Patent ID: 8336994

Claim:
A droplet ejection device comprising: a first member including a droplet ejection surface which has a plurality of nozzles opening thereon and a flat bonding surface which lies opposite to the droplet ejection surface, the droplet ejection surface being curved corresponding to a curved surface onto which the nozzles eject droplets; a second member bonded to the bonding surface of the first member; a plurality of pressure chambers arranged on a plane parallel to the bonding surface, each of the pressure chambers is configured to store liquid to which ejection pressure is applied; and a plurality of communication passages establishing communication between the pressure chambers and the nozzles, respectively, wherein: each of the communication passages extends along a direction orthogonal to the bonding surface from a corresponding one of the pressure chambers to a corresponding one of the nozzles; the nozzles comprise first and second nozzles, and openings of the second nozzles are arranged farther from an axis of the first member than openings of the first nozzles are arranged from the axis of the first member, wherein the axis extends in a direction orthogonal to the droplet ejection surface and passes though a center of the first member, and openings of two of the first nozzles and two of the second nozzles are arranged symmetrically, with respect to the axis, in a direction along a curving of the ejection surface; and the pressure chambers comprise first and second pressure chambers, wherein each of the first pressure chambers communicates with a corresponding one of the first nozzles and extends from a corresponding one of the first nozzles toward the axis in a direction parallel to the plane, and each of the second pressure chambers communicates with a corresponding one of the second nozzles and extends from a corresponding one of the second nozzles away from the axis in a direction parallel to the plane.