Patent ID: 6024249
Filing Date: 2000-02-15
Classification: B05C

Abstract:
A fluid delivery system for a semiconductor manufacturing operation for delivering fluid from a fluid container to a semiconductor wafer using an optical sensor to monitor the flow of fluid and presence of gas bubbles comprising:a fluid container connected to a fluid feed tube; said fluid container partially filled with a fluid;said fluid feed tube having an inlet end in said fluid in said fluid container and an outlet end above a semiconductor wafer; said outlet end comprising a nozzle;a suck back valve connected to said fluid feed tube between said fluid container and said outlet end;an optical sensor connected to said fluid feed tube between said suck back valve and said outlet end; said optical sensor not located in said nozzle;whereby said optical sensor monitors the flow of said fluid between said fluid container and said outlet end and stopping the flow of fluid when the fluid flowing past said optical sensor contains gas bubbles or flows unevenly.