Copy-protected optical disc and method of manufacture thereof

• US 20020001690A1
• Filed: 12/15/2000
• Published: 01/03/2002
• Est. Priority Date: 06/30/2000
• Status: Abandoned Application

• Current Assignee: Verification Technologies, Inc. (Sun Chemical, Inc.)
• Original Assignee: Verification Technologies, Inc. (Sun Chemical, Inc.)
• Inventors: Drew, Jeffrey M., Selinfreund, Richard H.
• Application Number:
  US09/739,090
• Publication Number:
  US 20020001690A1
• Time in Patent Office: Days
• US Class Current: 428/64.4
• CPC Class Codes: G11B 19/04 Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
• CPC Class Codes: G11B 19/12 by sensing distinguishing features of or on records, e.g. diameter end mark
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/00586 said format change concerning the physical format of the recording medium
• CPC Class Codes: G11B 20/00768 wherein copy control information is used, e.g. for indicating whether a content may be copied freely, no more, once, or never, by setting CGMS, SCMS, or CCI flags
• CPC Class Codes: G11B 20/00876 wherein physical copy protection means are attached to the medium, e.g. holograms, sensors, or additional semiconductor circuitry
• CPC Class Codes: G11B 20/00927 wherein said defects or errors are generated on purpose, e.g. intended scratches
• CPC Class Codes: G11B 23/281 by changing the physical properties of the record carrier
• CPC Class Codes: G11B 7/24 Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the arrangement of information on the carrier G11B7/007
• CPC Class Codes: G11B 7/243 comprising inorganic materials only, e.g. ablative layers
• CPC Class Codes: G11B 7/247 methine or polymethine dyes
• CPC Class Codes: G11B 7/26 Apparatus or processes specially adapted for the manufacture of record carriers

Abstract

A method for fabricating read-only copy protected optical dics comprising a light-sensitive material at positions capable of altering the data read during copying of the disc but permitting read of the underlying data in the reading of the disc.

Claims

1. A method for fabricating an optical disc, said method comprising the steps of:

molding a substrate so as to have a first major surface with information pits thereon and a second major surface that is relatively planar;

placing light-sensitive material on or within said second major surface;

sealing said second major surface having said light sensitive material with a protective material so as to protect said light sensitive material from the ambient environment;

metalizing said first major surface;

sealing said metalized first major surface so as to protect said metal from the ambient environment.

2. The method of claim 1 wherein said substrate comprises polycarbonate.

3. The method of claim 1 wherein the light-sensitive material is a fluorescent compound.

4. The method of claim 1 wherein the light-sensitive material comprises a cyanine compound.

5. The method of claim 1 wherein the light-sensitive material is exitable by a light source emitting light at a wavelength between about 770 nm to about 830 nm.

6. The method of claim 1 wherein the light-sensitive materialis excitable by a light source emitting at a wavelength between about 630 nm to about 650 nm.

7. The method of claim 1 wherein the light-sensitive material is adapted to emit at 780 nm.

8. The method of claim 1 wherein the light-sensitive material is adapted to emit at 530 nm.

9. The method of claim 1 wherein the light-sensitive material excitable by a light source emitting light at a wavelength about 780 nm and a light source emitting at a wavelength about 530 nm.

10. The method of claim 1 wherein the light-sensitive material is on said second major surface of said substrate at distinct loci.

11. The method of claim 1 wherein the light-sensitive material is diffusively placed on said second major surface of said substrate by spin coating.

12. A method for fabricating an optical disc, said method comprising the steps of:

obtaining a first substrate having a first major surface and a second major surface;

placing light-sensitive material on or within one or both major surfaces of said first substrate;

obtaining a second substrate having a first and a second major surface, said first major surface having information pits thereon;

affixing said first substrate having said light-sensitive material to said second substrate to said second major surface of said second substrate.

13. The method of claim 12 wherein said first substrate comprises polycarbonate.

14. The method of claim 12 wherein said second substrate comprises polycarbonate.

15. The method of claim 12 wherein the light-sensitive material is a fluorescent compound.

16. The method of claim 12 wherein the light-sensitive material comprises a cyanine compound.

17. The method of claim 12 wherein the light-sensitive material is excitable by a light source emitting light at a wavelength between about 770 nm to about 830 nm.

18. The method of claim 12 wherein the light-sensitive materialis excitable by a light source emitting at a wavelength between about 630 nm to about 650 nm.

19. The method of claim 12 wherein the light-sensitive material is adapted to emit at 780 nm.

20. The method of claim 12 wherein the light-sensitive material is adapted to emit at 530 nm.

21. The method of claim 12 wherein the light-sensitive material excitable by a light source emitting light at a wavelength about 780 nm and a light source emitting at a wavelength about 530 nm.

22. The method of claim 12 wherein the light-sensitive material is placed at distinct loci.

23. The method of claim 12 wherein the light-sensitive material is diffusively applied by spin coating.

24. A method for fabricating an optical disc, said method comprising the steps of:

obtaining a first substrate having a first major surface and a second major surface, said first or second major surface, or both, having a detectable registration mark;

imprinting in select areas said first major surface of said first substrate layer with light-sensitive material;

obtaining a second substrate having a first major surface and a second major surface, said first major surface of said second

substrate layer having information pits thereon and either of said first or second major surface, or both, having a detectable registration mark;

affixing said second major surface of said second substrate along said first major surface of said first substrate so as said detectable registration marks overlap each other;

metalizing said first major surface of said second substrate layer having said information pits;

disposing a first overcoat layer along said metalized surface; and

optionally disposing a second overcoat layer along said second major surface of said first substrate layer.

25. The method of claim 24 wherein said first substrate comprises polycarbonate.

26. The method of claim 24 wherein said second substrate comprises polycarbonate.

27. The method of claim 24 wherein the light-sensitive material is a fluorescent compound.

28. The method of claim 24 wherein the light-sensitive material comprises a cyanine compound.

29. The method of claim 24 wherein the light-sensitive material is exitable by a light source emitting light at a wavelength between about 770 nm to about 830 nm.

30. The method of claim 24 wherein the light-sensitive materialis excitable by a light source emitting at a wavelength between about 630 nm to about 650 nm.

31. The method of claim 24 wherein the light-sensitive material is adapted to emit at 780 nm.

32. The method of claim 24 wherein the light-sensitive material is adapted to emit at 530 nm.

33. The method of claim 24 wherein the light-sensitive material excitable by a light source emitting light at a wavelength about 780 nm and a light source emitting at a wavelength about 530 nm.

34. The method of claim 24 wherein the light-sensitive material is placed at distinct loci.

35. The method of claim 24 wherein the light-sensitive material is diffusively applied by spin coating.

36. An optical disc comprising:

a first substrate layer having a first major surface and a second major surface, said first major surface of said first substrate layer having light-sensitive material thereon;

a second substrate layer having a first major surface and a second major surface, said first major surface of said second substrate layer having information pits thereon, and said second major surface being disposed along said first major surface of said first substrate layer;

a metal reflector layer said metal reflector layer being disposed along said first major surface of said second substrate layer;

a first overcoat layer being disposed along said metal reflector layer; and

optionally a second overcoat layer being disposed along said second major surface of said first substrate layer.