Spacer and hard disk drive device

Patent metadata

Field	Value
Publication number	US-2023368815-A1
Application number	US-202118029251-A
Country	US
Kind code	A1
Filing date	Sep 30, 2021
Priority date	Sep 30, 2020
Publication date	Nov 16, 2023
Grant date	—

Abstract

Provided is an annular spacer to be disposed such that a main surface of the spacer is in contact with a magnetic disk in a hard disk drive device, the spacer including two main surfaces; an inner circumferential surface; and an outer circumferential surface, in which a chamfered surface is present between the outer circumferential surface and each of the two main surfaces, and at least a portion of an outer circumferential region of at least one of the two main surfaces includes an inclined region that is inclined toward the other main surface side in a radial direction from a center of the spacer to the outer circumferential surface side.

First claim

1 . (canceled)

2 . The spacer according to claim 6 ,
wherein a drop amount of the inclined region that is inclined toward the other main surface side is 0.1 to 2 μm.

3 . The spacer according to claim 6 ,
wherein the inclined region is a curved surface that protrudes in a direction from the inside to the outside of the spacer.

4 . (canceled)

5 . The spacer according to claim 6 .
wherein the Young's modulus of the spacer is smaller than the Young's modulus of a substrate that constitutes the magnetic disk.

6 . An annular spacer to be disposed such that a main surface of the spacer is in contact with a magnetic disk in a hard disk drive device, the spacer comprising:
two main surfaces, an inner circumferential surface: and an outer circumferential surface. wherein a chamfered surface is present between the outer circumferential surface and each of the two main surfaces, at least a portion of an outer circumferential region of at least one of the two main surfaces includes an inclined region that is inclined toward the other main surface side in a radial direction from a center of the spacer to the outer circumferential surface side, and a material of the spacer contains glass,

7 . The spacer according to claim 6 . further comprising
a conductive film on a surface of the spacer.

8 . The spacer according to claim 6 .
wherein the magnetic disk has a thickness of 0.55 mm or less.

9 . A hard disk drive device comprising the spacer according to claim 6 .

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

11 . The hard disk drive device according to claim 9 ,
wherein a substrate for the magnetic disks is made of glass.

12 . The spacer according to claim 2 ,
wherein the inclined region is a curved surface that protrudes in a direction from the inside to the outside of the spacer.

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

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

15 . The spacer according to claim 12 ,
wherein the Young's modulus of the spacer is smaller than the Young's modulus of a substrate that constitutes the magnetic disk.

16 . The spacer according to claim 2 , further comprising
a conductive film on a surface of the spacer.

17 . The spacer according to claim 3 , further comprising
a conductive film on a surface of the spacer.

18 . The spacer according to claim 5 , further comprising
a conductive film on a surface of the spacer.

19 . The spacer according to claim 12 , further comprising
a conductive film on a surface of the spacer.

20 . The spacer according to claim 13 , further comprising
a conductive film on a surface of the spacer.

21 . The spacer according to claim 14 , further comprising
a conductive film on a surface of the spacer.

22 . The spacer according to claim 15 , further comprising
a conductive film on a surface of the spacer.

Assignees

• Hoya Corp

Inventors

• Takano Masao

Classifications

• G11B17/038 Primary

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

• G11B5/82

  Disk carriers · CPC title

• G11B23/03

  Containers for flat record carriers · 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

• G11B25/043

  using rotating discs · CPC title