Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

2005-12-06

2005-12-06

Resan, Stevan A. (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Binder media

C428S839600

Reexamination Certificate

active

06972158

ABSTRACT:
The present invention provides a magnetic recording medium which can record both digital and analog signals by, e.g., VTR for commercial use and improve their electromagnetic conversion characteristics. A magnetic recording medium comprises a nonmagnetic support, and first and second magnetic layers comprised respectively of magnetic powder (A) and (B), wherein the first and second magnetic layers are formed on the nonmagnetic support in this order, wherein the magnetic powder (A) and (B) have the following characteristics:saturation magnetization σs(A): 80 to 150 Am2/kg;coercive force Hc(A): 90 to 180 kA/m,saturation magnetization σs(B): 100 to 200 Am2/kg,coercive force Hc(B): 100 to 200 kA/m,wherein the first and second magnetic layers satisfy the below relationships and have thickness T(A) and T(B) in the below ranges:in-line-formulae description="In-line Formulae" end="lead"?σs(A)/σs(B)≦1.0,Hc(A)/Hc(B)≦1.0,in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.0 μm≦T(A)≦4.0 μm, 0.01 μm≦T(B)≦0.5 μm.in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 5098773 (1992-03-01), Saito et al.
patent: 5582910 (1996-12-01), Araki et al.

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