| 摘要 |
FIELD: instrument making. ^ SUBSTANCE: invention relates to corpuscular-optical instrument making. Power filter (PF) comprises the first magnetic deflector (MD1) with optical axis shifted through 90, first matching lens unit (MLU1), power analyser (PA), second matching lens unit (MLU2), second magnetic deflector (MD2) and power diaphragm (PD). PF input arm represents the first input arm of MD1, its first optical axis passing from the first input to first output of MD1. First output arm of MD1 and input arm of PA are located on the axis MLU1. PA output arm and MD2 are located on MLU2 axis. MD2 output arm is aligned with the first input arm of MD1, while PA is located on PF. The nit of guide lens (UGL) is located between MD1 and MD2. MLU1, MLU2 and UGL represent axially symmetric lenses. MD has two inputs, two outputs and three optical axes. Note here that MD second input is located on straight line aligned with its first input arm. Its second input is located on the straight line aligned with its first output arm. MD1 is connected to variable-polarity power source. MD2 output arm is directed toward MD1 while MD1 output arm makes output arm of PF. MLU1 and MLU2 can accommodate retarding and accelerating lenses. PA can be built around semi-spherical condenser. ^ EFFECT: expanded performances due to power dispersion in wide range. ^ 7 cl, 2 dwg |
