| 摘要 |
A cathode ray tube comprises an envelope, an electron beam source positioned at one end of the envelope, a target positioned at another end of the envelope, a mesh electrode positioned opposite to the target, and an electrostatic lens means positioned between the electron beam source and the mesh electrode. The lens means has a high-tension electrode and a low-tension electrode positioned along the electron beam path to focus the electron beam. The low-tension electrode is divided into four arrow or zig-zag patterns to deflect the electron beam. The length l between the electron beam source and the mesh electrode and the length x of the high-tension electrode are selected to optimize the magnification, aberration and landing error of the electrostatic lens means. |
