The present invention is a drive control device for controlling an electric rotational
actuator which moves the driver, including: a reference comparison signal generation
circuit; a detection circuit for detecting the speed of the actuator and outputting
this as a detection signal; a speed designation circuit of the actuator; a rotation
control circuit of the actuator; and a phase comparison circuit for comparing the
phase of the reference comparison signal and the phase of the detection signal
and outputting the comparison result to the rotation control circuit; wherein the
rotation control circuit controls the speed of the actuator to conform with the
speed designation based on the phase comparison result.
