| 摘要 |
A liquid supply unit includes a main tank, a sub-tank, a pressure supply mechanism, an air communication hole, an air-permeable film and an excess pressure dispersion unit. The main tank stores liquid. The sub-tank is provided in a jet device, which ejects liquid droplets, and connected to the main tank. The pressure supply mechanism applies predetermined pressured to liquid in the main tank for supplying the liquid to the sub-tank. The air communication hole is provided on an upper surface of the sub-tank and communicates inside of the sub-tank with atmospheric air. The air-permeable film is provided for closing the air communication hole. The air-permeable film passes air, but not liquid. The excess pressure dispersion unit disperses excess pressure from the liquid supply unit when the liquid in the sub-tank becomes in contact with the air-permeable film and the pressure inside the sub-tank becomes higher than the predetermined pressure.
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