Patent ID: 8452563
Filing Date: 2013-05-28
Classification: G01R,G05B

Abstract:
1. An error measurement and correction device for measuring and correcting movement errors of a stage of a wafer prober, comprising: a jig member having a surface on which patterns having the same shape are repeatedly formed; a vision module having a base substrate and one or more cameras mounted on the base substrate; and a central processing unit acquiring one or more images of the patterns of the jig member by using the vision module, generating mapping data between a target movement distance and an actual movement distance of the stage by using the one or more images of the patterns received from the vision module and, and when the stage is to be moved, correcting a position to which the stage is to be moved by using the mapping data and providing the corrected position to a control encoder of the stage, wherein the jig member is disposed on a chuck on the stage, wherein the vision module is disposed on an upper plate of the wafer prober disposed at a position facing the chuck to enable the camera of the vision module to pick up images of the patterns of the jig member on the chuck and transmits the picked images to the central processing unit, and wherein the central processing unit acquires a first image of the jig member disposed on the chuck from the vision module to obtain reference position information based on the first image, moves the stage by a unit length of a pattern of the jig member and then acquires a second image of the jig member to obtain moved position information based on the second image, generates the mapping data by calculating a difference between the reference position information and the moved position information, and stores the generated mapping data in a data storage unit.