Patent ID: 9003434
Filing Date: 2015-04-07
Classification: G11B

Abstract:
1. A spindle structure comprising: a spindle motor comprising a rotation axis; a spindle that is coupled to the spindle motor and which is configured to have an optical disc mounted thereon; a sliding cone coupled to the spindle and configured to be inserted into a center hole of the optical disc, the sliding cone comprising a compression spring between the sliding cone and the spindle such that the sliding cone is elastically biased; a clamper configured to fasten the optical disc to the spindle, the clamper comprising a projected rotation supporting portion protruding from a top center thereof and a cylindrical coupling protruding around a bottom center thereof; and a chucking spring comprising a flat plate-shape on a top surface thereof and comprising a pressing portion protruding from a bottom surface thereof and configured to press a top surface of the projected rotation supporting portion of the clamper, wherein the sliding cone and clamper are elastically biased by the chucking spring which pushes the clamper towards the optical disc and which also pushes the projected rotation supporting portion of the clamper which forces the cylindrical coupling protruding from the bottom of the clamper to be held in an inner portion of the sliding cone, causing a predetermined amount of pressure to secure the optical disc to the sliding cone during operation without the use of magnets.