Patent ID: 7687972

Claim:
A drive wave generation circuit which generates a drive wave for driving a piezo actuator, comprising: a register configured to store fundamental waveform data, wherein the fundamental waveform data includes data for setting a duty ratio; a memory configured to store preset fundamental waveform data, wherein the preset fundamental waveform data includes data for setting a duty ratio; a serial interface configured to provide transferred fundamental waveform data to the register, wherein the transferred fundamental waveform data includes data for setting a duty ratio; a selector configured to select whether the register stores preset fundamental waveform data provided by the memory or transferred fundamental waveform data provided by the serial interface as the fundamental waveform data in the register; and a fundamental waveform generation circuit configured to generate a fundamental waveform; wherein the fundamental waveform has a duty cycle in accordance with the fundamental waveform data stored in the register, and wherein the drive wave is generated on the basis of the fundamental waveform data stored in the register.