Patent ID: 7776720
Filing Date: 2010-08-17
Classification: B23K,H01L

Abstract:
1. A method, using a pulsed laser, of program-controlled dicing of a substrate, the method comprising the steps of: a. providing a programmable laser controller and an associated memory for controlling a pulsed laser that generates a laser beam propagating through a telecentric scan lens for scanning the laser beam across a substrate having at least one layer; b. providing in the associated memory a laser cutting strategy file of a plurality of combinations of pulse rate, pulse energy and pulse spatial overlap of pulses produced by the pulsed laser at the substrate to restrict damage to the at least one layer while maximising machining rate for the at least one layer; c. providing in the laser cutting strategy file data representative of a selected plurality of scans of the at least one layer by the pulsed laser necessary to cut through the at least one layer when the pulsed laser is operating according to a selected combination of pulse rate, pulse energy, and pulse spatial overlap of pulses stored in the laser cutting strategy file, the providing of a laser cutting strategy file comprising the steps of, d. using the pulsed laser under control of the programmable laser controller driven by the laser cutting strategy file to scan the at least one layer with the selected plurality of scans at least to facilitate dicing of the substrate such that a resultant die has at least a predetermined die strength and a yield of operational die equals at least a predetermined minimum yield.