Patent ID: 6086453
Filing Date: 2000-07-11
Classification: G01N

Abstract:
A wafer pattern imaging apparatus for imaging patterns on an obverse of a wafer, the wafer pattern imaging apparatus comprising:an illuminator that emits light to the wafer, the light being transmitted through portions of the wafer where the patterns are not located; andan imaging system that images the patterns on the obverse of the wafer by the light emitted from the illuminator and transmitted through the wafer; wherein:the wafer is placed with the obverse thereof down on a surface of a wafer table;the imaging system and the illuminator are disposed above a reverse of the wafer;a reflection surface that reflects the light emitted from the illuminator and transmitted through the wafer to the imaging system is provided below the surface of the wafer table; andthe imaging system images an image formed by the light reflected by the reflection surface.