Patent ID: 8773098

Claim:
A capacitive load drive circuit which applies a predetermined drive signal to drive a capacitive load, comprising: a drive waveform generator which generates a drive waveform signal; a modulator which pulse-modulates the drive waveform signal to generate a modulated signal in which a first voltage state and a second voltage state which is lower in voltage than the first voltage state are repeated; a digital power amplifier which power-amplifies the modulated signal to generate an amplified digital signal; a low pass filter which smoothes the amplified digital signal to generate the drive signal to be applied to the capacitive load; and a power amplification stopping section which stops operation of the digital power amplifier in a signal invariable period which is a period in which the drive waveform signal is to be a constant value, wherein in the signal invariable period, the power amplification stopping section stops an operation of the digital power amplifier, either when half a period of time when the modulated signal in the first voltage state maintains the first voltage state elapses or when half a period of time when the modulated signal in the second voltage state maintains the second voltage state elapses.