Patent ID: 8381394

Claim:
A method of forming a circuit board having an embedded electronic component, comprising: preparing a substrate having a first surface, a first wiring pattern and a plurality of first conductors formed on the first surface, a second surface opposite the first surface, a second wiring pattern formed on the second surface, and a second conductor disposed in a first hole extending through the substrate from the first surface to the second surface, the second conductor being connected to at least the first conductors at the first surface of the substrate; preparing a first electronic component having a third surface, a plurality of third conductors formed on the third surface, a fourth surface opposite the third surface, and a fourth conductor disposed in a second hole extending through the first electronic component from the third surface to the fourth surface; mounting the first electronic component on the first surface of the substrate so that the plurality of first conductors make electrical contact with the plurality of third conductors; laminating a first prepreg onto the first surface of the substrate, the first prepreg having an opening for accommodating the first electronic component; laminating a second prepreg onto the second surface of the substrate, the second prepreg having a fifth surface, a fifth conductor formed on the fifth surface, and a sixth surface opposite the fifth surface, the sixth surface of the second prepreg meeting the second surface of the substrate; laminating a third prepreg onto the first prepreg, the third prepreg having a seventh surface, a sixth conductor formed on the seventh surface, and an eighth surface opposite the seventh surface, the eighth surface of the third prepreg meeting the first prepreg; forming a third hole in the third prepreg, extending from the seventh surface to the eighth surface; forming a seventh conductor in the third hole; and patterning the sixth conductor.