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Circuit substrate and apparatus including the circuit substrate

  • US 7,358,445 B1
  • Filed: 09/14/2000
  • Issued: 04/15/2008
  • Est. Priority Date: 03/14/1997
  • Status: Expired due to Fees
First Claim
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1. A circuit substrate comprising:

  • a substrate including a first surface and a second surface opposite to the first surface;

    a first conductor pattern formed on the first surface;

    a second conductor pattern formed on the second surface;

    an external terminal formed on the second conductor pattern to mount the circuit substrate on a second substrate;

    a dielectric layer formed on the second conductor pattern and the second surface; and

    a third conductor pattern formed on the dielectric layer and the second surface, whereinthe second surface has larger surface roughness than the first surface,the dielectric layer covers the edge of the second conductor pattern,the third conductor pattern covers the edge of the second conductor pattern through the dielectric layer, andthe second conductor pattern, the dielectric layer and the third conductor pattern form a capacitor.

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