Patent ID: 8167403

Claim:
A droplet ejector comprising: at least one head unit set each composed of four head units which are disposed in a staggered manner in an arrangement direction on a plane; a head supporting member which supports said at least one head unit set; a liquid supplier which supplies liquid to said at least one head unit set; and a conveyor mechanism which conveys, in an area opposing said at least one head unit set, an ejection target in a direction in parallel to the plane; each of the head units including: a passage structure having plural nozzles disposed in the arrangement direction and a liquid passage connected to the nozzles; and a liquid supply opening which is provided at an edge of passage structure in the arrangement direction and which is connected to the liquid passage and the liquid supplier, the passage structures of two of the head units neighboring each other in the arrangement direction being arranged so that the respective edges where the liquid supply openings are provided oppose each other in the arrangement direction.