Patent ID: 6027760
Filing Date: 2000-02-22
Classification: B05C,B05D,G03F

Abstract:
An apparatus for spin coating surfaces with liquid polymer comprisinga spin coating chamber having a rotatable chuck for supporting an object to be coated,a distributor communicating with the coating chamber and positioned to introduce gases into the chamber,a solvent vapor and carrier gas supply means for supplying a carrier gas having a controlled level of solvent vapor therein within the range of from 0 to saturation concentrations of solvent vapor,a solvent vapor sensor positioned with respect to the coating chamber to produce signals which are a function of the concentration of solvent vapor in the coating chamber, andcontrol means connected to the solvent vapor concentration sensor and to said solvent vapor and carrier gas supply means for controlling the level of solvent vapor in the carrier gas supplied by the solvent vapor and carrier gas supply means.