Metallized information carrying discs

• US 4,363,844 A
• Filed: 09/22/1980
• Issued: 12/14/1982
• Est. Priority Date: 09/22/1980
• Status: Expired due to Term

• Current Assignee: 3M Company
• Original Assignee: 3M Company
• Inventors: Kerfeld, Donald J., Lewis, Terry W., Anderson, Roger J.
• Primary Examiner(s): Robinson, Ellis P.
• Application Number:
  US06/189,000
• Time in Patent Office: 813 Days
• Field of Search: 369/283, 369/284, 369/275, 369/288, 369/286, 264/106, 264/107, 428/64, 428/65, 428/463, 428/174, 428/163, 428/334-336, 358/128.5, 358/128.6, 346/76 L, 346/77 E, 346/135.1, 346/137, 360/135, 427/44, 427/54.1, 156/272, 156/245, 156/244.24
• US Class Current: 428/848.5
• CPC Class Codes: G11B 23/0057 Intermediate mediums, i.e. mediums provided with an information structure not specific to the method of reproducing or duplication such as matrixes for mechanical pressing of an information structure for record carriers with directly readable mechanical information G11B3/685; record carriers having a relief information structure provided with or included in layers not specific for a single reproducing method; apparatus or processes specially adapted for their manufacture
• CPC Class Codes: G11B 7/26 Apparatus or processes specially adapted for the manufacture of record carriers
• CPC Class Codes: G11B 9/061 Record carriers characterised by their structure or form or by the selection of the material; Apparatus or processes specially adapted for the manufacture of record carriers processes involving a single technical art and for which provision exists elsewhere, see the relevant class, e.g. B05D, F16N, C08L
• CPC Class Codes: Y10T 428/24537 Parallel ribs and/or grooves
• CPC Class Codes: Y10T 428/24628 Nonplanar uniform thickness material
• CPC Class Codes: Y10T 428/263 Coating layer not in excess of 5 mils thick or equivalent
• CPC Class Codes: Y10T 428/264 Up to 3 mils
• CPC Class Codes: Y10T 428/265 1 mil or less
• CPC Class Codes: Y10T 428/31699 Ester, halide or nitrile of addition polymer

Abstract

A coded information structure capable of being decoded electronically comprising a base and a first layer of an electrically conductive or electromagneted radiation reflective layer adhered to said base wherein said layer having coded information in the form of areas of said layer having been vertically displaced and having ruptures or necking or the side of the depression and an insulating or transparent protective layer over said first layer.

Claims

1. A coded information carrying structure capable of being electronically decoded comprising

(1) a base,

(2) a first layer of an electrically conductive or electromagnetic radiation reflective layer adhered to at least one surface of said base, said layer having coded information in the form of depressions in said layer having been vertically displaced a distance of from 0.03 to 10.0 micrometers, with said first layer having ruptures or necking on the sides of the depressions, and

(3) an insulating or transparent protective layer over said first layer.

2. The structure of claim 1 wherein said protective layer is not of uniform thickness with respect to thickness measured from the surface of the protective layer to non-displaced areas of said electrically conductive or electromagnetic radiation reflective layer and said vertically displaced areas.

3. The structure of claim 2 wherein said vertically displaced areas are discrete areas deformed from said first layer and said protective layer is an organic polymer layer.

4. The structure of claim 2 wherein said first layer is a metal layer.

5. The structure of claim 3 wherein said first layer is a metal layer.

6. The structure of claim 2 wherein said structure is in the form of a disc.

7. The structure of claim 5 wherein said structure is in the form of a disc.

8. The structure of claim 2 wherein said base comprises a substrate wherein at least the surface of said base to which said first layer is adhered is a crosslinked polymer.

9. The structure of claim 5 wherein said base comprises a substrate wherein at least the surface of said base to which said first layer is adhered is a crosslinked polymer.

10. The structure of claim 1 wherein said vertically displaced areas form a spiral array of protrusions and/or depressions having an average variation in height or depth from the average surface level of the non-displaced surface of said first layer of from 0.03 to 10.0 micrometers.

11. The structure of claim 2 wherein said protective layer is an insulating layer of from 1 to 100 nm.

12. The structure of claim 7 wherein said protective layer is an insulating layer of from 1 to 100 nm.

13. The structure of claim 2 wherein said vertically displaced areas form a spiral array of protrusions and/or depressions having an average variation in height or depth from the average surface level of the non-displaced surface of said first layer of from 0.03 to 10.0 micrometers.

14. The structure of claim 5 wherein said metal layer has a thickness of from 0.2 to 200 nm.

15. The structure of claim 7 wherein said metal layer has a thickness of from 0.2 to 75 nm.

16. The structure of claim 7 wherein said metal layer has a thickness of from 0.2 to 75 nm.

17. The structure of claim 13 wherein said metal layer has a thickness of from 0.2 to 75 nm.

18. The structure of claim 17 wherein said metal layer comprises chromium, iron, nickel, rhodium, titanium, tantalum, aluminum, silver, gold, indium, tin, or alloys thereof.

19. The structure of claim 2 wherein said base has on opposite surfaces both

(1) a first layer of an electrically conductive or electromagnetic radiation reflective layer adhered to at least one surface of said base, said layer having coded information in the form of areas of said layer having been vertically displaced, and

(2) a protective layer over said first layer which is not of uniform thickness with respect to thickness measured from the surface of the protective layer to non-displaced areas of said electrically conductive or electromagnetic radiation reflective layer and said vertically displaced areas.

20. A composite structure comprising two structures according to claim 2 which are adhered so that the vertically displaced areas of each extend away from each other.

21. A composite structure comprising two structures according to claim 2 which are adhered so that the vertically displaced areas of each extend towards each other.

24. The structure of claim 8 wherein said protective layer is an insulating layer of from 1 to 100 nm.

25. The structure of claim 13 wherein said protective layer is an insulating layer of from 1 to 100 nm.

26. The structure of claim 12 wherein said insulating layer is an organic polymeric layer.

27. The structure of claim 25 wherein said insulating layer is an organic polymeric layer.

22. A two-sided information carrying structure comprising two bases, each base having a first layer of an electrically conductive or electromagnetic radiation reflective layer adhered to one surface of each base, said first layers having coded information in the form of depressions in said layer having been vertically displaced a distance of from 0.03 to 10.0 micrometers, with said first layers having ruptures or necking on the sides of the depressions, said first layers being adhered together.

23. The structure of claim 22 wherein said first layers are metal layers.

28. A process for forming an information bearing article which comprises embossing coded information which may be electronically decoded onto a multilayered article comprising

(a) a base having at least one thermoplastic surface and adhered onto said surface,

(b) an electrically conductive layer or electromagnetic radiation reflective layer

to form a coded information bearing surface on said layer, said coded information being formed by the vertical displacement of areas of said layer to a depth of 0.03 to 10.0 micrometers with said layer having ruptures or necking on the side of said depression.

29. The process of claim 28 wherein said areas are discrete areas.

30. The process of claim 28 wherein said vertically displaced areas form a spiral array of protrusions and/or depressions having an average variation in height or depth from the average surface level of the non-displaced surface of said layer of from 0.03 to 10.0 micrometers.

31. The process of claim 30 wherein said layer is a metal layer.

32. The process of claim 31 wherein said metallayer has a thickness of from 0.2 to 75 nm.

33. The process of claim 28 wherein said base comprises a substrate having as said at least one thermoplastic surface a layer of a thermoplastic, radiation curable, polymeric resin, and wherein said resin is irradiated to cure said resin during embossing and before said multilayered article is removed from the mold used during embossing.

34. The process of claim 33 wherein said irradiation is projected through the base.

35. The process of claim 33 wherein said radiation curable polymeric resin contains a multiplicity of radiation curable acryloyl or methacryloyl groups.

36. The process of claim 32 wherein said base comprises a substrate having as said at least one thermoplastic surface a layer of a thermoplastic, radiation curable, polymeric resin, and wherein said resin is irradiated to cure said resin during embossing and before said multilayered article is removed from the mold used during embossing.

37. The process of claim 33 wherein said radiation curable polymeric resin contains a multiplicity of radiation curable acryloyl or methacryloyl groups.