Patent ID: 7087118

Claim:
A coating unit for forming a coating film on a substrate by supplying a coating solution to the substrate from a coating solution discharge nozzle, comprising: a container configured to house the substrate in an inside thereof; solvent-atmosphere generating means for supplying solvent vapor of the coating solution to the inside of said container to generate a solvent atmosphere at a predetermined concentration within the inside of said container; intake means for sucking the atmosphere to the inside of said container; a sensor for detecting a concentration of the solvent atmosphere in the inside of said container; control means for controlling operation of said solvent-atmosphere generating means and operation of said intake means based on the concentration detected by said sensor; a cover which opens or closes an inlet/outlet of the container; a slit formed on the cover to extend in an X direction; a nozzle moving mechanism which reciprocates the coating solution discharge nozzle in the X direction along the slit; and a container drive mechanism which moves the container in a Y direction intersecting the slit.