Date: 2007-05-15
Classification: G11B

Abstract:
1. A disc chucking mechanism comprising: a central shaft which serves as a motor shaft of a spindle motor; a table section, which is fixed to the central shaft and on which an inner circumferential section of a disc-shaped recording medium is placed; a chucking pulley for sandwiching the internal circumference portion of the disc-shaped recording medium together with the table section; a centering protrusion, which is movably supported by the central shaft in the shaft direction and inserted into a central hole of the disc-shaped recording medium, for centering the disc-shaped recording medium; a forcing means for forcing the centering protrusion to a direction away from the table section in the shaft direction of the central shaft; and a separation-stop shaft having a separation-stop section, which is positioned in such a way that the separation-stop section is substantially parallel to the central shaft, for preventing the centering protrusion from being separated from the central shaft.