Metal working – Method of mechanical manufacture – Electrical device making
Patent
1997-11-17
1999-11-30
Arbes, Carl J.
Metal working
Method of mechanical manufacture
Electrical device making
29852, 430312, 430313, 430314, H05K 336
Patent
active
059920122
ABSTRACT:
In the manufacture of Printed Circuit (PC) boards, conductors are placed in a base layer of glass cloth. The conductors penetrate the thickness of the cloth and can be arranged to form a matrix or grid. The arrangement of cloth and conductors is then cured with resin with the wire lengths disposed within the cured board core. The wire lengths can be made flush with the board core surfaces and become the electrical conductors between circuitry on such surfaces. In one embodiment, the wire is removed leaving a finished hole ready for standard through-hole plating. These finished circuit boards can be stacked and laminated forming through, blind, or buried vias. One or more finished circuit boards with imbedded vias can be used as circuitry redistribution layers to avoid dense circuit patterns in applications such as in flip-chip mounting of integrated circuit chips. In another embodiment, the conductors are imbedded in the glass cloth with sufficient density to form a composite thick conductor. Other layers can then be laminated or built up on this composite and multiple vias can then be formed to the thick conductor using conventional techniques.
REFERENCES:
patent: 4566186 (1986-01-01), Bauer et al.
patent: 4642889 (1987-02-01), Grabbe
patent: 4643935 (1987-02-01), McNeal et al.
patent: 4648179 (1987-03-01), Bhattacharyya et al.
patent: 5679498 (1997-10-01), Greenwood et al.
Arbes Carl J.
LSI Logic Corporation
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