Patent ID: 7935926

Claim:
Inspection equipment, comprising: a plurality of microcolumns; one or more first inspection units to inspect an object at high speed, the first inspection unit comprising a shaft, to which one or more chambers receiving one or more microcolumns are coupled, the shaft being disposed in a direction substantially perpendicular to a direction in which the object is moved, and one or more electron detecting units for detecting electrons occurred by radiating electron beams emitted from the microcolumns onto the object to determine whether errors exist in the object; and at least a second inspection unit provided behind the first inspection unit to precisely inspect a portion of the object in which errors exist, the second inspection unit comprising a movable shaft movable in X and Y directions, and a chamber receiving a microcolumn coupled to the movable shaft, wherein each microcolumn is independently movable along separate x and y shafts using separate drive units; and wherein the inspection equipment is constructed in a vacuum chamber with a vacuum state of 10-7 torr or less, and the chambers of the first inspection units and the second inspection unit for receiving microcolumns are operated in a vacuum state of 10 −8 ˜10 −11 torr.