Patent ID: 8807713

Claim:
A liquid ejection head, comprising: multiple tubular pressure chambers that respectively communicate with ejection orifices for ejecting liquid, and hold the liquid to be ejected from the ejection orifices, wall portions constituting the multiple tubular pressure chambers being formed of a piezoelectric material and configured to eject the liquid from the ejection orifices by deforming the piezoelectric material; and a stacked body in which first substrates formed of a piezoelectric material and second substrates formed of a piezoelectric material are stacked alternately with each other, wherein, on one face of each of the first substrates, multiple first grooves and multiple second grooves are formed, the multiple first grooves extending in a first direction and constituting the multiple tubular pressure chambers together with one of the second substrates, the multiple second grooves being arranged alternately with the multiple first grooves and constituting spaces together with the one of the second substrates, wherein, on a face of each of the second substrates that is opposed to a face brought into contact with the one face of each of the first substrates, multiple third grooves are formed which extend in the first direction and which constitute the spaces together with one of the first substrates, wherein, in the multiple first grooves of each of the first substrates, inner surface electrodes are formed which extend from inside the multiple first grooves to each outer side of the multiple first grooves, wherein counter electrodes extending in the first direction are formed in the face of each of the second substrates that is brought into contact with the one face of each of the first substrates in places opposed to the multiple first grooves, and wherein a width W 1 of each of the inner surface electrodes, a width W 2 of each of the counter electrodes, and a width W P of each of the multiple first grooves satisfy a relation of W P <W 2 <W 1 in a second direction, which is perpendicular to the first direction and to a stacking direction of the stacked body.