Patent ID: 8226796

Claim:
A method for picking up a die mounted on an adhesive surface, the method comprising the steps of: positioning a collet over the die to be picked up from a wafer tray, the collet comprising: a vacuum channel configured to apply a vacuum suction force; a flat platform at an end of the collet, the flat platform having a single opening, the single opening being connected to the vacuum channel, and the single opening being configured to apply the vacuum suction force onto a planar surface of the die to hold the die during pick-up of the die from the wafer tray; and a single flange protruding from one side of the platform and configured to push against a side of the die which is substantially perpendicular to the planar surface of the die during the pick-up of the die from the wafer tray, wherein the platform has a flat surface extending between the single opening and the single flange; pushing the side of the die with the flange in a first direction such that the die is biased to move in the first direction by the flange; generating a vacuum suction force on the planar surface of the die to hold the planar surface of the die against the platform; and thereafter picking up the die with the collet along a second direction which is substantially perpendicular to the first direction, wherein the platform forms a gap with the planar surface of the die when the flange is pushing the side of the die.