| 摘要 |
A bobbin includes a reinforcing fiber bundle formed in a wound shape, and the reinforcing fiber bundle is formed of a plurality of filaments. The reinforcing fiber bundle includes a first twist having a first value T1 per unit length (turn/m) at a first distance r1 from a center axis of the bobbin, a second twist having a second value T2 per unit length (turn/m) at a second distance r2 from the center axis of the bobbin, and a third twist having a third value T3 per unit length (turn/m) at a third distance r3 from the center axis of the bobbin; said reinforcing fiber bundle is disposed so that the following relations are concurrently satisfied: <?in-line-formulae description="In-line Formulae" end="lead"?>|T1/2pir1|>=|T2/2pir2|>=|T3/2pir3|<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>|T1/2pir1|>|T3/2pir3|<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>|T1|>=|T2|>=|T3|>=0.5<?in-line-formulae description="In-line Formulae" end="tail"?> where the first distance r1, the second distance r2, and the third distance r3 are different from each other (r1<>r2<>r3).
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