LIQUID DISCHARGE DEVICE, CAPACITIVE LOAD DRIVING CIRCUIT, AND CAPACITIVE LOAD DRIVING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a liquid discharge device capable of reducing the possibility that discharge accuracy of liquid is reduced.;SOLUTION: A liquid discharge device comprises: a modulation section generating a modulation signal obtained by pulse modulating a source signal based on a driving signal; an amplification section generating an amplification modulation signal obtained by amplifying the modulation signal; a demodulation section demodulating the amplification modulation signal and generating the driving signal; a piezoelectric element deformed by being applied with the driving signal; a cavity being filled with droplets therein and having the internal volume varying by deformation of the piezoelectric element; nozzles discharging liquid in the cavity in response to variations of the internal volume of the cavity; and a measurement section measuring a self-oscillation frequency being a frequency by which the modulation section, the amplification section and the demodulation section self-oscillate on the basis of the driving signal. The modulation section includes a phase control section controlling a phase of the modulation signal. The phase control section changes a control amount of the phase based on the self-oscillation frequency measured by the measurement section.;SELECTED DRAWING: Figure 10;COPYRIGHT: (C)2017,JPO&INPIT