Patent ID: 6611325
Filing Date: 2003-08-26
Classification: G01N

Abstract:
A scanning system for use with wafers, comprising:a scanner that emits light towards the wafer; a scattered light collector that receives scattered light scattered from the wafer; and an aligning device that aligns the wafer at a specified orientation prior to the wafer receiving the light emitted from the scanner so as to affect an amount of scattered light receivable by the scattered light collector, wherein the wafer defines a trailing end, a notch and an upper surface that intersects the light emitted from the scanner, the wafer being rotated at least one of 34, 35, 36, 44, 45 and 46 degrees relative to a plane perpendicular to the upper surface of the wafer, such that the notch is spaced from the trailing end of the wafer when the wafer is transported through the scanner by a wafer transporter.