Circuit terminations having improved electrical and structural integrity
AssigneeHughes Aircraft Company
InventorElie J. Ichkhan
Life of this patent
Estimating the term…
Abstract
Terminations (10, 40, 70, 90) for flexible printed circuitry comprises thermosetting epoxy or polyimide prepreg sheets (36, 56, 64, 88, 102) in the rigid portion, instead of thermoplastic acrylic adhesive, partial coverlays (20, 50, 84, 94) instead of full coverlays and, as desired, rigidized members of epoxy or polyimide glass (16, 52, 54, 86) or prepreg internally as well as externally of the terminations. Anchor pads 34 secured to plated-through holes (38) minimize z-axis expansion of the terminations.
Claims23
A termination for an electrical circuit with improved electrical and structural integrity comprising:
- joined layers of electrically insulating and conductive material;
- and
- at least one layer including a stiffener material of thermosetting composition,
- said layers of electrically insulating and conductive materials and said stiffener material layer including at least one substantially planarly arranged longitudinally extending layer consisting of a prepreg sheet and a coverlay sheet.
A termination for an electrical circuit with improved electrical and structural integrity comprising:
- joined layers of electrically insulating and conductive material;
- at least one layer including a stiffener material of thermosetting composition;
- plated-through holes extending through said layers;
- and
- anchor pads placed internally within the terminations and between said layers, and bonded to and extending outwardly from said plated-through holes for minimizing z-axis expansion of said joined layers.
A termination for an electrical circuit with improved electrical and structural integrity comprising:
- joined layers of electrically insulating and conductive material;
- and
- at least one layer including a stiffener material of thermosetting composition,
- said layers of electrically insulating and conductive material comprising a dielectric layer and conductive material including a perforated section secured to and extending substantially continuously across the entire breadth and length of said dielectric layer.
A termination for a flat electrical circuit comprising layers of electrically insulating and conductive material and including a dielectric layer and conductive material including a perforated section secured to and extending substantially continuously across the entire breadth and length of said dielectric layer.
A circuit termination of a lamination of electrically insulating and conductive material comprising plated-through holes extending through the lamination and anchor pads placed internally of the lamination and bonded to and extending outwardly from said plated-through holes for minimizing z-axis expansion of the lamination.
A method for fabricating an electric cable and terminations therefor comprising the steps of:
- providing a layer of electrically insulating and conductive material;
- and
- bonding a stiffener core including a thermosetting composition to the layer by
- lightly pressing the stiffener core and the layer to a prepreg sheet to form an initial bonding, and
- increasing the pressure under sufficient pressure, temperature and time to complete the bonding.
A method for fabricating an electric cable and terminations therefor comprising the steps of:
- placing a perforated shield of electrically conductive material over substantially the entire breadth and width of a dielectric sheet to form a layer therefrom;
- and
- bonding a stiffener core including a thermosetting composition to the layer.
Dependencies are inferred from the claim text.