Patent ID: 8449084

Claim:
A liquid ejection head comprising: a flow-channel-containing substrate comprising pressure generating chambers communicating with a nozzle opening; and a piezoelectric element comprising a first electrode, a piezoelectric layer disposed above the first electrode, and a second electrode disposed above the piezoelectric layer, wherein the piezoelectric layer comprises: an active portion which is substantially driven, comprising a laterally central portion and a lateral edge; a non-active portion which is not substantially driven, wherein a boundary is defined between the edge of the active portion and the non-active portion; and a low dielectric material layer which has a dielectric constant lower than that of the central portion of the active portion and which is disposed at the active portion side of the boundary between the active portion and the non-active portion at the edge of the active portion, wherein no low dielectric material layer is provided at the central portion of the active portion.