Method for the production of a security feature, security feature for a data medium, data medium, and lamination sheet

1 . A method for producing a security feature for a data medium, comprising the steps of:

providing a substrate of plastic material which is transparent or partially transparent in the visible spectral range;

providing a molding means which has a molding structure and forms an image presentation of a representation which together with a light-diffractive or light-refractive structure generates an optically variable image;

introducing the representation into one side of the substrate by impressing the molding structure;

forming a light-diffractive or light-refractive structure on the opposite side of the substrate; and

introducing a superimposed security element into the substrate with a laser by changing the substrate material locally in terms of color;

wherein the introduction of the superimposed security element takes place through the light-diffractive or light-refractive structure;

wherein the superimposed security element is optically variable when viewed through the light-diffractive or light-refracting structure.

2 . The method as claimed in claim 1 , wherein the molding means is a lamination sheet and the representation is introduced during lamination of the substrate.

3 . The method as claimed in claim 2 , wherein the light-diffractive or light-refractive structure is disposed on the substrate during lamination by means of a second lamination sheet and the steps of introducing the representation into one side of the substrate by impressing the molding structure and forming a light-diffractive or light-refractive structure on the opposite side of the substrate are carried out in a common laminating process.

4 . The method as claimed in claim 1 , wherein the substrate has at least one laser-sensitive layer and the superimposed security element is formed in this layer.

5 . The method as claimed in claim 1 , wherein the introduction of the superimposed security element takes place after the production of the first security feature.

6 . The method as claimed in claim 1 , wherein the molding structure is introduced into the molding means with a laser cutting, milling, water jet cutting or a galvanic method.

7 . The method as claimed in claim 1 , wherein elements of the molding structure are calculated such that the representation is a moving representation when the security feature is tilted.

8 . The method as claimed in claim 1 , wherein the molding means is a stamp and in that the representation is introduced after lamination of the substrate.

9 . A data medium, including a value document or a chip card, comprising a carrier on or in which a security feature as claimed in claim 1 is arranged.

10 . A data medium, including a value document or a chip card, comprising a carrier on or in which a security feature as claimed in claim 1 is arranged, further comprising the superimposed security element.

11 . A lamination sheet for the production of a security feature as claimed in claim 1 for a data medium, having a molding structure which is an image presentation of a representation which together with a light-diffractive or light-refractive structure generates an optically variable image.

12 . The lamination sheet as claimed in claim 11 , wherein the molding structure is introduced into the molding means with a laser cutting, milling, water jet cutting or a galvanic method.

13 . The method as claimed in claim 1 , wherein the local color change is effected by generating black or dark surface elements in the substrate.

14 . A security feature for a data medium, the security feature comprising:

a substrate which is transparent or partially transparent in the visible spectral range and in which a representation has been molded on one side of the substrate and a light-diffractive or light-refractive structure is formed on an opposing side of the substrate,

wherein the representation together with the light-diffractive or light-refractive structure generates an optically variable image,

wherein the light-diffractive or light-refractive structure at least partially covers the representation and interacts with the representation in order to generate a moving representation when the security feature is tilted, and

wherein the security feature further include a superimposed security element having locally changed substrate material,

wherein the superimposed security element is optically variable when viewed through the light-diffractive or light-refracting structure.

15 . The security feature of claim 14 , wherein the representation is viewable from both sides of the substrate.