提高9″显象管边缘分辨率的实验研究

本文从分析9″显象管电子枪的结构特点出发,讨论了影响荧光屏上电子束光点尺寸的三个主要因素:透镜放大率、球面象差和空间电荷效应。提出了用减小调制极孔径,增大调制极与加速极之间的距离等方法来减小电子束最小交叉截面的尺寸和电子束的发散张角;并且以调整电子枪在显象管内的位置,即增大它与偏转线圈之间的相对距离,来减小偏转线圈杂散磁场所引起的偏转散焦;从而有效地改善了整管的聚焦性能,并明显地提高了边缘部分的分辨率。 试验结果和批量生产的管子测试表明:上述方法是卓有成效的,其边缘分辨率能提高50线以上。

AN EXPERIMENTAL INVESTIGATION FOR IMPROVEMENT OF EDGE RESOLUTION OF 9" KINESCOPE

In kinescope electron gun design there are three chief factors which affect the final electron beam spot size. Thes are the magnification factor, the spherical aberration and the space charge effect. In this paper the interrelation between these factors and the resolution is discussed.In order to reduce beam crossover and divergence angle, some methods which make nse of reducing the aperture diameter of G₁ and increasing the spacing between G₁ and G₂ are proposed. By adjusting the position of the electron gun in the kinescope i.e.increasing the distance between the gun and the yoke, the deflection defocusing which is caused by scattering magnetic field of deflection yoke is reduced. Therefore, focnsing performance of kinescope is improved effectively and its edge resolution is increased. Test data show that the above methods are excellent, the increment of edge resolution is better than 50 lines.