Patent ID: 6320298
Filing Date: 2001-11-20
Classification: H02N

Abstract:
An actuator driving circuit comprising:a drive pulse signal generator which generates a drive pulse signal having a specified ultrasonic frequency, and supplies it to drive an actuator; anda drive voltage generator which generates a drive voltage for drive pulse signal generation upon receipt of a power supplied from a power source, and supplies it to the drive pulse signal generator;the relationship between the frequency of power noise cyclically produced from the drive voltage generator and imposed on the drive voltage and the frequency of the drive pulse signal being so set as to satisfy the following equation:4000<.vertline.m.multidot.f1-n.multidot.f2.vertline.whereinm: positive integer below a specified value;n: positive integer below a specified value;f1:frequency of power noise; andf2:frequency of the drive pulse signal.