Disk clamping mechanism for a disk player
AssigneePioneer Electronic Corporation
InventorsTadashi Funabashi, Kenji Tanaka
Life of this patent
Estimating the term…
Abstract
A disk clamping mechanism for a disk player in which centering of a supporting member on a pressing member which performs a pressing operation in cooperation with a turntable is performed accurately and inexpensively. A spherical bearing member is placed in a tapered portion which is at the center of the pressing member, and contacts a bearing reception member on a lower surface of a lift member which lifts the pressing member off a disk when the disk is not being played. The pressing member is balanced on a turntable by means of a protrusion formed in a lower surface of the pressing member at its rotational center, the protrusion fitting into a corresponding recess in the rotational center of the turntable.
Claims8
In a disk-driving mechanism including a turntable for rotating a disk to be played, a clamping mechanism comprising:
- a pressing member, for clamping said disk in cooperation with said turntable, and having a projection extending from a lower surface thereof at its rotational center, said turntable having a recess formed in an upper surface thereof, at its respective rotational center, said projection fitting into said recess, said pressing member further having an outer annular pressing protrusion, extending from the side of said pressing member facing said disk, for pressing a main surface of said disk, and an inner annular pressing protrusion, extending in the same direction as said outer annular pressing protrusion;
- a spherical bearing member which contacts the rotational center of said pressing member on an upper surface thereof;
- an annular holding member fitted around said spherical bearing member, an upper end portion of said spherical bearing member projecting out of said holding member so as to fix said spherical bearing member onto said pressing member;
- supporting means for rotatably supporting said pressing member, said supporting means having a surface which faces the upper surface of said pressing member and which contacts said upper end portion of said spherical bearing member, said pressing member having a tapered portion formed at a contact point between said spherical bearing member and said pressing member, said tapered portion conforming to the surface of said spherical bearing member;
- a spindle passing through the rotational center of said turntable;
- and
- a centering hub having a rotational center through which said spindle also passes, said centering hub accommodating at least one of a first disk having a center hole of a first diameter and a second disk having a center hold of a second diameter smaller than said first diameter, wherein said outer annular pressing protrusion clamps said first disk and said inner annular pressing protrusion clamps said second disk.
Dependencies are inferred from the claim text.