Patent ID: 11212922

Abstract:
The disclosure provides a method for manufacturing a circuit board, which includes: (1) providing a substrate, forming a through hole in the substrate; (2) filling the through hole with a conductor to form a conductive hole; (3) providing a peelable film to cover the substrate; (4) forming a groove by laser, the groove including a concave portion; (5) performing a surface treatment on a wall of the groove; (6) removing the peelable film; (7) forming a seed layer; (8) making a circuit layer to obtain a circuit board unit, the circuit layer including a connection pad, the connection pad shaped as a conductive protrusion which surrounds and is electrically connected to the conductor; (9) repeating step (1) to step (8) at least once; and (10) laminating the circuit board units. The disclosure also provides a circuit board.