Patent ID: 7253364
Filing Date: 2007-08-07
Classification: C25D,H05K

Abstract:
1. A circuit board having an electrically conductive structure formed between circuit layers thereof, comprising: an insulating layer; a first patterned circuit layer formed on the insulating layer, the first patterned circuit layer having a plurality of conductive pads and traces; at least one dielectric material layer formed on the insulating layer, wherein second openings are penetratingly formed in the dielectric material layer to expose the conductive pads respectively; at least one conductive post formed in the second openings of dielectric material layer and electrically connected to the conductive pads of first patterned circuit layer, the conductive post and the conductive pads having the same diameter, and the conductive pads being formed in the dielectric material layer; a second conductive layer formed on the conductive post and part of the dielectric material layer; and a second patterned circuit layer formed on the second conductive layer and having an extension portion, wherein the extension portion fills the second openings and electrically connects with the conductive post.