| 摘要 |
Disclosed are a reel structured such that a recording tape can be wound on a hub without interference with a pair of flanges provided in opposing relationship to each other, and a method of designing such a reel. The hub is formed in a tapered shape, and a taper angle of the hub is determined from an expression theta<sin-1(G/L), where G is a spacing along an axial direction of the hub between the edge of the recording tape on the larger-diameter end portion of the hub at a winding start end of the recording tape and the flange on the larger-diameter side, and L is a winding length of the recording tape which is required to establish a state in which the recording tape can withstand a given tension when wound onto the hub.
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