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Ultra fine line cable and a method for fabricating the same

  • US 4,992,059 A
  • Filed: 12/01/1989
  • Issued: 02/12/1991
  • Est. Priority Date: 12/01/1989
  • Status: Expired due to Fees
First Claim
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1. A method of fabricating an elongated cable having closely spaced lines for interconnecting spaced apart integrated circuits comprising a plurality of closely spaced elongated planar first conductor lines in a first plane insulatingly spaced from at least one elongated planar second circuit line with contact posts extruding from opposed ends of each of the first conductor lines and from opposed ends of the at least one planar second conductor line, which method comprises the steps of:

  • (a) fabricating a first cable panel by depositing upon a first layer of conductive material having two opposed ends a plurality of raised electrically conductive closely spaced elongated planar first conductor lines of a known length having first and second ends and also depositing upon the first base layer at least a pair of electrically conductive vertical connecting pillars extending above the planar first conductor lines, each of the pillars of a pair positioned near each opposed end of the first base layer and positioned beyond the ends of the first conductor lines;

    (b) fabricating a second cable panel by depositing at least one raised electrically conductive elongated planar second conductor line upon a second base layer of conductive material, the second conductor line being of a length at least equal to the distance between opposing pairs of vertical pillars of the first cable panel;

    (c) laminating the first cable panel to the second cable panel with a thin flexible laminate insulating material being disposed therebetween with the vertical pillars extending through the laminate to electrically contact opposite ends of the second conductor line;

    (d) removing selected areas of the first base layer of conductive material to expose the ends of the first conductor lines and the ends of the vertical pillars and to simultaneously provide the necessary electrical conduction for electrolytical deposition upon the first conductor line ends and the vertical pillar ends;

    (e) electrolytically depositing vertical contact posts of conductive material upon the exposed ends of the first conductor lines and the exposed ends of the pillars;

    (f) removing the remaining portion of the first conductive base layer to electrically insulate the contact posts and the first conductor lines;

    (g) removing the second conductive base layer;

    (h) disposing a layer of electrical insulation upon the exposed surfaces of the laminated first and second cable panels and permitting the contact posts to protrude through the layer to provide electrical access to the flexible cable.

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