Patent ID: 6896736
Filing Date: 2005-05-24
Classification: H01L

Abstract:
1. A photoresist supply device of semiconductor wafer coating equipment, comprising: a plurality of photoresist storage bottles; a plurality of supply pipes respectively connected to the plurality photoresist bottles; a supply line connected to said supply pipes downstream thereof; at least one flow direction control valve disposed in line with said supply pipes upstream of said supply line and movable, in response to a control signal, to place a selected one of any of the supply pipes in communication with said supply line; a dispense pump operatively connected to said supply line so as to pressurize photoresist in the supply line; a nozzle disposed at an end of said supply line to spray the photoresist pressurized by said dispense pump; a purge start input member actuatable to issue a purge start command signal; an electronic timer; and a controller operatively connected to said purge start input member so as to receive the purge start command signal therefrom when the input member is actuated, and operatively connected to said electronic timer, said dispense pump and said at least one valve so as to control the operations of said dispense pump and said at least one valve according to a sequence established using said timer, wherein the supply pipes and the supply line are automatically purged of photoresist once the command signal is received.