| 摘要 |
PURPOSE:To prevent potential fluctuation caused by current leakage by irradiating electron beams from a cathode of an electron gun to an electrostatic convergence electrode and the periphery thereof so as to eliminate the source of current leakage in the periphery of the electrostatic convergence electrode. CONSTITUTION:The irradiation of electron beams from a cathode of an electron gun 2 to the periphery of an electrostatic convergence electrode 3 causes electrons to collide with electrostatic convergence electrode plates 3c and 3d, resulting in decreased potential of the electrostatic convergence electrode plates 3c and 3d, and increased potential difference, i.e. convergence potential difference Econv, between the electrostatic convergence electrode plates 3c and 3d and high tension electrode plates 3a and 3b. The increased convergence potential difference Econv provides actual knocking effect, eliminating dusts and hurrs. At the same time, the irradiation of electron beams causes the electrostatic convergence electrode 3 and peripheral electrodes to generate heat and discharge the gas absorbed to the electrodes, and the electron collision, too, causes the gas absorbed to the electrodes to discharge, with the discharge gas absorbed to a getter.
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