Patent ID: 7472987

Claim:
A head module, comprising: a head body having a hollow interior; a nozzle plate including one wall surface of the head body; a transporting system for transporting a spacer dispersed liquid fed from a storing system to the head body, wherein an ejection hole is formed in the nozzle plate, and wherein the spacer dispersed liquid transported in the inside of the head body is discharged through the ejection hole; an internal filter through which the spacer dispersed liquid can pass disposed in the interior of the head body, wherein an inner space of the head body is divided into a discharging chamber on a side of the nozzle plate and a transporting chamber on a side opposite to the nozzle plate by the internal filter; and an inlet through which the spacer dispersed liquid is fed and an outlet through which the spacer dispersed liquid is drained are formed in a wall face of the transporting chamber while the inlet and the outlet are spaced from each other, wherein the transporting system comprises a pump for returning the spacer dispersed liquid drained through the outlet to the inlet.