Glass spacer and hard disk drive device

Patent metadata

Field	Value
Publication number	US-12183365-B2
Application number	US-202318494381-A
Country	US
Kind code	B2
Filing date	Oct 25, 2023
Priority date	Mar 6, 2020
Publication date	Dec 31, 2024
Grant date	Dec 31, 2024

Abstract

A ring-shaped glass spacer is to be arranged in contact with a magnetic disk in a hard disk drive device. A film that contains at least one of tin oxide, zinc oxide, and titanium oxide is formed on each surface of a main surface, and an outer circumferential edge surface, and an inner circumferential edge surface of the glass spacer. The thickness of the film on a center portion of the outer circumferential edge surface of the glass spacer is larger than the thickness of the film on a center portion of the inner circumferential edge surface of the glass spacer.

First claim

What is claimed is:

1. A ring-shaped glass spacer to be arranged in contact with a magnetic disk in a hard disk drive device,
wherein a film that contains at least one of tin oxide, zinc oxide, and titanium oxide is formed on each surface of a main surface, and an outer circumferential edge surface, and an inner circumferential edge surface of the glass spacer, and
the thickness of the film on a center portion of the outer circumferential edge surface of the glass spacer is larger than the thickness of the film on a center portion of the inner circumferential edge surface of the glass spacer.

2. The glass spacer according to claim 1 ,
the thickness of the film on the center portion of the outer circumferential edge surface or the center portion of the inner circumferential edge surface of the glass spacer is larger than the thickness of the film on a center portion of the main surface of the glass spacer.

3. The glass spacer according to claim 1 ,
wherein the difference between the largest film thickness and the smallest film thickness of the films on the center portion of the main surface, and the center portion of the outer circumferential edge surface, and the center portion of the inner circumferential edge surface of the glass spacer is less than half of the largest film thickness.

4. The glass spacer according to claim 1 ,
wherein the thickness of the film formed on the center portion of each of the main surface, and the outer circumferential edge surface, and the inner circumferential edge surface of the glass spacer is less than 100 nm.

5. The glass spacer according to claim 1 ,
wherein the arithmetic average roughness Ra of the outer circumferential edge surface or the inner circumferential edge surface of the glass spacer is larger than the arithmetic average roughness Ra of the main surface of the glass spacer.

6. The glass spacer according to claim 1 ,
wherein the surface resistivity of the film at 22 [C] ranges from 10-4 to 10 6 [Ω/sq].

7. A hard disk drive device comprising:
the glass spacer according to claim 1 ; and
the magnetic disk.

8. A ring-shaped glass spacer to be arranged in contact with a magnetic disk in a hard disk drive device,
wherein a film that contains at least one of tin oxide, zinc oxide, and titanium oxide is formed on each surface of a main surface, and an outer circumferential edge surface, and an inner circumferential edge surface of the glass spacer, and
the thickness of the film on a center portion of the outer circumferential edge surface or a center portion of the inner circumferential edge surface of the glass spacer is larger than the thickness of the film on a center portion of the main surface of the glass spacer.

9. The glass spacer according to claim 8 ,
wherein the difference between the largest film thickness and the smallest film thickness of the films on the center portion of the main surface, and the center portion of the outer circumferential edge surface, and the center portion of the inner circumferential edge surface of the glass spacer is less than half of the largest film thickness.

10. The glass spacer according to claim 8 ,
wherein the thickness of the film formed on the center portion of each of the main surface, and the outer circumferential edge surface, and the inner circumferential edge surface of the glass spacer is less than 100 nm.

11. The glass spacer according to claim 8 ,
wherein the arithmetic average roughness Ra of the outer circumferential edge surface or the inner circumferential edge surface of the glass spacer is larger than the arithmetic average roughness Ra of the main surface of the glass spacer.

12. The glass spacer according to claim 8 ,
wherein the surface resistivity of the film at 22 [C] ranges from 10-4 to 10 6 [Ω/sq].

13. A hard disk drive device comprising:
the glass spacer according to claim 8 ; and
the magnetic disk.

Assignees

• Hoya Corp

Inventors

• Miura Masafumi
• Hashimoto Kazuaki
• Higuchi Naoyuki

Classifications

• G11B23/03 Primary

  Containers for flat record carriers · CPC title

• G11B5/73921

  Glass or ceramic substrates · CPC title

• G11B19/2009

  Turntables, hubs and motors for disk drives; Mounting of motors in the drive (means for clamping of disk to turntable G11B17/022 and subgroups) · CPC title

• G11B17/021 Primary

  Selecting or spacing of record carriers for introducing the heads · CPC title

• G11B23/00

  Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus {; Intermediate mediums; Apparatus or processes specially adapted for their manufacture (processes involving a single technical art and for which provision exists elsewhere, see the relevant class, e.g. B29, B41M, B05D, C08L, F16N)} · CPC title