DISPENSER CATHODE AND METHOD OF ITS MANUFACTURING Russian patent published in 2012 - IPC H01J1/00 

FIELD: electricity.

SUBSTANCE: body and tungsten sponge are formed, the latter is impregnated with an active substance, fixed in the body, mechanical treatment of cathode emitting surface is carried out, and impulse laser radiation is sent to the emitting surface. As a result of laser impact rolled pores open to form microholes evenly arranged along the emitting surface. The wave length λ, (mcm) of impulse laser radiation and depth of microholes h (mcm) comply with the ratio: λ/h=0.009÷0.13 for the ultraviolet area of radiation, λ/h=0.019÷0.26 for a visible range radiation, λ/h=0.039÷0.84 for infrared radiation. Then a layer of metal is applied onto the emitting surface from a platinum group, and thermal treatment of the emitting surface is carried out. The method provides for manufacturing of dispenser cathodes as identical in size of microholes at the same distance of microholes from each other.

EFFECT: higher evenness of microholes distribution along an emitting surface, identity of their geometric dimensions, increased emission capacity of a cathode, simplification and reduction of time to manufacture a cathode.

2 cl, 2 dwg