| 摘要 |
PURPOSE:To adjust surface distance between the windings of the primary side and secondary side by improving the shape of bobbin body and forming a flange portion as the 2-division movable structure. CONSTITUTION:A bobbin 11 is slidable in the axial direction of a sleeve member 12 under the condition that the small diameter engaging portions of flange members 13a, 13b are engaged respectively with both ends of cylindrical sleeve member 12. First, under the narrow condition, the primary coil is wound for the specified turns on the sleeve member 12 (Fig. A). As shown in Fig. B, both flange members 13a, 13b are drawn in such a direction as separating each other as indicated by the arrow mark in order to obtain the wider condition. Thereafter, as shown in Fig. C, circumference of primary coil 15 is covered and fixed with an insulating material 16. Finally, as shown in Fig. D, a secondary coil 17 is wound for the required number of turns to the external circumference of insulating member 16. With such a structure, the surface distance between the primary coil 15 and secondary coil 17 can certainly be kept at the length longer than a certain value with the insulating member 16. |
