Apparatus for activating a heat conductive wire by detecting a rotating angle of a wiper arm

An apparatus which is coupled to a wiper assembly comprising a wiper arm which supports a wiper body which supports a wiper blade, a crank equipped under the hood of a vehicle for transferring a driving force to the wiper arm, and a wiper motor for developing said driving force for reciprocating said wiper arm whose one end is connected to the crank, said apparatus comprising:

• a heat conductive wire made of electrical resistant material for outputting heat in response to electric current;
• a wiping angle detector for sensing a rotating angle of said wiper arm;
• a data storage element storing data regarding the rotating angle of said wiper arm;
• a controlling element generating a controlling signal for activating the heat conductive wire when the rotating angle detected by said wiping angle detector is less than a predetermined angle;
• an electric power supply providing electric current for activating the heat conductive wire;
• a transistor for conducting electric current from an emitter to a collector in response to the controlling signal produced by said controlling element;
• and a relay switch which is turned on by means of electromotive force induced by electric current conducted from said transistor,
• whereby said heat conductive wire is eventually activated when said rotating angle of the wiper arm is less than the predetermined angle.