Color tube having ground plane between focus electrodes and screen grids

Abstract

Abstract A COLOR PICTURE TUBE HAVING A GLASS ENVELOPE NECK PORTION CONTAINING A TRIPLE-BEAM ELECTRON GUN ASSEMBLY, COMPRISING A GROUP OF LOW-VOLTAGE ELECTRODES AND AN ADJACENT GROUP OF HIGH-VOLTAGE ELECTRODES FOR EACH BEAM, IS PROVIDED WITH A LOW-VOLTAGE SUPPRESSOR RING SURROUNDING AND SPACED OUTWARDLY FROM AND DISPOSED SUBSTANTIALLY IN THE PLANE OF THE BEAM ACCELERATING GAPS BETWEEN THE NEXT ADJACENT LOW- AND HIGH-VOLTAGE ELECTRODES, FOR ESTABLISHING A TRANSVERSE GROUND PLANE A THOSE GAPS AND THEREBY SHIELDING THE EXTEND SURFACES OF THE LOW-VOLTAGE ELECTRODES FROM THE HIGH ELECTRIC FIELDS OF THE FIRST HIGH-VOLTAGE ELECTRODES. IN THE EXAMPLE GIVEN, THE LOW-VOLTAGE ELECTRODES FOR EACH BEAM INCLUDE A CATHODE, CONTROL GRID AND SCREEN GRID, AND THE HIGH-VOLTAGE ELECTRODES FOR EACH BEAM INCLUDE TWO CONNECTED SPACED ELECTRODES WHICH COOPERATE WITH AN INTERMEDIATE LOW-VOLTAGE ELECTRODE TO FORM AN "EINZEL" FOCUS LENS, AND THE SUPPRESSOR RING IS A WIRE THAT SURROUNDS THE ACCELERATING GAPS BETWEEN THE SCREEN GRIDS AND THE FIRST HIGH-VOLTAGE FOCUS ELECTRODES. A SIMILAR SUPPRESSOR RING IS SUGGESTED FOR USE IN A COLOR PICTURE TUBE HAVING A BIPOTENTIAL LENS, OR IN A SINGLE-BEAM CATHODE RAY TUBE SUCH AS THOSE USED IN BLACK-AND-WHITE TELEVISION RECEIVERS. D R A W I N G

Inventors

• 👤 Charles E Lilley

Bibliographic Details