Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1997-02-27

1999-12-07

Resan, Stevan A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428212, 428323, 428694BM, 428694BR, 428694SG, 428900, G11B 5716

Patent

active

059979879

ABSTRACT:
This invention intends to offer a magnetic recording medium which is so devised as to give a wide dynamic range and a flat response over whole audible frequencies.
This invention attains the object by providing a magnetic recording medium which has two magnetic layers each composed mainly of ferromagnetic powder and a binder spread one over the other on one surface (front surface) of a non-magnetic substrate, wherein the ferromagnetic powder of either magnetic layer has a coercive force of 54.0-59.0 kA/m, and the coercive forces of the two magnetic layers differ by 3.2 kA/m or less. In addition, if a phase shift has to be minimized, the frictional coefficient of the back surface, and roughness (Ra.sup.f) of the magnetic surface with respect to that (Ra.sup.b) of the back surface or Ra.sup.f /Ra.sup.b should be adjusted properly.

REFERENCES:
patent: 4624883 (1986-11-01), Yamaguchi et al.
patent: 5043210 (1991-08-01), Yamakawa et al.
patent: 5051303 (1991-09-01), Noguchi et al.
patent: 5082729 (1992-01-01), Nishida et al.
patent: 5085915 (1992-02-01), Taga et al.

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