Electrically foldable rearview mirrors

An electrical control system for an electrically powered foldable rearview mirror having a mirror body movable between a folded state and an erected state, said electrical control system comprising:

• a reversible motor contained in a mirror body movable between a folded state and an erected state;
• motor drive circuit means connected to the reversible motor to drive the motor body between the folded state and the erected state;
• mechanical stop means to stop rotation of said mirror body when said mirror body reaches the erected state and also when said mirror body reaches the folded state;
• noncontacting sensor means for detecting a halt to motor rotation as a result of a halt of mirror body rotation;
• control circuit means for interruption of said motor drive circuit means when said noncontacting sensor means detects the halt of motor rotation, said control circuit means including power circuit means;
• switching means for switching the motor drive circuit means on and off, said switching means including a switching transistor having a base;
• sensor circuit means connected to said noncontacting sensor means to generate a plurality of pulses according to a rotation frequency of said motor;
• and
• sensor pulse processing means including a differentiation circuit having a capacitor and resistor, and wherein said differentiation circuit is connected electrically to the sensor circuit mean, the capacitor of the differentiation circuit is charged and discharged by said pulses and is connected to the base of the switching transistor to turn said switching transistor off and on.