The present invention discloses a structure of package socket and package legs for three-primary-color LED and the manufacturing method of this structure. Each of the geometric shapes has a volume of less than 0. The width of the main electrode portion is the same as that of the dielectric layers, and the width of the lead portion is smaller than that of the dielectric layers. A voltage generation circuit sets the potential of the second terminal to a potential higher than a vehicle earth potential. There is also described a control system for an electric motor, wherein sensorssensing means are provided arranged at suitable measuring points in the system or motor circuit connected to the safety function unit and arranged so that when there is no control signal to the relays, the contacts of both relays are energized and the motor stops.