Patent ID: 6421456
Filing Date: 2002-07-16
Classification: B28D,H01L

Abstract:
A method of sawing semiconductor wafers, comprising:(A) preparing a semiconductor wafer comprising a plurality of semiconductor chips, a plurality of scribe lines including horizontal scribe lines and vertical scribe lines, and a plurality of recognition marks formed on crossing points where horizontal and vertical scribe lines intersect; (B) loading the semiconductor wafer on a wafer sawing apparatus having a saw blade; (C) aligning the scribe lines of the semiconductor wafer under the saw blade by recognizing the recognition marks; (D) sawing the semiconductor wafer along the scribe lines to cut the wafer into individual semiconductor chips; (E) recognizing one of the recognition marks as a reference mark; (F) determining whether the scribe lines of the wafer are aligned by determining positions for a plurality of recognition marks relative to the reference mark, wherein step (F) comprises: (F1) successively recognizing recognition marks at first, second, and third spots along a vertical scribe line on which the reference recognition mark is formed; (F2) successively recognizing recognition marks at fourth, fifth, sixth, and seventh spots along a horizontal scribe line on which the third spot is formed; and (F3) successively recognizing recognition marks at eighth and ninth spots along a vertical scribe line on which the seventh spot is formed, wherein the ninth spot of step (F3) is on the same horizontal scribe line as the reference recognition mark.