Patent ID: 8721015

Claim:
A droplet discharge device comprising: a functional liquid droplet discharge head configured and arranged to discharge functional liquid; and a functional liquid tank including a tank body configured and arranged to retain the functional liquid to be supplied to the functional liquid droplet discharge head, the tank body having a first connecting hole and a second connecting hole, a liquid column pipe communicating with the tank body through the first connecting hole and the second connecting hole of the tank body, a liquid level detection mechanism configured and arranged to detect a liquid level of the functional liquid retained in the liquid column pipe, a float member accommodated within the tank body, and a float-regulating member having a facing portion that faces a descending end position of the float member, the facing portion of the float-regulating member being located in the tank body in a position between the first connecting hole and the second connecting hole such that the facing portion regulates the descending end position of the float member when the float member descends as a liquid level within the tank body descends, the functional liquid tank being configured and arranged to allow supplying and ventilating of gas.