Patent ID: 7053979
Filing Date: 2006-05-30
Classification: G03B,G03F

Abstract:
1. A method for controlling scanning synchronization error in a projection imaging system, the method comprising: obtaining one or more scanning synchronization error maps comprising a plurality of error components; obtaining one or more focal plane deviation (FPD) error maps comprising a plurality of error components; separating the one or more synchronization error maps and one or more FPD error maps error components into repeatable and non-repeatable parts; converting the repeatable parts into one or more mathematical models that express the repeatable parts in mode correctable and uncorrectable terms; inputting lens distortion map data, scanning synchronization error map data, FPD error map data, and the one or more mathematical models into a database linked to a process controller that executes process control algorithms; and correcting scanner motion of the projection imaging system based on output from the process controller.