| 摘要 |
PURPOSE:To curtail a manufacturing time of coil and to accurately control a number of windings of coil and keep the size constant, by providing a connecting conductor which electrically connects conductor patterns and by folding a printed circuit board. CONSTITUTION:The internal ends of respective conductive patterns 23-26 are connected to connecting conductors 27a-27d provided within substrates 22a- 22d. These connecting conductors 27a-27d are formed by filling conductive material into the through holes bored through the substrates 22a-22d. An electrical coil 21 having a large number of coil windings can be configurated immediately by folding a flexible printed circuit board 22 forming thereon a conductive pattern. Moreover, since a conductive pattern can recently be formed on a very thin flexible printed circuit board by the conductive printed circuit baord technique, increase of thickness can be suppressed even in case an electrical coil 21 is formed by folding such flexible printed board. |
