Elektronenerzeugungssystem mit Mehrschrittfokussierung für Kathodenstrahlröhre.

摘要

A multi-step focusing type electron gun is disclosed which includes a cathode, electrodes G1 and G2, and electrodes G3, G4, G5, G6, G7, and G8 for forming two unipotential auxiliary lenses and a bipotential major lens in the main lens means, characterized in that the electrodes G4, G5, G6, G7 are so constituted as to satisfy some specific formulas. The electron gun according to the present invention can reduce the size of the beam spot, and the size of the halo formed around the beam spot. Further the electron gun according to the present invention improves the spherical aberration, and provides the flexibility in designing for different purposes, as well as improving the image quality on the screen.