Patent ID: 8422014

Claim:
A method of inspecting a defect in an inspection target, the method comprising: (1) a step of supplying a particle-containing gas to one end face of the inspection target under pressure, using a laser to apply a first laser beam so that the first laser beam travels near the other end face of the inspection target in a first direction parallel to the other end face of the inspection target, and photographing the other end face of the inspection target perpendicularly to the other end face of the inspection target; (2) a step of supplying a particle-containing gas to the one end face of the same inspection target under pressure, using a laser to apply a second laser beam so that the second laser beam travels near the other end face of the same inspection target in a second direction parallel to the other end face of the same inspection target, and photographing the other end face of the sets inspection target perpendicularly to the other end face of the same inspection target; and (3) a step of specifying a defect in the same inspection target from the photographic results obtained by the steps (1) and (2).