ELECTRON-BEAM LASER DEVICE WITH ELECTROSTATIC FOCUSING OF ELECTRON BEAM Russian patent published in 2003 - IPC

FIELD: electronic engineering; projection television units. SUBSTANCE: device has envelope accommodating laser screen and electron gun designed for generating electron beam, as well as focusing system used to focus electron beam on laser screen that incorporates first and second electrodes enclosing electron beam and disposed in tandem along electron beam travel so that facing edges of electrodes are separated by a certain gap. Device also has auxiliary electrode placed around first and second electrodes at least in vicinity of mentioned gap and actually electrically isolated from these electrodes. EFFECT: enhanced sharpness of beam focusing due to raising voltage without charge accumulation on envelope. 8 cl, 1 dwg