Patent ID: 9568501
Date: 2017-02-14
CPC Classifications: G01R

Claim:
1. A probe card attaching method of respectively attaching probe cards to multiple testers by a transfer stage in a wafer inspection apparatus, including the multiple testers and the transfer stage that transfers a wafer as an inspection target to each of the testers, in which the probe cards each having probes to be contacted with the wafer are attached to the testers, the probe card attaching method comprising: providing a first camera configured to face the tester in the transfer stage; providing a second camera configured to face the transfer stage in the tester; determining a reference position where the first camera and the second camera are aligned with each other by moving the transfer stage; determining a position of a probe card attaching unit provided in the tester by checking a first mark provided in the tester with the first camera; determining a position of the probe card by checking a second mark provided in the probe card mounted on the transfer stage with the second camera; allowing the probe card to be aligned with the probe card attaching unit by moving the transfer stage based on the determined reference position, position of the probe card attaching unit and position of the probe card; and attaching the probe card to the probe card attaching unit by moving the transfer stage toward the probe card attaching unit, wherein a first distance from the reference position to a center of the probe card attaching unit is determined by checking the first mark with the first camera, a second distance from the reference position to a center of the probe card is determined by checking the second mark with the second camera, and the center of the probe card is aligned with the center of the probe card attaching unit by moving the transfer stage based on the first distance and the second distance, after the second distance is determined.