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一、前言现今彩色电视机使用的显象管,全是荫罩式阴极射线管,由于荧光粉的高效率,电子枪、偏转系统的高精度,使电视机的图象质量、亮度、稳定性等均达到了实用的高水平。但是,由于使用三电子束,荫罩透过率低,只有20％,荧光屏色条(或色点)和荫罩、电子枪的相对似置精度要求严,制造难度大,特别是显象管扁平化,荫罩更是不可逾越的障碍。另一方面,荫罩吸收了80％的束电流,以致受热严
I. Introduction Today’s color television sets used in the picture tube, all shadow mask cathode ray tube, due to the high efficiency of the phosphor, electron gun, deflection system of high precision, the television image quality, brightness, stability, etc. Have reached a practical high level. However, due to the use of three electron beams, the shadow mask has a low transmittance of only 20%, the color bar (or color point) of the screen and the relative accuracy of the shadow mask and the electron gun are very strict and difficult to manufacture. In particular, Mask, mask is an insurmountable obstacle. On the other hand, the shadow mask absorbs 80% of the beam current and becomes very hot