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US 11,445,599 B2Granted
Printed circuit boards with non-functional features
AssigneeDell Products L.P.
InventorsUmesh Chandra, Bhyrav M. Mutnury
Life of this patent
Estimating the term…
Abstract
A multi-layer PCB has conductive vias (134) passing through multiple layers. A layer may have a conductive non-functional feature (710) physically contacting a via but not surrounding the via, to make the PCB more resistant to thermal stresses while, at the same time, reducing the parasitic capacitance compared to a prior art non-functional pad (310n).
Claims20
A printed circuit board (PCB) comprising:
- a plurality of layers each including an insulator and a portion of circuitry;
- a first hole that passes through the plurality of layers;
- and
- a conductive first via that is formed in the first hole, that includes a portion of the circuitry, and that passes through one or more of the plurality of layers,
- wherein each of the plurality of layers includes only one conductive first Non-Functional Features (NFFs) that physically contacts the first via, and wherein a respective interface between each first NFF and the first via does not completely laterally surround the first via, and
- wherein respective centerlines of consecutive first NFFs contacting the first via extend from a center axis of the first hole at different angular positions relative to each others that are separated by at most 120 degrees.
3 more elements
A printed circuit board (PCB) comprising:
- a printed circuit board;
- a first via providing a portion of the circuitry and passing through at least a portion of the printed circuit board;
- and
- a plurality of first Non-Functional Features (NFFs) that each extend from the first via but that each do not completely laterally surrounding the first via,
- wherein only one of the plurality of first NFFs extends from the first via in each of a plurality of different layers in the circuit board, and wherein respective centerlines of consecutive first NFFs extending from a central axis of the first via are located at different angular positions relative to each others that are separated by at most 120 degrees.
2 more elements
Dependencies are inferred from the claim text.