Patent ID: 7503643

Claim:
A liquid droplet discharge head, comprising: a first pressure chamber which is filled with a fluid; an actuator which displaces at least one portion of a surface defining the first pressure chamber and which includes a piezoelectric element; a plurality of nozzles which discharge droplets of a discharge liquid; a plurality of second pressure chambers which are connected to the plurality of nozzles and are filled with the discharge liquid to be discharged from the plurality of nozzles; a common flow channel which accommodates the discharge liquid to be supplied to the plurality of second pressure chambers; a plurality of individual supply channels which connect the plurality of second pressure chambers with the common flow channel, the discharge liquid being supplied from the common flow channel to the plurality of second pressure chambers through the plurality of individual supply channels; and a pressure transmitting section which transmits pressure generated in the first pressure chamber due to driving of the actuator to the plurality of second pressure chambers, wherein: taking a surface area of a point of application of a force by the actuator which displaces the first pressure chamber to be S 1 , and taking a surface area of a point of action of a force applied to each of the plurality of second pressure chambers by means of the pressure transmitting section to be S 2 , a relationship S 1 >S 2 is satisfied; and the droplets of the discharge liquid are discharged from each of the plurality of nozzles by means of a discharge force being applied to the discharge liquid inside each of the plurality of second pressure chambers through the pressure transmitting section.