Patent ID: 6221157
Filing Date: 2001-04-24
Classification: B05C,H01L

Abstract:
An apparatus for spin dispensing a liquid onto a wafer said apparatus comprising:a rotatable chuck;a shaft attached to said chuck;a spin motor attached to said shaft;a liquid dispense assembly positioned relative to the wafer;a bowl having a bottom and a side defining an interior region, said bottom containing an opening in which said shaft is movably disposed therethrough and said rotatable chuck is disposed within said interior region;a drain opening through said bottom of said bowl; andan upstanding baffle attached to said bottom of said bowl, and extending around a portion of said drain opening to limit access into said drain from a predetermined annular direction, said upstanding baffle having a surface curved about an axis perpendicular to said bottom of said bowl to limit flow only in the direction of rotation of said rotatable chuck and an air ring attached to said bowl for directing a liquid dispensed within said bowl in a desired direction within said interior region.