| 摘要 |
PURPOSE:To raise outputs and resolution of a reproducing signal, and also to improve S/N by reducing noise of a recording medium, by controlling the surface roughness of the recording medium to a specified range, and bringing a quantitative decrease and a qualitative variation on the surface roughness. CONSTITUTION:Calender processing and lapping processing of a magnetic tape are executed so that a probability distribution in a 50% amplitude level of an Abbot load curve of surface roughness of a magnetic layer on a magnetic recording medium is 0.45-0.9, and also a value of a tertiary moment standardized by a value of the 2/3 power of a secondary moment of a surface roughness curve has a surface roughness distribution of +0.5--1.0. As for this lapping processing, a relative speed between a lapping tape and the magnetic tape is set to 0.1-1.0m/sec, and it is executed under the condition that a pressing force of the lapping tape is set to 2-200g/cm<2>, and the surface roughness is reduced quantitatively, and also its qualitative variation is induced.
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