Data carrier with an optically variable element

• US 5,808,758 A
• Filed: 12/26/1995
• Issued: 09/15/1998
• Est. Priority Date: 12/23/1994
• Status: Expired due to Term

• Current Assignee: Giesecke & Devrient GmbH
• Original Assignee: Geisecke & Devrient GmbH
• Inventors: Solmsdorf, Bernhard
• Primary Examiner(s): Henry, Jon W.
• Application Number:
  US08/579,600
• Time in Patent Office: 994 Days
• Field of Search: 359/2, 359/567, 359/565, 359/571, 359/572, 289/91, 289/86, 289/902, 289/903, 289/904
• US Class Current: 359/2
• CPC Class Codes: B41M 3/148 Transitory images, i.e. images only visible from certain viewing angles
• CPC Class Codes: B42D 25/324 Reliefs
• CPC Class Codes: B42D 25/373 Metallic materials
• CPC Class Codes: B44F 1/10 Changing, amusing, or secret pictures
• CPC Class Codes: G06K 19/067 Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
• CPC Class Codes: G06K 19/16 the marking being a hologram or diffraction grating
• CPC Class Codes: Y10S 283/902 Anti-photocopy

Abstract

A data carrier with an optically variable element has a layer regularly reflecting incident light and including interruptions. A diffusely scattering layer is disposed on the regularly reflecting layer so as to be visible through at least one interruption to provide at least one optically recognizable marking based on the differences in the reflectivities of the two layers at different viewing angles.

Claims

1. A data carrier with an optically variable element disposed thereon, the optically variable element comprising:

a regularly reflecting layer which regularly reflects light incident thereon, the regularly reflecting layer having at least one interruption; and

a diffusely scattering layer which diffusely scatters light incident thereon, the diffusely scattering layer being disposed on the regularly reflecting layer so as to be visible through the at least one interruption in the regularly reflecting layer such that the diffusely scattering layer and the at least one interruption form at least one optically recognizable marking;

the diffusely scattering layer having a first reflectivity which is substantially constant at all viewing angles and being produced by changing the regularly reflecting surface; and

the regularly reflecting layer having a second reflectivity which is lower than the first reflectivity for at least one viewing angle and higher than the first reflectivity for at least one other viewing angle.

2. The data carrier of claim 1, characterized in that the regularly reflecting layer is a metal layer, a metallically lustrous layer or a metal-coated layer.

3. The data carrier of claim 2, characterized in that the diffusely scattering layer is a dimmed partial area of the metal layer.

4. The data carrier of claim 1, characterized in that the regularly reflecting surface is a sawtooth pattern, and the diffusely scattering surface element was produced by filling the sawtooth pattern with a color.

5. The data carrier of claim 1, characterized in that the optically variable element is formed as a transfer element and applied to a remainder of the data carrier.

6. The data carrier of claim 1, characterized in that the at least one optically recognizable marking comprises a halftone image.

7. The data carrier of claim 3, characterized in that the dimmed partial area of the metal layer comprises a roughened part of the metal layer.

8. A data carrier with an optically variable element disposed thereon, the optically variable element comprising:

a regularly reflecting layer which regularly reflects light incident thereon, the regularly reflecting layer having at least one interruption; and

a diffusely scattering layer which diffusely scatters light incident thereon, the diffusely scattering layer being disposed on the regularly reflecting layer so as to be visible through the at least one interruption in the regularly reflecting layer such that the diffusely scattering layer and the at least one interruption form at least one optically recognizable marking;

the diffusely scattering layer having a first reflectivity which is substantially constant at all viewing angles; and

the regularly reflecting layer being a metal layer, a metallically lustrous layer or a metal-coated layer and having a second reflectivity which is lower than the first reflectivity for at least one viewing angle and higher than the first reflectivity for at least one other viewing angle.

9. The data carrier of claim 8, characterized in that the optically variable element is formed as a transfer element and applied to a remainder of the data carrier.

10. The data carrier of claim 8, characterized in that the at least one optically recognizable marking comprises a half-tone image.

11. The data carrier of claim 8, characterized in that the diffusely scattering layer is disposed under the regularly reflecting layer.

12. The data carrier of claim 8, characterized in that the diffusely scattering layer comprises indicia indicating additional information, the indicia being disposed on at least a portion of the diffusely scattering layer which is visible through the at least one interruption.

13. The data carrier of claim 9, characterized in that the transfer element comprises an adhesive layer for adhering the transfer element to the remainder of the data carrier.

14. The data carrier of claim 9, further comprising a data carrier substrate, wherein the diffusely scattering layer is disposed between the regularly reflecting layer and the data carrier substrate.

15. The data carrier of claim 13, characterized in that the adhesive layer is poorly absorbing in a visible wavelength range.

16. The data carrier of claim 8, characterized in that the regularly reflecting layer has a sawtooth profile or diffraction grid.

17. The data carrier of claim 8, characterized in that the interruptions are incorporated using a laser.

18. The data carrier of claim 8, characterized in that the diffusely scattering layer is colored in a poorly absorbing color.

19. The data carrier of claim 18, characterized in that the diffusely scattering layer is white, yellow, light blue or pastel.

20. The data carrier of claim 12, characterized in that the additional information comprises patterns or characters.