Security feature and method for manufacturing the same
View Patent ↗A method for manufacturing a security feature for a security element, a security paper or a data carrier that exhibits a substrate into which at least one through opening and at least one marking in registration with the through opening are to be introduced. The method includes the steps of providing a substrate with a laser-modifiable marking substance at least in the region of the marking to be produced and, in the same operation, introducing at least one through opening into the substrate by the action of laser radiation at higher laser power and modifying the laser-modifiable marking substance in the marking region by the action of laser radiation at a lower laser power to produce at least one marking in registration with the through opening.
1. A method for manufacturing a security feature, for a security element, a security paper or a data carrier, that exhibits a substrate into which at least one through opening and at least one marking in registration with the through opening are to be introduced, the method comprising:
a) providing a substrate with a laser-modifiable marking substance at least in the region of the marking to be produced, and
b) in the same operation
b1) introducing at least one through opening into the substrate by the action of laser radiation at higher laser power, and
b2) modifying the laser-modifiable marking substance in the marking region by the action of laser radiation at lower laser power whereby a plurality of markings in the marking region surrounding the through opening and in registration with the through opening are produced.
2. The method according to claim 1 , wherein at least one through opening and at least one registered marking are produced transitioning into one another without spacing.
3. The method according to claim 1 , wherein at least one through opening and at least one registered marking are produced spaced apart.
4. The method according to claim 1 , wherein the substrate is kept free from laser-modifiable marking substance in the region of the through openings.
5. The method according to claim 1 , wherein the substrate is provided with laser-modifiable marking substance also in the region of the through openings such that the laser-modifiable marking substance is modified in the vicinity of the openings by the same laser beam when introducing the through openings.
6. The method according to claim 5 , wherein the laser-modifiable marking substance is modified by the action of laser radiation in an edge region of the openings that immediately adjoins the openings to be produced.
7. The method according to claim 1 , wherein the substrate is coated with the laser-modifiable marking substance.
8. The method according to claim 1 , wherein the laser-modifiable marking substance is introduced into the volume of the substrate.
9. The method according to claim 1 , wherein the substrate is formed from paper.
10. The method according to claim 9 , wherein the laser-modifiable marking substance is added to the paper pulp at sheet formation.
11. The method according to claim 9 , wherein the laser-modifiable marking substance is introduced into the volume of the substrate in an immersion bath.
12. The method according to claim 9 , wherein the substrate is impregnated with the laser-modifiable marking substance in a size press.
13. The method according to claim 1 , wherein the substrate is formed from a plastic foil.
14. The method according to claim 1 , wherein the laser-modifiable marking substance has a visible color that is changed by the action of the laser radiation.
15. The method according to claim 1 , wherein the laser-modifiable marking substance has infrared-absorbing, magnetic, electrical or luminescent properties that are changed by the action of the laser radiation.
16. The method according to claim 1 , wherein the through openings are produced in the form of perforations, cuts or expansive window regions.
17. The method according to claim 1 , wherein laser-modifiable effect pigments are used as the laser-modifiable marking substance.
18. The method according to claim 1 , wherein a pigment-free laser-modifiable marking substance is used.
19. The method according to claim 1 , wherein laser radiation in the ultraviolet or visible spectral range is used to introduce the openings and to modify the laser-modifiable marking substance.
20. The method according to claim 1 , wherein laser radiation in the infrared spectral range, especially laser radiation of a CO 2 laser at a wavelength of about 10.6 μm, is used to introduce the openings and to modify the laser-modifiable marking substance.
21. The method according to claim 1 , wherein the security element, the security paper, or the data carrier is used to secure at least one object.