基于CCD的CDT电子束着屏误差自动测试系统

An automatic testing system based on CCD for color display tube electron beam landing screen error

利用CCD图像传感器和图像采集处理技术,实现了电子束着屏误差二维自动测量。在荧光屏的前端附加垂直和水平两组微偏转线圈,通过控制微偏转线圈的电流,改变着屏点附近的磁场,使电子束着屏点的位置在一个粉点范围内精确连续可调。标准光栅的测试验证,系统绝对误差小于5m,表明该系统稳定可靠,一致性好。

D automatic measurement of electron beam landing screen error is realized by means of CCD image sensor and image processing techniques. By attaching two groups of vertical and horizontal mini-deflection coil at front end of screen, through controlling current of mini-deflection coil and changing magnetic field near electron beam landing screen point, the position of the point is continuously adjustable within the range of a phosphor powder spot. Test of standard grating demonstrates that the system absolute error is less than 5 microns. This shows that the system is stable and reliable, and has a good consistency.