Patent ID: 6570836
Filing Date: 2003-05-27
Classification: G11B

Abstract:
A disk clamping mechanism, comprising:a turntable being formed into a circular disk, said turntable having a columnar section, which is coaxially provided to a center of an upper face of said turntable and which is capable of fitting into a center hole of a disk-shaped medium mounted on said turntable so as to coincide an axial line of the disk-shaped medium with an axial line of said turntable, and a circular supporting section, which is capable of supporting a bottom face of the disk-shaped medium and which is formed in the upper face and along an outer edge of said turntable; a clamper being formed into a circular disk, said clamper having a circular pressing section, which is formed in a bottom face and along an outer edge of said clamper, said clamper being magnetically drawn toward the upper face of said turntable so as to hold the disk-shaped medium between the supporting section of said turntable and the pressing section of said clamper; a circular hole being formed at a center of an upper end face of the columnar section of said turntable; and a positioning boss being formed into a columnar shape and provided to a center of the bottom face of said clamper, said positioning boss being inserted into said circular hole so as to coincide an axial line of said clamper with the axial line of said turntable, wherein an outer circumferential face of said positioning boss is formed into a tapered face whose outer diameter is gradually made greater toward a base end thereof and a maximum outer diameter of the tapered face is greater than an inner diameter of said circular hole, and the tapered face of said positioning boss contacts an inner edge of said circular hole when said clamper is magnetically held on said turntable on which no disk-shaped shaped medium is mounted, and the insertion of said positioning boss into said circular hole is stopped before said positioning boss is completely inserted into said circular hole.