| 摘要 |
PURPOSE:To measure easily a gap depth without requiring an X-ray inspection and a destructive inspection, by forming a reference surface for deriving a target gap depth, on the opposite side of a magnetic recording medium. CONSTITUTION:A recording and reproducing gap G1 and an erasing gap G2 are formed to a target value, a recording and reproducing core 4 and an erasing core 5 are joined, and thereafter, a grinding surface, namely, the opposite side of a medium sliding part is brought to facing so as to become a reference of all and it becomes a reference surface W. Next, based on the reference surface W as a reference, sizes T1, T2 to parts 7a, 8a and a size T3 to a grinding surface N for determining a gap depth of the gaps G1, G2 are measured in advance. Slider supporting parts 6, 7 are joined, and thereafter, ground to a shape for obtaining a soft contact to a medium, and a target gap depth is formed. In this case, the size T3 extending from the reference surface W to the grinding surface N is measured, and compared with the sizes T1, T2 which have been measured in advance, by which the gap depth being in the course of working can be known, and target gap depths D1, D2 are measured with high accuracy.
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