Patent ID: 7988068

Claim:
A liquid ejection head, comprising: a pressure chamber which is connected to a nozzle; diaphragm which constitutes one face of the pressure chamber; a piezoelectric element which deforms the diaphragm for ejecting liquid inside the pressure chamber through the nozzle; an electrode for applying a drive voltage to the piezoelectric element; a heater that controls temperature of said liquid ejection head; and a partition separating the pressure chamber from an adjacent pressure chamber, wherein the heater is disposed opposite to the partition through the diaphragm, and the heater controls the temperature so that the liquid is ejected by driving the piezoelectric element in a temperature region between a first limit temperature and a second limit temperature higher than the first limit temperature, the first limit temperature being, not lower than a temperature at which the piezoelectric d constant of the piezoelectric element becomes a maximum value, and the second limit temperature not exceeding a lower one of a Curie point of the piezoelectric element and a boiling point of the liquid.