| CPC H01J 37/12 (2013.01) [A61N 5/1077 (2013.01); A61N 2005/109 (2013.01); H01J 27/024 (2013.01); H01J 49/068 (2013.01); H01J 2237/038 (2013.01)] | 20 Claims |

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1. An electrostatic lens, comprising:
a mount plate;
a biasable electrode; and
an insulative structure positioned relative to the biasable electrode and the mount plate, wherein the insulative structure comprises a plurality of adjacent insulative segments between a proximal end and a distal end of the insulative structure, and wherein each adjacent insulative segment comprises a horizontal exterior surface between two rounded edges.
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