Magnetic tape apparatus, magnetic tape, and magnetic tape cartridge
US-2024013807-A1 · Jan 11, 2024 · US
Magnetic tape
US2016093322A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2016093322-A1 |
| Application number | US-201514867752-A |
| Country | US |
| Kind code | A1 |
| Filing date | Sep 28, 2015 |
| Priority date | Sep 29, 2014 |
| Publication date | Mar 31, 2016 |
| Grant date | — |
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Abstract
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The magnetic tape comprises, on a nonmagnetic support, a nonmagnetic layer comprising nonmagnetic powder and binder, and on the nonmagnetic layer, a magnetic layer comprising ferromagnetic powder, nonmagnetic powder, and binder, wherein a total thickness of the magnetic tape is less than or equal to 4.80 μm, and a coefficient of friction as measured on a base portion of a surface of the magnetic layer is less than or equal to 0.35.
First claim
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What is claimed is: 1 . A magnetic tape, which comprises, on a nonmagnetic support, a nonmagnetic layer comprising nonmagnetic powder and binder, and on the nonmagnetic layer, a magnetic layer comprising ferromagnetic powder, nonmagnetic powder, and binder, wherein a total thickness of the magnetic tape is less than or equal to 4.80 μm; and a coefficient of friction as measured on a base portion of a surface of the magnetic layer is less than or equal to 0.35. 2 . The magnetic tape according to claim 1 , wherein the ferromagnetic powder is selected from the group consisting of ferromagnetic hexagonal ferrite powder and ferromagnetic metal powder. 3 . The magnetic tape according to claim 1 , wherein the nonmagnetic powder contained in the magnetic layer comprises two or more kinds of nonmagnetic powder with different Mohs hardness. 4 . The magnetic tape according to claim 1 , wherein the nonmagnetic powder contained in the magnetic layer comprises inorganic powder with Mohs hardness of higher than 8. 5 . The magnetic tape according to claim 1 , wherein the nonmagnetic powder contained in the magnetic layer comprises nonmagnetic colloidal particles. 6 . The magnetic tape according to claim 1 , wherein the nonmagnetic powder contained in the magnetic layer comprises inorganic powder with Mohs hardness of higher than 8 and nonmagnetic colloidal particles. 7 . The magnetic tape according to claim 1 , wherein the nonmagnetic powder contained in the magnetic layer comprises additional nonmagnetic powder together with inorganic powder with Mohs hardness of higher than 8 and nonmagnetic colloidal particles. 8 . The magnetic tape according to claim 7 , wherein the additional nonmagnetic powder is colcothar. 9 . The magnetic tape according to claim 1 , wherein a centerline average surface roughness Ra measured with a noncontact surface profile measuring apparatus on the surface of the magnetic layer is less than or equal to 1.8 nm. 10 . The magnetic tape according to claim 6 , wherein a centerline average surface roughness Ra measured with a noncontact surface profile measuring apparatus on the surface of the magnetic layer is less than or equal to 1.8 nm. 11 . The magnetic tape according to claim 7 , wherein a centerline average surface roughness Ra measured with a noncontact surface profile measuring apparatus on the surface of the magnetic layer is less than or equal to 1.8 nm. 12 . The magnetic tape according to claim 8 , wherein a centerline average surface roughness Ra measured with a noncontact surface profile measuring apparatus on the surface of the magnetic layer is less than or equal to 1.8 nm. 13 . The magnetic tape according to claim 1 , wherein the coefficient of friction measured on the base portion of the surface of the magnetic layer is less than or equal to 0.30. 14 . The magnetic tape according to claim 9 , wherein the coefficient of friction measured on the base portion of the surface of the magnetic layer is less than or equal to 0.30. 15 . The magnetic tape according to claim 10 , wherein the coefficient of friction measured on the base portion of the surface of the magnetic layer is less than or equal to 0.30. 16 . The magnetic tape according to claim 11 , wherein the coefficient of friction measured on the base portion of the surface of the magnetic layer is less than or equal to 0.30. 17 . The magnetic tape according to claim 12 , wherein the coefficient of friction measured on the base portion of the surface of the magnetic layer is less than or equal to 0.30. 18 . The magnetic tape according to claim 1 , which comprises a backcoat layer comprising nonmagnetic powder and binder on an opposite surface of the nonmagnetic support from a surface on which the nonmagnetic layer and magnetic layer are present.
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- What does patent US2016093322A1 cover?
- The magnetic tape comprises, on a nonmagnetic support, a nonmagnetic layer comprising nonmagnetic powder and binder, and on the nonmagnetic layer, a magnetic layer comprising ferromagnetic powder, nonmagnetic powder, and binder, wherein a total thickness of the magnetic tape is less than or equal to 4.80 μm, and a coefficient of friction as measured on a base portion of a surface of the magneti…
- 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 Mar 31 2016 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).