Method for electroplating a substrate containing an electroplateable pattern

• US 5,681,441 A
• Filed: 12/22/1992
• Issued: 10/28/1997
• Est. Priority Date: 12/22/1992
• Status: Expired due to Fees

• Current Assignee: ELF Technologies Inc. (Totalenergies Se)
• Original Assignee: ELF Technologies Inc. (Totalenergies Se)
• Inventors: Svendsen, Leo Gulvad, Walker, Clifford James, Lykins, James Leborn II
• Primary Examiner(s): Gorgos, Kathryn L.
• Assistant Examiner(s): Leader, William T.
• Application Number:
  US07/994,687
• Time in Patent Office: 1,771 Days
• Field of Search: 205/114, 205/115, 205/125, 205/126, 205/136
• US Class Current: 205/114
• CPC Class Codes: C25D 5/02 Electroplating of selected surface areas
• CPC Class Codes: C25D 5/54 Electroplating of non-metallic surfaces C25D7/12 takes precedence
• CPC Class Codes: H05K 2203/0733 Method for plating stud vias, i.e. massive vias formed by plating the bottom of a hole without plating on the walls
• CPC Class Codes: H05K 3/0032 of organic insulating material
• CPC Class Codes: H05K 3/181 by electroless plating adhesives therefor H05K3/387
• CPC Class Codes: H05K 3/188 by direct electroplating
• CPC Class Codes: H05K 3/205 using a pattern electroplated or electroformed on a metallic carrier
• CPC Class Codes: H05K 3/242 characterised by using temporary conductors on the printed circuit for electrically connecting areas which are to be electroplated
• CPC Class Codes: H05K 3/423 characterised by electroplating method

Abstract

A method for the electroplating of conductive metal onto a substrate containing at least one hole and an electroplateable surface which is conducive to subsequent metal deposition comprises placing the substrate in close proximity to an electrode but such that there is no substantial electrical continuity between the electroplateable surface and the electrode prior to electroplating. The electroplateable surface is preferably an electroplateable pattern which comprises either a conductive metal pattern or a catalytic pattern for subsequent plating. This process can be employed with any electroplateable pattern technique which is recognized in the art such as, for example, printing, stamping, plating, photographic or electrophotographic processes. In one embodiment, this process can be employed in the production of Plated Wire, i.e., a product which can be effectively employed as a replacement for drawn wires in power distribution applications.

Claims

1. A method for the deposition of a conductive metal onto a substrate comprising:

(a) providing a substrate comprising a dielectric material and having an electroplateable pattern on a surface thereof;

wherein said electroplateable pattern comprises a material which is conducive to the subsequent deposition of a preselected metal and at least one hole extends through both the substrate and the electroplateable pattern;

(b) providing an electroplating environment including a cathode and an anode;

(c) placing the substrate in close proximity to the cathode but such that there is no substantial electrical continuity between the electroplateable pattern and any electrode prior to electroplating; and

(d) electroplating to (1) establish electrical continuity between the pattern and the cathode by way of at least one hole and (2) deposit metal directly on the surface of the electroplateable pattern so as to provide a final product.

2. The method according to claim 1 wherein the electroplateable pattern comprises a conductive metal pattern or a catalytic pattern for subsequent plating.

3. The method according to claim 2 wherein the electroplateable pattern comprises a conductive metal pattern.

4. The method according to claim 2 wherein the electroplateable pattern comprises a catalytic pattern.

5. The method according to claim 4 wherein the catalytic pattern is strike plated with an electrolessly deposited metal prior to (d).

6. The method according to claim 5 wherein the electrolessly deposited metal is selected from the group consisting of nickel, cobalt, silver, palladium, and copper.

7. The method according to claim 4 wherein the catalytic pattern is strike plated with an electrolytically deposited metal prior to (d).

8. The method according to claim 7 wherein the electrolytically deposited metal is copper.

9. The method according to claim 2 wherein the pattern is produced by printing, stamping, plating, photographic activation, photographic precipitation, photographic adhesion or electrophotographic deposition.

10. The method according to claim 2 wherein (d) comprises impingement electroplating.

11. The method according to claim 2 wherein the substrate includes a plurality of holes.

12. The method according to claim 11 wherein the holes are located across the substrate.

13. The method according to claim 11 wherein the holes are located within the electroplateable pattern.

14. The method according to claim 11 wherein the pattern is produced by electrophotographically depositing a plateable toner onto the substrate.

15. A method according to claim 14 wherein (a) further comprises the electroless deposition of a conductive metal from solution onto the pattern.

16. The method according to claim 15 wherein in (d) the pattern is electroplated with the copper to a thickness of about 50-250 μ

m.

17. The method according to claim 16 wherein the pattern has a shape which is substantially longitudinal and which includes at least one conductive path.

18. A method for the deposition of a conductive metal onto a component comprising:

(a) providing a component consisting essentially of a dielectric substrate and an electroplateable pattern on a surface of the substrate, wherein said electroplateable pattern comprises a material that is conducive to the subsequent deposition of a preselected metal, and at least one hole extends through both the substrate and the electroplateable pattern;

(b) providing an electroplating environment including a cathode and an anode;

(c) placing the component in close proximity to the cathode but such that there is no substantial electrical continuity between the electroplateable pattern and any electrode prior to electroplating; and

(d) electroplating to (1) establish electrical continuity between the pattern and the cathode by way of at least one hole and (2) deposit metal directly on the surface of the electroplateable pattern.