Patent ID: 7135807

Claim:
A piezoelectric actuator drive system comprising: power supply means for supplying an operating voltage; drive control means for controlling generation of a forward/backward drive signal for a piezoelectric actuator in response to an operation ON select signal and a forward/backward driving select signal; clock generation means for generating a first clock signal in response to the operating voltage from the power supply means, the clock generation means includes: a reference clock generator for generating a reference clock signal, a first frequency divider for dividing a frequency of the reference clock signal in a first predetermined ratio to provide the first clock signal, and a second frequency divider for dividing the frequency of the reference clock signal in a second predetermined ratio to generate two clock signals having different duty ratios, and providing one of the generated clock signals as the second clock signal according to a level of the operating voltage from the power supply means; and drive signal generation means for generating the forward or backward drive signal to supplying to the piezoelectric actuator in response to the first clock signal from the clock generation means and the operating voltage from the power supply means under the forward/backward drive signal generation control of the drive control means.