Patent ID: 7975996
Filing Date: 2011-07-12
Classification: G01N,H01L

Abstract:
1. A scan stage for a semiconductor wafer pollutant measurement apparatus, the scan stage comprising: a stage main body which comprises: a circular fixed housing; an adsorption plate which is rotatably installed in the inside of the fixed housing, at the center of which an adsorption path is formed, at the bottom of which a vacuum port is connected, and which is rotated by an external rotating force; and a step motor which is placed at the bottom of the fixed housing and connected with the adsorption plate; a base plate that is supported by pillars to form a lower space between the fixed housing of the stage main body and the base plate; a cylinder is connected with a cylinder load which is formed at the bottom of the base plate so that the base plate moves up and down; and support jigs that hold up wafers in the outer side of the stage main body, respectively.