Patent ID: 6934019

Claim:
A confocal chromatic wafer-inspection system comprising: a table for supporting a wafer for inspection, the table being movable along an x-axis and along a y-axis in an XY plane; movement means for moving the table in the XY plane; a confocal chromatic height measurement system, perpendicular to the table, for measuring a range to a point on a surface of the wafer so as to enable recognition of changes in surface height of the wafer while the wafer moves with the table; and a computer operable for: (i) storing a bumps map of the wafer; (ii) controlling the movement means to move the table such that a measuring point of the confocal chromatic height measurement system crosses each bump of the wafer; (iii) storing a height profile of each bump; (iv) at least one of: comparing the height profile of each bump to height profiles of other bumps on the wafer, and checking the height profile of each bump according to predetermined criteria; and (v) outputting comparison results.