Magnetic metallic safeguarding thread with negative writing

• US 5,354,099 A
• Filed: 09/30/1992
• Issued: 10/11/1994
• Est. Priority Date: 12/20/1990
• Status: Expired due to Term

• Current Assignee: GAO Gesellschaft Fur Automation und Organisation mbH
• Original Assignee: GAO Gesellschaft Fur Automation und Organisation mbH
• Inventors: Kaule, Wittich, Boehm, Michael
• Primary Examiner(s): Eley, Timothy V.
• Assistant Examiner(s): NGUYEN, KHAN
• Application Number:
  US07/920,574
• Time in Patent Office: 741 Days
• Field of Search: 283/57, 283/58, 283/72, 283/82, 283/83, 283/85, 283/91, 160/140, 428/208, 428/209, 428/915, 428/916, 427/131, 427/282, 427/286, 427/376.6, 427/383.1, 427/511, 427/555, 427/548
• US Class Current: 283/85
• CPC Class Codes: B42D 25/355 Security threads
• CPC Class Codes: Y10S 283/901 Concealed data
• CPC Class Codes: Y10S 428/915 Fraud or tamper detecting

Abstract

The invention relates to a security document, in particular a bank note, identity card or the like having a security element which is provided with characters, patterns, etc., visually readable at least in transmitted light and which is electrically conductive and bears additional substances for machine testing, and to a method for producing such a security element. The security element comprises a transparent film strip that bears negative writing readily capable of visual checking and is additionally provided with electrically conductive and magnetic substances.

Claims

1. A method for producing a security element to be incorporated into a security document and provided with indicia that are readily visible, both in transmitted light and in incident light, and machine testable, comprising the steps of:

providing one side of a transparent carrier film with a machine testable substance in mutually spaced regions with gaps between said spaced regions,

printing the carrier film in the gaps between the regions with an activatable ink in the form of the readable indicia,

providing the side of the carrier film bearing the activatable ink with a metallic layer over the entire carrier film,

then activating the activatable ink, giving rise to recesses in the form of the indicia in the metallic layer, and

cutting the film into strips of suitable width.

2. The method of claim 1, in which the metallic layer is a vacuum metallized layer, selected from a group consisting a bronze ink or an imitation metal ink.

3. The method of claim 1, which includes mixing the machine testable substance with an electrically conductive material prior to application to the transparent carrier film.

4. The method of claim 1, which includes mixing the machine testable substance with carbon black particles prior to application to the transparent carrier film.

5. The method of claim 1, in which the detachment of the layers over the carrier film is supported by ultrasonics, brushing, or rubbing.

6. The method of claim 1, in which the activatable ink is a wax bearing emulsion or contains formable additives.

7. The method of claim 6, in which the formable additives are present in the ink in the form of microcapsules.

8. The method of claim 1, which comprises activating the activatable ink by a laser beam, use of heat, an electron beam, a coolant, or by pressure.

9. The method of claim 1, which comprises providing a metallic layer between the carrier film and machine testable substance in exact register with the machine testable substance.

10. The method of claim 1, which comprises applying a protective transparent layer of lacquer prior to the last method step.

11. A method for producing a security document with a security element being provided with indicia that are visually readable at least in transmitted light and being machine testable, comprising the steps of:

printing a transparent carrier film with an activatable ink in the form of readable indicia,

applying a metallic layer over the entire carrier film,

activating the ink to produce recesses in the form of the indicia in the metallic layer,

applying a magnetic substance over partial areas of the carrier film, cutting the film into strips of suitable width, and

embedding at least one strip at least partially into a security paper during paper manufacture.

12. The method of claim 11, in which the indicia are printed in the form of parallel lines and columns.

13. The method of claim 11, in which the indicia are applied in parallel columns and shifted by half a line.

14. The method of claim 11, in which the magnetic substance is applied in bars parallel to the columns.

15. The method of claim 11, in which the magnetic substance is applied in stripes parallel to the lines.

16. The method of claim 11, in which the magnetic substance is mixed with electrically conductive material.

17. The method of claim 11, in which the magnetic substance is mixed with carbon black particles.

18. The method of claim 11, in which the activatable ink contains chemical solvents.

19. A method for producing a security document with a security element being provided with indicia that are visually readable at least in transmitted light and being machine testable, comprising the steps of:

printing a transparent carrier film with an activatable ink in the form of the indicia,

providing the side of the carrier film bearing the activatable ink with a machine testable substance over the entire carrier film,

applying a metallic layer over the entire machine testable substance,

then activating the activatable ink to remove portions of all layers on the carrier film giving rise to congruent recesses in the form of the indicia in the metallic layer and the machine testable substance,

cutting the film in strips of suitable width, and

embedding the strips at least partially into a security paper during paper manufacture.

20. The method of claim 19, in which the metallic layer is selected from a group consisting of a vacuum metallized layer, a bronze ink or an imitation metal ink.

21. The method of claim 19, which comprises mixing the machine testable substance with an electrically conductive material prior to application to the transparent carrier film.

22. The method of claim 19, which comprises mixing the machine testable substance with carbon black particles prior to application to the transparent carrier film.

23. The method of claim 19, in which the machine testable substance is a magnetic ink.

24. The method of claim 19, in which the activatable ink is selected from a group consisting of wax bearing emulsions or foamable additives.

25. The method of claim 24, in which the foamable additives are present in the ink in the form of microcapsules.

26. The method of claim 19, which comprises activating the activatable ink by a laser beam, use of heat, electron beam, a coolant or by pressure.

27. The method of claim 19, in which a further metallic layer is provided congruently underneath the magnetic substance and on top of the activatable ink.

28. The method of claim 19, which comprises applying a protective transparent layer of lacquer prior to the last method step.

29. A method for producing a security document with a security element being provided with indicia that are visually readable at least in transmitted light and being machine testable, comprising the steps of:

providing a transparent carrier film with a machine testable substance in mutually spaced regions with gaps between said spaced regions,

printing the carrier film in the gaps between the spaced regions with an activatable ink in the form of the readable indicia,

providing the side of the carrier film bearing the activatable ink with a metallic layer over the entire carrier film,

then activating the activatable ink, to remove portions of the layers on top of the activatable ink giving rise to recesses in the form of the indicia in the metallic layer,

cutting the film in strips of suitable width, and

embedding the strips at least partially into a security paper during paper manufacture.