Patent ID: 6873396

Claim:
A photolithography processing system, comprising: a table positioned near a loader, where a carrier is positioned, for supporting a wafer that is being transported by a robot; a plurality of illumination tools for illuminating a surface of the wafer positioned on the table, the plurality of illumination tools including: a plurality of first illumination tools positioned laterally at different heights to illuminate the surface of the wafer at various predetermined angles of incidence; and a second illumination tool to illuminate the surface of the wafer vertically from above the wafer on the table; a camera for taking pictures of the surface of the wafer; and a controller for controlling operations of the robot, the plurality of illumination tools and the camera and for detecting the presence of impure matters on the surface of the wafer, the controller including: elevating means to slide up or down the first illumination tools in response to an applied illumination control signal; and a luminous intensity unit to control luminous intensity by varying a value of a resistance connected in series with the power source that is connected to the first and second illumination tools in response to other applied illumination control signals.