| 摘要 |
PROBLEM TO BE SOLVED: To ensure both good electromagnetic conversion characteristics and durability even when an aromatic polyamide film of 5 mm thick or less is employed. SOLUTION: The magnetic recording medium is formed by providing a magnetic layer 2 comprising a thin metallic magnetic film on a nonmagnetic support 1A comprising an aromatic polyamide film of 5.0μm thick or less. A continuous coating 1B of 100 nm thick or less principally comprising a water soluble polymer and fine particles having mean grain of 5-200 nm is formed at least on one side of the nonmagnetic support 1A. The fine particles C form fine protrusions on the surface at a frequency of 5,000,000-50,000,000/mm2 wherein the height of the protrusions is 10-50 nm and the ratio t/d between the thickness t of the continuous coating 1B and the mean grain size d of the fine particles dis in the range of 0.1-4. The nonmagnetic support 1A has Young's modulus of 1000 kg/mm2 or above in the longitudinal direction and Young's modulus of 1300 kg/mm2 or above in the widthwise direction.
|
