Method of marking or inscribing a workpiece
AssigneeTesa SE
InventorsArne Koops, Sven Reiter
Life of this patent
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Abstract
The present invention provides a method of marking or inscribing a workpiece (3) with high-energy radiation, more particularly with a laser beam (1), the workpiece (3) being transparent for the radiation wavelength, and a polymer matrix (7) being disposed in the vicinity of the workpiece (3) in such a way that the radiation passes through the workpiece (3) before it impinges on the polymer matrix (7), characterized in that disposed between the polymer matrix (7) and the workpiece (3) is a film (15) of liquid which is in contact with the polymer matrix (7) and with the workpiece (3).
Claims7
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.
Dependencies are inferred from the claim text.