Patent ID: 9558972
Date: 2017-01-31
CPC Classifications: H01L

Claim:
1. A liquid treatment apparatus comprising: a treatment chamber in which liquid treatment is performed to a treatment object; and a clean gas supply mechanism that supplies the treatment chamber with a clean gas, wherein the clean gas supply mechanism includes: a supply path having an upstream end provided with a gas intake port and a downstream end connected to the treatment chamber; a fan disposed in the supply path to form in the supply path a flow of the clean gas flowing from the gas intake port toward the treatment chamber; a filter disposed upstream of the fan in the supply path; a return path that branches from the supply path at a first position downstream of the fan and upstream of the treatment chamber, and that is connected to the supply path at a second position downstream of the filter and upstream of the fan; and a switching mechanism that selectively switches between a first state where the switching mechanism causes the clean gas flowing downstream from the fan to flow into the treatment chamber, and a second state where the switching mechanism causes the clean gas flowing downstream from the fan to return to the supply path through the return path.