| abstract |
The light element excited by electrons is capable of exhibiting satisfactory emission characteristics of emitters, for an extended period. A hydrophobic insulating film (17) is formed on an anode substrate (2) made of glass, so as to cover its exposed part between anode electrodes. This prevents the anode glass substrate (2) from being directly attacked by electrons, thereby preventing the decomposition of water and the like contained in a surface of the glass, giving rise to the prevention of release, by glass, oxygen which causes a deterioration of the emission characteristics of emitter cones (14). |