专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US5742128A Apparatus for mitigating the effects of ambient magnetic fields on the operation of a CRT 失效
标题翻译：用于减轻环境磁场对CRT操作的影响的装置
公开(公告)号：US5742128A
公开(公告)日：1998-04-21
申请号：US651448
申请日：1996-05-22
申请人： Winfield Scott Bearce , Christopher N. Haywood , John Druchunas
发明人： Winfield Scott Bearce , Christopher N. Haywood , John Druchunas
IPC分类号： H01J29/00 , H04N9/29
CPC分类号： H04N9/29 , H01J29/003 , H01J2229/0038 , H01J2229/0053
摘要： Apparatus for mitigating the adverse effects of magnetic interference on the operation of a CRT is provided. More specifically, magnetic sensors are placed in a gap formed between a front bezel and a rear enclosure comprising a magnetic shield enclosing all but the viewing surface of a CRT. The gap serves to concentrate the on-axis magnetic field and the resultant signal from the sensors is amplified to drive current through a compensation coil located inside the front bezel and in front of the viewing surface of the CRT. The current generates a compensation field that mitigates the incoming on-axis magnetic field. The ambient magnetic field is also sensed by a three axis magnetic sensing assemblage located outside the magnetic shield. The output of the sensing arrangement is operated on to produce a trigger to start a degauss cycle. A resonant degauss circuit, including a degauss coil also disposed around the inside of the front bezel and in front of the viewing surface of the CRT, is driven by a balanced bridge rail switch which repeatedly reverses the polarity of the voltage across the resonant circuit. This produces a high voltage squarewave that serves to drive current through the degauss coil. This generates a degauss field which degausses the CRT.
摘要翻译：提供了用于减轻磁干扰对CRT操作的不利影响的装置。更具体地说，磁传感器被放置在形成在前挡板和后围壳之间的间隙中，该间隙包括围绕除CRT观察表面之外的所有磁屏蔽的磁屏蔽。该间隙用于集中在轴上的磁场，并且来自传感器的合成信号被放大，以驱动电流通过位于前挡板内的补偿线圈并在CRT的观察表面前方。电流产生一个减小输入的轴上磁场的补偿场。环境磁场也由位于磁屏蔽外部的三轴磁感应组件感测到。感测装置的输出被操作以产生启动消磁循环的触发器。包括围绕前挡板的内部并且在CRT的观察表面前方布置的消磁线圈的谐振消磁电路由平衡的桥轨开关驱动，该开关重复地反转谐振电路两端的电压的极性。这产生用于驱动电流通过消磁线圈的高电压方波。这产生消磁CRT的消磁场。

IPRDB

热门服务

关于我们

友情链接

联系方式