Spacer and hard disk drive apparatus
US-10872635-B2 · Dec 22, 2020 · US
Glass spacer, hard disk drive apparatus, and method for manufacturing glass spacer
US11682425B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11682425-B2 |
| Application number | US-202117315109-A |
| Country | US |
| Kind code | B2 |
| Filing date | May 7, 2021 |
| Priority date | Feb 1, 2018 |
| Publication date | Jun 20, 2023 |
| Grant date | Jun 20, 2023 |
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- Title
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- Abstract
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- First independent claim
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Abstract
Official abstract text for this publication.
A ring-shaped glass spacer is configured to be arranged in contact with a magnetic disk in a hard disk drive apparatus. A surface resistivity of a surface of a glass material of the glass spacer at 22 (° C.) is lower than a surface resistivity of an inner portion of the glass material at 22 (° C.).
First claim
Opening claim text (preview).
What is claimed is: 1. A ring-shaped glass spacer to be arranged in contact with a magnetic disk in a hard disk drive apparatus, wherein a surface resistivity of a surface of a glass material of the glass spacer at 22 (° C.) is lower than a surface resistivity of an inner portion of the glass material at 22 (° C.). 2. The glass spacer according to claim 1 , wherein a surface roughness Rz of an outer circumferential edge surface of the glass spacer that does not come into contact with the magnetic disk is at least 1.5 μm. 3. The glass spacer according to claim 1 , wherein grooves that extend along an outer circumference of the glass spacer are formed in an outer circumferential edge surface of the glass spacer that does not come into contact with the magnetic disk. 4. The glass spacer according to claim 2 , wherein grooves that extend along an outer circumference of the glass spacer are formed in the outer circumferential edge surface of the glass spacer that does not come into contact with the magnetic disk. 5. The glass spacer according to claim 1 , wherein a skewness of an outer circumferential edge surface of the glass spacer that does not come into contact with the magnetic disk is not larger than 1.2. 6. The glass spacer according to claim 2 , wherein a skewness of the outer circumferential edge surface of the glass spacer that does not come into contact with the magnetic disk is not larger than 1.2. 7. The glass spacer according to claim 3 , wherein a skewness of the outer circumferential edge surface of the glass spacer that does not come into contact with the magnetic disk is not larger than 1.2. 8. The glass spacer according to claim 4 , wherein a skewness of the outer circumferential edge surface of the glass spacer that does not come into contact with the magnetic disk is not larger than 1.2. 9. The glass spacer according to claim 1 , wherein the glass spacer contains at least one oxide selected from the group consisting of TiO 2 , Nb 2 O 5 , WO 3 , and Bi 2 O 3 , as a glass component. 10. A hard disk drive apparatus comprising the glass spacer according to claim 1 and the magnetic disk. 11. A hard disk drive apparatus comprising the glass spacer according to claim 2 and the magnetic disk. 12. A hard disk drive apparatus comprising the glass spacer according to claim 3 and the magnetic disk. 13. A hard disk drive apparatus comprising the glass spacer according to claim 4 and the magnetic disk. 14. A hard disk drive apparatus comprising the glass spacer according to claim 5 and the magnetic disk. 15. A hard disk drive apparatus comprising the glass spacer according to claim 6 and the magnetic disk. 16. A hard disk drive apparatus comprising the glass spacer according to claim 7 and the magnetic disk. 17. A hard disk drive apparatus comprising the glass spacer according to claim 8 and the magnetic disk. 18. A method for manufacturing a ring-shaped glass spacer to be arranged in contact with a magnetic disk in a hard disk drive apparatus, the method comprising: manufacturing a glass spacer blank that is a blank for the glass spacer; and reducing a surface resistivity of a surface of the glass spacer blank by performing reduction treatment on the surface. 19. The method for manufacturing a ring-shaped glass spacer according to claim 18 , wherein the glass spacer contains at least one oxide selected from the group consisting of TiO 2 , Nb 2 O 5 , WO 3 , and Bi 2 O 3 , as a glass component. 20. The method for manufacturing a ring-shaped glass spacer according to claim 18 , wherein a glass material of the glass spacer has a surface resistivity of 10 3 to 10 9 (Ω/sq) at 22 (° C.).
Assignees
Inventors
Classifications
the apparatus comprising a plurality of recording/reproducing devices, e.g. modular arrangements, arrays of disc drives · CPC title
- G11B17/021Primary
Selecting or spacing of record carriers for introducing the heads · CPC title
Glass or ceramic substrates · CPC title
Electro-Magnetic Interference [EMI] or Radio Frequency Interference [RFI] shielding; grounding of static charges · CPC title
Centering or locking of a plurality of discs in a single cartridge · CPC title
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Frequently asked questions
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- What does patent US11682425B2 cover?
- A ring-shaped glass spacer is configured to be arranged in contact with a magnetic disk in a hard disk drive apparatus. A surface resistivity of a surface of a glass material of the glass spacer at 22 (° C.) is lower than a surface resistivity of an inner portion of the glass material at 22 (° C.).
- Who is the assignee on this patent?
- Hoya Corp
- What technology area does this patent fall under?
- Primary CPC classification G11B17/021. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Jun 20 2023 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).