Patent ID: 7817248
Filing Date: 2010-10-19
Classification: G03F

Abstract:
1. An optical imaging arrangement, comprising: a mask unit adapted to receive a pattern, a substrate unit adapted to receive a substrate; an optical projection unit comprising optical element units, the optical projection unit being adapted to transfer an image of the pattern onto the substrate; a first imaging arrangement component, the first imaging arrangement component being a component of the optical element units, a second imaging arrangement component, the second imaging arrangement component being different from the first imaging arrangement component, the second imaging component being selected from the group consisting of a component of the mask unit, a component of the optical projection unit and a component of the substrate unit; a metrology arrangement; the metrology arrangement comprising at least one reference element; the at least one reference element being mechanically connected directly to the first imaging arrangement component; the metrology arrangement adapted to capture a spatial relationship between the first imaging arrangement component and the second imaging arrangement component in two translational degrees of freedom via the at least one reference element.