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目前,国产16英寸黑白显象管(40SX12B)电子枪,采用带膜片的发射系统——预透镜结构,如图1。这种结构比较复杂,增加了工艺过程,不利于成本的降低。为了寻求一种结构合理的电子光学系统,我们采用有限元素法计算了两种形式的发射系统如图2(a)、(b)的拉普拉斯场分布,在此基础上用小步抛物线法绘制了它们的电子轨迹,比较它们的交叉截面半径及其发散角的变化。结果表明,若用下二阳极端帽在电子束入口处翻边的办法,就要比原结构更为合理,而且又不至于改变电子光学系统的原结构参数和馈电条件。
At present, the domestic 16-inch black and white picture tube (40SX12B) electron gun, the launch system with a diaphragm - pre-lens structure, shown in Figure 1. This structure is more complex, an increase of the process is not conducive to cost reduction. In order to find a reasonable structure of the electronic optical system, we use the finite element method to calculate the two forms of the launch system shown in Figure 2 (a), (b) Laplacian field distribution, on this basis, with a small step parabola The law draws their electron trajectories, comparing their cross-sectional radii and their divergence angles. The results show that if using the next two anode caps flanging at the electron beam entrance, it is more reasonable than the original structure, and does not change the original optical electronic system parameters and feed conditions.