Patent ID: 8810270
Filing Date: 2014-08-19
Classification: G01R

Abstract:
1. A wafer probe station including a chuck where a wafer is mounted, a chuck transporting unit which supports and transports the chuck, and a probe card for testing a wafer, comprising: a plurality of the pressure sensors which are disposed under portions of the chuck transporting unit for supporting the chuck in a vertical direction; a tilt correction unit which is constructed with a plurality of actuators which are disposed under the portions for supporting the chuck in the vertical direction, a plurality of displacement sensors which are disposed at positions adjacent to the corresponding actuators, and a microcomputer which controls operations of the actuators and the displacement sensors; and a control unit which allows the wafer to be come in contact with the probe card by lifting up a Z-axis stage by a predetermined overdriving amount, detects pressure values of the installation positions from the pressure sensors, calculates driving amounts of the actuators of the tilt correction unit by using the pressure values so that a uniform load is applied to the chuck, lifts down the Z-axis stage, and after that, corrects an eccentric load of the chuck by driving the actuators of the tilt correction unit according to the driving amounts.