Patent ID: 6442974
Filing Date: 2002-09-03
Classification: B32B,B41M,C03C

Abstract:
A method for making markings, that are visually observable with bare eyes, on a surface of a material (5) by using a laser beam (2), in which methoda) the material to be marked does not essentially absorb energy of a laser light of a wavelength of said laser beam; and b) the laser beam (2) is focused, through the material to be marked (4, 5), onto a surface of a vehicle (1) on opposite side material, wherein c) the laser beam (2) causes a reaction in the vehicle, comprising heating, melting and vaporization of the vehicle as well as penetration of detached vehicle atoms and molecules into the material (5) to be marked without damaging said material, such that the vehicle atoms are transferred to said material, resulting in a visually distinguishable mark on it, and d) the marking according to the method is effected essentially at a normal pressure, with a gap of essentially 0.1 mm between the vehicle and the material to be marked.