| 摘要 |
PURPOSE:To prevent an undesired current produced by a disturbance current component by winding a shielding wire or a coaxial cable around an annular magnetic matter in the different left and right directions and leading the lead- out wire from a vertically symmetrical position. CONSTITUTION:A shielding wire or a coaxial cable 2 is wound around left and right rod-shaped parts 1a and 1b of a circular magnetic matter 1 alternately with right turn at the part 1a and the left turn at the part 1b respectively. Then lead-out wires 2a and 2b are led out from upper and lower bent parts 1c and 1d respectively. A choke coil of such a constitution is inserted to a connection line to a power supply line or a signal line which performs transfer of signals with another device. In such a constitution, the total sum is not set at zero for the disturbance current flowing the section of the shielding or coaxial cable 2. Thus it is possible to prevent the disturbance current contained in an input/output current. Furthermore the disturbance due to the capacitive coupling of a lead wire can be effectively avoided. |
