Patent ID: 6742993
Filing Date: 2004-06-01
Classification: F04B,Y10T

Abstract:
An apparatus for dispensing chemicals used in semiconductor fabrication processes, comprising:a reservoir for storing a supply of a chemical used in fabrication of semiconductors; a dispense point from which the chemical is dispensed; a pump in fluid communication with the reservoir for pumping a desired volume of the chemical out of the dispense point, the pump including, a piston reciprocating within a pumping chamber and displacing a known volume based on a distance that it is displaced, the movement of the piston causing displacement of chemical from a pumping chamber to the dispense point; a diaphragm partially supported by the piston and extending between the piston and sides of the pumping chamber, the diaphragm having associated with it deformation during at least a portion of a pumping cycle, the deformation resulting in displacement from the pumping chamber of a lesser volume of chemical than the volume displaced by the piston; and a controller mechanism for moving the piston to dispense the chemical through the dispense point, the controller mechanism accounting for predicted deformation of the diaphragm during dispensing in order to pump the desired volume of the chemical.