| 摘要 |
PURPOSE:To remove the aberration of an electron lens with a large diameter aperture and obtain a high resolution picture on a phosphor screen by providing an internal electrode with a full circular hole type aperture that is smaller than the aperture diameter and is opposed mutually on the same axis, at the inner part of the electrode and protruding the central aperture section in the large diameter aperture direction. CONSTITUTION:Principal electron lens electrode frame bodies 1 and 1' with the large diameter in-line type integrated structure are arranged opposedly on the same axes 10R, 10G, and 10B so that the ratio for the aperture eccentric distance S of the electrode diameter D can be set to 1<D/S>=0.88 and internal electrodes 2 and 2' are arranged in the respective electrode frame bodies 1 and 1' in a nest shape. These internal electrodes are a closed cylindrical body in which centeral and both outside electron beam transmission apertures 21G to 21B are perforated on a closed surface 22 and a cylindrical side 23 is formed in succession with the closed surface 22 so as to be on the axes 10R to 10B of three central and both outside electron guns that are spaced mutually by the aperture eccentric distance S and the cylindrical section 23 is fit in the cylindrical side 13 of the electrode frame body 1. |
