Patent ID: 7697116
Filing Date: 2010-04-13
Classification: G03F

Abstract:
1. A lithographic projection apparatus, comprising: an illumination system configured to condition a beam of radiation from a radiation source; a support structure configured to support a patterning device, the patterning device configured to pattern the beam of radiation according to a desired pattern; a substrate table configured to hold a substrate; a projection system configured to project the patterned beam of radiation onto a target portion of the substrate; and a device positioned in a first plane intermediate a second plane conjugate to a plane of the substrate and a third plane conjugate to a pupil plane of the projection system, the first plane located between the radiation source and the support structure, and the device comprising a blade selectively insertable into the beam of radiation, wherein the blade includes a solid blade and a partially opaque blade, wherein the partially opaque blade comprises a grid of rods, bars or wires.