Patent ID: 9121901
Filing Date: 2015-09-01
Classification: G01R,H01L

Abstract:
1. A semiconductor wafer test apparatus, comprising: a plurality of test heads to which probe cards are electrically connected; a wafer tray which is able to hold a semiconductor wafer; an alignment device which positions the semiconductor wafer held on the wafer tray relatively with respect to the probe card so as to make the wafer tray face the probe card; a top plate on which a plurality of mounting holes are formed, and the probe cards being mounted in the mounting holes; and a pulling device which pulls the wafer tray facing the probe card toward the probe card, wherein the alignment device has: the pulling device has: the wafer tray has projecting parts which stick out in a diametrical direction such that a free end of each of the projecting parts is defined at a first diameter that is larger than a second diameter at which the fixed end of each of the projecting parts is fixed to the wafer tray, a passage hole which has recessed parts corresponding to the projecting parts and through which the wafer tray is capable of passing is formed on the holder, and the wafer tray rotates relative to the holder such that the holder holds the wafer tray.