In order to clarify the thermal emission characteristics in diode type electron-guns characterized by simple electrode configuration composed at a flat cathode and a flat anode applied a positive potential against the cathode, abnormal emission from the cathode edge, namely cathode edge emission was examined both theoretically through Zhaos' approximate analysis and experimentally by measuring test guns. The results obtained are as follows, (1) the theoretical estimation well agrees with the measurements, (2) the effect of edge emission should be taken into account in practically used diode guns e.g. for camera tubes, especially when they are operated on a lower anode potential.
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