Circuit board assembly employing solder vent hole
First Claim
Patent Images
1. An electronics assembly, comprising:
- a printed circuit board having a via hole therethrough and an adjacent vent hole;
a nonconductive adhesive layer having a first surface and a second surface, the first surface coupled to the printed circuit board;
a conductive substrate coupled to the adhesive layer second surface so that the adhesive layer is disposed between the printed circuit board and the substrate, wherein the adhesive layer further has a void space overlapping the via hole and the vent hole; and
reflowed solder extending into the void space, the reflowed solder connecting the printed circuit board to the substrate.
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Abstract
A printed circuit board assembly employing a solder vent hole adjacent solder filled interconnect vias connecting to a conductive pallet, is disclosed. The solder vent hole allows gases to escape from an otherwise sealed cavity during solder reflow, relieving positive pressure and thereby allowing solder to flow into it. By providing an escape path for trapped air and gases generated during solder paste reflow, the out-gassing pressure and weight of the molten solder is sufficient to allow the solder paste to flow into the cavity.
10 Citations
17 Claims
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1. An electronics assembly, comprising:
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a printed circuit board having a via hole therethrough and an adjacent vent hole;
a nonconductive adhesive layer having a first surface and a second surface, the first surface coupled to the printed circuit board;
a conductive substrate coupled to the adhesive layer second surface so that the adhesive layer is disposed between the printed circuit board and the substrate, wherein the adhesive layer further has a void space overlapping the via hole and the vent hole; and
reflowed solder extending into the void space, the reflowed solder connecting the printed circuit board to the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9-13. -13. (canceled)
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14. An RF power amplifier circuit board assembly, comprising:
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a printed circuit board having a via hole therethrough, an adjacent vent hole therethrough, and one or more RF power transistors mounted thereon;
a nonconductive adhesive layer having a first surface and a second surface, the first surface coupled to the printed circuit board;
an electrically conductive substrate coupled to the adhesive layer second surface so that the adhesive layer lies between the printed circuit board and the substrate, wherein the adhesive layer further has a void space aligned to the via hole and vent hole;
reflowed solder extending through the via hole and the void space to the substrate, the reflowed solder electrically connecting the printed circuit board to the substrate; and
one or more conductive traces on the printed circuit board electrically connecting to the reflowed solder. - View Dependent Claims (15, 16)
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17-20. -20. (canceled)
Specification