Magnetic tape having controlled surface properties of the backcoat and magnetic layer and method of manufacturing the same
US-9984710-B2 · May 29, 2018 · US
Magnetic tape device and magnetic reproducing method
US2018182425A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2018182425-A1 |
| Application number | US-201715848173-A |
| Country | US |
| Kind code | A1 |
| Filing date | Dec 20, 2017 |
| Priority date | Dec 27, 2016 |
| Publication date | Jun 28, 2018 |
| Grant date | — |
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Abstract
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The magnetic tape device includes: a magnetic tape; and a reproducing head, in which the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, and logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050.
First claim
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What is claimed is: 1 . A magnetic tape device comprising: a magnetic tape; and a reproducing head, wherein the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, and logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050. 2 . The magnetic tape device according to claim 1 , wherein the logarithmic decrement is 0.010 to 0.050. 3 . The magnetic tape device according to claim 1 , wherein a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.8 nm. 4 . The magnetic tape device according to claim 3 , wherein the center line average surface roughness Ra is equal to or smaller than 2.5 nm. 5 . The magnetic tape device according to claim 1 , wherein the magnetic tape includes a non-magnetic layer including non-magnetic powder and a binding agent between the non-magnetic support and the magnetic layer, and a total thickness of the magnetic layer and the non-magnetic layer is equal to or smaller than 1.8 μm. 6 . The magnetic tape device according to claim 5 , wherein the total thickness of the magnetic layer and the non-magnetic layer is equal to or smaller than 1.1 μm. 7 . A magnetic reproducing method comprising: reproducing information recorded on a magnetic tape by a reproducing head, wherein the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, and logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050. 8 . The magnetic reproducing method according to claim 7 , wherein the logarithmic decrement is 0.010 to 0.050. 9 . The magnetic reproducing method according to claim 7 , wherein a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 2.8 nm. 10 . The magnetic reproducing method according to claim 9 , wherein the center line average surface roughness Ra is equal to or smaller than 2.5 nm. 11 . The magnetic reproducing method according to claim 7 , wherein the magnetic tape includes a non-magnetic layer including non-magnetic powder and a binding agent between the non-magnetic support and the magnetic layer, and a total thickness of the magnetic layer and the non-magnetic layer is equal to or smaller than 1.8 μm. 12 . The magnetic reproducing method according to claim 11 , wherein the total thickness of the magnetic layer and the non-magnetic layer is equal to or smaller than 1.1 μm.
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- What does patent US2018182425A1 cover?
- The magnetic tape device includes: a magnetic tape; and a reproducing head, in which the reproducing head is a magnetic head including a tunnel magnetoresistance effect type element as a reproducing element, the magnetic tape includes a non-magnetic support, and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, and logarithmic decrement acquired by…
- Who is the assignee on this patent?
- Fujifilm Corp
- What technology area does this patent fall under?
- Primary CPC classification G11B5/78. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Thu Jun 28 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 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).