| 摘要 |
<p>PURPOSE:To enable such counterboring as to expose the wiring layer of a multilayer wiring board completely without cutting it too much. CONSTITUTION:A processor comprises a processing tool 304, a rotating motor 303, a control motor 302, a power supply circuit 306 for giving voltage to the tool, a contact detecting circuit 308 for detecting that the tool has contacted with the objective lower-layer wiring, a detection lead wire 309, and a control circuit 310 for outputting a control signal to a variety of motors. When the tool shaves the insulating part of a board and reaches the specified lower layer and continuity is made, the control circuit 310 generates a control signal by the signal from a contact detection circuit 308, and stops the sending of the processing tool 304 or rotates it reversely.</p> |
