Print head, liquid ejection apparatus, and piezoelectric element control circuit

A liquid ejection apparatus comprising:

• a drive circuit that outputs a drive signal;
• a piezoelectric element that includes a first electrode supplied with the drive signal and a second electrode supplied with a reference voltage signal and is displaced by a difference in electric potential between the first electrode and the second electrode;
• a cavity that is filled with a liquid ejected from a nozzle along with the displacement of the piezoelectric element;
• a vibration plate that is disposed between the cavity and the piezoelectric element;
• a gate circuit that is electrically connected to a ground;
• a first switch circuit that switches between supplying and not supplying the drive signal to the first electrode;
• and
• a second switch circuit that switches between electrically connecting and not electrically connecting the gate circuit and the first electrode.

A piezoelectric element control circuit controlling a piezoelectric element of a print head including the piezoelectric element that includes a first electrode supplied with a drive signal and a second electrode supplied with a reference voltage signal and is displaced by a difference in electric potential between the first electrode and the second electrode, a cavity that is filled with a liquid ejected from a nozzle along with the displacement of the piezoelectric element, and a vibration plate that is disposed between the cavity and the piezoelectric element, the piezoelectric element control circuit comprising:

• a gate circuit that is electrically connected to a ground;
• a first switch circuit that switches between supplying and not supplying the drive signal to the first electrode;
• and
• a second switch circuit that switches between electrically connecting and not electrically connecting the gate circuit and the first electrode.