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US 6,646,366 B2Granted
Directly heated thermionic flat emitter
AssigneeSiemens Aktiengesellschaft
InventorsErich Hell, Detlef Mattern
Life of this patent
Estimating the term…
Abstract
A directly heated thermionic flat emitter has an emission surface divided by slots into interconnects that have respective terminal lugs forming power leads arranged at a peripheral edge. A number of segments are connected by respective narrow webs to the outermost interconnects of the emitter but have no connection to one another. The webs are arranged and dimensioned such that practically no current can flow from the interconnects to the segments and so that thermal conduction to the segments is largely suppressed.
Claims5
A directly heated thermionic flat emitter comprising:
- a flat emission surface having a peripheral edge, said flat emission surface having a plurality of slots therein dividing said emission surface into a plurality of interconnects including outermost interconnects located at said peripheral edge, each of said interconnects having a terminal lug for power supply disposed at said peripheral edge;
- and
- a plurality of segments surrounding said peripheral edge of said emission surface and being respectively connected to said outermost interconnects by a plurality of narrow webs, said segments having no connection to each other and said webs being located and dimensioned so that substantially no current flows from said outer interconnects to the respective segments and so that thermal conduction to said segments is substantially suppressed, said segments forming a peripheral non-emitting region surrounding said emission surface.
Dependencies are inferred from the claim text.