Patent ID: 6817486
Filing Date: 2004-11-16
Classification: B05C,G03F

Abstract:
A photoresist supply apparatus comprising:a photoresist supply unit for supplying photoresist; an automatic on/off valve connected to the photoresist supply unit, for controlling the flow of photoresist supplied from the photoresist supply unit; a nozzle unit connected to the automatic on/off valve, for ejecting photoresist; a photoresist flow length measurer for measuring a flow length of photoresist remaining at a tip of the nozzle unit after interrupt of ejection through the nozzle unit; a measured data processor for converting data measured by the photoresist flow length measurer into an electrical signal; and a valve controller for finely controlling the flow length of photoresist remaining at the nozzle unit in response to the electrical signal fed back from the measured data processor, wherein the valve controller is comprised of a speed controller that comprises a stepping motor and an air control unit which is connected to the stepping motor and controls the amount of air discharging, to thereby control the amount of air flowing into the automatic on/off valve.