| 摘要 |
PROBLEM TO BE SOLVED: To improve the traveling property, output and light shieldability and to suppress the adhesion of dust by electrification by providing the rear surface side of a base provided with a magnetic layer on its front surface side with a back coating layer contg. magnetite powder having a specified plate diameter and plate shape ratio. SOLUTION: The front surface side of the base 2 is provided with an intermediate layer 5 and the magnetic layer 3 in this order and the rear surface side thereof is provided with the back coating layer 4 contg. the magnetite powder having the plate diameter of 0.05 to 2.0μm and the plate shape ratio of 3 to 40 and carbon black. The thickness of the layer 3 is specified to 0.05 to 1.0μm. Acicular ferromagnetic metallic powder having coercive force of 1500 to 2400 Oe or hexagonal ferrite powder having coercive force of 1300 to 2300 Oe is incorporated into the layer. The magnetic recording medium 1 composed of such base 2 and the layers 3 to 5 is improved in rigidity and is improved in the electrical conductivity of the layer 4 as well. As a result, the traveling property is improved, the output is enhanced and the light shieldability is enhanced, thereby, the control of the traveling system is improved and the adhesion of the dust by electrification is suppressed.
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