| 摘要 |
<p>The various layers of polymer plastic foil, each carrying its own conductor pattern, are bonded tog. mechanically only in those regions where holes are made for the attachment of connecting wires or plug pins and the remainder of each layer is independently flexible. Disc shaped welds are made ultrasonically around the holes using a multiple ultrasonic electrode head. To allow connections to be made to underlying layes these are deformed upwards through enlarged holes in the upper layers the tops of the truncated cones so formed lying flush with the top layer.</p> |
