测试和分析了计算机用显示器(CDTs)的磁散逸场,测量了不同类型的CDTs在不同工作频率及不同工作条件下的磁散逸场.参与测试的CDTs包括两个48 cm的带有不同偏转单元(分别为双贝型偏转单元和鞍鞍型偏转单元)的CDTs.测试和分析结果表明磁散逸场与显示器的工作频率关系不密切,而与屏蔽方式和屏蔽材料关系密切.为了找到简单的方法来减小偏转单元的磁散逸场,本文还做了一系列的实验.实验结果表明,选择导磁材料制作的屏蔽罩能有效地减少磁散逸场的外溢.

The magnetic stray fields of CDTs are measured and analyzed in this paper.The magnetic stray fields of different size CDTs are measured when they work at different operating frequencies.The stray fields of two 48 cm CDTs with differeny DU(double-mussel DU and saddle-saddle DU) are measured in conditions of with/without shielding mask and compensation coil.The measurement results show that stray field has little relationship with operating frequencies but has close relationship with shielding especially the shielding material.Some experiments are carried out to seek for simple method to raduce the stray field of a DU.The experiment results indicate that the shielding mask made by magnetic conductive material can reduce the stray field effectively.