| 摘要 |
PURPOSE:To eliminate the generating of shrinkage and void in the protective insulating tape by having the coil wound around the protective tape provided with an intermittent slit having an acute angle lengthwise after the tape is wound on the bent core. CONSTITUTION:An intermittent slit 16 having an acute angle theta lengthwise is provided on the protective insulating tape 14 coated with an adhesive 15 on one side thereof. The acute angle is properly set at about 30 deg.. The protective insulating tape 14 is wound with coil wire after wound on the bent core 17. With such an arrangement, even when the bent core is used for the coil block of the wrist watch or the like in view of its advantage, no shrinkage nor void is generated in the protective insulating tape 14 thereby making it smaller and thinner. |
