Improvement of Beam Spot Size of CRT by External Magnetic Field

Abstract

The spot size of CRT determines the resolution of the system. To improve the spot size, we proposed the new system by externally applied magnetic field, which was generated by the windings on the deflection yoke. The numerical simulation showed that the magnification of the system can be improved by 20% on the 17"-valve screen corner. And also the dynamic voltage, which was applied to the electro-quadrupole lens in the electron gun was reduced to 50% of an ordinal CRT.