Patent ID: 8152275

Claim:
A liquid droplet jetting apparatus which jets a droplet of a liquid, comprising: a common liquid chamber to which the liquid is supplied; a plurality of pressure chambers which communicate with the common liquid chamber and which causes a pressure change in the liquid; a plurality of nozzles which communicate with the pressure chambers respectively, and each of which jets the droplet of the liquid; a pressure attenuation chamber which has a throttled portion having a cross-sectional area smaller than a cross-sectional area of the common liquid chamber, and an attenuation portion having a cross-sectional area greater than the cross-sectional area of the throttled portion, the attenuation portion being connected to the common liquid chamber via the throttled portion; a discharge port which is formed in the pressure attenuation chamber; a discharge channel which is connected to the discharge port and having a throttle in which a channel area of the discharge channel is decreased; and a dummy nozzle which is connected to the discharge port via the discharge channel, and which is open to an atmosphere.