Patent ID: 7295291

Claim:
A process for producing a static lens field curvature report in a photolithography projection imaging system, the process comprising: exposing a substrate at an exposure field to an array of focusing fiducials of a reticle of a resist exposure tool in a photolithography projection imaging system, wherein a corresponding first array of focusing fiducials is imaged onto the substrate; shifting the substrate in a first shifting operation; exposing the substrate at the exposure field to the array of focusing fiducials on the reticle in a second exposure operation, wherein a corresponding second array of focusing fiducials is imaged onto the substrate; shifting the substrate a second shifting operation; exposing the substrate at the exposure field to the array of focusing fiducials on the reticle in a third shifting operation, wherein a corresponding third array of focusing fiducials is imaged onto the substrate; determining static lens field curvature using one or more focal plane deviation values determined from measurements of the focusing fiducials; and producing a report from the static lens field curvature.