Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

2007-04-24

2007-04-24

Tarazano, D. Lawrence (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Binder media

C428S842500, C428S845000, C427S130000

Reexamination Certificate

active

10823680

ABSTRACT:
The present invention provides a magnetic recording medium comprising a thin film magnetic layer of thickness in a range from 0.03 to 0.30 μm, and having excellent surface smoothness and superior electromagnetic conversion characteristics. The magnetic recording medium comprises a lower non-magnetic layer containing at least a non-magnetic powder and a binder resin on one surface of a non-magnetic support, an upper magnetic layer containing at least a ferromagnetic powder and a binder resin on the lower non-magnetic layer, and a back coat layer on the other surface of the non-magnetic support, wherein the thickness of the upper magnetic layer is within the range from 0.03 to 0.30 μm, the AFM surface roughness Ra of the upper magnetic layer is 6 nm or less, and the number of concavities with a depth of 30 nm or greater in the surface of the upper magnetic layer is 5 per 1 cm2of surface area or less.

REFERENCES:
patent: 6818298 (2004-11-01), Lowery et al.
patent: 6890646 (2005-05-01), Meguro et al.
patent: 2004/0209121 (2004-10-01), Yajima et al.
patent: 62-125537 (1987-06-01), None
patent: 9-185822 (1997-07-01), None
patent: 11-31322 (1999-02-01), None
Translation JA 11-031322.
Translation JA 09-185822.
JA 62-125537 abstract.

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