Patent ID: 9039867
Filing Date: 2015-05-26
Classification: H01L,Y10S,Y10T

Abstract:
1. A method for detaching a semiconductor chip from a foil by means of a chip gripper and a die ejector, wherein the die ejector comprises a first plurality plates having a straight supporting edge and a second plurality of plates having an L-shaped supporting edge, a first set of two of the second plurality of plates are arranged to form a first pair of outermost plates, the first plurality of plates and the second plurality of plates protruding into a central hole of a cover plate, and wherein the supporting edges of the first plurality of plates and the second plurality of plates in an initial position form a supporting plane on which the foil rests, the method comprising the following steps: A) lifting all of the first plurality of plates and the second plurality of plates, so that the supporting edges of the first plurality of plates and the second plurality of plates assume a height H B) lowering the first pair of outermost plates leaving a first group of plates raised; C) lifting the first group of plates, so that the supporting edges of the first group of plates assume a height H D) lowering some but not all of the first group of plates in a predetermined sequence leaving a last group of at least three plates from the first group of plates; E) positioning the chip gripper above the semiconductor chip; F) lowering the chip gripper into contact with the semiconductor chip before the lowering of the last group of at least three plates; and G) lowering the last group of at least three plates until all of the last group of at least three plates are lowered, wherein steps A to D are executed in the order listed above and before steps F and G.