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电子束扫描式扁平显像管中，电子束基本要偏转数次后上屏．本文用曲光轴聚焦理论分析了扁平显像管的偏转系统，包括正交场偏转扫描和电极推动扫描方式．文中给出了电子运动所在的电场分布的级数表达式．由变分方程出发，给出了偏转时曲光轴坐标中的高斯轨迹方程，并对方案进行了计算机模拟，分析了各种因素对于偏转电子束的影响．
Electron beam scanning flat picture tube, the electron beam basically deflected several times after the screen. In this paper, the deflection system of flat tube is analyzed by the optical axis focusing theory, including the orthogonal field deflection scanning and the electrode push scanning mode. The paper gives the expression of the series of electric field where the electron motion is. Based on the variational equation, the Gauss trajectory equation in the optical axis coordinate of deflection is given. The scheme is simulated by computer and the influence of various factors on the deflected electron beam is analyzed.