| 摘要 |
<p>A drilling method and drilling device of a printed circuit board, the method comprising: drilling a hole from the initial position by a drill bit, generating a first electrical signal by a drilling machine when the drill bit contacts with a first conductive layer (101) of the printed circuit board, and determining a first conductive position on the basis of the first electrical signal, thus obtaining a first Z-coordinate information corresponding to the first conductive position; continuing to drill the hole after drilling through the first conductive layer (101), generating a second electrical signal by the drilling machine when the drill bit contacts with a second conductive layer (104), and determining a second conductive position on the basis of the second electrical signal, thus obtaining a second Z-coordinate information corresponding to the second conductive position; continuing to drill the hole, and drilling through the printed circuit board, thus obtaining a through hole; and back drilling in the position of the through hole according to a preset depth, wherein, the preset depth is the sum of the dielectric thickness between the second conductive layer (104) and the first conductive layer (101) and the compensation depth. The drilling method achieves a precise back drilling depth by obtaining the difference value between the back drilling face and` the layers to be drilled through in the through hole drilling process, thereby reducing the Stub length of the back drilling.</p> |
