Patent ID: 6650610
Filing Date: 2003-11-18
Classification: G11B

Abstract:
A disk device comprising:a) a main body having a base member; b) a disk tray loadable into said main body for placement of a disk having a central portion; c) a chucking member having an axis of rotation and provided on said disk tray for holding said disk in place at its central portion; and d) a drive motor provided on said base member for rotational engagement with said chucking member, e) wherein said base member is rotatably supported inside said main body for movement of said drive motor toward said disk tray and away from said disk tray during advancement and retraction of said disk tray with respect to said main body; f) wherein said chucking member is constructed so as to be exposed outside of said main body along with the advancement and retraction of said disk tray with respect to said main body; g) wherein said drive motor further comprises a motor main unit having an axis of rotation, a rotation shaft and a rotating plate, wherein said drive motor is coupled to said motor main unit and to said rotation shaft and said rotating plate that makes tight contact with said chucking member, and when said disk tray is accommodated in said main body said chucking member makes tight contact with said rotating plate by magnetic force and rotates synchronously with the rotation of said motor main unit; h) wherein said rotating plate further comprises a spherical surface having a vertex at a position corresponding to the axis of rotation of said motor main unit, and said chucking member further comprises a base surface that makes tight contact with said rotating plate, said base surface being in the shape of a concave curved surface corresponding to said rotating plate, and the lowest part of said base surface corresponding to the axis of rotation of said chucking member; and i) further comprising a protrusion provided on said rotating plate and adapted for engagement with a depression provided in said base surface of said chucking member.