CATHODE-RAY TUBE WITH IMPROVED ELECTRON GUN

摘要

An improved cathode-ray tube includes a viewing screen and an electron gun for generating and directing three electron beams toward the screen. The tube includes a horizontal axis, a vertical axis and a longitudinal axis. A horizontal plane of said tube includes the horizontal and longitudinal axes. The gun includes a plurality of electrodes spaced in order from three cathodes, with the furthest electrode from the cathodes being interconnected to a tube anode. The plurality of electrodes form a beam forming region, a first quadrupole lens, a main focus lens and a second quadrupole lens in the path of each electron beam. The improvement comprises the placement of the second quadrupole lens on the anode side of the main focus lens, with the first quadrupole lens being diverging for defocusing the beams in the horizontal plane, and the second quadrupole lens being converging for focusing the beams in the horizontal plane.