| 摘要 |
PURPOSE:To improve the recording characteristic within a high density range by including metallic magnetic powder having a prescribed characteristic into a magnetic layer and applying orientation so as to attain >=1,000 gauss of vertical residual magnetic flux density. CONSTITUTION:As the metallic magnetic powder, powder having uniaxial anisotropy, needle shape and <=0.4mu of grain diameter is used. When the grain diameter is larger than 0.4mu, the surface smoothness of a magnetic tape is deteriorated and a short wavelength output is deteriorated. The powder like this is coated on the base by an optional means such as roll coater or gravure coating together with a binder resin and the base is dried while being orientated vertically by using a rod magnet with a magnetic field in vertical direction to the base. Then, the vertical residual mangetic flux density of the magnetic layer thus obtained is taken as >=1,000 gauss. |
