| 摘要 |
<p>In a cathode ray tube comprising an electron gun having a cathode 1 and five grids (G1, G2, G3, G4 and G5), the first grid (G1) being a control grid, and the fifth grid (G5) being a final acceleration grid and the second grid (G2) being an acceleration grid, the third grid (G3) is impressed with a higher potential than the neighboring second grid (G2) and the fourth grid (G4), thereby producing an axial potential distribution profile having a maximum point at the region of the third grid (G3), to provide a steeply rising electric field in the beam forming part near the cathode, and on the other hand producing a gently changing potential distribution after the third grid (G3).</p> |
