MAGNETIC TAPE AND MAGNETIC TAPE DEVICE

• US 20170372726A1
• Filed: 06/13/2017
• Published: 12/28/2017
• Est. Priority Date: 06/23/2016
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: KASADA, Norihito, KANEKO, Tetsuya, OZAWA, Eiki
• Granted Patent: US 10,431,249 B2
• Time in Patent Office: Days
• CPC Class Codes: G11B 5/00813 magnetic tapes
• CPC Class Codes: G11B 5/584 for track following on tapes
• CPC Class Codes: G11B 5/59633 Servo formatting G11B5/59627, G11B5/59677, G11B5/59683, G11B5/59688 take precedence
• CPC Class Codes: G11B 5/59688 Servo signal format patterns or signal processing thereof, e.g. dual, tri, quad, burst signal patterns
• CPC Class Codes: G11B 5/70 on a base layer
• CPC Class Codes: G11B 5/71 characterised by the lubricant
• CPC Class Codes: G11B 5/712 characterised by the surface treatment or coating of magnetic particles
• CPC Class Codes: G11B 5/78 Tape carriers

Abstract

The magnetic tape includes a magnetic layer having ferromagnetic powder and a binder on a non-magnetic support, in which a total thickness of the magnetic tape is equal to or smaller than 5.30 μm, the magnetic layer includes a timing-based servo pattern, a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, one or more components selected from the group consisting of fatty acid and fatty acid amide are included in the magnetic layer, and a C—H derived C concentration calculated from a C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %.

Claims

1. A magnetic tape comprising:

a non-magnetic support; and

a magnetic layer including ferromagnetic powder and a binder on the non-magnetic support,

wherein a total thickness of the magnetic tape is equal to or smaller than 5.30 μ

m,

the magnetic layer includes a timing-based servo pattern,

a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm,

one or more components selected from the group consisting of fatty acid and fatty acid amide are included in the magnetic layer, and

a C—

H derived C concentration calculated from a C—

H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %.

2. The magnetic tape according to claim 1,

wherein the C—

H derived C concentration is in a range of 45 to 80 atom %.

3. The magnetic tape according to claim 1,

wherein the C—

H derived C concentration is in a range of 50 to 80 atom %.

4. The magnetic tape according to claim 1, further comprising:

a non-magnetic layer including non-magnetic powder and a binder, between the non-magnetic support and the magnetic layer.

5. The magnetic tape according to claim 4,

wherein one or more components selected from the group consisting of fatty acid and fatty acid amide are respectively included in the magnetic layer and the non-magnetic layer.

6. The magnetic tape according to claim 1,

wherein the center line average surface roughness Ra measured regarding the surface of the magnetic layer is 1.2 nm to 1.8 nm.

7. The magnetic tape according to claim 1,

wherein the total thickness of the magnetic tape is 3.00 μ

m to 5.30 μ

m.

8. The magnetic tape according to claim 1, further comprising:

a back coating layer including non-magnetic powder and a binder on a surface of the non-magnetic support opposite to the surface including the magnetic layer.

9. A magnetic tape device comprising:

a magnetic tape;

a magnetic head; and

a servo head, wherein

the magnetic tape is a magnetic tape comprising;

a non-magnetic support; and

a magnetic layer including ferromagnetic powder and a binder on the non-magnetic support,

wherein a total thickness of the magnetic tape is equal to or smaller than 5.30 μ

m,

the magnetic layer includes a timing-based servo pattern,

a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm,

one or more components selected from the group consisting of fatty acid and fatty acid amide are included in the magnetic layer, and.

a C—

H derived C concentration calculated from a peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is equal to or greater than 45 atom %.

10. The magnetic tape device according to claim 9,

wherein the derived C concentration is in a range of 45 to 80 atom %.

11. The magnetic tape device according to claim 9,

wherein the C—

H derived C concentration is in a range of 50 to 80 atom %.

12. The magnetic tape device according to claim 9,

wherein the magnetic tape further comprises a non-magnetic layer including non-magnetic powder and a binder, between the non-magnetic support and the magnetic layer.

13. The magnetic tape device according to claim 12,

wherein one or more components selected from the group consisting of fatty acid and fatty acid amide are respectively included in the magnetic layer and the non-magnetic layer of the magnetic tape.

14. The magnetic tape device according to claim 9,

wherein the center line average surface roughness Ra measured regarding the surface of the magnetic layer is 1.2 nm to 1.8 nm.

15. The magnetic tape device according to claim 9,

wherein the total thickness of the magnetic tape is 3.00 μ

m to 5.30 μ

m.

16. The magnetic tape device according to claim 9,

wherein the magnetic tape further comprises a back coating layer including non-magnetic powder and a binder on a surface of the non-magnetic support opposite to the surface including the magnetic layer.