Method of Manufacturing Integral Shadow Gridded Controlled Porosity, Dispenser Cathodes.
Patent, Filed 10 Dec 86, patented 17 May 88,
DEPARTMENT OF THE NAVY WASHINGTON DC
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This invention relates to cathodes for travelling wave tubes, and more particularly to a controlled porosity dispenser cathode and a method of manufacture therefore. The controlled porosity dispenser CPD cathode apparatus includes a support structure of emissive material, a shadow grid of emission limitation mesas integrated with the support structure. The interstices of emissive material between the mesas have arrays of small closely spaced holes. The invention discloses a method of manufacturing a CPD cathode by manufacturing a mandrel with an array of triangular slots coating the mandrel with a material to form support structure machining the top surface of the overcoated mandrel to leave a support structure embedded in the slots of the mandrel depositing an emissive material over the mandrel, with its embedded support structure depositing a refractory emission suppressing material above the emissive layer machining the deposited layers to leave a shadow grid pattern of emission supporting surfacesand a linking support structure etching out the mandrel leaning a support structure with the shadow grid integrated with the mesas of emissive material deposited thereon, and thin intersticial areas of emissive material drilling an array of small holes in the areas of emissive material and narrowing the diameter of the holes. Patents, PAT-CL-313-346-DC, Ion milling, Electron discharge machining. aw
- Electrical and Electronic Equipment