Laser engraved verification hologram and associated methods

• US 5,331,443 A
• Filed: 07/31/1992
• Issued: 07/19/1994
• Est. Priority Date: 07/31/1992
• Status: Expired due to Term

• Current Assignee: Crown Roll Leaf, Inc.
• Original Assignee: Crown Roll Leaf, Inc.
• Inventors: Stanisci, Joseph J.
• Primary Examiner(s): Look, Edward K.
• Assistant Examiner(s): LOPEZ, FRANK D
• Application Number:
  US07/923,834
• Time in Patent Office: 718 Days
• Field of Search: 359/2, 359/3, 359/8, 359/35, 283/86, 283/904, 356/71
• US Class Current: 359/2
• CPC Class Codes: B42D 25/328 Diffraction gratings; Holograms
• CPC Class Codes: B42D 25/43 by removal of material
• CPC Class Codes: G03H 1/0011 for security or authentication holograms on information-bearing cards B42D25/328; testing papers with holograms G07D7/0032
• CPC Class Codes: G03H 1/0236 Form or shape of the hologram when not registered to the substrate, e.g. trimming the hologram to alphanumerical shape substrates bearing a hologram G03H1/0272
• CPC Class Codes: G03H 1/0244 Surface relief holograms replicating hologram without interference recording G03H1/0276
• CPC Class Codes: G03H 1/028 by embossing
• CPC Class Codes: G03H 1/18 Particular processing of hologram record carriers, e.g. for obtaining blazed holograms photographic processing in general G03C, G03D
• CPC Class Codes: G03H 2001/184 Partially erasing
• CPC Class Codes: G03H 2001/187 Trimming process, i.e. macroscopically patterning the hologram
• CPC Class Codes: G03H 2001/188 Demetallisation, i.e. removing the enhancing metallic layer
• CPC Class Codes: G03H 2210/54 For individualisation of product
• CPC Class Codes: G03H 2260/62 Direct etching

Abstract

A method for increasing the authentication effect of a verification hologram to be affixed to a protected document includes laser etching individualized indicia into the reflective layer of each hologram produced en masse on a moving, continuous web. The laser is finely focused and guided by a computer which records the data used to form the selected indicia, such data being referenced for comparison to provide verification of authenticity upon presentation by a bearer. In one embodiment, the data used to create the indicia is generated by a computer program which may include a random number generator.

Claims

1. A method for increasing the authenticating effect of a hologram for affixation to a document comprises the steps of:

(a) forming said hologram, said hologram having an embossable layer, a reflective layer deposited over said embossable layer and a carrier layer; and

(b) selectively etching indicia into said hologram with a computer guided laser beam, said step of etching including removal of said reflective layer, said indicia being engraved through each of said embossable layer, said reflective layer and said carrier layer.

2. The method of claim 1, wherein said carrier layer and said embossable layer are separable and further including the steps of separating said carrier layer from said embossable layer and comparing said indicia engraved in said carrier layer with said indicia engraved in said embossable layer and said reflective layer to verify similarity upon presentation of said hologram.

3. The method of claim 1, wherein said reflective layer is Aluminum which is vaporized by said laser during said step of engraving.

4. The method of claim 1, wherein said indicia is at least partially in the form of alphanumeric characters.

5. The method of claim 4, wherein said characters are selected from standard fonts.

6. The method of claim 4, wherein at least a portion of said characters is variable over a range and the composition of said characters is determined during step of etching.

7. The method of claim 6, wherein the composition of said variable portion is determined by a computer program.

8. The method of claim 7, wherein said data representative of said indicia and said character composition is recorded during said step of etching.

9. The method of claim 8, wherein said computer program includes a random number generator which serves as a determinant in said character composition.

10. The method of claim 1, wherein a plurality of said holograms are arranged on a continuous web and further including the steps of moving said web during said step of engraving.

11. The method of claim 1, further including the step of recording data representative of said indicia.

12. The method of claim 11, wherein said recorded data is compared to said hologram upon presentation of said hologram to verify similarity.

13. The method of claim 12, wherein said comparison is visual.

14. The method of claim 13, wherein said comparison is made by superimposing an image generated from said recorded data upon said hologram presented for verification.

15. The method of claim 13, wherein said comparison is made by simultaneously viewing an image generated from said recorded data and said hologram presented for verification.

16. The method of claim 12, wherein said indicia is digitized for comparison to said recorded data, said recorded data being in digital form.

17. The method of claim 16, wherein at least a portion of said indicia is a variable bit pattern generated by a computer program.

18. The method of claim 11, wherein at least a portion of said indicia is machine readable via a scanning device and translates to alphanumeric characters.

19. The method of claim 18, wherein said machine readable portion is a bar code.

20. The method of claim 1, wherein at least a portion of said indicia corresponds to handwriting.

21. The method of claim 20 wherein said step of etching said indicia includes handwriting upon a digitizer pad to form an input to a computer controller.

22. The method of claim 1, wherein said hologram is affixed to a substrate which is at least partially light transmissive.

23. The method of claim 1, wherein said hologram is affixed to a substrate which is opaque.

24. A hologram comprises:

(a) an embossable layer having a microtextured surface; and

(b) a light reflective layer deposited over said microtextured surface, said reflective layer and said embossable layer having indicia laser engraved therein.

25. The hologram of claim 24, wherein at least a portion of said indicia is alphanumeric characters.

26. The hologram of claim 25, wherein said indicia is in the form of handwriting.

27. The hologram of claim 25, wherein said alphanumeric characters are selected from available standard fonts.

28. The hologram of claim 25, wherein said alphanumeric characters are at least partially generated by a computer program.

29. The hologram of claim 24, wherein said hologram is affixed to an opaque substrate.

30. The hologram of claim 29, wherein said substrate is visible through said indicia.

31. The hologram of claim 24, wherein said hologram is affixed to a substrate which is at least partially light transmissive.

32. The hologram of claim 31, wherein light transmitted through said substrate is visible through said indicia.

33. The hologram of claim 24, wherein said indicia is readable by an optical scanner.

34. The hologram of claim 33, wherein said indicia is a bar code.

35. The hologram of claim 24, wherein said hologram includes a carrier sheet upon which said embossable layer is disposed, said carrier sheet being engraved.

36. The hologram of claim 35, wherein said carrier sheet is separable from said embossable layer.