POWER FILTER FOR CORPUSCULAR-OPTICAL SYSTEM OF IMAGE CONSTRUCTION AND TRANSMISSION Russian patent published in 2009 - IPC H01J37/05 

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 MD_1, 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