Electric connecting terminal for electrically connecting objects

• US 9,966,685 B2
• Filed: 02/24/2017
• Issued: 05/08/2018
• Est. Priority Date: 08/07/2015
• Status: Active Grant

• Current Assignee: Joinset Co., Ltd.
• Original Assignee: Joinset Co., Ltd.
• Inventors: Kim, Sun-Ki, Park, Kee-Han
• Primary Examiner(s): DINH, PHUONG K
• Application Number:
  US15/441,570
• Publication Number:
  US 20170162972A1
• Time in Patent Office: 438 Days
• Field of Search: 361578, 361804, 439 66, 174138 G, 174138 D
• CPC Class Codes: H01R 12/714 with contacts abutting directly the printed circuit; Button contacts therefore provided on the printed circuit
• CPC Class Codes: H01R 13/03 characterised by the material, e.g. plating, or coating materials
• CPC Class Codes: H01R 13/2421 using coil springs

Abstract

An electric connecting terminal for use by interposing between electric conductive objects to electrically connect the objects to each other, the electric connecting terminal including a spring of a metallic material, and a contact part having electric conductivity, which is formed by being adhered to at least one end of the spring and configured to electrically contact the object, wherein the contact part is formed such that an electric conductive material in which a liquid polymer resin is mixed with metallic powder, is cured while enveloping the end of the spring, or is cured after flowing into an end hole formed in the spring.

Claims

1. An electric connecting terminal for use by interposing between electric conductive objects to electrically connect the objects to each other, the electric connecting terminal comprising:

a spring of a metallic material; and

a contact part having electric conductivity, which is adhered to at least one end of the spring and configured to electrically contact the object,

wherein the contact part is formed such that a liquid electric conductive material, which is formed with a liquid polymer resin mixed with metallic powder, is cured while enveloping the end of the spring, or is cured after flowing into an end hole formed in the spring.

2. The electric connecting terminal of claim 1, wherein one end of the spring is enveloped with the electric conductive material by dipping, or the electric conductive material is flowed into the end hole of the spring by impregnation.

3. The electric connecting terminal of claim 1, wherein the polymer resin has heat resistance that a soldering condition is satisfied and is one of an epoxy resin, a polyimide resin, or an elastic rubber, and

the contact part is adhered to the one end of the spring by curing of the polymer resin.

4. The electric connecting terminal of claim 1, wherein a solderable metallic plating layer is formed on outer surfaces of the spring and contact part.

5. The electric connecting terminal of claim 4, wherein the metallic metal layer is formed by sequentially plating nickel/gold or nickel/palladium (Pd).

6. The electric connecting terminal of claim 1, wherein hardness or strength of the contact part is smaller than that of the spring.

7. The electric connecting terminal of claim 1, wherein an end surface of the contact part is formed to be a flat surface by grinding and a portion of the spring is exposed from the end surface by the grinding.

8. The electric connecting terminal of claim 1, wherein the spring is configured of an elastic part, of which a middle part is wound with a constant pitch, and a supporting part formed by being wound to at least one end of the elastic part, and

the supporting part corresponds to the contact part and is configured of adjacent turns contacting each other.

9. The electric connecting terminal of claim 8, wherein a sum of height of the supporting part is smaller than a height of the elastic part.

10. The electric connecting terminal of claim 1, wherein a shape of the contact part is one of a cave-in shape toward a center in a hemisphere shape and a protrusion shape.

11. The electric connecting terminal of claim 1, wherein the contact part formed at the one end of the spring is formed of any one of an electric conductive epoxy resin or a polyimide resin, and the contact part formed at another end is formed of an electric conductive silicone rubber, and

the contact part at the one end is fixed by soldering to the object, and the contact part at the other end contacts the object by a physical pressure.

12. The electric connecting terminal of claim 1, wherein the contact part is formed of any one of an electric conductive epoxy resin or a polyimide resin.

13. The electric connecting terminal of claim 1, wherein an end of the spring at which the contact part is not formed is fixed by soldering to the object.

14. The electric connecting terminal of claim 1, wherein the contact part is formed at one end of the spring, and

another end of the spring is accommodated in a holder cup of a metallic material to be coupled thereto.

15. The electric connecting terminal of claim 14, wherein the other end of the spring has an electric conductive adhesive intervened to be adhered to a bottom of the holder cup.

16. The electric connecting terminal of claim 15, wherein the electric conductive adhesive comprises an electric conductive polymer resin and a solder.

17. The electric connecting terminal of claim 14, wherein an opening edge of the holder cup is bended inside to form a flange and the flange is formed to have a width to be overlapped with the spring.

18. The electric connecting terminal of claim 17, wherein the flange receives an elastic recovery force by the spring accommodated inside the holder cup.

19. The electric connecting terminal of claim 14, wherein a bottom surface of the holder cup has an inclined surface of a shape that caves in from an edge toward the center.

20. The electric connecting terminal of claim 14, wherein a hole is formed at a center of the bottom surface of the holder cup and a rib protrudes inside the holder cup at a constant height.

21. The electric connecting terminal of claim 14, wherein an opening edge of the holder cup is bended outward to form a protrusion.

22. The electric connecting terminal of claim 14, wherein a solderable metallic plating layer is formed on the spring, an outer surface of the contact part and the holder cup.

23. The electric connecting terminal of claim 14, wherein the contact part is vacuum-picked up to be surface-mounted and a bottom surface of the holder cup is fixed by reflow soldering to the object.

24. The electric connecting terminal of claim 14, wherein a height of the holder cup is a half of or smaller than that of the spring.

25. The electric connecting terminal of claim 1, wherein the electric connecting terminal is reel-taped on a carrier.

26. The electric connecting terminal of claim 1, wherein the electric connecting terminal is fixed by soldering or put into a socket for test to be fixed.

27. An electric connecting terminal, which is to be interposed between electric conductive objects to electrically connect the objects to each other, the electric connecting terminal comprising:

an elastic coil spring of a metallic material;

a cap of a metallic material with an electric conductive adhesive disposed at one end of the spring to be adhered; and

a holder cup of a metallic material configured to be electrically connected to another end of the spring,

wherein a height of the holder cup is a half of or smaller than that of the spring and a solderable plating layer is formed on an outer surface of the holder cup.

28. An electric connecting terminal, which is to be interposed between electric conductive objects to electrically connect the objects to each other, the electric connecting terminal comprising:

an elastic coil spring of a metallic material;

a cap of a metallic material with an electric conductive adhesive disposed at one end of the spring to be adhered; and

a contact part having electric conductivity, which is adhered to another end of the spring and fixed by soldering to the object,

wherein the contact part is formed such that an electric conductive material in which a liquid polymer resin is mixed with metallic powder, is cured while enveloping the end of the spring, or is cured after flowing into an end hole formed in the spring.