Mounting substrate and its production method, and printed wiring board having connector function and its connection method

• US 5,019,944 A
• Filed: 05/25/1989
• Issued: 05/28/1991
• Est. Priority Date: 08/31/1988
• Status: Expired due to Term

• Current Assignee: Mitsui Mining and Smelting Company Limited
• Original Assignee: Mitsui Mining and Smelting Company Limited
• Inventors: Tanaka, Yoshitaka, Ishii, Masahito, Kataoka, Tatsuo
• Primary Examiner(s): Picard, Leo P.
• Assistant Examiner(s): Korka, Trinidad
• Application Number:
  US07/357,030
• Time in Patent Office: 733 Days
• Field of Search: 174/260, 174/259, 361/400, 361/408, 361/405, 361/406
• US Class Current: 361/783
• CPC Class Codes: H01R 4/04 using electrically conductive adhesives
• CPC Class Codes: H05K 1/181 associated with surface mounted components
• CPC Class Codes: H05K 2201/10977 Encapsulated connections applying non-metallic protective coatings for encapsulating mounted components H05K3/284
• CPC Class Codes: H05K 2203/0278 Flat pressure, e.g. for connecting terminals with anisotropic conductive adhesive
• CPC Class Codes: H05K 2203/0307 Providing micro- or nanometer scale roughness on a metal surface, e.g. by plating of nodules or dendrites
• CPC Class Codes: H05K 2203/0723 Electroplating, e.g. finish plating
• CPC Class Codes: H05K 3/102 by bonding of conductive powder, i.e. metallic powder H05K3/12 takes precedence
• CPC Class Codes: H05K 3/305 Affixing by adhesive
• CPC Class Codes: H05K 3/321 by conductive adhesives
• CPC Class Codes: H05K 3/325 by abutting or pinching, i.e. without alloying process; mechanical auxiliary parts therefor adaptations of leads inserted in holes for press-fit connections H05K3/308
• CPC Class Codes: H05K 3/361 Assembling flexible printed circuits with other printed circuits
• 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

Abstract

This invention relates to a mounting substrate onto which components such as an IC chip are to be mounted, its production method, and a printed wiring board having a connector function suitable for a fine pitch and its connection method. Metal nodules are formed on conductors of connection portions by electrodeposition, or the like. Connection is made by fixing connection portions by an adhesive. Good conduction can be secured through the metal nodules and good insulation can be held between adjacent conductors.

Claims

1. A mounting substrate comprising a substrate having formed thereon a conductor circuit, components connected electrically to said circuit and mounted onto said substrate, wherein each electrical connection portion of said circuit has a large number of metal nodules formed on said conductor by plating thereon, the nodules-formed connection portions and the mating connection portions of said components are fixed by an adhesive provided therebetween, whereby said circuit and said components are mechanically connected to each other and electrically connected to one another via the nodules.

2. The mounting substrate according to claim 1 wherein said metal nodules are dendrites formed by electrodeposition.

3. The mounting substrate according to claim 1 wherein said metal nodules are needle-like precipitates formed by non-electrolytic plating.

4. The mounting substrate according to claim 1, wherein said adhesive covers said circuit of said substrate and functions also as a coating which protects the circuit pattern.

5. The mounting substrate according to claim 1, wherein said adhesive is a film-like laminated adhesive.

6. The mounting substrate according to claim 1, wherein said adhesive covers as a whole said circuit of said substrate.

7. The mounting substrate according to claim 1, wherein said metal nodules are formed only at said connected portions of said circuit, and predetermined portions other than said connection portions have a coating thereon.

8. The mounting substrate according to claim 7, wherein said components include an IC chip.

9. A printed wiring board comprising at least one connection terminal portion to be connected to at least one printed circuit board and having an electrical connector function, said connection terminal portion having a conductor, a large number of metal nodules formed by plating on each of the conductor surfaces of said at least one connection terminal portion.

10. The printed wiring board having a connector function according to claim 9, wherein said metal nodules are dendrites formed by electrodeposition.

11. The printed wiring board having a connector function according to claim 9, wherein said metal nodules are needle-like precipitates formed by non-electrolytic plating.

12. The printed wiring board having a connector function according to claim 9, wherein an adhesive is coated on the nodules-formed conductor surfaces.

13. The printed wiring board having a connector function according to claim 10, wherein an insulation layer which prevents formation of metal nodules on the side surfaces of the conductors of said at least one connection terminal portion is disposed between adjacent conductors of said connection terminal portion.

14. A printed wiring board having a connection function according to claim 9, wherein said printed wiring board is a single surface printed wiring board.

15. A printed wiring board having a connection function according to claim 9, wherein said printed wiring board is a double surface printed wiring board.