| 摘要 |
PURPOSE:To obtain an excellent magnetic-focusing-type cathode-ray tube, which has a high reliability and in which concentration of three beams is performed with the magnetic-focusing device itself, by making a magnetic field, which develops between opposed magnetic yorks and is in the direction of the tubular axis, to be at a given angle from the tubular axis on the side-beams passing positions. CONSTITUTION:Electron beams 41B, 41G and 41R, after passing through magnetic yorks 42 and 43 which have almost no deflection comonents, become incident upon a magnetic-york gap. The main magnetic field is directed toward the Z+ direction (screen) on the magnetic-york gap as illustrated in the figure, and made to have an outward magnetic component slanting a given angle (theta) from the traveling direction of the beam on the beams 41R and 41B. The electron beam 41R is given a speed in the (X-) direction and a speed in the (Y+) direction, which is neutralized by a Y--direction speed component received by the beam 41 in the A-A' section. As a result, the beam 41R comes to have only the (X-)- direction speed component. In contrast, the beam 41B located on the oppsite side to the beam 41R obtains an (X+)-direction speed component in the same manner as above. Consequently,the side beams 41R and 41B recevie concentric effects directing toward the center beam 41G. |
