Patent ID: 7573574
Filing Date: 2009-08-11
Classification: G03F

Abstract:
1. A lithographic apparatus, comprising: an illumination system configured to provide a radiation beam; a product patterning device configured to pattern the radiation beam with a product pattern representing features of a product device; a metrology target patterning device configured to pattern the radiation beam with a metrology target pattern representing at least one metrology target; a metrology target pattern controller configured to adjust the metrology target pattern independently of said product pattern; a support structure configured to support the product patterning device and the metrology target patterning device, such that they are separated from each other; and a projection system configured to project the radiation patterned by said product patterning device and said metrology target patterning device onto a target portion of a substrate; wherein said metrology target pattern controller adjusts the metrology target pattern after said product pattern has been finalized and prior to the projecting of the radiation patterned by the product patterning device onto the substrate.