Patent ID: 9568394
Date: 2017-02-14
CPC Classifications: G01M,G03F,Y10T

Claim:
1. Optical device comprising: a. an imaging optical unit for imaging an object field in an image field, b. a structured mask, which is arranged in the region of an object plane of the imaging optical unit via a reticle holder configured to be displaced in a reticle scanning direction, and c. a sensor apparatus, which is arranged in the region of an image plane of the imaging optical unit via a substrate holder configured to be displaced in a substrate scanning direction, d. wherein the mask has at least one measurement structure to be imaged on the sensor apparatus, e. wherein the sensor apparatus comprises at least two line sensors, each with a multiplicity of sensor elements, f. wherein the line sensors are embodied as separate, spatially separated components, and g. wherein the sensor apparatus is configured for testing the imaging optical unit during a displacement of the substrate holder for exposing a substrate arranged on the substrate holder.