Transparent reflection-type

• US 4,856,857 A
• Filed: 09/26/1988
• Issued: 08/15/1989
• Est. Priority Date: 05/07/1985
• Status: Expired due to Term

• Current Assignee: Dai Nippon Printing Company Limited
• Original Assignee: Dai Nippon Printing Company Limited
• Inventors: Danjo, Koutaro, Yui, Yoshiharu, Takeuchi, Satoshi, Ikeda, Satoshi, Tahara, Shigehiko
• Primary Examiner(s): Arnold, Bruce Y.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/249,194
• Time in Patent Office: 323 Days
• Field of Search: 283/86, 283/72, 283/101, 283/904, 350/3.6, 350/3.61, 428/40, 428/343
• US Class Current: 359/3
• CPC Class Codes: B42D 2033/04 Transparent material
• CPC Class Codes: B42D 2033/10 Metallic material
• CPC Class Codes: B42D 2033/20 Coloured material; Pigments or inks
• CPC Class Codes: B42D 2033/30 Plastic material
• CPC Class Codes: B42D 2033/32 Other material
• CPC Class Codes: B42D 2035/06 Picture of the user
• CPC Class Codes: B42D 2035/08 Alphanumerical data
• CPC Class Codes: B42D 2035/16 Bars or lines
• CPC Class Codes: B42D 2035/34 Markings visible under particular conditions or containing coded information
• CPC Class Codes: B42D 25/324 Reliefs
• CPC Class Codes: B42D 25/328 Diffraction gratings; Holograms
• CPC Class Codes: B42D 25/351 Translucent or partly translucent parts, e.g. windows
• CPC Class Codes: B42D 25/36 comprising special materials
• CPC Class Codes: B42D 25/373 Metallic materials
• CPC Class Codes: B42D 25/415 using chemicals B42D25/445 takes precedence
• CPC Class Codes: B42D 25/42 by photographic processes
• CPC Class Codes: B42D 25/425 by deformation, e.g. embossing
• CPC Class Codes: B42D 25/455 using heat
• CPC Class Codes: B42D 25/46 using pressure
• CPC Class Codes: B42D 25/47 using adhesives
• CPC Class Codes: G03H 1/0244 : Surface relief holograms replicating hologram without interference recording G03H1/0276
• CPC Class Codes: G03H 1/0248 : Volume holograms
• CPC Class Codes: G03H 1/0252 : Laminate comprising a hologram layer
• CPC Class Codes: G03H 2250/10 : arranged to be transferred onto a carrier body adhesive layer G03H2250/35
• CPC Class Codes: G03H 2250/12 : Special arrangement of layers
• CPC Class Codes: G03H 2250/36 : Conform enhancement layer
• CPC Class Codes: G03H 2250/40 : Printed information overlapped with the hologram
• CPC Class Codes: G03H 2270/52 : Integrated surface relief hologram without forming layer
• CPC Class Codes: G06K 19/16 : the marking being a hologram or diffraction grating
• CPC Class Codes: Y10S 283/904 : Credit card

Abstract

A transparent-type hologram comprising a transparent hologram-forming layer and a holographic effect-enhancing layer comprising a thin transparent film, the holographic effect-enhancing layer being laminated on the hologram-forming portion of the transparent hologram-forming layer. The holographic effect-enhancing layer has a refractive index different from that of the transparent hologram-forming layer.

Claims

1. A transparent reflection-type hologram comprising:

a transparent hologram-forming layer including a relief-hologram forming surface, and

a holographic effect-enhancing layer comprising a thin transparent film,

said holographic effect-enhancing layer having a refractive index n₂ different from a refractive index n₁ of said transparent hologram-forming layer and being formed on the relief-hologram forming surface of the transparent hologram-forming layer, the difference between the refractive index n₁ and the refractive index n₂ being more than 0.2.

2. A transparent reflection-type hologram as claimed in claim 1, wherein n₂ -n₁ ≧

1.0.

3. A transparent reflection-type hologram as claimed in claim 1, wherein said holographic effect-enhancing layer comprises a thin metal film of a thickness notlaimed in claim exceeding 200 Å

.

4. A transparent reflection-type hologram as claimed in claim 1, wherein said holographic effect-enhancing layer is disposed on a part or parts of said transparent hologram-forming layer.

5. A transparent reflection-type hologram as claimed in claim 1, wherein a hologram is formed on at least a part of said transparent hologram-forming layer.

6. A transparent reflection-type hologram as claimed in claim 1, wherein a printed layer is formed on the surface of and/or inside said transparent hologram-forming layer and/or said holographic effect-enhancing layer.

7. A transparent reflection-type hologram as claimed in claim 1, wherein at least one of said transparent hologram-forming layer and holographic effect-enhancing layer is colored.

8. A transparent-type hologram as claimed in claim 1, wherein said holographic effect-enhancing layer is formed of a material selected from the groups consisting of (a) transparent ferroelectrics having a higher refractive index than the transparent hologram-forming layer;

(b) a thin transparent film having a lower refractive index than the transparent hologram-forming layer;

(c) a resin having a refractive index different from that of the transparent hologram-forming layer;

(d) a thin metal film of a thickness not exceeding 200 Å

; and

(e) a laminate structure formed by combined (a) through (d).

9. A transparent-type hologram as claimed in claim 1, wherein said holographic effect-enhancing layer comprises a thin film of a material selected from the group consisting of SiO, In₂ O₃, TiO, ThO₂, Si₂ O₃, PbF₂, Cd₂ O₃, La₂ O₃, MgO, Al₂ O₃, LaF₃, CaOSiO₂, CeF₃, NdF₃, SiO₂, SiO₃, ThF₄, Sb₂ S₃, Fe₂ O₃, PbO, ZnSe, CdS, Bi₂ O₃, TiO₂, PbCl₂, CeO₂, Ta₂ O₅, ZnS, ZnO, CdO, And₂ O₃, Sb₂ O₃, ZrO₂, WO₃, Pr₆ O₁₁, CdSe, CdTe, Ge, HfO₂, PbTe, Si, Te, TlCl, and ZnTe.

10. A transparent reflection-type hologram transfer sheet comprising, in order, a support, a transparent reflection-type hologram and an adhesive layer formed on one side of the support;

said transparent reflection-type hologram comprising a transparent hologram-forming layer including a relief-hologram forming surface, and a holographic effect-enhancing layer comprising a thin transparent film, said holographic effect-enhancing layer having having a refractive index n₂ different from a refractive index n₁ of said transparent hologram-forming layer and being formed on the relief-hologram forming surface of the transparent hologram-forming layer, the difference between the refractive index n₁ and the refractive index n₂ being more than 0.2.

11. A transfer sheet as claimed in claim 10, wherein said holographic effect-enhancing layer has a refractive index different from that of the transparent hologram-forming layer.

12. A transfer sheet as claimed in claim 10, wherein n₂ -n₁ ≧

1.0.

13. A transfer sheet as claimed in claim 10, wherein a releasing layer is disposed between said support and said transparent reflection-type hologram.

14. A transfer sheet as claimed in claim 13, wherein a protective layer is further disposed between said releasing layer and said transparent reflection-type hologram

15. A transfer sheet as claimed in claim 14, wherein a printed layer is formed between and/or on said layers.

16. A transfer sheet as claimed in claim 14, wherein at least one of said layers is colored.

17. A transfer sheet as claimed in claim 10, wherein a fragile layer is disposed between said transparent reflection-type hologram and said adhesive layer.

18. A transfer sheet as claimed in claim 10, wherein said transparent reflection-type hologram has a printed layer.

19. A transfer sheet as claimed in claim 10, wherein said transparent reflection-type hologram is colored.

20. A transfer sheet as claimed in claim 10, wherein said holographic effect-enhancing layer comprises a thin metal film of a thickness not exceeding 200 Å

.

21. A transfer sheet as claimed in claim 10, wherein said holographic effect-enhancing layer is disposed on at least a part of said transparent hologram-forming layer.

22. A transfer sheet as claimed in claim 10, wherein a relief hologram is formed on at least a part of said transparent hologram-forming layer.

23. A transparent reflection-type hologram sheet comprising a releasing layer, a transparent reflection-type hologram laminated on one surface thereof, and an adhesive layer disposed between said releasing layer and said transparent reflection-type hologram;

said transparent reflection-type hologram comprising a transparent hologram-forming layer including a relief-hologram forming surface, and a holographic effect-enhancing layer comprising a thin transparent film, said holographic effect-enhancing layer having a refractive index n₂ different from a refractive index n₁ of said transparent hologram-forming layer and being formed on the relief-hologram forming surface of the transparent hologram-forming layer, the difference between the refractive index n₁ and the refractive index n₂ being more than 0.2.

24. A sheet as claimed in claim 23, wherein n₂ -n₁ ≧

1.0.

25. A sheet as claimed in claim 23, wherein a protective layer for protecting the surface of a hologram is disposed on a surface of said transparent hologram-forming layer.

26. A sheet as claimed in claim 23, wherein a fragile layer is disposed between said transparent reflection-type hologram and said adhesive layer.

27. A sheet as claimed in claim 23, wherein said transparent reflection-type hologram has a printed layer.

28. A sheet as claimed in claim 23, wherein said transparent-type hologram is colored.

29. A sheet as claimed in claim 23, wherein said holographic effect-enhancing layer comprises a thin metal film of a thickness not exceeding 200 Å

.

30. A sheet as claimed in claim 23, wherein a printed layer is formed between said layers.

31. A sheet as claimed in claim 23, wherein at least one of said respective layers is colored.

32. A sheet as claimed in claim 23, wherein said holographic effect-enhancing layer is disposed on at least a part of said transparent hologram-forming layer.

33. A sheet as claimed in claim 23, wherein a hologram is formed on at least a part of said transparent hologram-forming layer.

34. A transparent reflection-type hologram article comprising a transparent reflection-type hologram formed on the surface or internally of a substrate;

said transparent reflection-type hologram comprising a transparent hologram-forming layer including a relief-hologram forming surface, and a holographic effect-enhancing layer comprising a thin transparent film, said holographic effect-enhancing layer having a refractive index n₂ different from a refractive index n₁ of said transparent hologram-forming layer and being formed on the relief-hologram forming surface of the transparent hologram-forming layer, the difference between the refractive index n₁ and the refractive index n₂ being more than 0.2.

35. An article as claimed in claim 34, wherein n₂ -n₁ ≧

1.0.

36. An article as claimed in claim 34, wherein said holographic effect-enhancing layer comprises a thin metal film of a thickness not exceeding 200 Å

.

37. An article as claimed in claim 34, wherein said holographic effect-enhancing layer is disposed on at least a part of said transparent hologram-forming layer.

38. An article as claimed in claim 34, wherein a printed layer is formed on the surface of and/or inside said transparent hologram-forming layer and/or said holographic effect-enhancing layer.

39. An article as claimed in claim 34, wherein at least one of said transparent hologram-forming layer and holographic effect-enhancing layer is colored.

40. An article as claimed in claim 34, wherein said hologram-forming layer forms the substrate.

41. A sheet as claimed in claim 34, further comprising a base sheet laminated on the surface of said transparent hologram-forming layer.

42. A sheet as claimed in claim 41, wherein a printed layer is formed between and/or on said layers.

43. A sheet as claimed in claim 41, wherein at least one of said layers is colored.