Patent ID: 7126061

Claim:
A printed circuit board for avoiding producing cutting burrs, comprising: an infrared data association chip; a packaging substrate packaging the infrared data association chip thereon; and a plurality of bonding pad units alignedly arranged on the packaging substrate and aligned with one side of the infrared data association chip, each of the bonding pad units comprising: a plated through hole formed in the packaging substrate, the plated through hole is plated with a conductive material on an inner wall defining the plated through hole; a conductive pad including: a first conductive portion arranged on a top surface of the packaging substrate to surround substantially an upper semicircular circumference of the plated through hole, and a second conductive portion arranged on the top surface of the packaging substrate to surround substantially a lower portion of a lower semicircular circumference of the plated through hole; a non-conductive portion arranged on the packaging substrate, the non-conductive portion being recessed from the top surface of the packaging substrate, the non-conductive portion being along substantially an upper portion of the lower semicircular circumference of the plated through hole, the non-conductive portion traversing two sides of the plated through hole, the non-conductive portion and the second conductive portion surrounding substantially the lower semicircular circumference of the plated through hole; and a cutting region defined within the non-conductive portion for cutting such that the conductive pad surrounding substantially the upper semicircular circumference of the plated through hole is free of burrs.