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The magnetic tape includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which the magnetic layer has a servo pattern, and an absolute value ΔN of a difference between a refractive index Nxy measured regarding an in-plane direction of the magnetic layer and a refractive index Nz measured regarding a thickness direction of the magnetic layer is 0.25 to 0.40, a magnetic tape cartridge and a magnetic tape apparatus including this magnetic tape.

Titel:	MAGNETIC TAPE, MAGNETIC TAPE CARTRIDGE, AND MAGNETIC TAPE APPARATUS
Link:	Zum Volltext
Veröffentlichung:	2020
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Applications Sprachen: English Document Number: 20200035265 Publication Date: January 30, 2020 Appl. No: 16/522894 Application Filed: July 26, 2019 Assignees: FUJIFILM Corporation (Tokyo, JP) Claim: 1. A magnetic tape comprising: a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, wherein the magnetic layer has a servo pattern, and an absolute value ΔN of a difference between a refractive index Nxy measured regarding an in-plane direction of the magnetic layer and a refractive index Nz measured regarding a thickness direction of the magnetic layer is 0.25 to 0.40. Claim: 2. The magnetic tape according to claim 1, wherein the difference Nxy−Nz between the refractive index Nxy and the refractive index Nz is 0.25 to 0.40. Claim: 3. The magnetic tape according to claim 1, further comprising: a non-magnetic layer including non-magnetic powder and a binding agent between the non-magnetic support and the magnetic layer. Claim: 4. The magnetic tape according to claim 3, wherein a total thickness of the magnetic layer and the non-magnetic layer is equal to or smaller than 0.60 μm. Claim: 5. The magnetic tape according to claim 1, further comprising: a back coating layer including non-magnetic powder and a binding agent on a surface of the non-magnetic support opposite to a surface provided with the magnetic layer. Claim: 6. The magnetic tape according to claim 1, wherein the servo pattern is a timing-based servo pattern. Claim: 7. A magnetic tape cartridge, which comprises a magnetic tape comprising: a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, wherein the magnetic layer has a servo pattern, and an absolute value ΔN of a difference between a refractive index Nxy measured regarding an in-plane direction of the magnetic layer and a refractive index Nz measured regarding a thickness direction of the magnetic layer is 0.25 to 0.40. Claim: 8. The magnetic tape cartridge according to claim 7, wherein the difference Nxy−Nz between the refractive index Nxy and the refractive index Nz is 0.25 to 0.40. Claim: 9. The magnetic tape cartridge according to claim 7, wherein the magnetic tape further comprises a non-magnetic layer including non-magnetic powder and a binding agent between the non-magnetic support and the magnetic layer. Claim: 10. The magnetic tape cartridge according to claim 9, wherein a total thickness of the magnetic layer and the non-magnetic layer is equal to or smaller than 0.60 μm. Claim: 11. The magnetic tape cartridge according to claim 7, wherein the magnetic tape further comprises a back coating layer including non-magnetic powder and a binding agent on a surface of the non-magnetic support opposite to a surface provided with the magnetic layer. Claim: 12. The magnetic tape cartridge according to claim 7, wherein the servo pattern is a timing-based servo pattern. Claim: 13. A magnetic tape apparatus comprising: a magnetic head; and a magnetic tape comprising: a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, wherein the magnetic layer has a servo pattern, and an absolute value ΔN of a difference between a refractive index Nxy measured regarding an in-plane direction of the magnetic layer and a refractive index Nz measured regarding a thickness direction of the magnetic layer is 0.25 to 0.40. Claim: 14. The magnetic tape apparatus according to claim 13, wherein the difference Nxy−Nz between the refractive index Nxy and the refractive index Nz is 0.25 to 0.40. Claim: 15. The magnetic tape apparatus according to claim 13, wherein the magnetic tape further comprises a non-magnetic layer including non-magnetic powder and a binding agent between the non-magnetic support and the magnetic layer. Claim: 16. The magnetic tape apparatus according to claim 15, wherein a total thickness of the magnetic layer and the non-magnetic layer is equal to or smaller than 0.60 μm. Claim: 17. The magnetic tape apparatus according to claim 13, wherein the magnetic tape further comprises a back coating layer including non-magnetic powder and a binding agent on a surface of the non-magnetic support opposite to a surface provided with the magnetic layer. Claim: 18. The magnetic tape apparatus according to claim 13, wherein the servo pattern is a timing-based servo pattern. Current International Class: 11; 11; 11; 11

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MAGNETIC TAPE, MAGNETIC TAPE CARTRIDGE, AND MAGNETIC TAPE APPARATUS