Printed wire boards and method of making same
AssigneeAMP-Akzo LinLim VOF
InventorsErik Middelman, Pieter H. Zuuring
Life of this patent
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Abstract
A laminate, adapted to be used as a supporting board for a printed circuit, is disclosed which comprises layers of an electrically non-conductive matrix material reinforced with unidirectionally (UD) oriented fibers with the layers comprising individual matrix material having different directions of orientation. The layers are stacked to form a laminate of crossing layers, and the laminate has a core plane relative to which the crossing layers are in mirror image relationship so that the laminate has orthotropic properties. The laminate comprises layers of adhesive material present at least between any pair of layers of UD-reinforced matrix material having different directions of orientation.
Claims16
A laminate, adapted to be used as a supporting board for a printed circuit, comprising layers of an electrically non-conductive matrix material reinforced with unidirectionally (UD) oriented fibers which layers comprise individual matrix material having different directions of orientation and the layers being stacked to form a laminate of crossing layers, the laminate having a core plane relative to which the crossing layers are in mirror image relationship so as to obtain orthotropic properties for the laminate and comprising layers of adhesive material present at least between any pair of layers of UD-reinforced matrix material having different directions of orientation.
A laminate having a thickness of x .mu.m which is adapted to be used as a supporting board for a printed circuit and which comprises layers of an electrically non-conductive matrix material reinforced with unidirectionally (UD) oriented fibers having a titer of y tex wherein the laminate has a thickness factor (T=x/y) of below 5.5 .mu.m/tex.
A method of manufacturing a base material for printed wire boards comprising the following steps:
- manufacturing an electrically non-conductive synthetic layer reinforced with unidirectionally (UD) oriented fibers, which will not be made to flow during the subsequent steps;
- single-sided or double-sided coating of at least part of the aforementioned unidirectional layer with an adhesive;
- stacking the at least partially adhesive-coated layers in such a way that there is at least one layer of adhesive between each pair of UD-reinforced layers having a different direction of orientation and practically the same amount of material of even thickness and composition is disposed in the virtually perpendicularly intersecting orientation directions;
- and
- bonding the stacked UD laminates by activating the adhesive layers.
Dependencies are inferred from the claim text.