Process for application of overlay conductors to surface of prin

Details Process for application of overlay conductors to surface of prin Process for application of overlay conductors to surface of prin

1987-09-30

1989-02-28

Lusignan, Michael

Coating processes

Electrical product produced

Welding electrode

427 55, 427 96, B05D 306, B05D 512

Patent

active

048084344

ABSTRACT:
The invention provides a method of applying an overlay conductor between at least a pair of connection land areas on a surface of a printed circuit board. The pattern of the conductor is first defined by the application of a dielectric material between the pair of land areas. A silver polymer ink is then applied over the dielectric material and over only a portion of each land area. The polymer ink is then cured by exposure to a source of heat. The pair of land areas and at least the portion of the cured ink overlaying the land areas are then covered with silver solder paste which is subsequently reflowed by exposure to a source of heat and allowed to solidify thereby attaching the conductor to the land area and providing a secure conductive connection.

REFERENCES:
patent: 4479983 (1984-10-01), Appelt et al.
patent: 4487811 (1984-12-01), Erchelberger et al.
patent: 4535012 (1985-08-01), Martin et al.
patent: 4704305 (1987-11-01), Berger et al.

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