Multilayer card-shaped data carrier and method for producing same

• US 5,304,789 A
• Filed: 10/15/1991
• Issued: 04/19/1994
• Est. Priority Date: 10/19/1990
• Status: Expired due to Term

• Current Assignee: GAO Gesellschaft Fur Automation und Organisation mbH
• Original Assignee: GAO Gesellschaft Fur Automation und Organisation mbH
• Inventors: Lob, Erwin, Killar, Wolfgang, Merkle, Hansjurgen, Kaule, Wittlich, Hierweger, Alexander
• Primary Examiner(s): Sikes: William L.
• Assistant Examiner(s): PHAN, TRONG Q
• Application Number:
  US07/776,155
• Time in Patent Office: 917 Days
• Field of Search: 235/491, 235/493, 235/494, 235/487, 283/89, 283/94, 283/100, 283/85
• US Class Current: 235/487
• CPC Class Codes: B41M 5/267 Marking of plastic artifacts, e.g. with laser
• CPC Class Codes: B42D 2033/20 Coloured material; Pigments or inks
• CPC Class Codes: B42D 25/00 Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof printing processes to produce identification or security features B41M3/14
• CPC Class Codes: B42D 25/378 Special inks
• CPC Class Codes: B42D 25/382 absorbing or reflecting infrared light
• CPC Class Codes: B42D 25/387 absorbing or reflecting ultraviolet light
• CPC Class Codes: B42D 25/41 using electromagnetic radiation B42D25/435 takes precedence
• CPC Class Codes: G06K 19/14 the marking being sensed by radiation

Abstract

A multilayer card-shaped data carrier has a layer appearing black in the visible wave range, but transparent or permeable to electromagnetic radiation in the invisible wavelength spectrum outside the wavelengths substantially between about 400 and 700 nanometers. The data carrier also has data markings camouflaged by the black layer produced within or below the black layer by a lasing device, which are likewise detectable by commercial optical readers operating in the invisible wavelength spectrum outside the wavelengths substantially between about 400 and 700 nanometers.

Claims

1. A multilayer card-shaped data carrier comprising:

a cover layer;

layers disposed below said cover layer, one of said layers disposed below said cover layer appearing black in the visible wavelength spectrum and being transparent or permeable to electromagnetic radiation in the invisible wavelength spectrum outside the wavelengths substantially between about 400 and 700 nanometers;

one of said layers disposed below said cover layer being absorbent to focused electromagnetic radiation in said invisible wavelength spectrum; and

a data marking produced by said focused electromagnetic radiation in said invisible wavelength spectrum disposed in said absorbent layer, said black layer camouflaging said data marking so as to render said data marking invisible in the visible wavelength spectrum substantially between about 400 and 700 nanometers.

2. The invention of claim 1, wherein said black layer is highly sensitized to said focused electromagnetic radiation in the invisible wavelength spectrum in that said black layer absorbs said focused electromagnetic radiation in the invisible wavelength spectrum to produce said data marking within said black layer.

3. The invention of claim 2, further comprising a contrasting opaque layer disposed beneath said black layer,

said cover layer disposed over said black layer being weakly sensitized to said focused electromagnetic radiation in the invisible wavelength spectrum to produce said data marking.

4. The invention of claim 1, wherein said absorbent layer is disposed beneath said black layer, said absorbent layer being substantially absorbent to focused electromagnetic radiation in said invisible wavelength spectrum.

5. The invention of claim 1, wherein said cover layer and said layers disposed below said cover layer and disposed above said black layer are transparent, opaque or colored in the visible wavelength spectrum substantially between about 400 and 700 nanometers, said transparent, opaque or colored layers being transparent or permeable to said electromagnetic radiation in said invisible wavelength spectrum or provided with a window area under which said data markings are disposed.

6. The invention of claim 1, further comprising prints or films containing pearlescent pigments disposed above the said black layer.

7. A multilayer card-shaped data carrier comprising:

a cover layer;

layers disposed below said cover layer, one of said layers disposed below said cover layer appearing black in the visible wavelength spectrum and being transparent or permeable to electromagnetic radiation in the invisible wavelength spectrum outside the wavelengths substantially between about 400 and 700 nanometers, said black layer being applied to said multilayer card-shaped data carrier to form visually recognizable or readable patterns or characters;

one of said layers disposed below said cover layer being absorbent to focused electromagnetic radiation in said invisible wavelength spectrum; and

a data marking produced by said focused electromagnetic radiation in said invisible wavelength spectrum disposed in said absorbent layer, said black layer camouflaging said data marking so as to render said data marking invisible in the visible wavelength spectrum substantially between about 400 and 700 nanometers.

8. The invention of claim 7, wherein said patterns or characters are detectable by a commercial optical character reader.

9. The invention of claim 8, wherein said data markings covered by said black layer are binary codes having a high information density compared with the optical character reader print.

10. The invention of claim 7, wherein said black layer applied to said multilayer card-shaped data carrier to form visually recognizable or readable patterns or characters and said data markings are visually combined.

11. The invention of claim 10, wherein said patterns or characters detectable by a commercial optical character reader bear certain information and said data marking bears certain information, said information of said characters being related to said information of said data marking.

12. A method for producing a multilayer card-shaped data carrier comprising the steps of:

forming a cover layer;

disposing layers below said cover layer, one of said layers disposed below said cover layer appearing black in the visible wavelength spectrum and being transparent or permeable to electromagnetic radiation in the invisible wavelength spectrum outside the wavelengths substantially between about 400 and 700 nanometers;

causing one of said layers disposed below said cover layer to be absorbent to focused electromagnetic radiation in said invisible wavelength spectrum; and

producing a data marking through said focused electromagnetic radiation in said invisible wavelength spectrum on said absorbent layer as a substantially last production step, said black layer camouflaging said data marking so as to render said data marking invisible in the visible wavelength spectrum substantially between about 400 and 700 nanometers.

13. The method of claim 12, wherein said data markings are formed directly in the black layer through said focused electromagnetic radiation in said invisible wavelength spectrum.

14. The method of claim 12, wherein said focused electromagnetic radiation in said invisible wavelength spectrum passes through said black layer without any substantial loss of energy, said data markings being formed below said black layer in a layer highly absorbent to electromagnetic radiation in said invisible wavelength spectrum.

15. The method of claim 12, wherein the intensity of said focused electromagnetic radiation in said invisible wavelength spectrum is adjustable, said focused electromagnetic radiation in said invisible wavelength spectrum creating no or substantially no visually discernable warps or thermal distortions on the surface of said multilayer card-shaped data carrier.

16. The method of claim 12, wherein said focused electromagnetic radiation in said invisible wavelength spectrum operates in the infrared wavelength spectrum.