Balanced delay and resolution for timing based servo systems
US-10141016-B2 · Nov 27, 2018 · US
Magnetic tape and magnetic tape device
US9779772B1 · US · B1
| Field | Value |
|---|---|
| Publication number | US-9779772-B1 |
| Application number | US-201715464991-A |
| Country | US |
| Kind code | B1 |
| Filing date | Mar 21, 2017 |
| Priority date | Mar 22, 2016 |
| Publication date | Oct 3, 2017 |
| Grant date | Oct 3, 2017 |
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- Title
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Abstract
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The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on a nonmagnetic support, wherein a timing based servo pattern is present on the magnetic layer, the centerline average surface roughness Ra that is measured on the surface of the magnetic layer is less than or equal to 1.8 nm, and the coefficient of friction that is measured on the base portion of the surface of the magnetic layer is less than or equal to 0.35.
First claim
Opening claim text (preview).
What is claimed is: 1. A magnetic tape, which comprises a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein a timing based servo pattern is present on the magnetic layer; a centerline average surface roughness Ra that is measured on a surface of the magnetic layer is less than or equal to 1.8 nm; and a coefficient of friction that is measured on a base portion of the surface of the magnetic layer is less than or equal to 0.35. 2. The magnetic tape according to claim 1 , wherein the coefficient of friction that is measured on the base portion falls within a range of 0.15 to 0.35. 3. The magnetic tape according to claim 1 , wherein the coefficient of friction that is measured on the base portion falls within a range of 0.15 to 0.30. 4. The magnetic tape according to claim 1 , wherein the centerline average surface roughness Ra falls within a range of 1.2 nm to 1.8 nm. 5. The magnetic tape according to claim 1 , wherein the centerline average surface roughness Ra falls within a range of 1.2 nm to 1.6 nm. 6. The magnetic tape according to claim 1 , which comprises a nonmagnetic layer comprising nonmagnetic powder and binder between the nonmagnetic support and the magnetic layer. 7. The magnetic tape according to claim 1 , wherein the coefficient of friction that is measured on the base portion fails within a range of 0.20 to 0.35; and the centerline average surface roughness Ra falls within a range of 1.5 nm to 1.8 nm. 8. A magnetic tape device, which comprises a magnetic tape, a magnetic head and a servo head, wherein the magnetic tape is a magnetic tape which comprises a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein a timing based servo pattern is present on the magnetic layer; a centerline average surface roughness Ra that is measured on a surface of the magnetic layer is less than or equal to 1.8 nm; and a coefficient of friction that is measured on a base portion of the surface of the magnetic layer is less than or equal to 0.35. 9. The magnetic tape device according to claim 8 , wherein the coefficient of friction that is measured on the base portion falls within a range of 0.15 to 0.35. 10. The magnetic tape device according to claim 8 , wherein the coefficient of friction that is measured on the base portion falls within a range of 0.15 to 0.30. 11. The magnetic tape device according to claim 8 , wherein the centerline average surface roughness Ra falls within a range of 1.2 nm to 1.8 nm. 12. The magnetic tape device according to claim 8 , wherein the centerline average surface roughness Ra falls within a range of 1.2 nm to 1.6 nm. 13. The magnetic tape device according to claim 8 , wherein the magnetic tape comprises a nonmagnetic layer comprising nonmagnetic powder and binder between the nonmagnetic support and the magnetic layer. 14. The magnetic tape device according to claim 8 , wherein the coefficient of friction that is measured on the base portion falls within a range of 0.20 to 0.35; and the centerline average surface roughness Ra falls within a range of 1.5 nm to 1.8 nm.
Assignees
Inventors
Classifications
- G11B5/5926Primary
recorded in separate tracks, e.g. servo tracks · CPC title
Tape carriers · CPC title
- G11B5/712Primary
characterised by the surface treatment or coating of magnetic particles · CPC title
on a base layer · CPC title
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- What does patent US9779772B1 cover?
- The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on a nonmagnetic support, wherein a timing based servo pattern is present on the magnetic layer, the centerline average surface roughness Ra that is measured on the surface of the magnetic layer is less than or equal to 1.8 nm, and the coefficient of friction that is measured on the base portion of the surface of …
- Who is the assignee on this patent?
- Fujifilm Corp
- What technology area does this patent fall under?
- Primary CPC classification G11B5/5926. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Oct 03 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B1). 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).