Patent ID: 7244523

Claim:
A magnetic tape manufactured by feeding a broad magnetic tape including a broad support, a magnetic recording layer formed on one surface of the broad support and a back coat layer formed on the other surface of the broad support to a portion between a disk-like upper blade and a disk-like lower blade overlapping each other and rotating in opposite directions and cutting it into magnetic tapes each having a predetermined width and in which a position where an irregular raised and depressed pattern of a cut surface of the support on the side of the upper blade becomes locally maximal or a position where an irregular raised and depressed pattern of a cut surface of the support on the side of the lower blade becomes locally maximal satisfies 40≦100BU/T≦70 or 40≦100BL/T≦70, where BU is the distance from the surface of the back coat layer to the position where the irregular raised and depressed pattern of the cut surface of the support on the side of the upper blade becomes locally maximal, BL is the distance from the surface of the back coat layer to the position where the irregular raised and depressed pattern of the cut surface of the support on the side of the lower blade becomes locally maximal and T is the total thickness of the broad magnetic tape and in which a ratio of BU/T to BL/T is equal to or larger than 0.9 and equal to or smaller than 1.1.