Patent ID: 8685202

Claim:
An etching device for removing stubs of plated through holes of a substrate, the device comprising: a lower plate defining a plurality of first through holes, the first through holes running through two opposite surfaces of the lower plate; an upper plate configured for supporting the substrate, the upper plate being above the lower plate and defining a plurality of second through holes aligned with the respective first through holes, the first through holes running through two opposite surfaces of the lower plate, a diameter of the second through hole being larger than that of the first through hole; a connecting mechanism connecting the upper plate and the lower plate together; and a spraying mechanism comprising a pump and a plurality of spray tubes, the pump being configured for supplying an etchant to the spray tubes, a diameter of the spray tube being less than that of the second through hole, the spray tubes each extending through a corresponding first through hole and a corresponding second through hole, each of the spray tubes including a protruding portion protruding beyond the upper plate and configured for extending into the stub, the protruding portion defining at least one spraying opening, the at least one spraying opening being configured for spraying the etchant to the stub of the substrate.