CHUCKING MECHANISM, BRUSHLESS MOTOR HAVING THE CHUCKING MECHANISM, AND DISK DRIVING APPARATUS HAVING THE BRUSHLESS MOTOR
First Claim
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.
1 Assignment
0 Petitions
Accused Products
Abstract
A claw member includes at a radially inward surface thereof a protrusion inclined surface in order to minimize deformation occurring in an axial direction to an elastic member which is a coil spring. The protrusion inclined surface is preferably inclined, when a tip portion of the claw member is at an axially lowest point, to be substantially perpendicular to the central axis, or such that the further radially inward a portion thereof is the axially lower the portion is. By virtue of such configuration, the protrusion inclined surface minimizes deformation occurring to the elastic member in the axial direction.
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Citations
17 Claims
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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:
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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, wherein a 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 14, 15, 16, 17)
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9. A chucking mechanism operable to detachably set thereon a discoid disk including a central opening portion, the chucking mechanism comprising:
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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, wherein a 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, the claw member includes at a radially inner surface thereof below the protrusion in the axial direction an inner circumferential inclined surface inclined such that the further radially outward a portion thereof the axially lower the portion is, and the inner circumferential inclined surface is substantially parallel with the central axis when the tip portion is at an axially lowest point. - View Dependent Claims (10, 11, 12)
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13. A chucking mechanism operable to detachably set thereon a discoid disk including a central opening portion, the chucking mechanism comprising:
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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, wherein a 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 is 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 step portion inclined such that the further radially inward a portion thereof is the axially lower the portion is indented, and arranged so as not the 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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Specification