| 摘要 |
PURPOSE:To obtain image points of a plurality of electron beams all imaged on a fluorescent screen, by allowing a position, in which a crossover point is formed by an electron beam on a tube axis, to differ from a position, in which a crossover point is formed by an electron beam detached from the tube axis. CONSTITUTION:Though hole diameter of the second grid 4 are formed in same size for all beams, hole diameter for the center beam in the first grid 2a is formed larger than that for side beams. Then the position of a crossover point 15 of the center beam 14C is shifted toward the direction of a florescent screen. Accordingly a larger incident angle of the beam incident upon a magnetic lens 12S is obtained to correlctly image the crossover point 15 on the fluorescent screen 13. |
