Patent ID: 6119709
Filing Date: 2000-09-19
Classification: G03D,H01L,Y10T

Abstract:
A feeding apparatus for feeding a processing solution to a processing apparatus for performing predetermined processing, comprising:a container for storing the processing solution to be supplied to the processing apparatus;a first sensor for detecting a first liquid level at which the processing solution stored in said container needs to be replenished;a second sensor for detecting a second liquid level lower than the first liquid level;replenishing means for replenishing said container with a processing solution when the first liquid level is detected by said first sensor;a first timer starting to operate when the processing solution is replenished by said replenishing means and measuring time for a predetermined period of time;means for starting drainage of the processing solution in said container when the set time of said first timer expires without said first sensor detecting the first liquid level;a second timer starting to operate when drainage of the processing solution in said container is started and measuring time for a predetermined period of time; andmeans for starting replenishment of said container with a processing solution when the second liquid level is detected by said second sensor before the set time of said second timer expires.