Patent ID: 9500599
Filing Date: 2016-11-22
CPC Classification: G01J,G01N,H04N

Claim Text:
1. An apparatus for inspecting surfaces of semiconductor chips, comprising: a laser generator generating a periodic continuous wave (CW) laser; a laser controller transforming the periodic CW laser into an inspection laser beam of which a beam size is smaller than a surface size of the semiconductor chip and irradiating the inspection laser beam onto a plurality of the semiconductor chips such that the semiconductor chips are partially and simultaneously heated by the inspection laser beam; a thermal image generator detecting thermal waves radiated from the semiconductor chips in response to the inspection laser beam and generating thermal images corresponding to the thermal waves; and a lock-in processor processing the thermal image using a lock-in thermography technique, thereby generating a lock-in thermography image of the thermal image in which a surface defect is included, wherein the lock-in processor includes a lock-in amplitude processor processing amplitudes of the thermal waves to remove dummy images corresponding to dummy waves caused by thermal disturbances from the thermal images, thereby generating lock-in amplitude images corresponding to the thermal images for each scanning point as the lock-in thermography images.