Patent ID: 6056998
Filing Date: 2000-05-02
Classification: H01L

Abstract:
A coating apparatus comprising:a coating solution supply source for supplying a coating solution;a mounting table for holding a substrate to allow a surface to be coated to face upward;a nozzle for pouring the coating solution toward the surface of the substrate to be coated, mounted on the mounting table;a pump chamber having a sucking port for introducing the coating solution from the coating solution supply source and a spurting port for spurting the coating solution to be supplied toward the nozzle;a pump driving mechanism for increasing or decreasing an inner pressure of the pump chamber to introduce and spurt the coating solution into/from the pump chamber;a filter provided inside or at the upstream side of the pump chamber for filtrating the coating solution so as to remove a gel and particles from the coating solution before the coating solution is spurted out from the pump chamber through the spurting port;a valve provided between the pump chamber and the nozzle for regulating a flow amount of the coating solution to be sent from the pump chamber to the nozzle; anda controller for controlling the operation of the pump driving mechanism in such a manner that a sucking speed of the coating solution into the pump chamber is smaller than a spurting speed of the coating solution from the pump chamber, said sucking speed allowing the coating solution to pass through the filter but not allowing the gel and particles to pass through the filter.