| 摘要 |
<p>This invention relates to a bobbin for a voice coil produced by forming a cylindrical member by use of a composite sheet material which is prepared by letting a glass fiber sheet material be impregnated with a synthetic resin and has an inclination function obtained by curing completely only one of the surfaces of the sheet material with the other surface left uncured, so that the outer surface of the cylindrical member is the uncured surface with the inner surface being the completely cured surface.</p> |
