Patent ID: 7661802

Claim:
A liquid droplet spraying apparatus, comprising: a plurality of nozzles that spray liquid droplets; a plurality of pressure chambers respectively connected to the plurality of nozzles, the pressure chambers each configured to store liquid to which spraying pressure is selectively applied; a common liquid chamber that stores the liquid to be supplied to the plurality of pressure chambers; and a plurality of narrowing portions, each including a first opening at one end thereof, which couples with the common liquid chamber, and a second opening at the other end thereof, which couples with a respective one of the pressure chambers, to supply the liquid from the common liquid chamber to the plurality of pressure chambers, the narrowing portions being larger in a pressure loss than the common liquid chamber and the plurality of pressure chambers; wherein a ratio of a length of each of the narrowing portions in a liquid flowing direction with respect to a length of a corresponding one of the pressure chambers in the liquid flowing direction is 0.34 or more, the liquid flowing direction corresponding to a direction in which the liquid flows through the narrowing portions; and wherein the length of each of the narrowing portions is defined as a minimal length between the first opening and the second opening.