Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

2005-08-16

2005-08-16

Resan, Stevan A. (Department: 1773)

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

C428S328000, C428S690000

Reexamination Certificate

active

06929850

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 150Am2/kg;coercive force Hc(A)90 to 180kA/m,saturation magnetization σs(B)100 to 200Am2/kg,coercive force Hc(B)100 to 200kA/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.
patent: 40 08 134 (1990-09-01), None
patent: 42 04 739 (1992-09-01), None

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