Patent ID: 8100493

Claim:
A liquid jet apparatus comprising: a plurality of nozzles; an actuator provided for each nozzle and connected to the respective nozzle; and a drive unit for applying a drive signal to the actuator, wherein the drive unit includes: a drive waveform generator for generating a drive waveform signal for controlling the drive of the actuator; a modulator for performing a pulse modulation of the drive waveform signal to produce a modulated signal; a digital power amplifier for power amplifying the modulated signal to produce an amplified signal; a low-pass filter for smoothing the amplified signal and supplying the drive signal to the actuator; and a modulation signal correcting unit that corrects the modulated signal according to a variable power supply voltage of the digital power amplifier by calculating the power supply voltage based on to the number of actuators which are to be driven by the drive waveform signal, and wherein the modulation signal correcting unit corrects the modulated signal before the modulated signal is power amplified by the digital power amplifier.