Importance

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Abstract

A printed circuit board includes a first outer electrically conductive pattern layer, a first insulation layer, a first inner electrically conductive pattern layer, a connection adhesive sheet, a second inner electrically conductive layer, a second insulation layer, a second outer electrically conductive pattern layer, and a identification mark, which are arranged in that order. The first outer electrically conductive pattern layer includes many first gold fingers. The second outer electrically conductive pattern layer includes many second gold fingers. The blind hole corresponds to the identification mark. The first outer electrically conductive pattern layer, the second outer electrically conductive pattern layer, and the at least one identification mark are simultaneously formed.

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First Claim