Electron gun for cathode ray tube

Abstract

Abstract PURPOSE:To improve the performance of an electron gun by assigning each electrode length of electron beam focusing main lenses and distances between electrodes to specific values in order to reduce the electron optical scale factor and control the spherical aberration component. CONSTITUTION:An electron gun is formed with electron beam sources 1-3 and focusing main lenses 4-7. The size of each electrode is assigned so that relations G5l/AL>=0.55, Lu/AL>=0.15, and G4l/Lu>=0.50 are satisfited, where the electrode total length from G34-G56 is AL, and the total length of a distance between G34 and G45 (g1), length of G45 (G41), and distance between G45 and G56 (g2) is Lu concerning the first to fourth focusing electrodes G34, G45, G56, and G67 which constitute the main lens part. Thus the axial voltage distribution of focusing electrodes changes from a moderate voltage to lower voltage slightly and monotonically, and the performance of a lens system which changes to higher voltage monotonically can be drawn out extremely effectively.

Inventors

• 👤 Eiji Kanbara

Bibliographic Details