Patent ID: 9204561
Filing Date: 2015-12-01
Classification: H05K,Y10T

Abstract:
1. A method for manufacturing an electrical circuit board, comprising the following steps: (a) manufacturing a carrier board, the carrier board being a flexible circuit board, the carrier board comprising a first substrate, which has a substrate upper surface and a substrate lower surface, the substrate upper surface comprising at least one upper circuit trace; (b) forming an upper adhesive layer on the upper circuit trace; (c) forming an upper adhesive layer opening zone in a portion of the upper adhesive layer that exposes a portion of the upper circuit trace thus forming an upper circuit trace exposed zone; (d) filling an etching resisting layer in the upper adhesive layer opening zone; (e) forming an upper conductor layer on the upper adhesive layer and the etching resisting layer, the upper conductor layer showing a first height difference with respect to the upper circuit trace exposed zone of the upper circuit trace in a vertical direction; (f) forming a lower conductor layer on the substrate lower surface of the carrier board, the lower conductor layer having a lower conductor layer bottom surface; (g) forming at least one through hole, which extends in the vertical direction through the upper conductor layer, the upper adhesive layer, the upper circuit trace, the first substrate and the lower conductor layer and forms a hole wall surface, the through hole having a circumferential zone defining a through hole local zone; (h) forming a conductive cover section to cover the hole wall surface of the through hole, the upper conductor layer, and the lower conductor layer bottom surface of the lower conductor layer so as to have the upper conductor layer, the upper circuit trace, and the lower conductor layer to electrically connect with each other through the conductive cover section; and (i) removing a portion of the conductive cover section that is outside the through hole local zone and a portion of the upper conductor layer that is outside the through hole local zone.