| 摘要 |
PURPOSE:To enable an igniter of a car and the like to have its radio wave noise prevented from occurring in AM band, by converting into AM frequency band, resonance frequency of series circuit, composed of a condenser and a lead wire between a primary coil and the main body of an engine. CONSTITUTION:The capacity of a condenser 9 and the inductance of a lead wire 10 are determined so that resonance frequency of series connecting circuit composed of the condenser 9 and the lead wire 10 may be converted into AM broadcasting frequency band. The lead wire 10 consists of a wire 10' connected to an exterior resistor 4 for an ignition coil, and a wire 10'' connected to a distributor body 14 or its fitting metal 15. By thus, making capacity of the condenser 9 and inductance of the lead wire 10 resonate by 1MHz, for example, a radio wavenoise curve 3 can be improved by about 7-8dB as compared with a curve 1 without a condenser and a curve 2 in which resonance is not taken in consideration. |
