Patent ID: 6606154
Filing Date: 2003-08-12
Classification: G01N

Abstract:
A wafer inspecting apparatus for performing a visual inspection of a wafer in light reflected therefrom, the apparatus comprising:a wafer holder including a ring-shaped first holder for holding a wafer to be inspected at its periphery with at least three chuck units that contact an edge and a back surface of the wafer and a second holder rotatably holding the first holder; a first rotatable shaft fixed to the wafer holder and rotatable on a first axis, the first axis passing through an approximate center of the wafer being held by the wafer holder and being approximately parallel to a plane of the held wafer; a shaft holder for rotatably holding the first shaft and movable between a wafer delivery position and a wafer inspection position; and a second rotatable shaft fixed to the shaft holder and rotatable on a second axis, the second axis passing through the approximate center of the wafer being held by the wafer holder and being approximately parallel to the plane of the held wafer.