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CHUCKING MECHANISM, BRUSHLESS MOTOR HAVING THE CHUCKING MECHANISM, AND DISK DRIVING APPARATUS HAVING THE BRUSHLESS MOTOR

  • US 20080046905A1
  • Filed: 08/20/2007
  • Published: 02/21/2008
  • Est. Priority Date: 08/21/2006
  • Status: Active Grant
First Claim
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1. A chucking mechanism operable to detachably set thereon a discoid disk including a central opening portion, the chucking mechanism comprising:

  • a center case arranged concentrically with a predetermined central axis, including a cylindrical portion which fits the central opening portion, a top plate covering an axially upper side of the cylindrical portion, and a plurality of openings arranged in a circumferential direction extending from the cylindrical portion to an outer circumferential side of the top plate portion;

    a claw member movable with respect to the opening, protruding in a radially outward direction from the cylindrical portion, and making contact with the central opening portion of the disk;

    a coil spring providing radial force to the claw member; and

    a turn table including a disk setting surface setting thereon the disk, whereina tip portion arranged at a radially outmost portion of the claw member continues to move in an axially downward direction and a radially inward direction until the disk is set on the disk setting surface,a protrusion which fits the coil spring is arranged at a surface of the claw member making contact with the coil spring, and the protrusion includes a protrusion inclined surface inclined such that the further radially inward a portion thereof is the axially lower the portion is, and arranged so as not to force the coil spring to be pressed in the axial direction when the tip portion moves in the axially downward direction.

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