Patent ID: 9352557
Filing Date: 2016-05-31
CPC Classification: B41J,H03K

Claim Text:
1. A liquid discharge apparatus comprising: a modulation circuit that generates a modulated signal by pulse-modulating a source signal through self-oscillation; a transistor that amplifies the modulated signal to generate an amplified modulated signal; a low-pass filter that includes an inductor and a capacitor and smoothes the amplified modulated signal to generate a drive signal; a feedback circuit that allows the drive signal to return to the modulation circuit; a piezoelectric element that is displaced by application of the drive signal thereto; a cavity that is filled with a liquid inside and has an internal volume which changes when the piezoelectric element is displaced; and a nozzle that is provided to discharge the liquid inside the cavity in response to the change of the internal volume of the cavity, wherein a self-resonant frequency of the capacitor is higher than a frequency of the self-oscillation.