Patent ID: 6158447
Filing Date: 2000-12-12
Classification: B08B,B24B,H01L,Y10S

Abstract:
A cleaning equipment, comprising:a cleaning bath for storing therein a cleaning solution and for allowing an object to be treated, into said cleaning solution to clean the surface of said object;a cleaning solution supply pipe for connecting said cleaning bath to a pure water supply source;a chemical storing container for storing therein a chemical;a chemical supply pipe for connecting said cleaning solution supply pipe to said chemical storing container;shut-off means for selectively opening and closing said chemical supply pipe;chemical supply means for supplying said chemical from saidchemical storing container to pure water flowing through said cleaning solution supply pipe;chemical concentration control means for controlling the concentration of said chemical in said cleaning solution; andtemperature detecting means for detecting the temperature of said cleaning solution in said cleaning bath, and wherein said chemical concentration control means has a control part which stores a temperature information previously given and forms a compared signal between a detection signal outputted from said temperature detecting means and the temperature information previously given, and wherein said chemical concentration control means controls the concentration of said chemical in said cleaning solution flowing on the basis of the compared signal.