Patent ID: 7064046

Claim:
A method of manufacturing a semiconductor device, comprising: providing a wafer comprising a predetermined dicing line region and a pair of pads that are formed on a front surface of the wafer so that part of each of the pads is disposed in the dicing line region; attaching a first substrate to the front surface of the wafer; attaching a second substrate to a back surface of the wafer; forming a cut groove from a surface of the second substrate by moving a blade along the dicing line region so as to expose an end portion of each of the pads in the cut groove; irradiating the cut groove with detection light; measuring a width of the cut groove by detecting light reflected from opposing upper end portions of the cut groove; measuring a distance between the two pads by detecting light reflected from the exposed end portions of the two pads; and aligning the blade based on a result of the measuring of the width, the distance or both the width and the distance so that a center line of the cut groove is located at a center line of the predetermined dicing line region and that a depth of the cut groove is a predetermined depth.