Patent ID: 7271907
Filing Date: 2007-09-18
Classification: G03F

Abstract:
1. A lithographic apparatus configured to receive an object having at least one mark that includes a plurality of structures arranged in rows and columns, the lithographic apparatus including an alignment arrangement comprising a light source, optics and a detector, the light source being arranged for producing a light beam, the optics being arranged for receiving the light beam, and the detector being arranged to produce an alignment signal, the lithographic apparatus comprising: an alignment beam generator that includes the optics and produces an alignment beam having an alignment beam spot with a first alignment beam spot portion extending in a first direction and a second alignment beam spot portion extending in a second direction that is substantially perpendicular to the first direction; a projection system that directs the alignment beam onto the at least one mark on the abject; beam directing optics that receive alignment radiation back from the at least one mark and direct the alignment radiation to the detector; an actuator that is adapted to move the object relative to the alignment beam; a processor that is connected to the actuator and the detector, and arranged to: