Patent ID: 8415967

Claim:
A wafer inspection apparatus, comprising: a loading unit configured to allow a cassette, in which multiple wafers are loaded, to be lifted up or lowered by an elevator, the loading unit having push means installed on a portion thereof to allow the wafers to be horizontally withdrawn one by one; a surface inspection unit provided with a plurality of stages on a top surface thereof so that the wafers withdrawn from the loading unit can be loaded onto the stages, the surface inspection unit performing surface inspection of each of the wafers using a first vision module installed above the stages; a wafer transfer unit, a center portion of which is rotatably installed and both ends of which are provided with adsorption parts so as to adsorptively fix a top surface of each wafer having completed the surface inspection and transfer the wafer to a subsequent process; an internal inspection unit in which a conveyor that is rotated in one direction by power supplied from a motor is installed to allow the wafer transferred by the wafer transfer unit to be transferred, the internal inspection unit performing internal inspection of the transferred wafer through a second vision module installed above and below the conveyor; an unloading unit located closer to an end portion of the conveyor in a transfer direction thereof, and provided with a cassette lifted up or lowered by an elevator, thus enabling wafers having completed the internal inspection to be sequentially loaded onto the unloading unit; and a control unit configured to control a series of wafer inspection procedures in compliance with sequential control programming.