Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1991-03-06
1993-06-15
Ryan, Patrick J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428901, 174262, 174264, 174261, B32B 900
Patent
active
052196399
ABSTRACT:
A multilayer structure of the invention is fabricated by patterning a first electrically conductive layer on an insulative substrate; coating a polyamic acid resin layer all over the first electrically conductive layer; piercing a metal pin into the resin layer so that a first end of the pin contacts and is cold-welded to the first electrically conductive layer; hardening said polyamic acid resin to become polyimide resin; and patterning a second electrically conductive layer over the resin layer and the second end of the pin exposed from the surface of the resin layer. The cold-welding of the pin to the first conductive layer allows a reliable connection thereof. Moreover, this structure and method allow an improved flatness of each layer, resulting in an achievement of a larger number of the multilayers without the prior art problem of pattern breakage caused from less flat layers. The polyimide resin, which is not required to be photosensitive in the above fabrication method, can be employed so that its thermal expansion coefficient is same as the pin. Accordingly, no thermal stress is generated at the connection between the pin and the second conductive layer, resulting in an improved reliability of the connection.
REFERENCES:
patent: 3921285 (1975-11-01), Krall
patent: 4328531 (1982-05-01), Nagashima et al.
patent: 4736521 (1988-04-01), Dohya
Research Disclosure, "Dendrite Connectors for Low Temperture System Packaging", No. 309, p. 44, abstract No. 30964, Jan. 1990.
Satoh Kazuaki
Sugawara Noritoshi
Fujitsu Limited
Lee Cathy K.
Ryan Patrick J.
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