Circuitized substrates utilizing three smooth-sided conductive layers as part thereof, method of making same, and electrical assemblies and information handling systems utilizing same
First Claim
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1. A method of making a circuitized substrate comprising:
- providing a first electrically conductive layer with first and second opposing smooth sides;
providing second and third electrically conductive layers each having a first smooth side and a second opposing side of a roughness greater than that of said first smooth sides of said second and third electrically conductive layers;
treating said first, second and third electrically conductive layers with a chemical treatment so as to minimally increase said roughness of said first and second smooth sides of said first electrically conductive layer and said first smooth sides of said second and third electrically conductive layers;
providing first and second dielectric layers;
bonding said first and second dielectric layers to said first and second opposing smooth sides of said first electrically conductive layer, respectively, after said treating of said first electrically conductive layer with said chemical treatment;
bonding said first smooth sides of said second and third electrically conductive layers to said first and second dielectric layers, respectively, after said treating of said first smooth sides of said second and third electrically conductive layers with said chemical treatment; and
forming a circuit pattern within at least one of said second and third electrically conductive layers.
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Abstract
A circuitized substrate in which three conductive layers (e.g., electroplated copper foil) are bonded (e.g., laminated) to two dielectric layers. Each of the foil surfaces which physically bond to a respective dielectric layer are smooth (e.g., preferably by chemical processing) and may include a thin, organic layer thereon. One of the conductive layers may function as a ground or voltage (power) plane while the other two may function as signal planes with a plurality of individual signal lines as part thereof. An electrical assembly and an information handling system utilizing such a circuitized substrate are also provided, as is a method of making the substrate.
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Citations
12 Claims
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1. A method of making a circuitized substrate comprising:
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providing a first electrically conductive layer with first and second opposing smooth sides; providing second and third electrically conductive layers each having a first smooth side and a second opposing side of a roughness greater than that of said first smooth sides of said second and third electrically conductive layers; treating said first, second and third electrically conductive layers with a chemical treatment so as to minimally increase said roughness of said first and second smooth sides of said first electrically conductive layer and said first smooth sides of said second and third electrically conductive layers; providing first and second dielectric layers; bonding said first and second dielectric layers to said first and second opposing smooth sides of said first electrically conductive layer, respectively, after said treating of said first electrically conductive layer with said chemical treatment;
bonding said first smooth sides of said second and third electrically conductive layers to said first and second dielectric layers, respectively, after said treating of said first smooth sides of said second and third electrically conductive layers with said chemical treatment; andforming a circuit pattern within at least one of said second and third electrically conductive layers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification