Patent ID: 8471581

Claim:
An apparatus for inspecting defects in a circuit pattern of a substrate, comprising: a pin probe configured to input a voltage while coming into contact with an inspection target circuit pattern formed on one side of said substrate; a capacitor sensor provided with a membrane electrode which is opposite a connection circuit pattern to be electrically connected to the inspection target circuit pattern formed on the other side of the substrate through a via in a non-contact manner, and configured to detect both capacitance and capacitance variation, generated due to displacement of the membrane electrode attributable to electrostatic attractive force acting from the connection circuit pattern on the membrane electrode; and a capacitance measurement unit connected to the membrane electrode of the capacitor sensor and the connection circuit pattern, and configured to measure capacitance attributable to the displacement of the membrane electrode, which is input from the capacitor sensor, wherein the capacitance measurement unit is to measure capacitance incurred by displacement of the membrane electrode when the membrane electrode is curved towards the connection circuit pattern due to Coulomb force in the case of connecting the inspection target circuit pattern and the connection circuit pattern normally.