Magnetic tape, magnetic tape cartridge, and magnetic tape apparatus
US-2024112697-A1 · Apr 4, 2024 · US
Magnetic tape
US2018240475A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2018240475-A1 |
| Application number | US-201815900106-A |
| Country | US |
| Kind code | A1 |
| Filing date | Feb 20, 2018 |
| Priority date | Feb 20, 2017 |
| Publication date | Aug 23, 2018 |
| Grant date | — |
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- Title
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Abstract
Official abstract text for this publication.
The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which a center line average surface roughness Ra measured regarding the surface of the magnetic layer is equal to or smaller than 1.8 nm, a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer includes an abrasive, and a tilt cos θ of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 1.00.
First claim
Opening claim text (preview).
What is claimed is: 1 . A magnetic tape comprising: a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, wherein a center line average surface roughness Ra measured regarding the surface of the magnetic layer is equal to or smaller than 1.8 nm, a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer includes an abrasive, and a tilt cos θ of the ferromagnetic hexagonal ferrite powder with respect to a surface of the magnetic layer acquired by cross section observation performed by using a scanning transmission electron microscope is 0.85 to 1.00. 2 . The magnetic tape according to claim 1 , wherein the logarithmic decrement is 0.010 to 0.050. 3 . The magnetic tape according to claim 1 , wherein the center line average surface roughness Ra is 1.2 nm to 1.8 nm. 4 . The magnetic tape according to claim 2 , wherein the center line average surface roughness Ra is 1.2 nm to 1.8 nm. 5 . The magnetic tape according to claim 1 , further comprising: a non-magnetic layer including 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 including non-magnetic powder and a binding agent on a surface side of the non-magnetic support opposite to the surface side provided with the magnetic layer.
Assignees
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Classifications
by controlling the position of the rotating heads (by controlling the speed of the record carrier G11B15/467; by controlling speed of the heads G11B15/473; {by moving the transducing part of the head relative to the headwheel, in the direction of the scanning movement G11B15/1841}) · CPC title
in a magnetic field · CPC title
Ferrites · CPC title
- G11B5/7085Primary
non-magnetic abrasive particles · CPC title
- G11B5/71Primary
characterised by the lubricant · CPC title
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- What does patent US2018240475A1 cover?
- The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which a center line average surface roughness Ra measured regarding the surface of the magnetic layer is equal to or smaller than 1.8 nm, a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of t…
- Who is the assignee on this patent?
- Fujifilm Corp
- What technology area does this patent fall under?
- Primary CPC classification G11B5/7085. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Thu Aug 23 2018 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).