Patent ID: 7759029
Filing Date: 2010-07-20
Classification: G03F,H01L,Y10S

Abstract:
1. A device manufacturing method, comprising: providing a substrate comprising an alignment mark that is disposed in a transmissive layer, the alignment mark comprising a relatively high reflectance area and a low reflectance area that is at least partially covered by a layer of radiation sensitive material; aligning the alignment mark to a reference, with an alignment beam of radiation; providing a projection beam of radiation using a radiation system; using a patterning structure to endow the projection beam with a patterned cross-section; and projecting the patterned beam of radiation onto a target portion of the layer of radiation sensitive material, wherein the relatively high reflectance area comprises a plurality of substantially linear sub-gratings, at least one of the substantially linear sub-gratings comprising a plurality of spaced square regions.