Patent ID: 6106222
Filing Date: 2000-08-22
Classification: H01L,H05K,Y10T

Abstract:
A method of peeling a plurality of chips of a wafer off a flexible sheet attached to a reverse side of said wafer, said method comprising the steps of:placing a wafer retainer plate that holds said wafer with said plurality of chips on a plurality of first protrusions and second protrusions that are integrally formed with a peeling plate and that have different heights, wherein the difference in height between said first and second protrusions is equal to or smaller than the thickness of said flexible sheet and further wherein said peeling plate has suction holes between said first protrusions and said second protrusions positioned next to said first protrusions,drawing said flexible sheet under a vacuum through said suction holes thereby to curve said flexible sheet due to the different heights of the first protrusions and the second protrusions, said drawing thereby peeling the chips off said flexible sheet; andattracting and carrying the chips peeled off said flexible sheet.