Hard disk drive including annular spacer with inclined region on main surface

Patent metadata

Field	Value
Publication number	US-12394439-B2
Application number	US-202418754466-A
Country	US
Kind code	B2
Filing date	Jun 26, 2024
Priority date	Sep 30, 2020
Publication date	Aug 19, 2025
Grant date	Aug 19, 2025

Abstract

A hard disk drive includes a magnetic disk, and an annular spacer. The annular space includes two main surfaces, an inner circumferential surface, an outer circumferential surface, and a chamfered surface present between the outer circumferential surface and each of the two main surfaces. The annular spacer is disposed such that one of the two main surfaces is in contact with the magnetic disk. At least one main surface of the two main surfaces includes an inclined region, and the inclined region is inclined in an outer circumferential region of the at least one main surface toward a boundary between the at least one main surface and the chamfered surface such that a surface height of the spacer gradually decreases toward the boundary. The magnetic disk has a thickness of 0.55 mm or less. A material of a substrate for the magnetic disk includes aluminum alloy.

First claim

What is claimed is:

1. A hard disk drive comprising:
a magnetic disk; and
an annular spacer including
two main surfaces,
an inner circumferential surface,
an outer circumferential surface, and
a chamfered surface present between the outer circumferential surface and each of the two main surfaces,

the annular spacer being disposed such that one of the two main surfaces is in contact with the magnetic disk, wherein
at least one main surface of the two main surfaces includes an inclined region, and the inclined region is inclined in an outer circumferential region of the at least one main surface toward a boundary between the at least one main surface and the chamfered surface such that a surface height of the spacer gradually decreases toward the boundary,
the magnetic disk has a thickness of 0.55 mm or less, and
a material of a substrate for the magnetic disk includes aluminum alloy.

2. The hard disk drive according to claim 1 , wherein
a drop amount of the inclined region that is inclined toward the other main surface side of the spacer is 0.1 to 2 μm.

3. The hard disk drive according to claim 2 , wherein
a Young's modulus of a material of the spacer is smaller than a Young's modulus of the substrate that constitutes the magnetic disk.

4. The hard disk drive according to claim 3 , further comprising
ten or more magnetic disks.

5. The hard disk drive according to claim 3 , wherein
the spacer has a conductive film on a surface of the spacer.

6. The hard disk drive according to claim 5 , further comprising
ten or more magnetic disks.

7. The hard disk drive according to claim 2 , wherein
the spacer has a conductive film on a surface of the spacer.

8. The hard disk drive according to claim 7 , further comprising
ten or more magnetic disks.

9. The hard disk drive according to claim 2 , further comprising
ten or more magnetic disks.

10. The hard disk drive according to claim 1 , wherein
the inclined region of the spacer is a curved surface that protrudes in a direction from the inside to the outside of the spacer.

11. The hard disk drive according to claim 1 , wherein
a Young's modulus of a material of the spacer is smaller than a Young's modulus of the substrate that constitutes the magnetic disk.

12. The hard disk drive according to claim 11 further comprising
ten or more magnetic disks.

13. The hard disk drive according to claim 11 , wherein
the spacer has a conductive film on a surface of the spacer.

14. The hard disk drive according to claim 13 further comprising
ten or more magnetic disks.

15. The hard disk drive according to claim 1 , wherein
a material of the spacer includes aluminum or aluminum alloy.

16. The hard disk drive according to claim 15 , wherein
the spacer has a conductive film on a surface of the spacer.

17. The hard disk drive according to claim 16 , further comprising
ten or more magnetic disks.

18. The hard disk drive according to claim 1 , wherein
the spacer has a conductive film on a surface of the spacer.

19. The hard disk drive according to claim 18 , further comprising
ten or more magnetic disks.

20. The hard disk drive according to claim 1 , further comprising
ten or more magnetic disks.

Assignees

• Hoya Corp

Inventors

• Takano Masao

Classifications

• G11B25/043

  using rotating discs · CPC title

• G11B5/73

  Base layers {, i.e. all non-magnetic layers lying under a lowermost magnetic recording layer, e.g. including any non-magnetic layer in between a first magnetic recording layer and either an underlying substrate or a soft magnetic underlayer} · CPC title

• G11B23/03

  Containers for flat record carriers · CPC title

• G11B5/82

  Disk carriers · CPC title

• G11B17/038 Primary

  Centering or locking of a plurality of discs in a single cartridge · CPC title