Patent ID: 7905578

Claim:
A liquid ejection head comprising: a nozzle plate which comprises a nozzle having a liquid supply inlet through which a liquid is supplied, a liquid ejection opening through which the liquid supplied from the liquid supply inlet is ejected, and a liquid supply path through which a liquid is supplied from the liquid supply inlet to the liquid ejection opening; a cavity which is communicated with the liquid supply inlet, and stores the liquid to be ejected from the liquid ejection opening; a pressure generating device which generates a pressure to the liquid in the cavity by changing a volume of the cavity; and an electrostatic voltage generating device which applies electrostatic voltage to generate an electrostatic attraction force between a base member on an opposing electrode and the liquid in the nozzle and the cavity, wherein a liquid supply inlet side of the nozzle plate is formed of a silicon layer, and a liquid ejection opening side of the nozzle plate is formed of at least a resin layer comprising thermosetting or photosensitive fluorine polymer having a volume resistivity of 10 15 Ωm or more and relative permittivity of 3 or less, and wherein a nozzle diameter on the liquid supply inlet side of the nozzle is greater than a nozzle diameter on the liquid ejection opening side of the nozzle.