Patent ID: 7658471

Claim:
A droplet jet head comprising: a nozzle substrate having a plurality of nozzle holes that eject droplets; a cavity substrate having recesses whose bottoms serve as diaphragms, and the recesses serving as ejection chambers for storing the droplets; an electrode substrate having separate electrodes opposed to the diaphragms and driving the diaphragms; a reservoir substrate having a recess serving as a common droplet chamber for supplying droplets to the ejection chambers, through holes for transferring the droplets from the common droplet chamber to the ejection chambers, and nozzle communicating holes for transferring the droplets from the ejection chambers to the nozzle holes; and a driver IC that supplies a driving signal to the separate electrodes; wherein the cavity substrate has a first hole, and the reservoir substrate has a second hole, the first hole and the second hole communicating with each other to form a housing, and the driver IC being housed in the housing; the first hole passes through the cavity substrate; the second hole passes through the reservoir substrate; and the housing is closed by the nozzle substrate, the cavity substrate, the reservoir substrate, and the electrode substrate.