Ink ejecting device

An ink ejecting device comprising:

• a first cavity plate formed with an array of first pressure chambers storing ink;
• a second cavity plate formed with an array of second pressure chambers storing the ink;
• an array of nozzles formed in one of the first and second cavity plates to eject ink therefrom;
• an actuator disposed between the first and second cavity plates and having pressure generating portions between its opposed surfaces, each pressure generating portion being provided for one of the first pressure chambers and one of the second pressure chambers and being deformable to shift the opposed surfaces of the actuator partially and substantially symmetrically;
• wherein the first pressure chambers face one of the opposed surfaces of the actuator while the second chambers face the other surface, and each first pressure chamber and a corresponding one of the second pressure chambers communicate with each other and also communicate with a corresponding one of the nozzles.

An ink ejecting device comprising:

• a first cavity plate including:
• a common ink chamber that stores ink;
• and
• a first pressure chamber that receives the ink from the common ink chamber;
• a second cavity plate having a second pressure chamber that receives the ink from the common ink chamber;
• an actuator having a deformable portion and disposed between the first and second cavity plates such that the deformable portion is placed between the first and second pressure chambers;
• a first ink passage that communicates with the common ink chamber and the first and second pressure chambers;
• a nozzle from which the ink is ejected, and
• a second ink passage that communicates with the first and second pressure chambers and the nozzle.

An ink ejecting device comprising:

• a nozzle from which ink is ejected;
• an actuator having first and second opposing surfaces, the actuator being operable to shift the first and second surfaces substantially symmetrically;
• a first pressure chamber that stores the ink and is disposed to face the first surface of the actuator;
• and
• a second pressure chamber that stores the ink and is disposed to face the second surface of the actuator;
• the actuator having a through-hole through which the ink passes, the through hole being in communication with the nozzle and with the first and second pressure chambers.