地磁场对彩色显像管的影响及减小方法

摘要

根据世界地磁图，计算了单个运动电子的全球受力分布，得出地磁场对彩色显像管具有不可忽视的影响；为减小地磁的影响，提出了一种有效的屏蔽措施，其屏蔽机理是利用铁磁材料的高磁导率对地磁场进行磁分路．此外，就屏蔽效果与现有的屏蔽方式作了对比分析．结果表明，采用该措施，地磁场影响明显减小．%The world magnetic force distribution of single moving electron is computed according to the world terrestrial magnetism map. It is pointed out that the influence of geomagnetic field on kinescope can not be ignored. A more effec-tive shielding measure is suggested to reduce the influence of geomagnetic field, whose shielding principle is that magnet-ic route of geonagnetic field is separated by high permeability of ferromagnetic material. The shielding result of the newstyle is compared with that of the popular shielding style. The influence of geomagnetic field is obviously reduced after thenew style is adopted.