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Method of producing multilayer circuit board

  • US 6,350,365 B1
  • Filed: 08/09/2000
  • Issued: 02/26/2002
  • Est. Priority Date: 08/12/1999
  • Status: Expired due to Fees
First Claim
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1. A method of producing a multilayer circuit board which comprises a core substrate and a plurality of layers of wiring lines on both sides of the core substrate, the layers of wiring lines being on each side of the substrate with an insulation layer being interposed therebetween, the layers of wiring lines on both sides being interconnected by conducting members provided on the inside walls of through holes going through the core substrate, and the layers of wiring lines on each side of the core substrate being connected with each other by vias of a conductor material going through the interposed insulation layer, the method comprising, on each of sides of the core substrate, alternately forming a layer of wiring lines and an insulation layer while connecting an lower layer of wiring lines with an upper layer of wiring lines by vias, wherein the conducting member on the inside wall of the through hole and the via are formed in separate steps.

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