Patent ID: 8575511
Filing Date: 2013-11-05
Classification: B41M,C03C,C23C

Abstract:
1. A method of permanently applying a mark on a workpiece by marking or inscribing the workpiece comprising the steps of: providing high-energy radiation with a laser beam having a radiation wavelength, providing the workpiece which is transparent for the radiation wavelength, disposing a polymer matrix in the vicinity of the workpiece, the polymer matrix being separated from the workpiece by a gap in such a way that the radiation passes through the workpiece without absorbing any radiation before impinging on the polymer matrix, causing pulverization of the polymer matrix and forming reactants, the reactants being deposited in the form of markings on the surface of the workpiece, wherein, the gap is filled with a film of liquid which is in contact with the polymer matrix and with the workpiece, and wherein the film of liquid and the workpiece have refractive indices which differ by less than 0.5.