Disk driving apparatus for reliably centering a meter-layer optical disk on which information is recorded

A disk driving apparatus comprising:

• a motor for rotating a rotational shaft;
• a turntable mounted on the rotational shaft of said motor, said turntable used for mounting and driving into rotation a multi-disk set comprising a plurality of disk plates stuck to each other;
• and
• a disk centering mechanism comprising;
• a fixed member with upper and lower side surfaces separated by a step portion, said step portion being disposed so as to be in a center hole of said multi-disk set when said multi-disk set is mounted on said turntable such that only said lower side surface of said fixed member contacts said multi-disk set when mounted on said turntable, and
• a flexible member for contacting and supporting said multi-disk set, said flexible member bending in a radial direction of said turntable when said multi-disk set is mounted on said turntable,
• wherein said fixed member further comprises an upper sloped surface above said upper side surface, wherein said upper sloped surface is tapered outward with respect to said rotational shaft in a downward direction.

A disk driving apparatus comprising:

• a turntable for mounting and rotating a multi-disk set comprising a plurality of disk plates stuck to each other;
• and
• a disk centering mechanism comprising;
• a fixed member, and
• a flexible member, aligned opposite said fixed member, for contacting and supporting said multi-disk set, said flexible member bending in a radial direction of said turntable when said multi-disk set is mounted on said turntable,
• wherein said fixed member comprises upper and lower side surfaces separated by a step portion, said step portion being disposed so as to be in a center hole of said multi-disk set when said multi-disk set is mounted on said turntable such that only said lower side surface of said fixed member contacts said multi-disk set when mounted on said turntable,
• wherein said fixed member further comprises an upper sloped surface above said upper side surface, wherein said upper sloped surface is tapered outward with respect to said rotational shaft in a downward direction.