Power core for use in circuitized substrate and method of making same
First Claim
1. A power core for use in circuitized substrates, said power core comprising:
- a first layer of a first low expansion dielectric material including first and second opposing sides and at least one opening extending there-through;
second and third layers of a second low expansion dielectric material different from said first low expansion dielectric material and positioned on said first and said second opposing sides of said first layer of low expansion dielectric material, respectively, and within said at least one opening;
first and second conductive layers positioned on said second and said third layers of said low expansion dielectric material, respectively, and not within said at least one opening; and
at least one thru hole positioned within said at least one opening and extending substantially from said first conductive layer to said second conductive layer.
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Accused Products
Abstract
A power core adapted for use as part of a circuitized substrate, e.g., a PCB or LCC. The core includes a first layer of low expansion dielectric and two added layers of a different low expansion dielectric bonded thereto, with two conductive layers positioned on the two added low expansion dielectric layers. At least one of the conductive layers serves as a power plane for the power core, which in turn is usable within a circuitized substrate, also provided. Methods of making the power core and circuitized substrate are also provided. The use of different low expansion dielectric materials for the power core enables the use of support enhancing fiberglass in one layer while such use is precluded in the other two dielectric layers, thus preventing CAF shorting problems in highly precisely defined thru holes formed within the power core.
35 Citations
29 Claims
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1. A power core for use in circuitized substrates, said power core comprising:
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a first layer of a first low expansion dielectric material including first and second opposing sides and at least one opening extending there-through; second and third layers of a second low expansion dielectric material different from said first low expansion dielectric material and positioned on said first and said second opposing sides of said first layer of low expansion dielectric material, respectively, and within said at least one opening; first and second conductive layers positioned on said second and said third layers of said low expansion dielectric material, respectively, and not within said at least one opening; and at least one thru hole positioned within said at least one opening and extending substantially from said first conductive layer to said second conductive layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A circuitized substrate comprising:
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a power core including a first layer of a first low expansion dielectric material including first and second opposing sides and at least one opening extending there-through; second and third layers of a second, different low expansion dielectric material from said first low expansion dielectric material and positioned on said first and said second opposing sides of said first layer of low expansion dielectric material, respectively, and within said at least one opening, first and second conductive layers positioned on said second and third layers of said low expansion dielectric material, respectively, and not within said at least one opening, and at least one thru hole positioned within said at least one opening and electrically isolated from said first and said second conductive layers; and a plurality of alternating layers of dielectric material and conductive material on at least one side of said power core and bonded thereto, selected ones of said layers of conductive material adapted for carrying electrical signals. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of making a power core for use in a circuitized substrate, the method comprising:
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providing a first layer of a first low expansion dielectric material including first and second opposing sides; forming at least one opening extending through said first layer of said first low expansion dielectric material from said first opposing side to said second opposing side; positioning second and third layers of a second low expansion dielectric material different from said first low expansion dielectric material on said first and said second opposing sides of said first layer of low expansion dielectric material, respectively; bonding said second and said third layers of said second low expansion dielectric material different from said first low expansion dielectric material to said first layer of said first low expansion dielectric material such that at least some of said second low expansion dielectric material of both of said second and said third layers extends within and substantially fills said at least one opening; forming first and second conductive layers on said second and said third layers of said low expansion dielectric material, respectively, and not within said at least one opening; and forming at least one thru hole within said at least one opening having said second low expansion dielectric material of both of said second and said third layers therein. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29)
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Specification