Patent ID: 11960216
Assignee: ASML HOLDING N.V.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 8:
9. A lithographic apparatus, comprising:
an illumination system configured to condition a radiation beam;
a support structure configured to support a patterning device;
a substrate table configured to hold a substrate;
a projection system configured to project a pattern imparted to the radiation beam by the patterning device onto a target portion of the substrate; and
first and second positioners configured to position the patterning device and the substrate, respectively, wherein the first positioner comprises:
a pre-alignment system with at least two channels, comprising:
a common object lens group configured to collect diffracted beams from the patterning device, wherein the common object lens group is further configured to produce telecentricity in an object space of the pre-alignment system;
a multipath sensory array comprising at least one image lens system, wherein the at least one image lens system comprises:
a telecentric converter lens configured to produce telecentricity in an image space of the pre-alignment system; and

a detector for each of the at least one image lens system, wherein the detector is configured to create a pre-alignment signal based on the diffracted beams.