Laminated bus bar with dielectric ceramic inserts
First Claim
1. A laminated bus bar comprisinga pair of flat, metal, strip conductors, each having a plurality of circuit-connecting projections extending from at least one edge thereof,a first layer of dielectric insulation laminated between and electrically insulating said conductors one from the other,additional layers of dielectric insulation laminated over and enclosing the outside surfaces of said conductors except in the areas of said circuit-connecting projections,a ceramic insert incorporated in said first layer of insulation and operative significantly to increase the capacitance of said conductors,at least three of said conductor strips being laminated together within said additional layers of insulation, and with one of said first layers of insulation being laminated between each pair of adjacent conductors,each of said first layers of insulation having therein a plurality of longitudinally spaced openings and each of said openings having one of said inserts secured therein with opposite sides of said insert engaged with the confronting surfaces of the two conductors which flank the respective first layer of insulation, andmeans connecting at least certain of the projections on one of a first pair of said conductors with certain of the projections on the other of said first pair of conductors thereby further to increase the capacitance as between said first pair of conductors and a third conductor in said bar.
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Accused Products
Abstract
The capacitance of the laminated bar is substantially increased by separating each pair of conductors by a thin, flexible layer of dielectric insulation which has incorporated in an opening therein a thin, wafer-like dielectric ceramic insert, which may comprise a barium titanate composition forming a thin substrate opposite sides of which are metalized, or coated with a thin layer of metal. The strip of insulation is partially cured after the placement of the insert into its openings, thereby to cause part of the resin coating on the insulation to flow into engagement with, and to fix the insert in, the opening in the insulation. This permits the partially cured insulation to be manipulated during its incorporation into a bus bar assembly where it is interposed between two strip conductors. The assembly is thereafter laminated in a dielectric jacket in such manner that opposite sides of each dielectric ceramic insert will be engaged with the confronting surfaces of adjacent conductors. Any number of inserts may be employed in each layer of insulation which separates adjacent conductors; and alternate conductors, by way of example, can be connected to each other through the agency of their projecting terminals or tabs in order selectively to increase the capacitance between various conductors in a bar.
25 Citations
7 Claims
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1. A laminated bus bar comprising
a pair of flat, metal, strip conductors, each having a plurality of circuit-connecting projections extending from at least one edge thereof, a first layer of dielectric insulation laminated between and electrically insulating said conductors one from the other, additional layers of dielectric insulation laminated over and enclosing the outside surfaces of said conductors except in the areas of said circuit-connecting projections, a ceramic insert incorporated in said first layer of insulation and operative significantly to increase the capacitance of said conductors, at least three of said conductor strips being laminated together within said additional layers of insulation, and with one of said first layers of insulation being laminated between each pair of adjacent conductors, each of said first layers of insulation having therein a plurality of longitudinally spaced openings and each of said openings having one of said inserts secured therein with opposite sides of said insert engaged with the confronting surfaces of the two conductors which flank the respective first layer of insulation, and means connecting at least certain of the projections on one of a first pair of said conductors with certain of the projections on the other of said first pair of conductors thereby further to increase the capacitance as between said first pair of conductors and a third conductor in said bar.
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3. A strip of dielectric insulation for use in making laminated electrical bus bars, condensers, and the like comprising
a thin, flexible, dielectric layer of plastic having at least one opening therein, and having thereon a partially cured resin coating, a thin, ceramic insert which is similar in configuration to, and slightly smaller than, said opening, and means securing said insert in said opening and in substantially coplanar registry with said layer of plastic, said means comprising a portion of said resin coating which has been caused to flow into fixing engagement with marginal edge portions only of said insert.
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6. A method of manufacturing a high capacitance laminated bus bar, comprising
preparing from a resin-coated layer of plastic, dielectric material a thin, flexible strip of insulation having at least one opening therein, securing a thin, wafer-like dielectric ceramic insert in said opening, placing said strip between two metal strip conductors to insulate said conductors from each other, and laminating said conductors in a plastic insulating jacket, and with opposite sides of said insert secured against the confronting surfaces of said conductors, said insert being secured in said opening by partially curing said strip before its assembly with said conductors, thereby to cause part of said coating to flow into fixing relation relative to said insert to secure the latter in said opening in generally coplanar relation to said strip.
Specification