Patent ID: 6949751
Filing Date: 2005-09-27
Classification: B82Y,H01J

Abstract:
1. A slit lens arrangement for particle beams, such as for a projection of a mask onto a workpiece, said slit lens arrangement comprising: at least two combined lenses positioned one behind another, each combined lens or said at least two combined lenses having a cylinder lens and a quadrupole lens with an optical axis of each of said cylinder lens and said quadrupole lens running parallel to one another, said optical axis of said quadrupole lens being displaceable in a parallel manner, said cylinder lens and said quadrupole lens each having a gap-shaped aperture between pole shoes or in electrodes with the same spatial orientation to one another with said cylinder lens and said quadrupole lens being aligned relative to one another, so that focusing said quadrupole lens of each said combined lens takes place in a section in which said cylinder lens is not focused and defocusing of said quadrupole lenses takes place in a section wherein said cylinder lens focuses; optical axes of said at least two combined lenses being displaceable relative to one another, with penetration points of said optical axes of said at least two combined lenses through an object plane and an image plane determining centers of said object plane and said image plane which are to be imaged one on the other, a double deflection of said optical axis taking place via an induced dipole field of a displaced said quadrupole lenses; a beam path through said slit lens arrangement being approximately telescopic; and, a diffraction plane, or aperture plane, of said slit lens arrangement lying between said at least two combined lenses and determining a point on a center axis, with respect to which said at least two combined lenses are arranged, so that said at least two combined lenses lie antisymmetrically to one another and at the same time meet a condition that a distance of the first and second combined lenses from said diffraction plane, or aperture plane, and a construction or fields of functionally identical elements of said at least two combined lenses from one another are in each case in a ratio that corresponding to an imaging scale, with said displacements of said optical axis of each said quadrupole lens of said at least two combined lenses taking place in diametrically opposite directions with a magnitude of the displacements from one another being in a ratio corresponding to said imaging scale.