Patent ID: 6612316
Filing Date: 2003-09-02
Classification: B08B,H01L,Y10S

Abstract:
A wet processing device comprising:a chemical processing tank to store chemicals for processing the surface of the wafer, a wafer conveyor to carry said wafer in and out of the interior of said chemical processing tank, sensor means to determine the amount of air bubbles occurring within the chemical when present within said chemical processing tank and issue a first and a second control signal, and a wash tank to store water for washing said wafer carried out from said chemical processing tank by said wafer conveyor, wherein the first control signal issued by the sensor means to control a pull-up speed of said wafer conveyor device pulling said wafer up from said chemical processing tank, wherein the second control signal issued by the sensor means to control an amount of water supplied to said wash tank, and wherein said sensor means comprises a non-contact fluid level sensor installed by sealing material on an upper part of a cylinder having an opening in the bottom, a reference fluid level to match the overflow level of said chemical tank is formed in said cylinder, and air bubbles in said chemical flow into a sealed space within said cylinder, and the amount of air bubbles is detected by the height of the fluid level.