Electrical interconnects having a supported bulge configuration

• US 5,288,235 A
• Filed: 12/14/1992
• Issued: 02/22/1994
• Est. Priority Date: 12/14/1992
• Status: Expired due to Fees

• Current Assignee: Raytheon Company (Rtx Corporation)
• Original Assignee: Hughes Aircraft Company (Rtx Corporation)
• Inventors: Sobhani, Mohi
• Primary Examiner(s): Abrams, Neil
• Application Number:
  US07/989,612
• Time in Patent Office: 435 Days
• Field of Search: 439/67, 439/77, 439/493, 439/69, 29/846, 29/884, 29/882, 29/830, 174/254
• US Class Current: 439/67
• CPC Class Codes: H01R 12/61 connecting to flexible printed circuits, flat or ribbon cables or like structures
• CPC Class Codes: H01R 12/613 by means of interconnecting elements
• CPC Class Codes: H01R 12/62 connecting to rigid printed circuits or like structures
• CPC Class Codes: H05K 1/0393 Flexible materials H05K1/038 takes precedence; specific organic compositions are classified in H05K1/0313 and subgroups
• CPC Class Codes: H05K 2201/0367 Metallic bump or raised conductor not used as solder bump solder materials or compositions and methods of application thereof H05K3/3457
• CPC Class Codes: H05K 2201/0382 Continuously deformed conductors
• CPC Class Codes: H05K 3/281 by means of a preformed insulating foil H05K3/284 takes precedence
• CPC Class Codes: H05K 3/4007 Surface contacts, e.g. bumps H05K3/4092 takes precedence; deposition of finish layers on pads H05K3/24; forming solder bumps H05K3/3457
• CPC Class Codes: Y10T 29/49155 Manufacturing circuit on or in base

Abstract

Electrical interconnects, contained in a supported bulge (42, 90) which extends substantially across a circuit or flexible cable (24, 92) in a continuous ridge pattern, are formed in both one or more of electrical conductors (32, 94) in the circuit or flexible cable and in any insulation (34, 98) underlying and adjacent to the conductors at the sites of the interconnects. The bulges may be placed individually in each conductor, or traverse the circuit or cable in a straight, curved, segmented or other broken or unbroken meandering path as a V-shaped or hollow shaped fold, wrinkle or crease in both the conductors and any insulation underlying the conductors at the sites of the interconnects. Supports (56, 108) for the bulges are so composed as to be physically, electrically and chemically compatible with their surrounding materials. Such interconnects are employable in circuits or flexible cables whose line widths and spacings are 3 mil (0.0762 mm) or less in dimension.

Claims

1. An electrical connector, capable of establishing electrical contacts in flat circuits having line widths and spacing of less than 3 mil, comprising:

a flat circuit having a smooth surface and including electrical conductors whose line widths and spacings may be less than 3 mil and which are encapsulated in dielectric material;

said conductors having sites defining positions of electrical interconnects and being free from said dielectric material on at least that conductor surface portion which is closest to the smooth surface of said circuit; and

a configuration, positioned at the sites, defining at least one ridge-like deformation extending across said circuit and both said conductors and any dielectric material contiguous thereto to define at least one ridged bulge in and across said conductors, for elevating those portions of said conductors and said dielectric material contiguous therewith and adjacent thereto at the sites above the smooth surface, and a support supporting said bulge being electrically, physically and chemically compatible with its surrounding materials.

2. An electrical connector comprising:

at least two stacked together flat circuits, each having a smooth surface and including electrical conductors encapsulated in dielectric material and which have sites defining positions of electrical interconnects that are free from said dielectric material on at least that conductor surface which is adjacent to a stacked one of said circuits; and

like configurations in each of said circuits, each of said configurations being positioned at the sites and defining at least one bulge in said conductors, for elevating those portions of said conductors at the sites above the smooth surface, said bulge configurations having interfittable concave and convex portions, to enable said conductors which are free from said dielectric material on both sides thereof and said bulge configurations therein in each of said circuits to interfit in electrical contact with one another when said circuits are stacked together; and

a support which is electrically physically and chemically compatible with its surrounding materials and which is fittable into one of said concave portions at an outer face of said stacked together circuits, for supporting said interfitted bulge configurations.

3. An electrical connector according to claim 2 in which said respective bulge configurations extend in like patterns across said respective conductors.

4. An electrical connector capable of establishing electrical contacts in flat circuits whose electrical lines have widths and spacings therebetween of 3 mil and less in dimension, comprising:

a flat circuit including electric conductors encapsulated in dielectric material and having a smooth surface, said conductors having sites defining positions of electrical interconnects and being free from said dielectric material on at least that conductor surface portion which is closest to the smooth surface of said circuit; and

a supported ridge-like bulge arrangement which extends at least substantially across said circuit and is positioned at the sites in both said conductors and any of said dielectric material underlying said conductors, and which includes ridge-like deformations for elevating those portions of said conductors at the sites above the smooth surface.

5. An electrical connector according to claim 4 further comprising a substantially inelastic support physically and chemically compatible with its surrounding materials and disposed in electrical insulation from said conductors and in said bulges for support thereof.

6. An electrical connector according to claim 5 which:

said bulge configuration comprises a plurality of bulges having concave and convex portions; and

said support comprises portions thereof placed in said concave portions.

7. An electrical connector according to claim 6 further comprising a backing on said substrate and said portions for support thereof.

8. An electrical connector according to claim 4 in which said bulge configuration comprises upsets in respective ones of said conductors and any of said underlying dielectric material.

9. An electrical connector according to claim 4 in which said bulge configuration comprises one of a wrinkle, V-shaped fold and crease continuously extending across at least some of said conductors and any of said underlying dielectric material.

10. An electrical connector according to claim 4 in which said bulge configuration extends in a continuous ridge pattern across said circuit and said conductors therein.

11. An electrical connector according to claim 10 in which said pattern extends linearly at an angle to said conductors.

12. An electrical connector according to claim 10 in which said pattern extends linearly and normally to said conductors.

13. An electrical connector according to claim 10 in which said pattern extends linearly and at a diagonal to said conductors.

14. An electrical connector according to claim 10 in which said pattern extends as a sequence of lines angularly disposed to one another and to said conductors.

15. An electrical connector according to claim 10 in which said pattern extends in a curved path across said conductors.

16. A method for providing electrical interconnects in a flat electrical circuit having a substantially uniformly smooth surface and electrical conductors which are sizable to 3 mil and less line width and spacing and are encapsulated in dielectric material, in which the conductors have sites defining the positions of the electrical interconnects and being free from the dielectric material on at least that conductor surface portion which is closest to the smooth surface of the circuit, comprising the step of forming supported deformations which extend substantially continuously across the circuit and in both the conductors and any dielectric material contiguous thereto for defining ridged bulges in the smooth surface at and adjacent to the sites in the conductors and any underlying and adjacent dielectric material for elevating those portions of the conductors, which are free from dielectric material, at the sites above the smooth surface.

18. A method according to claim 16 in which said bulge forming step comprises the step of forming the bulges also in the dielectric material underlying the conductors.

19. A method according to claim 16 further comprising the step of configuring the bulges in a pattern which extends across said conductors and which consists of a group of paths selected from a path disposed linearly at an angle to the conductors, a path disposed linearly and normally to the conductors, a path disposed linearly and diagonally to the conductors, a path disposed as a plurality of lines being angularly disposed to one another and to the conductors, and a curved path traversing the conductors.

17. A method for providing electrical interconnects in at least two flat electrical circuits, each having electrical conductors encapsulated in dielectric material and a substantially uniformly smooth surface, in which the conductors have sites defining the positions of the electrical interconnects and being free from the dielectric material on at least that conductor surface portion which is closest to the smooth surface of its circuit and the circuit adjacent thereto, comprising the steps of:

forming supported bulges in the smooth surface at the sites in the conductors and any underlying dielectric material for elevating those portions of the conductors, which are free from dielectric material, at the sites above the smooth surface;

configuring the bulges of each of the circuits with interfittable concave and convex shaped portions for enabling the bulges of each of the circuits to interfit in electrical contact with one another of the bulges;

stacking the circuits together in such a manner as to interfit the respective bulge portions thereof, thereby forming a stacked circuit arrangement; and

fitting a support into the concave portions at an outer face of the arrangement for supporting the interfitted portions of the bulges.