Magnetic tape apparatus, magnetic tape, and magnetic tape cartridge
US-2024013807-A1 · Jan 11, 2024 · US
Magnetic tape and magnetic recording and reproducing device
US2020227084A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2020227084-A1 |
| Application number | US-202016832284-A |
| Country | US |
| Kind code | A1 |
| Filing date | Mar 27, 2020 |
| Priority date | Sep 29, 2017 |
| Publication date | Jul 16, 2020 |
| Grant date | — |
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Abstract
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Provided are a magnetic tape comprising a magnetic layer containing a ferromagnetic powder and a binding agent on a non-magnetic support, in which the magnetic layer contains an oxide abrasive, an average particle diameter of the oxide abrasive obtained from a secondary ion image acquired by irradiating a surface of the magnetic layer with a focused ion beam is 0.04 μm to 0.08 μm, and an absolute value ΔN of a difference between a refractive index Nxy measured with respect to an in-plane direction of the magnetic layer and a refractive index Nz measured with respect to a thickness direction of the magnetic layer is 0.25 to 0.40, and a magnetic recording and reproducing device including the magnetic tape.
First claim
Opening claim text (preview).
What is claimed is: 1 . A magnetic tape comprising a magnetic layer containing a ferromagnetic powder and a binding agent on a non-magnetic support, wherein the magnetic layer contains an oxide abrasive, an average particle diameter of the oxide abrasive obtained from a secondary ion image acquired by irradiating a surface of the magnetic layer with a focused ion beam is 0.04 μm to 0.08 μm, and an absolute value ΔN of a difference between a refractive index Nxy measured with respect to an in-plane direction of the magnetic layer and a refractive index Nz measured with respect to a thickness direction of the magnetic layer is 0.25 to 0.40. 2 . The magnetic tape according to claim 1 , wherein the oxide abrasive is an alumina powder. 3 . The magnetic tape according to claim 1 , wherein the ferromagnetic powder is a ferromagnetic hexagonal ferrite powder. 4 . The magnetic tape according to claim 1 , wherein the difference Nxy−Nz between the refractive index Nxy and the refractive index Nz is 0.25 to 0.40. 5 . The magnetic tape according to claim 1 , further comprising a non-magnetic layer containing a non-magnetic powder and a binding agent between the non-magnetic support and the magnetic layer. 6 . The magnetic tape according to claim 1 , further comprising a back coating layer containing a non-magnetic powder and a binding agent on a surface of the non-magnetic support opposite to a surface provided with the magnetic layer. 7 . A magnetic recording and reproducing device comprising: the magnetic tape according to claim 1 ; and a magnetic head. 8 . The magnetic recording and reproducing device according to claim 7 , wherein the oxide abrasive is an alumina powder. 9 . The magnetic recording and reproducing device according to claim 7 , wherein the ferromagnetic powder is a ferromagnetic hexagonal ferrite powder. 10 . The magnetic recording and reproducing device according to claim 7 , wherein the difference Nxy−Nz between the refractive index Nxy and the refractive index Nz is 0.25 to 0.40. 11 . The magnetic recording and reproducing device according to claim 7 , wherein the magnetic tape further comprises a non-magnetic layer containing a non-magnetic powder and a binding agent between the non-magnetic support and the magnetic layer. 12 . The magnetic recording and reproducing device according to claim 7 , wherein the magnetic tape further comprises a back coating layer containing a non-magnetic powder and a binding agent on a surface of the non-magnetic support opposite to a surface provided with the magnetic layer.
Assignees
Inventors
Classifications
Tape carriers · CPC title
specially adapted for achieving a specific property, e.g. average roughness [Ra] · CPC title
characterised by the dimension of the magnetic particles · CPC title
characterised by the surface treatment or coating of magnetic particles · CPC title
non-magnetic abrasive particles · CPC title
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Frequently asked questions
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- What does patent US2020227084A1 cover?
- Provided are a magnetic tape comprising a magnetic layer containing a ferromagnetic powder and a binding agent on a non-magnetic support, in which the magnetic layer contains an oxide abrasive, an average particle diameter of the oxide abrasive obtained from a secondary ion image acquired by irradiating a surface of the magnetic layer with a focused ion beam is 0.04 μm to 0.08 μm, and an absolu…
- Who is the assignee on this patent?
- Fujifilm Corp
- What technology area does this patent fall under?
- Primary CPC classification G11B5/708. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Thu Jul 16 2020 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). 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).