Patent ID: 7250599

Claim:
Image-generating energy filter for electrically charged particles such as electrons and ions with at least two toroidal energy analyzers arranged in a row, where at least one energy analyzer has a diaphragm at its entrance plane and another diaphragm at its exit plane, characterized in that: a transfer lens device ( 20 , 20 ′) is located between the exit plate ( 5 ) of the first energy analyzer ( 30 , 30 ′, 30 ″) and the entrance plane ( 6 ) of the second energy analyzer ( 40 , 40 ′, 40 ″), which device has negative lateral magnification V L , negative angular magnification V W , image rotation around the angle γ=β−180°, and a telescopic beam path, where its respective deflection angles φ are equal and its energy-dispersive planes ( 33 , 43 ) are rotated around the angle β with respect to each other.