Patent ID: 6330728
Filing Date: 2001-12-18
Classification: B08B,H01L

Abstract:
A brush scrubbing apparatus, comprising:a rotating turntable which retains a wafer;a brush which removes a particle on the wafer;driving means for driving the brush through the use of a driving current; anda controller which detects a reference position of said brush responding to a change of a first current value for driving the brush, the change being caused by the brush contacting the wafer, said controller further storing a predetermined distance to thrust said brush downward from the reference position, said controller also storing a second current value for driving the brush when the brush is moved downward toward the wafer until the predetermined distance to thrust said brush downward from the reference position is reached, said controller finding a differential value between the first and second current values and comparing the differential value and a predetermined threshold value;wherein the reference position is a position in which the brush contacts the wafer.