ELECTRON GUN HAVING A DISTRIBUTED ELECTROSTATIC LENS

摘要

ELECTRON GUN HAVING A DISTRIBUTED ELECTROSTATIC LENS A color cathode ray tube includes an electron gun having a distributed lens system which yields smaller spot sizes on a phosphor screen at intermediate and higher cathode currents when compared with prior art electrostatic lenses having similar diameters. The lens comprises first, intermediate and final accelerating and focusing electrodes, the intermediate one of which forms a substantially cylindrical electron lens element. The intermediate accelerating and focusing electrode serves to establish an essentially exponentially increasing potential distribution along the electron beam path.