Patent · US Expired

Thermionic emitter with balancing thermal conduction legs

US6426587B1 · kind B1 · utility

10Cited by

3References

6Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Erich Hell · Erlangen, DE
Manfred Fuchs · Nuremberg, DE
Markus Schild · Herzogenaurach, DE

Key dates

Filing date	Apr 25, 2000
Grant date	Jul 30, 2002
Priority date	—
Expiry date	Apr 25, 2020

Classification

Technology area (CPC H)Electricity
CPC primaryH01J2201/193
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A thermionic emitter has a flat emission surface that is subdivided by slits into generally spiral or serpentine conductor sections, the surface having legs extending therefrom that form part of the current supply terminals and that also serve for securing the emitter. Each of these legs has a portion with a longitudinal electrical resistance that is elevated compared to that of the conductor sections, such that areas of maximum temperature migrate from the middle of the emitter to its edges as the heating current increases.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.