US Patent 7834899 Laser marking system

A laser marking system comprises means for transmitting the laser-emitted light onto one or a plurality of points on a substrate, with means for displacing the substrate and laser light emitting source relative to one another, wherein the substrate is selected to be sufficiently sensitive to the emitted light so that a reaction occurs at either said point or plurality of points which marks the substrate and characterised by the feature that the laser light emitting source comprises an array of lasers.