| 摘要 |
PURPOSE:To eliminate noise voltage by a method wherein a main pickup coil is provided with a sub pickup which is not intersecting with the signal flux of the main pickup but intersecting with disturbance flux. CONSTITUTION:The coil 13 is arranged in neighboring with the coil 12 and in parallel to the axis of the coil 12. The external flux intersects with both coils with the same angle substantially. Both coils are coiled into reverse directions mutually, therefore, generate noise voltages having reverse polarities mutually with respect to the external flux. Both coils are connected in series, therefore, the noise voltages are cancelled each other out and the level of the noise, duplicating on an ignition signal, may be reduced remarkably. |
