Patent ID: 6391111
Filing Date: 2002-05-21
Classification: B05C,H01L

Abstract:
A coating apparatus, which comprises:a nozzle that discharges a coating liquid to an object to be treated; a container that accommodates the coating liquid; a discharge pump, said pump disposed between the nozzle and the container, that sends the coating liquid in the container to the nozzle; a valve disposed between the discharge pump and the nozzle and provided with a speed control device capable of controlling electrically a switching speed; a controller device that controls the operation of the discharge pump; and a pressure detector that detects pressure of the coating liquid on the downstream side of the discharge pump; wherein the controller device is a device which further controls the operation of the valve based on the detected pressure of the coating liquid, and wherein the valve comprises a switching valve and a suck-back valve, and further comprises valve controller that exclusively controls the operation of the switching valve and the suck-back valve.