Liquid ejection apparatus and print head

A liquid ejection apparatus comprising:

• a control circuit that outputs a control signal;
• a drive signal output circuit that outputs a drive signal;
• a carriage configured to reciprocate along a scanning axis intersecting a transport direction in which a medium is transported;
• and
• a print head that receives the control signal and the drive signal and ejects a liquid, the print head being mounted on the carriage, wherein
• the print head includes
• a piezoelectric element that includes a first electrode, a second electrode, and a piezoelectric body and in which the piezoelectric body is located between the first electrode and the second electrode in a stacking direction in which the first electrode, the second electrode, and the piezoelectric body are stacked, and that is driven by receiving the drive signal,
• a vibration plate that is located on one side of the stacking direction with respect to the piezoelectric element and is deformed by driving the piezoelectric element,
• a pressure chamber substrate that is located on the one side of the stacking direction with respect to the vibration plate and is provided with a plurality of pressure chambers of which volumes change due to deformation of the vibration plate,
• a switch circuit that switches whether or not to supply the drive signal to the piezoelectric element,
• a wiring substrate that is provided with the switch circuit, and
• a temperature detection portion that is located on the other side of the stacking direction with respect to the vibration plate, is electrically coupled to the wiring substrate, and detects temperature information of the pressure chamber, and
• the temperature information detected by the temperature detection portion in a period in which the switch circuit does not supply the drive signal to the piezoelectric element and in which the carriage is stopped and is located in a reverse region in which a scanning direction of the carriage along the scanning axis is reversed is input to the control circuit.