Patent ID: 8143552

Claim:
A laser beam machining system comprising a chuck table for holding a work, the work having a substrate and a plurality of electrodes on a first side of the substrate, and laser beam irradiation means for irradiating said work held on said chuck table with a laser beam, the laser beam penetrating the substrate on a second side opposed to the first side, wherein said laser beam irradiation means includes: a pulsed laser beam oscillator for oscillating a pulsed laser beam; a condenser for condensing said pulsed laser beam oscillated from said pulsed laser beam oscillator; laser beam scanning means disposed between said pulsed laser beam oscillator and said condenser and operative to deflect said pulsed laser beam to be inputted to said condenser, said laser beam scanning means deflecting a condensation point of the pulsed laser beam to track a hole location on the substrate while the substrate is moving; and laser beam reshaping means which is disposed between said pulsed laser beam oscillator and said laser beam scanning means and by which an energy distribution of said pulsed laser beam oscillated from said pulsed laser beam oscillator is reshaped into a top hat shape so that a laser beam machined hole having a uniform depth can be formed in the substrate, without boring a hole in the electrodes.