Glass substrate for magnetic disk and magnetic disk
US-2015371673-A1 · Dec 24, 2015 · US
Glass substrate for a magnetic disk, magnetic disk and method of manufacturing a magnetic disk
US9105293B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9105293-B2 |
| Application number | US-201314094960-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 3, 2013 |
| Priority date | Dec 28, 2007 |
| Publication date | Aug 11, 2015 |
| Grant date | Aug 11, 2015 |
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Abstract
Official abstract text for this publication.
A glass substrate for a magnetic disk, wherein, in regions with respect to two places arbitrarily selected on a surface of the glass substrate on its central portion side relative to its outer peripheral end, a surface shape with a shape wavelength in a band of 60 to 500 μm is extracted from surface shapes in each of the regions and, assuming that a root mean square roughness Rq of the surface shape is given as a microwaviness Rq, the difference between the microwavinesses Rq of the regions is 0.02 nm or less or the difference between standard deviations of the microwavinesses Rq of the regions is 0.04 nm or less.
First claim
Opening claim text (preview).
The invention claimed is: 1. A glass substrate for a magnetic disk, wherein, in regions with respect to two places arbitrarily selected on a surface of the glass substrate on a central portion side relative to an outer peripheral end, a surface shape with a shape wavelength in a band of 60 to 500 μm is extracted from surface shapes in each of the regions and, assuming that a root mean square of the surface shape is given as a microwaviness (MW-Rq), a difference between the microwav…
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Physics · mapped topic
- G11B5/7315Primary
Physics · mapped topic
- G11B5/73921Primary
Physics · mapped topic
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- What does patent US9105293B2 cover?
- A glass substrate for a magnetic disk, wherein, in regions with respect to two places arbitrarily selected on a surface of the glass substrate on its central portion side relative to its outer peripheral end, a surface shape with a shape wavelength in a band of 60 to 500 μm is extracted from surface shapes in each of the regions and, assuming that a root mean square roughness Rq of the surface …
- Who is the assignee on this patent?
- Hoya Corp
- What technology area does this patent fall under?
- Primary CPC classification G11B5/7315. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Aug 11 2015 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).