Magnetic tape
US-2017372739-A1 · Dec 28, 2017 · US
Magnetic recording medium
US9767835B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9767835-B2 |
| Application number | US-201615054887-A |
| Country | US |
| Kind code | B2 |
| Filing date | Feb 26, 2016 |
| Priority date | Aug 17, 2010 |
| Publication date | Sep 19, 2017 |
| Grant date | Sep 19, 2017 |
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- Title
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Abstract
Official abstract text for this publication.
A magnetic recording medium of the present invention is a magnetic recording medium including a non-magnetic substrate; a non-magnetic layer that is formed on one of principal surfaces of the non-magnetic substrate and contains a non-magnetic powder, a binder, and a lubricant; and a magnetic layer that is formed on a principal surface of the non-magnetic layer opposite to the non-magnetic substrate and contains a magnetic powder and a binder. The magnetic powder has an average particle size between 10 nm and 35 nm inclusive. The lubricant is migratable to the magnetic layer and forms a lubricant layer on a surface of the magnetic layer when a pressure is applied to the magnetic layer. When spacing of the surface of the magnetic layer before and after washing the lubricant with n-hexane is measured with a TSA (Tape Spacing Analyzer), the value of the spacing after washing is 3 to 10 nm, and the value of the spacing before washing is 1 to 5 nm smaller than the value of the spacing after washing.
First claim
Opening claim text (preview).
What is claimed is: 1. A magnetic recording medium comprising a non-magnetic substrate; a non-magnetic layer that is formed on one of principal surfaces of the non-magnetic substrate and contains a non-magnetic powder, a binder, and a lubricant; and a magnetic layer that is formed on a principal surface of the non-magnetic layer opposite to the non-magnetic substrate and contains a magnetic powder and a binder, wherein the magnetic powder is either a platy hexagonal ferrite magnetic powder or a spherical iron nitride magnetic powder, the magnetic layer has a thickness of 10 to 150 nm, the magnetic layer has a surface roughness of 1 nm or more and less than 2 nm, and when spacing of the surface of the magnetic layer before and after washing the magnetic recording medium with n-hexane is measured with a TSA (Tape Spacing Analyzer) while pressurizing the surface of the magnetic recording medium under a pressing pressure of 0.5 atm, the value of the spacing before washing is 1 to 5 nm smaller than the value of the spacing after washing, and the value of the spacing after washing is between 5 nm and 10 nm. 2. The magnetic recording medium according to claim 1 , wherein the magnetic powder has an average particle size between 15 nm and 35 nm.
Assignees
Inventors
Classifications
characterised by the dimension of the magnetic particles · CPC title
containing Fe metal or alloys (G11B5/70621 takes precedence) · CPC title
Physics · mapped topic
- G11B5/71Primary
characterised by the lubricant · CPC title
containing non-metallic substances · CPC title
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Frequently asked questions
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- What does patent US9767835B2 cover?
- A magnetic recording medium of the present invention is a magnetic recording medium including a non-magnetic substrate; a non-magnetic layer that is formed on one of principal surfaces of the non-magnetic substrate and contains a non-magnetic powder, a binder, and a lubricant; and a magnetic layer that is formed on a principal surface of the non-magnetic layer opposite to the non-magnetic subst…
- Who is the assignee on this patent?
- Hitachi Maxell
- What technology area does this patent fall under?
- Primary CPC classification G11B5/71. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Sep 19 2017 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).