Patent ID: 11874103
Assignee: ASML NETHERLANDS B.V.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 7:
8. An alignment measurement apparatus to measure positions of alignment marks on a substrate prior to it being sent to a separate lithographic apparatus for exposure, based on measurements made by the alignment measuring apparatus, of the substrate, the alignment measurement apparatus comprising:
a first station comprising a first alignment sensor system to measure positions of a first number of alignment marks on a substrate;
a second station comprising a second alignment sensor system to measure positions of a second number of alignment marks on the substrate or another substrate, wherein a central portion of the second station is spaced by at least the cross-sectional dimension of the substrate from a central portion of the first station; and
a movable substrate table constructed to hold the substrate, wherein the substrate table is arranged to move to the first station and the second station.