Magnetic tape and magnetic tape device

Patent metadata

Field	Value
Publication number	US-11514944-B2
Application number	US-201916361814-A
Country	US
Kind code	B2
Filing date	Mar 22, 2019
Priority date	Mar 23, 2018
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

The magnetic tape includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer has 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, and an isoelectric point of a surface zeta potential of the magnetic layer is equal to or greater than 5.5.

First claim

What is claimed is:

1. A magnetic tape comprising:
a non-magnetic support; and
a magnetic layer including a ferromagnetic powder and a binding agent on the non-magnetic support,
wherein the magnetic layer has 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, and
an isoelectric point of a surface zeta potential of the magnetic layer is equal to or greater than 5.5.

2. The magnetic tape according to claim 1 ,
wherein the isoelectric point is 5.5 to 7.0.

3. The magnetic tape according to claim 1 ,
wherein the binding agent is a binding agent including an acidic group.

4. The magnetic tape according to claim 3 ,
wherein the acidic group includes at least one kind of acidic group selected from the group consisting of a sulfonic acid group and a salt thereof.

5. 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.

6. The magnetic tape according to claim 1 , further comprising:
a non-magnetic layer including a non-magnetic powder and a binding agent between the non-magnetic support and the magnetic layer.

7. The magnetic tape according to claim 1 , further comprising:
a back coating layer including a non-magnetic powder and a binding agent on a surface of the non-magnetic support opposite to a surface provided with the magnetic layer.

8. A magnetic tape device comprising:
the magnetic tape according to claim 1 ;
a magnetic head; and
a servo head.

Assignees

• Fujifilm Corp

Inventors

• Kasada Norihito

Classifications

• G11B5/00813

  magnetic tapes · CPC title

• G11B5/702 Primary

  characterised by the bonding agent · CPC title

• G11B5/78 Primary

  Tape carriers · CPC title

• G11B5/70678

  Ferrites · CPC title

• G11B5/735

  characterised by the back layer {(magnetic recording media substrates G11B5/739)} · CPC title