Head unit and liquid dispensing apparatus

A liquid dispensing apparatus comprising:

• a drive circuit configured to output a drive signal corrected based on a temperature information signal;
• and
• a head unit configured to dispense liquid when receiving the drive signal, wherein
• the head unit includes
• a unit temperature detection circuit configured to output a unit temperature signal including unit temperature information indicating a temperature of the head unit,
• a print head configured to dispense the liquid when receiving the drive signal,
• a dispensing counter configured to count a dispensing timing of the liquid from the print head, and
• a temperature information output circuit configured to acquire a temperature signal indicating a temperature of the print head and output the temperature information signal based on the temperature signal,
• the print head includes
• a piezoelectric element including a first electrode, a second electrode, and a piezoelectric body 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, the piezoelectric element being configured to be driven when receiving the drive signal,
• a vibration plate located at one side in the stacking direction with respect to the piezoelectric element and configured to be deformed when the piezoelectric element is driven,
• a pressure chamber substrate located at the one side in the stacking direction with respect to the vibration plate and provided with a pressure chamber whose volume changes when the vibration plate is deformed,
• a nozzle configured to dispense the liquid according to a change in volume of the pressure chamber, and
• a temperature signal acquisition unit located at the other side in the stacking direction with respect to the vibration plate and configured to acquire temperature information corresponding to a temperature of the pressure chamber and output the acquired temperature information as the temperature signal,
• the temperature information output circuit includes a correction circuit configured to correct the temperature signal, and
• the correction circuit corrects the temperature signal based on the unit temperature information at a predetermined timing after a count value of the dispensing timing reaches a predetermined value.