Patent ID: 6871394

Claim:
A method of ensuring proper contact between a plurality of substrates and a lifting device with a plurality of vacuum pads in a semiconductor packaging process wherein the substrates are placed, one each, in depressions in a substrate tray, each depression having a hole, the method comprising the steps of: providing a substrate tray having depressions therein with a substrate in each said depression, each depression having a hole; providing and raising a plate with a plurality of protrusions each protrusion extending through a different said hole and maintaining level or leveling the substrate in the corresponding depression while lifting said substrate concurrently with the other of the plurality of substrates in the other of said depressions; providing and then lowering the lifting device having vacuum pads onto the tray; stopping the lifting device when the vacuum pads from the lifting device comes into contact with the substrates; and applying a vacuum at the vacuum pads to temporarily attach the substrates to the vacuum pads.