Patent ID: 6119918
Filing Date: 2000-09-19
Classification: B23K

Abstract:
A solder head control mechanism comprising:a) a solder head movable vertically along a Z-axis normal to an X-Y axis plane;b) an acoustic coil linear servomotor located inside the solder head to move the solder head along the Z-axis;c) a position sensor for detecting the position of the solder head and generating a position signal indicative of the position of the solder head;d) a controller connected to the position sensor for receiving the position signal and generating a control signal; and,e) a current output actuator connected to the controller, the acoustic coil linear actuator and a power source to form a closed loop control system, the current output actuator controlling the acoustic coil linear actuator to move along a path determined by the principle of proportional integration differential according to the equation: ##EQU2## where: S(t)=the position of the solder head at time t;S.sub.max =total moving length;T.sub.max =total processing time.