Patent ID: 6229611
Filing Date: 2001-05-08
Classification: G01N,H01L

Abstract:
A method of detecting a transparent quartz wafer in a semiconductor equipment, the semiconductor equipment being used to perform a specific manufacturing process over semiconductor silicon wafers and comprising a light source and an optic sensor for detecting the light transmitted from the light source, wherein when the semiconductor silicon wafer is moved to a predetermined position in the semiconductor equipment, the semiconductor silicon wafer will block the light transmitted from the light source to the optic sensor and then the semiconductor equipment will be switched on to perform the specific manufacturing process when the optic detector detects that the light from the light source is blocked; the method comprising:forming at least one thin film layer at a bottom side of a quartz wafer over which the thin film layer can absorb at least a portion of the light transmitted from the light source; andmoving the quartz wafer to the predetermined position in the semiconductor equipment wherein the thin film layer at the bottom side of the quartz wafer will absorb the light transmitted from the light source to the optic sensor so as to make the optic sensor to detect the existence of the quartz wafer and then the semiconductor equipment will be switched on to perform the specific manufacturing process.