Patent ID: 7968844
Filing Date: 2011-06-28
Classification: G01R,H01J,H01L

Abstract:
1. A hole inspection apparatus, comprising: electron beam irradiation means for irradiating respective electron beams to inspect a plurality of inspection target holes; current measuring means for measuring current, which is generated by irradiating the electron beams radiated from the electron beam irradiation means, through a conductive layer located under the holes, or through the conductive layer and a separate detector; and data processing means for processing data acquired through the measurement of the current measuring means; wherein a plurality of electron columns, which are used as the electron beam irradiation means, are disposed in an n×m arrangement in such a way that each electron column corresponds to a plurality of holes, and is sequentially operated, the current measuring means measures current values for the respective holes in response to the sequential operation of the electron columns, and the data processing means sequentially processes the data measured by the current measuring means, whereby information about whether the holes are open at both ends thereof is acquired, wherein the data processing means inspects the depths, directions and structures of the respective holes by converting data, acquired through the conductive layer and the detector, into images.