Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Patent
1996-04-19
1998-06-09
Picard, Leo P.
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
361760, 361807, 361808, 361777, 257773, 257774, 257779, 257737, 257738, 22818021, 22818022, 174263, 174255, 174261, 174262, 174266, H05K 702
Patent
active
057644853
ABSTRACT:
A special so called BLOCKADE-Via.TM. apparatus and technique for more efficient circuiting and assembly of electronic components on a multilayer parallel-conductivity "printed-circuit board" employing high-density conductor-pins and solder-ball construction. A BGA(ball-grid array) component may be placed upon pads employing a array of special blocked-vias, thereby enabling any given ML/PCB design to option other circuit-path routings from each individual via pad. A special via cap is set forth, which may be employed in combination with a special occluding lower-layer of the ML/PCB substrate. Thus, additional discrete circuiting may also be installed upon the opposite side of the ML/PCB, an advantageous function facilitating assembly of two or more parallel-layered circuits, whereby former offset open-vias can be eliminated by employment of a special array of vias drilled to selective depths vertically-aligned directly below the BGA pads for example. Volume assembly processing of this special ML/PCB is easily handled by existing production-facility equipment and procedures;--the resulting blocked-vias being less critical to make, exhibit superior conductivity, while offering approximately 30% greater via density (or conversely, ML/PCB area-reduction). The disclosure also features a special high-efficiency hexagonally shaped via-pad having honeycomb interstitial spacing; as well as a special crisscrossed via-pad for improved electrical flow.
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Applicant's Prior PTO/Disclosure Document #390,635/filed 22 Feb. 1996.
Foster David
Picard Leo P.
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