Patent ID: 8638418
Filing Date: 2014-01-28
Classification: G03F

Abstract:
1. A lithographic projection apparatus, comprising: a support structure configured to support a patterning device, the patterning device configured to pattern a beam of radiation according to a desired pattern; a movable table; a projection system configured to project the patterned beam onto a target portion of a radiation-sensitive substrate, the projection system comprising an optical element having a surface facing toward the table; a liquid confinement structure extending along at least a part of the boundary of a space between the optical element and the table, the liquid confinement structure having an inlet to supply liquid to the space to contact the surface of the optical element, the inlet extending diagonally toward the table and having an opening between the surface of the optical element and the table; and a passage formed between the optical element and the liquid confinement structure to allow movement of liquid above the surface of the optical element.