Patent ID: 8222528

Claim:
A circuit board structure for electrical testing, comprising: a core board having a plurality of first circuits, distributing wires and electroplating conductive wires formed thereon, wherein two ends of the distributing wires respectively connect the first circuits and the electroplating conductive wires; a dielectric layer formed on surfaces of the core board, the first circuits, the distributing wires and the electroplating conductive wires, wherein at least an opening is formed in the dielectric layer to expose the distributing wires; a plurality of second circuits formed on a surface of the dielectric layer and electrically connected to the first circuits; a solder mask layer formed on surfaces of the dielectric layer and the second circuits; and at least a first opening formed in the solder mask layer, on top of the distributing wires, and deep into the dielectric layer and the distributing wires, so as to create a broken circuit between the first circuits and the electroplating conductive wires, wherein the first opening is disposed above the opening formed in the dielectric layer, and the first opening has an aperture larger than that of the opening, the opening being formed in stepwise, thereby enabling electrical testing of the circuit board structure.