Disk device and head stack assembly

Patent metadata

Field	Value
Publication number	US-2024221781-A1
Application number	US-202318446944-A
Country	US
Kind code	A1
Filing date	Aug 9, 2023
Priority date	Jan 4, 2023
Publication date	Jul 4, 2024
Grant date	—

Abstract

According to one embodiment, a disk device includes an arm with a through hole, a base plate, a load beam, and a damper. The arm has a first surface and a second surface opposite the first surface. The base plate has a first protrusion in the through hole. The load beam is attached to the base plate and has a fourth surface and a fifth surface opposite the fourth surface. The first surface and the fourth surface faces one magnetic disk. The fifth surface is inclined so as to be closer to the one magnetic disk as is further away from the arm. The damper is attached to the fifth surface. A value obtained by dividing a first distance between the first surface and the second surface by a second distance between an end of the damper and an axis of the through hole is 0.11 or less.

First claim

What is claimed is:

1 . A disk device comprising:
11 or more magnetic disks; an arm with a through hole configured to rotate around a rotation axis, and having:
a first surface spaced from the rotation axis in a first direction orthogonal to the rotation axis, to face one magnetic disk among the 11 or more magnetic disks, and
a second surface being opposite the first surface, the through hole being open to the first surface and the second surface;
a base plate having:
a third surface facing the first surface, and
a first protrusion protruding from the third surface to fit in the through hole;
a load beam attached to the base plate and having:
a fourth surface facing the one magnetic disk, and
a fifth surface being opposite the fourth surface and inclined with respect to the first surface so as to be closer to the one magnetic disk as is further away from the arm; and
a damper attached to the fifth surface, wherein a value obtained by dividing a first distance between the first surface and the second surface by a second distance between an end of the damper and an axis of the through hole is 0.11 or less, the end of the damper being in a second direction opposite to the first direction.

2 . The disk device according to claim 1 , wherein
the second distance is set to 4.5 mm or more.

3 . The disk device according to claim 1 , wherein
the first distance is set to 0.5 mm or less.

4 . The disk device according to claim 1 , further comprising:
a flexure attached to the fourth surface; and a magnetic head mounted on the flexure and configured to read and write information from and to the one magnetic disk, wherein the load beam includes a second protrusion that protrudes from the fourth surface and supports the magnetic head, and a value obtained by dividing a third distance between a tip of the second protrusion farthest away from the fourth surface and an end of the base plate in the first direction by a fourth distance between the tip of the second protrusion and an end of the load beam in the first direction is 2.8 or more.

5 . The disk device according to claim 1 , further comprising:
a flexure attached to the fourth surface; and a magnetic head mounted on the flexure and configured to read and write information from and to the one magnetic disk, wherein the load beam includes a second protrusion that protrudes from the fourth surface and supports the magnetic head, and a value obtained by dividing a fifth distance between a tip of the second protrusion farthest away from the fourth surface and the axis of the through hole by a sixth distance between an end of the base plate in the first direction and the axis of the through hole is 2.5 or more.

6 . The disk device according to claim 1 , wherein the damper includes:
a first damper attached to the fifth surface, and a second damper being different from the first damper and attached to the first damper away from the load beam.

7 . The disk device according to claim 1 , wherein
the damper has a thickness of 7 mil or more in a direction orthogonal to the fifth surface, and a value obtained by dividing the first distance by the second distance is smaller than 0.1.

8 . The disk device according to claim 1 , wherein
the damper has a thickness of 8 mil or more in a direction orthogonal to the fifth surface, and a value obtained by dividing the first distance by the second distance is smaller than 0.09.

9 . A head stack assembly comprising:
an arm with a through hole configured to rotate around a rotation axis, and having:
a first surface spaced from the rotation axis in a first direction orthogonal to the rotation axis, and
a second surface opposite the first surface, the through hole being open to the first surface and the second surface;
a base plate having:
a third surface facing the first surface, and
a first protrusion protruding from the third surface to fit in the through hole;
a load beam attached to the base plate and extending from the base plate in a direction between the first direction and a direction which the first surface faces, and having:
a fourth surface facing a direction between the direction which the first surface faces and a second direction opposite to the first direction, and
a fifth surface opposite to the fourth surface and facing a direction between the first direction and a direction which the second surface faces; and
a damper attached to the fifth surface, wherein a value obtained by dividing a first distance between the first surface and the second surface by a second distance between an end of the damper and an axis of the through hole is 0.11 or less, the end of the damper being in the second direction.

Assignees

• Toshiba Kk
• Toshiba Electronic Devices & Storage Corp

Inventors

• Kimura Ryusuke
• Nojima Yusuke
• Sasaki Yasutaka

Classifications

• G11B21/21

  with provision for maintaining desired spacing of head from record carrier, e.g. fluid-dynamic spacing, slider · CPC title

• G11B5/5578

  Multiple actuators addressing the same disk, e.g. to improve data rate or access rate · CPC title

• G11B5/4886

  relative to rotating disc · CPC title

• G11B5/4833 Primary

  Structure of the arm assembly, e.g. load beams, flexures, parts of the arm adapted for controlling vertical force on the head (G11B5/484 takes precedence) · CPC title

• G11B5/4813 Primary

  Mounting or aligning of arm assemblies, e.g. actuator arm supported by bearings, multiple arm assemblies, arm stacks or multiple heads on single arm (G11B5/484 takes precedence) · CPC title