Patent ID: 6740163
Filing Date: 2004-05-25
Classification: B05C,G03F,H01L

Abstract:
An apparatus for performing dip coating of a layer of a resist material on a pair of opposed surfaces of a disk-shaped substrate comprising:a dip coating vessel having an interior space adapted for containing therein a liquid for said dip coating, said dip coating liquid comprising a solution of said resist material in a solvent, said dip coating vessel being open at the top thereof; a disk-shaped substrate mounting means for introducing into and withdrawing a disk-shaped substrate from said interior space of said dip coating vessel via said open top, said substrate mounting means including (1) means for vertically mounting said disk-shaped substrate comprising a pair of oppositely facing major surfaces to be simultaneously dip coated by immersion in said dip coating liquid contained in said dip coating vessel, and (2) means for rotating said disk-shaped substrate about a central axis; and a viscosity control system for monitoring and maintaining the viscosity of said dip coating liquid supplied to said dip coating vessel at a predetermined value.