Capacitor laminate for use in capacitive printed circuit boards and methods of manufacture
First Claim
1. A capacitor laminate as an intermediate product for use within a laminated capacitive printed circuit board (PCB), comprisingtwo conductive foils and one sheet of dielectric material, the conductive foils and dielectric sheet having characteristics for producing desired capacitance in combination for large numbers of PCB devices, the conductive foils and dielectric sheet each being structurally rigid entities permitting their lamination together and having surface dimensions similar to at least a substantial portion of the PCB, the conductive foils and dielectric sheet being thin to form the capacitor laminate with a uniformly thin dimension suitable for inclusion as an internal layer of the PCB, the two conductive foils being laminated onto opposite sides of the dielectric sheet to form the capacitor laminate as a structurally rigid subassembly facilitating its lamination into the PCB.
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Accused Products
Abstract
A capacitor laminate is described either as an intermediate product for use in a capacitive printed circuit board or as part of the assembled printed circuit board in order to provide a bypass capacitive function for large numbers of devices mounted or formed on the printed circuit board, the capacitor laminate being formed from sheets of conductive material and an intermediate sheet of dielectric material forming the laminated capacitor as a structurally rigid assembly and facilitating its inclusion within the PCB, components of the capacitor laminate having selected characteristics whereby each individual device is provided with capacitance by a proportional portion of the capacitor laminate and by borrowed capacitance from other portions of the capacitor laminate, the capacitive function of the capacitor laminate being dependent upon random firing or operation of the devices. Methods of manufacture for the capacitor laminate as well as the capacitive PCB are also described. The capacitor laminate of the present invention is preferably formed with preferred surface treatment or surface characteristics on the conductive foils employed therein.
209 Citations
18 Claims
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1. A capacitor laminate as an intermediate product for use within a laminated capacitive printed circuit board (PCB), comprising
two conductive foils and one sheet of dielectric material, the conductive foils and dielectric sheet having characteristics for producing desired capacitance in combination for large numbers of PCB devices, the conductive foils and dielectric sheet each being structurally rigid entities permitting their lamination together and having surface dimensions similar to at least a substantial portion of the PCB, the conductive foils and dielectric sheet being thin to form the capacitor laminate with a uniformly thin dimension suitable for inclusion as an internal layer of the PCB, the two conductive foils being laminated onto opposite sides of the dielectric sheet to form the capacitor laminate as a structurally rigid subassembly facilitating its lamination into the PCB.
Specification