| 摘要 |
<p>An improved color picture tube has an inline electron gun for generating and directing three electron beams, a center beam and two side beams, along coplanar paths toward a screen of the tube. The gun includes a main focus lens for focusing the electron beams. The main focus lens is formed by two spaced electrodes each having three separate inline apertures therein. Each electrode also includes a peripheral rim. The peripheral rims of the two electrodes face each other. The apertured portion of each electrode is within a recess set back from the rim. The main focus lens electrode closest to the screen includes a slot on the side facing the screen. The slot extends in the direction of the three electron beam paths. The slot is wider, in a direction perpendicular to the plane of the three electron beam paths, at the side beam paths than at the center beam path.</p> |
