Electric contact and an electric connector both using resin solder and a method of connecting them to a printed circuit board

• US 6,717,065 B2
• Filed: 04/01/2002
• Issued: 04/06/2004
• Est. Priority Date: 03/30/2001
• Status: Expired due to Fees

• Current Assignee: JST Manufacturing Company Limited
• Original Assignee: JST Manufacturing Company Limited
• Inventors: Miyazawa, Masaaki, Hosaka, Taiji
• Primary Examiner(s): Cuneo, Kamand
• Assistant Examiner(s): Alcala, Jose H.
• Application Number:
  US10/114,775
• Publication Number:
  US 20020139574A1
• Time in Patent Office: 736 Days
• Field of Search: 174/250, 174/251, 174/254, 174/257, 174/259, 174/261
• US Class Current: 174/259
• CPC Class Codes: H01R 12/57 surface mounting terminals
• CPC Class Codes: H01R 13/03 characterised by the material, e.g. plating, or coating materials
• CPC Class Codes: H01R 2103/00 Two poles
• CPC Class Codes: H01R 24/50 mounted on a PCB [Printed Circuit Board]
• CPC Class Codes: H01R 4/02 Soldered or welded connections H01R4/625, H01R4/723, H01R12/59 take precedence
• CPC Class Codes: H05K 13/0465 by soldering H05K13/0469 takes precedence
• CPC Class Codes: H05K 2201/0129 Thermoplastic polymer, e.g. auto-adhesive layer; Shaping of thermoplastic polymer
• CPC Class Codes: H05K 2201/0215 Metallic fillers
• CPC Class Codes: H05K 2201/10909 Materials of terminal, e.g. of leads or electrodes of components
• CPC Class Codes: H05K 2203/0425 Solder powder or solder coated metal powder
• CPC Class Codes: H05K 2203/065 Binding insulating layers without adhesive, e.g. by local heating or welding, before lamination of the whole PCB
• CPC Class Codes: H05K 2203/1115 Resistance heating, e.g. by current through the PCB conductors or through a metallic mask
• CPC Class Codes: H05K 3/3426 characterised by the leads
• CPC Class Codes: H05K 3/3442 having edge contacts, e.g. leadless chip capacitors, chip carriers
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

An electric contact using resin solder is connected to a printed circuit board, which has a conductor provided on a surface thereof. This electric contact comprises a leg, which contacts the conductor of the printed circuit board, and a connecting part, which is connected to the conductor of the counterpart member. At least a part of the leg, which contacts the conductor of the printed circuit board, is made of a lead-free ultrahigh-conductive plastic being a conductive resin composite. An electric connector includes the electric contact and an insulating housing, which holds the electric contact so that the part of the leg, which contacts the conductor of the printed circuit board, is exposed.

Claims

1. An electric contact using resin solder, which is connected to a printed circuit board, which has a conductor being provided on a surface thereof,

the electric contact comprising a leg, which contacts the conductor of the printed circuit board, and a connecting part, which is connected to a conductor of a counterpart member, and

at least a part of the leg, which contacts the conductor of the printed circuit board, is made of a lead-free ultrahigh-conductive plastic being a conductive resin composite, comprising a thermoplastic resin, a lead-free solder that can be melted in the plasticated thermoplastic resin, and powder of a metal that assists fine dispersion of the lead-free solder in the thermoplastic resin or a mixture of the powder of the metal and short fibers of a metal.

2. An electric contact using resin solder as recited in claim 1, wherein

the counterpart member is an electric contact, and the connecting part is formed to fit with the connecting part of the counterpart electric contact.

3. An electric contact using resin solder as recited in claim 1, wherein

the counterpart member is a counterpart printed circuit board, which has a conductor being provided on a surface thereof, and the connecting part is formed to contact the conductor of the counterpart printed circuit board.

4. An electric contact using resin solder as recited in claim 1, wherein

the counterpart member is an electric wire, and the connecting part is formed to be connected to the electric wire.

5. A method of connecting the electric contact using resin solder of claim 1 to the printed circuit board, the method comprising

making the leg of the electric contact using resin solder contact the conductor of the printed circuit board, and passing electricity between the electric contact and the conductor of the printed circuit board to melt the lead-free solder being contained in the leg and connect the electric contact to the conductor.

6. A method of connecting the electric contact using resin solder of claim 2 to the printed circuit board, the method comprising

making the leg of the electric contact using resin solder contact the conductor of the printed circuit board, and passing electricity between the electric contact and the conductor of the printed circuit board to melt the lead-free solder being contained in the leg and connect the electric contact to the conductor.

7. A method of connecting the electric contact using resin solder of claim 3 to the printed circuit board, the method comprising

making the leg of the electric contact using resin solder contact the conductor of the printed circuit board, and passing electricity between the electric contact and the conductor of the printed circuit board to melt the lead-free solder being contained in the leg and connect the electric contact to the conductor.

8. A method of connecting the electric contact using resin solder of claim 4 to the printed circuit board, the method comprising

making the leg of the electric contact using resin solder contact the conductor of the printed circuit board, and passing electricity between the electric contact and the conductor of the printed circuit board to melt the lead-free solder being contained in the leg and connect the electric contact to the conductor.

9. An electric connector using resin solder comprising

the electric contact using resin solder of claim 1, and an insulating housing, which holds the electric contact.

10. An electric connector using resin solder comprising

the electric contact using resin solder of claim 2, and an insulating housing, which holds the electric contact.

11. An electric connector using resin solder comprising

the electric contact using resin solder of claim 3, and an insulating housing, which holds the electric contact.

12. An electric connector using resin solder comprising

the electric contact using resin solder of claim 4, and an insulating housing, which holds the electric contact.

13. An electric connector using resin solder as recited in claim 9, wherein

the insulating housing is made of a thermoplastic resin, and the electric contact and the insulating housing are molded integrally.

14. An electric connector using resin solder as recited in claim 10, wherein

the insulating housing is made of a thermoplastic resin, and the electric contact and the insulating housing are molded integrally.

15. An electric connector using resin solder as recited in claim 11, wherein

the insulating housing is made of a thermoplastic resin, and the electric contact and the insulating housing are molded integrally.

16. An electric connector using resin solder as recited in claim 12, wherein

the insulating housing is made of a thermoplastic resin, and the electric contact and the insulating housing are molded integrally.

17. A method of connecting the electric connector using resin solder of claim 9 to the printed circuit board, the method comprising

making the leg of the electric contact using resin solder contact the conductor of the printed circuit board, and passing electricity between the electric contact and the conductor of the printed circuit board to melt the lead-free solder being contained in the leg and connect the electric contact to the conductor.