Disk apparatus having an improved clamp structure
View Patent ↗A magnetic disk apparatus can achieve reduced thickness by reducing thickness of the clamp, improved shock resistance achieved by an increase of clamping force, and reduced rotating synchronous deviation due to such as camber or undulation of a disk generated by eccentricity of the disk depressing section, a disk receiving surface of the spindle hub and the disk. That is, on a circumference more inwards than a portion in contact with an outside diameter of screw head section and clamp, clamp has displacement section in a screw axial direction throughout the whole circumference with a contact section set as a reference.
1. A disk apparatus comprising:
a disk which stores information;
a clamp which has a central hole;
a spindle hub which is equipped with the disk, has a boss that fits into the clamp and allows a rotating center axis of the spindle hub to coincide with a center axis of the clamp;
a screw which has a thread section and a head section, said thread section passing the central hole of the clamp and being tightened to the spindle hub, and said head section coming in contact with the clamp and providing the clamp with an axial force generated when the thread section is tightened to the spindle hub, to fix the disk to the spindle hub; and
a spindle motor which rotates the spindle hub,
wherein the clamp is displaced in a direction of the axial force at a first portion thereof positioned radially inwardly of a contact region where the clamp and the head section are held in contact with each other.
2. The disk apparatus according to claim 1 , wherein the clamp is further displaced in a direction opposite to the direction of the axial force at a second portion thereof positioned radially inwardly of the first portion.
3. A disk apparatus comprising:
a disk which stores information;
a clamp which has a central hole;
a spindle hub which is equipped with the disk, has a boss that fits into the clamp and allows a rotating center shaft of the spindle hub to coincide with a center shaft of the clamp;
a screw which has a thread section and a head section, said thread section passing the central hole of the clamp and being tightened to the spindle hub, and said head section coming in contact with the clamp and providing the clamp with an axial force generated when the thread section is tightened to the spindle hub, to fix the disk to the spindle hub; and
a spindle motor which rotates the spindle hub,
wherein the clamp on a circumference more radially inward than a contact section between the clamp and the head section, and has a plurality of protrusions in a direction of the axial force.
4. The disk apparatus according to claim 3 , wherein the spindle hub fits in an inner circumferential side surface of the plurality of protrusions of the clamp and allows a rotating center axis of the spindle hub to coincide with a center axis of the clamp.
5. A disk apparatus comprising:
a disk which stores information;
a clamp which has a central hole;
a spindle hub which is equipped with the disk, has a boss that fits into the clamp and allows a rotating center axis of the spindle hub to coincide with a center axis of the clamp;
a screw which has a thread section and a head section, said thread section passing the central hole of the clamp and being tightened to the spindle hub, and said head section coming in contact with the clamp and providing the clamp with an axial force generated when the thread section is tightened to the spindle hub, to fix the disk to the spindle hub; and
a spindle motor which rotates the spindle hub,
wherein the clamp on a circumference more radially inward than a contact section between the clamp and the head section, has a plurality of protrusions in a direction opposite to a direction of the axial force.
6. The disk apparatus according to claim 5 , wherein the spindle hub is equipped with a boss which fits in an inner circumferential side surface where no plurality of protrusions of clamp exist and allows the rotating center axis of the spindle hub to coincide with the center axis of the clamp.