Electron gun having a distributed electrostatic lens

Details Electron gun having a distributed electrostatic lens Electron gun having a distributed electrostatic lens

H - Electricity

01

J

313/35.13, 313/3

H01J 29/62 (2006.01) H01J 29/50 (2006.01)

Patent

CA 1111487

ELECTRON GUN HAVING A DISTRIBUTED ELECTROSTATIC LENS Abstract 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 electro- static 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 inter- mediate accelerating and focusing electrode serves to establish an essentially exponentially increasing potential distribution along the electron beam path. -1-

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