# US 4,400,234 A · Method of manufacturing electrical connector

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- Number: US 4,400,234 A
- Document ID: US4400234A
- Status: Granted
- Kind: A
- Application number: 06/368,795
- Filed: 1982-04-15
- Granted: 1983-08-23
- Earliest claimed: 1975-11-13
- Assignees: Tektronix, Inc.
- Inventors: William E. Berg
- Web page: https://patentgrep.com/patent/US4400234A

## CPC

- H05K 7/1061: {co-operating by abutting}
- H01H 1/24: with resilient mounting
- H05K 3/325: by abutting or pinching; Mechanical auxiliary parts therefor
- H05K 1/0237: {High frequency adaptations (H05K1/0216 takes precedence)}
- H05K 2201/0314: Elastomeric connector or conductor, e.g. rubber with metallic filler
- H05K 2201/10393: Clamping a component by an element or a set of elements
- H05K 2201/10681: Tape Carrier Package [TCP]; Flexible sheet connector
- Y10T 29/49217: by elastic joining
- Y10T 29/4922: with molding of insulation
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

This disclosure describes an electrical connector for joining microcircuit or microcircuit modules, such as leadless integrated or hybrid circuit carriers to utilization means, such as printed or etched circuit boards or similar means. The electrical contacts through which the microcircuit and utilization means are connected are formed and etched in place on an elastomeric material, precisely located; the material acting as a restoring force to maintain connection. The connector when used in a system maintains transmission line mediums in a single environment.

## Claims

### Claim 1

The process of securing metal contacts to elastomeric material comprising:
using a metal having mild spring characteristics and medium yield strength;
subjecting said metal to a photo process for forming said contacts; injecting an elastomeric material onto said photo processed metal according to a generated pattern at a temperature above room temperature;
outgassing the injected material and metal by baking at a temperature above room temperature; and
etching the outgassed injected material and metal to remove excess material leaving the metal contacts secured to the elastomeric material.

### Claim 2 (depends on 1)

A process according to claim 1 further comprising a step of annealing said processed metal after said photo processing to make said metal ductile; and
preforming said ductile metal to a desired form.

### Claim 3 (depends on 1)

A process according to claims 1 wherein said metal has a thickness of 0.001 to 0.003, preferably 0.0020 mils thick.

### Claim 4 (depends on 1)

The process according to claim 1 wherein said etching includes using gold as a resist.

### Claim 5 (depends on 1)

The process according to claim 1 wherein said photo process includes the steps of:
(a) cleaning said metal;
(b) apply resist to said metal;
(c) laying a contact pattern in contact with said resist;
(d) plating a metal or metals in said contact pattern, said metals selected from the group consisting of nickel, gold or/and alloy thereof;
(e) removing said resist according to said pattern;
(f) etching said remaining metal to clean same; and
(g) priming said etched metal remaining after partial etching.

### Claim 6

A method of manufacturing an electrical contact defining a metallic element fixed to a supporting elastomeric element, said method comprising the steps of:
(a) defining a contact area on one surface of a sheet of metallic material;
(b) molding an elastomeric material onto another surface of said sheet material opposite that defining said contact area;
(c) removing from said elastomeric material that portion of said metallic material not defining said contact area.

### Claim 7 (depends on 6)

The method of claim 6 wherein said step (a) includes the step of plating said surface of said metallic material with a second metallic material, the outline of which defines said contact area.

### Claim 8 (depends on 6)

The method of claim 6 further comprising, after step (a) and before (b), the additional step of forming said sheet material, and thereby said contact area, into a non-planar configuration, and wherein said step (b) includes causing one surface of said elastomeric material to assume a configuration conforming to that of said other surface of said sheet material.

### Claim 9 (depends on 8)

The method of claim 8 wherein said additional step includes forming said contact area into a configuration defining in cross section a concave portion interposed between two convex portions.

### Claim 10 (depends on 6)

The method of claim 6 wherein said step (b) includes placing said sheet material in a die within a transfer molding machine and injection molding said elastomeric material into securing contact with said other surface of said sheet material.

### Claim 11 (depends on 8, 9, 10)

The method of any one of claims 8-10 wherein the term "contact area" refers to a plurality of contact areas.

### Claim 12 (depends on 6)

The method of claim 6 wherein said step (c) includes etching away said metallic material not defining said contact area.

### Claim 13 (depends on 6)

The method of claim 6 wherein said sheet material has a thickness dimension in the range from 0.0015 to 0.0025 mils.