Sheldahl, Inc.

Brent N Sweitzer

Eugene T Selbitschka

Sidney J Roberts

Glenn W Gengel

A metallized laminate material for the manufacture of high performance, high density printed wiring boards and the like includes an ordered distribution of via holes electrically interconnecting opposing conductive layers on a dielectric polymeric film substrate. Furthermore, opposing photoresist layers substantially cover the conductive layers and vias. The conductive material in the conductive layers and the vias is bonded adhesivelessly to the substrate to provide a high degree of delamination resistance. The production of metallized laminate material is preferably carried out in a roll-to-roll process suitable for high volume, low cost production. In use, an end user may manufacture customized printed wiring boards in small volume runs from the laminate material with a reduced amount of equipment, expertise and cost.

Metallized laminate material having ordered distribution of conductive

A printed circuit assembly and a method of manufacturing therefor are provided for directly connecting unpackaged integrated circuit chips such as flip chips to a footprint of active contact pads on a printed circuit substrate. A reduction in packaging density is obtained by electrically interconnecting one or more of the active contact pads with circuit traces formed on different layers of the printed circuit substrate. In a preferred embodiment, at least one of the active contact pads includes an electrically conductive through hole electrically connecting the contact pad and a circuit trace located on the back side of a double-sided printed circuit substrate. In another embodiment, the printed circuit substrate is a multilayer construction, which enables active contact pads to be electrically interconnected with circuit traces on a plurality of circuit layers.

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Nerstrand, MN, United States of America

Brent N Sweitzer