Micro-pad array to thread flexible attachment

• US 10,426,029 B1
• Filed: 01/18/2018
• Issued: 09/24/2019
• Est. Priority Date: 01/18/2018
• Status: Active Grant

• Current Assignee: Flex, Ltd.
• Original Assignee: Flex, Ltd.
• Inventors: Glickman, Michael James, LeClerc, Nicholas
• Primary Examiner(s): Thompson, Timothy J
• Assistant Examiner(s): Pizzuto, Charles
• Application Number:
  US15/874,649
• Time in Patent Office: 614 Days
• Field of Search: 174254
• CPC Class Codes: H05K 1/028 Bending or folding regions of flexible printed circuits H05K1/0283 takes precedence
• CPC Class Codes: H05K 1/0283 Stretchable printed circuits
• CPC Class Codes: H05K 1/0326 containing O
• CPC Class Codes: H05K 1/0346 containing N
• CPC Class Codes: H05K 1/111 Pads for surface mounting, e.g. lay-out
• CPC Class Codes: H05K 1/118 specially for flexible printed circuits, e.g. using folded portions
• CPC Class Codes: H05K 2201/0145 Polyester, e.g. polyethylene terephthalate [PET], polyethylene naphthalate [PEN]
• CPC Class Codes: H05K 2201/0154 Polyimide
• CPC Class Codes: H05K 2201/0158 Polyalkene or polyolefin, e.g. polyethylene [PE], polypropylene [PP]
• CPC Class Codes: H05K 2201/09409 Multiple rows of pads, lands, terminals or dummy patterns; Multiple rows of mounted components
• CPC Class Codes: H05K 2201/09445 Pads for connections not located at the edge of the PCB, e.g. for flexible circuits
• CPC Class Codes: H05K 2201/09663 Divided layout, i.e. conductors divided in two or more parts branched layout H05K2201/09254
• CPC Class Codes: H05K 2201/09709 Staggered pads, lands or terminals; Parallel conductors in different planes

Abstract

A micro-pad array to conductive wire flexible attachment assembly includes a micro-pad geometry formed on a flexible printed circuit and a method for connecting a conductive wire, thread or fiber to the micro-pad geometry.

Claims

1. A flexible attachment assembly comprising:

a. a flexible substrate;

b. an electrically conductive connection area coupled to the flexible substrate;

c. a plurality of electrically conductive micro-pads, each electrically conductive micro-pad has a first end and a second end opposite the first end, the first end is connected to the electrically conductive connection area such that the electrically conductive connection area electrically interconnects all electrically conductive micro-pads; and

d. a conductive wire, wherein a portion of the conductive wire is mechanically and electrically coupled to the second ends of the plurality of electrically conductive micro-pads, further wherein a remaining portion of the conductive wire extends beyond a footprint of the flexible substrate.

2. The flexible attachment assembly of claim 1 wherein the flexible substrate comprises one or more non-conductive layers and one or more conductive layers.

3. The flexible attachment assembly of claim 1 wherein the flexible substrate comprises one of polyimide, polyethylene teraphthalate (PET), polyethylene nitride (PEN) or polyurethane.

4. The flexible attachment assembly of claim 1 wherein the flexible substrate comprises a flexible printed circuit.

5. The flexible attachment assembly of claim 1 wherein the electrically conductive connection area comprises a continuous layer of conductive material.

6. The flexible attachment assembly of claim 5 wherein the continuous layer of conductive material comprises a metal foil sheet.

7. The flexible attachment assembly of claim 1 wherein the plurality of electrically conductive micro-pads are made of conductive paste.

8. The flexible attachment assembly of claim 7 wherein the conductive paste comprises one of a solder paste and an anisotropic conductive paste.

9. The flexible attachment assembly of claim 1 wherein each of the plurality of electrically conductive micro-pads is physically separated from each other.

10. The flexible attachment assembly of claim 1 further comprising solder coupled to the portion of the electrically conductive wire and the first end of each of the electrically conductive micro-pads.

11. The flexible attachment assembly of claim 1 further comprising electrically conductive adhesive coupled to the portion of the electrically conductive wire and the first end of each of the electrically conductive micro-pads.

12. The flexible attachment assembly of claim 1 further comprising an insulating layer applied over the flexible substrate and the electrically conductive connection area and in-between the plurality of micro pads extending from the electrically conductive connection area.

13. The flexible attachment assembly of claim 12 wherein the insulating layer comprises soldermask.

14. The flexible attachment assembly of claim 12 wherein an outer surface of the insulating layer is co-planar with an exposed surface of the second end of each micro-pad.

15. The flexible attachment assembly of claim 1 wherein the flexible substrate comprises a first surface and a second surface opposite the first surface, further wherein the electrically conductive connection area is connected to the first surface of the flexible substrate.

16. The flexible attachment assembly of claim 1 wherein the flexible substrate comprises a first surface and a second surface opposite the first surface, further wherein a cavity is formed in the first surface of the flexible substrate and the electrically conductive connection area is positioned within the cavity.

17. The flexible attachment assembly of claim 16 wherein the electrically conductive connection area has a first surface and a second surface opposite the first surface, further wherein the first surface of the electrically conductive connection area is connected to a bottom surface of the cavity, and the second surface of the electrically conductive connection area is co-planar with the first surface of the flexible substrate.

18. The flexible attachment assembly of claim 16 wherein the electrically conductive connection area has a first surface and a second surface opposite the first surface, further wherein the first surface of the electrically conductive connection area is connected to a bottom surface of the cavity, and the second surface of the electrically conductive connection area is lower than the first surface of the flexible substrate.

19. The flexible attachment assembly of claim 16 wherein the electrically conductive connection area has a first surface and a second surface opposite the first surface, further wherein the first surface of the electrically conductive connection area is connected to a bottom surface of the cavity, and the second surface of the electrically conductive connection area extends above the first surface of the flexible substrate.

20. The flexible attachment assembly of claim 1 wherein the portion of the conductive wire is aligned over a footprint of the electrically conductive connection area, and a remaining portion of the conductive wire extends beyond a footprint of the electrically conductive connection area.

21. The flexible attachment assembly of claim 1 wherein the electrically conductive connection area is a single contact pad for the portion of the conductive wire, and the plurality of electrically conductive micro-pads are all connected to the single contact pad.