Patent ID: 9685378
Date: 2017-06-20
CPC Classifications: B23K,H01L

Claim:
1. A method of dividing rectangular plate-shaped workpieces into individual device chips, each of the plate-shaped workpieces having a plurality of devices formed in areas demarcated by projected dicing lines and arranged in at least one array, the method comprising: a plate-shaped workpiece sticking step of sticking an adhesive tape to an annular frame having an opening and sticking the rectangular plate-shaped workpieces to a surface of the adhesive tape in such a pattern that the plate-shaped workpieces have shorter sides spaced from each other by predetermined distances in aligned arrays within the opening; a detecting step, after performing the plate-shaped workpiece sticking step, of holding the annular frame to which the plurality of rectangular plate-shaped workpieces are stuck on a chuck table of a laser processing apparatus and detecting positions and angles of the projected dicing lines on each of the plate-shaped workpieces, with detecting means; and a dividing step, after performing the detecting step, of applying a laser beam having a wavelength which is absorbable by the plate-shaped workpieces from laser beam applying means to the plate-shaped workpieces while the chuck table and the laser beam applying means are being relatively processing-fed and finely adjusted for each of the plate-shaped workpieces on the basis of the positions and angles detected in the detecting step, thereby dividing the plate-shaped workpieces into a plurality of device chips along the projected dicing lines.