IP Library › Granted Patent US 12,300,276
Granted Patent B2
US 12,300,276 · App. 18/421,433 · Granted May 13, 2025

Magnetic tape having characterized magnetic layer, magnetic tape cartridge, and magnetic tape apparatus

Inventor: Norihito Kasada (Minamiashigara, JP)
Assignee: FUJIFILM Corporation
G11B33/04G11B5/7026G11B5/7028G11B5/70678
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Quick Facts
Patent No.
US 12,300,276
App. No.
18/421,433
Granted
May 13, 2025
Kind
B2
Abstract

Provided is a magnetic tape, in which, in an environment of a temperature of 23° C. and a relative humidity of 50%, an AlFeSil abrasion value 45° of a magnetic layer surface measured at a tilt angle of 45° of an AlFeSil square bar is 20 μm or more and 50 μm or less, standard deviation of an AlFeSil abrasion value of the magnetic layer surface measured at each of tilt angles of 0°, 15°, 30°, and 45° of the AlFeSil square bar is 30 μm or less. The tilt angle of the AlFeSil square bar is an angle formed by a longitudinal direction of the AlFeSil square bar and a width direction of the magnetic tape. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape.

Claims (36)

1. A magnetic tape comprising:

a non-magnetic support; and

a magnetic layer containing a ferromagnetic powder,

wherein, in an environment of a temperature of 23° C. and a relative humidity of 50%,

an AlFeSil abrasion value 45° of a magnetic layer surface measured at a tilt angle of 45° of an AlFeSil square bar is 20 μm or more and 50 μm or less,

standard deviation of an AlFeSil abrasion value of the magnetic layer surface measured at each of tilt angles of 0°, 15°, 30°, and 45° of the AlFeSil square bar is 30 μm or less, and

the tilt angle of the AlFeSil square bar is an angle formed by a longitudinal direction of the AlFeSil square bar and a width direction of the magnetic tape.

2. The magnetic tape according to claim 1 ,

wherein the standard deviation of the AlFeSil abrasion value is 15 μm or more and 30 μm or less.

3. The magnetic tape according to claim 1 ,

wherein standard deviation of a curvature in a longitudinal direction of the magnetic tape is 5 mm/m or less.

4. The magnetic tape according to claim 1 ,

wherein the magnetic layer contains one or more non-magnetic powders.

5. The magnetic tape according to claim 4 ,

wherein the non-magnetic powder includes an alumina powder.

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

a non-magnetic layer containing a non-magnetic powder between the non-magnetic support and the magnetic layer.

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

a back coating layer containing a non-magnetic powder on a surface side of the non-magnetic support opposite to a surface side having the magnetic layer.

8. The magnetic tape according to claim 1 ,

wherein a vertical squareness ratio of the magnetic tape is 0.60 or more.

9. The magnetic tape according to claim 1 ,

wherein the standard deviation of the AlFeSil abrasion value is 15 μm or more and 30 μm or less,

standard deviation of a curvature in a longitudinal direction of the magnetic tape is 5 mm/m or less,

the magnetic layer contains an alumina powder,

a non-magnetic layer containing a non-magnetic powder is provided between the non-magnetic support and the magnetic layer,

a back coating layer containing a non-magnetic powder is provided on a surface side of the non-magnetic support opposite to a surface side having the magnetic layer, and

a vertical squareness ratio of the magnetic tape is 0.60 or more.

10. A magnetic tape cartridge comprising:

the magnetic tape according to claim 1 .

11. A magnetic tape apparatus comprising:

the magnetic tape according to claim 1 .

12. The magnetic tape apparatus according to claim 11 , further comprising:

a magnetic head,

wherein the magnetic head has a module including an element array with a plurality of magnetic head elements between a pair of servo signal reading elements, and

the magnetic tape apparatus changes an angle θ formed by an axis of the element array with respect to a width direction of the magnetic tape during running of the magnetic tape in the magnetic tape apparatus.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 24, 2024
From: KASADA, NORIHITO
To: FUJIFILM CORPORATION
Reel/Frame 066233/0996 →
Priority Claims (2)
JP 2021-121714 · Jul 26, 2021 · national
JP 2021-165991 · Oct 8, 2021 · national
Continuity (2)
Continuation PCTJP2022028292 · Jul 21, 2022
Related Publication 20240221791A1 · Jul 4, 2024
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