| 摘要 |
PROBLEM TO BE SOLVED: To make such a magnetic recording medium compatible in electromagnetic conversion characteristics and a good traveling property of a magnetic recording medium, that uses a nonmagnetic base having surface roughness to some extent so that the good traveling property may be maintained even if a back-coating layer is not formed. SOLUTION: This medium is so constituted that a magnetic layer formed by dispersing ferromagnetic powder into a binder are formed on the nonmagnetic base by a calender treatment stage. At this time, the magnetic layer has a double-layered structure consisting of a lower magnetic layer and an upper magnetic layer thereon. The gap quantity of the lower magnetic layer before the calender treatment is 30 to 45 vol.%. In addition, the medium is so formed as to satisfy the equation 0.03<=D±2σ<0.08 when the standard deviation of the average diameter D (μm) of the gaps is defined asσ.
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