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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。
In this paper, the structural characteristics of 9 "kinescope electron gun are analyzed, and the three main factors that affect the size of electron beam spot on the screen are discussed: lens magnification, spherical aberration and space charge effect. , Increasing the distance between the modulation pole and the accelerating pole to reduce the size of the minimum cross-section of the electron beam and the divergence angle of the electron beam; and adjusting the position of the electron gun in the picture tube to increase the distance between the deflection yoke and the deflection yoke To reduce the deflection defocusing caused by the stray magnetic field of the deflection yoke, so as to effectively improve the focusing performance of the whole tube and obviously improve the resolution of the edge part. The test results and the mass production of the tube Tests show that: The above method is fruitful, and its edge resolution can be increased by more than 50 lines.