Claims
- 1. A uniaxially electrically conductive article comprising electrically insulating sheet material with through-holes individually containing electrically conductive material with overplated ends each acting as a collar to help retain the conductive material in the holes, and each such hole providing an electrically conductive path between the main surfaces of the sheet material.
- 2. An article according to claim 1, wherein the conductive material in at least some of the said through-holes comprises a first portion of electrically conductive material in contact with the interior hole surface, and a second portion of electrically conductive material on at least one of the end surfaces of the first portion, at least the second portion projecting beyond the sheet surfaces.
- 3. An article according to claim 1, wherein electrically insulating material has been removed from at least one of the main surfaces of the sheet material to expose portions of the electrically conductive material originally within the through-holes, prior to overplating of the ends.
- 4. An article according to claim 1, having metal plated in the said through-holes.
- 5. An article according to claim 1, wherein at least some of the through-holes are not more than 200 micrometers in diameter.
- 6. An article according to claim 5, wherein at least some of the said through-holes are less than 100 micrometers diameter.
- 7. An article according to claim 1, wherein at least a significant proportion of the through-holes contain a tubular formation of the electrically conductive material.
- 8. An article according to claim 5, wherein the through-holes are 5 to 150 micrometers in diameter.
- 9. An article according to claim 8, wherein through-holes are 10 to 100 micrometers in diamter.
- 10. An article according to claim 7, wherein the conductive material in at least some of the said through-holes comprises a tubular first portion of electrically conductive material in contact with the hole interior surface, and a second portion of material in contact with the surface of the tube provided by the first portion.
- 11. An article according to claim 10, wherein the second portion of material is also tubular.
- 12. An article according to claim 10, wherein electrically conductive material of the said second portion is different from the electrically conductive material of the said first portion.
- 13. An article according to claim 7, wherein electrically conductive material, fusible alloy is within the tube provided by the tubular electrically conductive material.
- 14. An article according to claim 1, wherein the said through-holes have a tortuosity less than 3, preferably less than 1.2.
- 15. An article according to claim 1, wherein the electrically insulating sheet material is capable of retaining at least 50%, preferably at least 75%, more preferably at least 85%, of its original elongation after immersion in water of pH 10 at 100.degree. C. for 4 days according to ASTM D882.
- 16. An article according to claim 1, wherein the electrically insulating sheet material is a polyimide derived from polymerisation of 4,4'-biphenyl dianhydride and 4,4-diaminobiphenyl.
- 17. An article according to claim 1, wherein the said through-holes have been made by laser drilling, preferably by U.V. laser ablation.
- 18. An article according to claim 1, wherein the said through-holes have a taper (relative to the hole axis) of less than 10%, preferably less than 8.degree..
- 19. An article according to claim 18, wherein the taper is less than 6.degree., preferably less than 4.degree..
- 20. An article comprising a strip of electrically insulating sheet material carrying two or more arrays of the through-holes containing electrically conductive material as specified in claim 1, the arrays being spaced from one another along the strip.
- 21. An article according to claim 1, wherein the electrically insulating sheet material is a polyimide derived from polymerisation of 4,4'-biphenyl dianhydride and 4,4'-diaminobiphenylether.
- 22. An article according to claim 1, wherein the electrically insulating sheet material is a polyimide derived from polymerisation of 4,4'-biphenyl dianhydride and phenylenediamine.
Priority Claims (6)
Number |
Date |
Country |
Kind |
8802565 |
Feb 1988 |
GBX |
|
8802567 |
Feb 1988 |
GBX |
|
8815447 |
Jun 1988 |
GBX |
|
8823053 |
Sep 1988 |
GBX |
|
8828245 |
Dec 1988 |
GBX |
|
PCT/GB89/00110 |
Feb 1989 |
WOX |
|
Parent Case Info
This application is a continuation of application Ser. No. 07/548,964, filed as PCT/GB89/00110, Feb. 3, 1989 published as WO89/07338, aug. 10, 1989, now abandoned.
US Referenced Citations (20)
Foreign Referenced Citations (26)
Number |
Date |
Country |
0034243 |
Aug 1981 |
EPX |
0106990 |
May 1984 |
EPX |
0160236 |
Jun 1985 |
EPX |
0160761 |
Nov 1985 |
EPX |
0171232 |
Feb 1986 |
EPX |
0213774 |
Mar 1987 |
EPX |
0183598 |
Jun 1987 |
EPX |
0245179 |
Nov 1987 |
EPX |
0213774 |
Nov 1987 |
EPX |
547877 |
Jan 1979 |
JPX |
1238148 |
Sep 1989 |
JPX |
2310941 |
Dec 1990 |
JPX |
914839 |
Jan 1963 |
GBX |
1262787 |
Feb 1972 |
GBX |
1311659 |
Mar 1973 |
GBX |
1502517 |
Mar 1978 |
GBX |
1268978 |
Mar 1979 |
GBX |
1545701 |
May 1979 |
GBX |
1284481 |
Aug 1979 |
GBX |
2017408 |
Oct 1979 |
GBX |
1569379 |
Jun 1980 |
GBX |
1587416 |
Apr 1981 |
GBX |
2149980 |
Jun 1985 |
GBX |
2189657 |
Oct 1987 |
GBX |
1341037 |
Dec 1973 |
WOX |
8704316 |
Jul 1987 |
WOX |
Non-Patent Literature Citations (6)
Entry |
Japanese Laid-Open Patent Publication No. 61-110441 (US equivalent 4,703,559 enclosed). |
Japanese Laid-Open Patent Publication No. 61-265827. |
Japanese Laid-Open Patent Publication No. 55-098839. |
Japanese Laid-Open Patent Publication No. 61-194745. |
IBM Technical Disclosure Bulletin, vol. 32, #1013, Mar. 1990 pp. 474-475. |
"Direct Chip Bonding Using Transferred Conductive Adhesive Film". |
Continuations (1)
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Number |
Date |
Country |
Parent |
548964 |
Feb 1991 |
|