Luminescent display tube with plural cathodes and electron flux dispersing means

摘要

In an electronic device such as a fluorescent display tube which comprises an evacuated envelope, a plurality of cathode electrodes and an anode electrode, auxiliary electrodes are arranged between the cathode electrodes and the anode electrode. Each auxiliary electrode is impressed with AC potential superposed on DC potential and acts to disperse the electron flux emitted by the cathode electrodes in the lateral direction thus uniformly distributing the electron flux on the anode electrode.