METAL ALLOYS FOR THE REFLECTIVE LAYER OF AN OPTICAL STORAGE MEDIUM

• US 20070014963A1
• Filed: 07/12/2006
• Published: 01/18/2007
• Est. Priority Date: 07/12/2005
• Status: Abandoned Application

• Current Assignee: Target Technology Company LLC
• Original Assignee: Target Technology Company LLC
• Inventors: Nee, Han
• Application Number:
  US11/457,002
• Publication Number:
  US 20070014963A1
• Time in Patent Office: Days
• US Class Current: 428/64.100
• CPC Class Codes: C22C 9/00 Alloys based on copper
• CPC Class Codes: C22C 9/04 with zinc as the next major constituent
• CPC Class Codes: C22C 9/06 with nickel or cobalt as the next major constituent
• CPC Class Codes: G11B 2007/25706 containing transition metal elements (Zn, Fe, Co, Ni, Pt)
• CPC Class Codes: G11B 2007/25708 containing group 13 elements (B, Al, Ga)
• CPC Class Codes: G11B 2007/2571 containing group 14 elements except carbon (Si, Ge, Sn, Pb)
• CPC Class Codes: G11B 2007/25713 containing nitrogen
• CPC Class Codes: G11B 2007/25715 containing oxygen
• CPC Class Codes: G11B 2007/25716 containing sulfur
• CPC Class Codes: G11B 7/24038 Multiple laminated recording layers
• CPC Class Codes: G11B 7/2433 Metals or elements of Groups 13, 14, 15 or 16 of the Periodic Table, e.g. B, Si, Ge, As, Sb, Bi, Se or Te
• CPC Class Codes: G11B 7/246 containing dyes
• CPC Class Codes: G11B 7/2467 azo-dyes
• CPC Class Codes: G11B 7/2472 cyanine
• CPC Class Codes: G11B 7/248 porphines; azaporphines, e.g. phthalocyanines
• CPC Class Codes: G11B 7/2534 polycarbonates [PC]
• CPC Class Codes: G11B 7/258 of reflective layers
• CPC Class Codes: Y10T 428/21 Circular sheet or circular blank

Abstract

A copper-based alloy film is provided for the highly reflective layer of optical discs. Alloy additions to copper include, silver, magnesium, nickel, zinc, cobalt, boron, aluminum, and indium. These alloys have moderate to high reflectivity and reasonable corrosion resistance in ambient environments.

Claims

1. An optical storage medium, comprising:

at least one layer having a pattern of features in at least one major surface;

at least one reflective coating adjacent to at least one layer having a pattern of features in at least one major surface said reflective layer including a metal alloy, said metal alloy including copper, silver and magnesium, wherein the relationship between the amounts of copper, silver and magnesium in said metal alloy is defined by Cu_xAg_yMg_z, wherein 0.9<

x<

0.9998, 0.0001<

y<

0.05 and 0.0001<

z<

0.05.

2. The optical storage medium according to claim 1, further including at least one optical recording layer adjacent to said at least one reflective coating.

3. The optical storage medium according to claim 2, wherein said optical recording layer includes a dye selected from the group comprising cyanine compounds, azo compounds and phthalocyanine compounds.

4. The optical storage medium according to claim 1, wherein 0.97<

x<

0.997, 0.001<

y<

0.015, 0.001<

z<

0.03.

5. The optical storage medium according to claim 1, wherein said metal alloy further includes between 0.1 and 10.0 a/o percent zinc.

6. An optical storage medium, comprising:

at least one layer having a pattern of features in at least one major surface;

at least one reflective layer adjacent to at least one layer having a pattern of features in at least one major surface said reflective layer including a metal alloy, said metal alloy including copper, silver and zinc, wherein the relationship between the amounts of copper, silver and zinc in said metal alloy is defined by Cu_xAg_yZn_u, wherein 0.85<

x<

0.9998, 0.0001<

y<

0.05 and 0.0001<

u<

0.10.

7. The optical storage medium according to claim 6, further including at least one optical recording layer adjacent to said at least one reflective coating.

8. The optical storage medium according to claim 7, wherein said optical recording layer includes a dye selected from the group comprising cyanine compounds, azo compounds and phthalocyanine compounds.

9. An optical storage medium, comprising:

at least one layer having a pattern of features in at least one major surface;

at least one reflective layer adjacent to at least one layer having a pattern of features in at least one major surface said reflective layer including a metal alloy, said metal alloy including copper, magnesium and nickel, wherein the relationship between the amounts of copper, magnesium and nickel in said metal alloy is defined by Cu_xMg_yNi_v, wherein 0.85<

x<

0.9998, 0.0001<

z<

0.05 and 0.0001<

v<

0.10.

10. An optical storage medium, comprising:

at least one layer having a pattern of features in at least one major surface;

at least one reflective layer adjacent to at least one layer having a pattern of features in at least one major surface said reflective layer including a metal alloy, said metal alloy including copper, silver and zinc, wherein the relationship between the amounts of copper, silver and zinc in said metal alloy is defined by Cu_xAg_yZn_u, wherein 0.85<

x<

0.9998, 0.0001<

y<

0.05 and 0.0001<

u<

0.10.

11. The optical storage medium according to claim 10, further including at least one optical recording layer adjacent to said at least one reflective coating.

12. The optical storage medium according to claim 11, wherein said optical recording layer includes a dye selected from the group comprising cyanine compounds, azo compounds and phthalocyanine compounds.

13. An optical storage medium, comprising:

at least one layer having a pattern of features in at least one major surface;

at least one reflective layer adjacent to at least one layer having a pattern of features in at least one major surface said reflective layer including a metal alloy, said metal alloy including copper, zinc and magnesium, wherein the relationship between the amounts of copper, zinc, and magnesium in said metal alloy is defined by Cu_xZn_yMg_z, wherein 0.85<

x<

0.9998, 0.0001<

u<

0.10, and 0.0001<

z<

0.05.

14. The optical storage medium according to claim 13, wherein said metal alloy further includes between 0.1 and 5.0 a/o percent nickel.

15. An optical storage medium, comprising:

at least one layer having a pattern of features in at least one major surface;

at least one reflective layer adjacent to at least one layer having a pattern of features in at least one major surface said reflective layer including a metal alloy, said metal alloy including copper, silver and nickel, wherein the relationship between the amounts of copper, silver and nickel in said metal alloy is defined by Cu_xAg_yNi_v, wherein 0.85<

x<

0.9998, 0.0001<

y<

0.05 and 0.0001<

v<

0.10.

16. The optical storage medium according to claims 15, wherein said metal alloy further includes at one additional element selected from the group consisting of Co, B, Al, In or mixtures thereof, wherein said additional element is present in said metal alloy in the amount of between about 0.01 to about 5.0 a/o percent of copper in said metal alloy.

17. The optical storage medium according to claim 15, further including at least one optical recording layer adjacent to said at least one reflective coating.

18. The optical storage medium according to claim 17, wherein said optical recording layer includes a dye selected from the group comprising cyanine compounds, azo compounds and phthalocyanine compounds.

19. The optical storage medium according to claim 15, wherein said metal alloy further includes between 0.1 and 5.0 a/0 percent zinc.

20. An optical storage medium, comprising:

at least one layer having a pattern of features in at least one major surface;

at least one reflective layer adjacent to at least one layer having a pattern of features in at least one major surface said reflective layer including a metal alloy, said metal alloy including copper, and nickel, wherein the relationship between the amounts of copper and nickel in said metal alloy is defined by Cu_xNi_v, wherein 0.80<

x<

0.9999, 0.0001<

v<

0.20.

21. The optical storage medium according to claim 20, further including at least one optical recording layer adjacent to said at least one reflective coating.

22. The optical storage medium according to claim 21, wherein said optical recording layer includes a dye selected from the group comprising cyanine compounds, azo compounds and phthalocyanine compounds.

23. The optical storage medium according to claim 20, wherein the amount of nickel in said alloy is given by 0.0001<

v<

0.01.

24. An optical storage medium, comprising:

at least one layer having a pattern of features in at least one major surface;

at least one reflective layer adjacent to at least one layer having a pattern of features in at least one major surface said reflective layer including a metal alloy, said metal alloy including copper, and zinc, wherein the relationship between the amounts of copper and zinc in said metal alloy is defined by Cu_xZn_u, wherein 0.90<

x<

0.9999, 0.0001<

u<

0.10.

25. The optical storage medium according to claim 24, wherein the said metal alloy further includes at least one additional element selected from the group consisting of Co, B, Al, In and mixture thereof, wherein said additional element is present in said metal alloy in the amount of between about 0.01 to about 5.0 a/o percent of the copper present in the alloy.

26. The optical storage medium according to claim 24, further including at least one optical recording layer adjacent to said at least one reflective coating.

27. The optical storage medium according to claim 26, wherein said optical recording layer includes a dye selected from the group comprising cyanine compounds, azo compounds and phthalocyanine compounds.