A new approach to kinescope beam convergence

Misconvergence of the beams in color kinescopes because of deflection has been corrected in the past by the use of dynamic convergence devices. Six independent fields are required to deflect three beams without misconvergence. Conventional deflection yokes supply two of these fields; the remaining four are supplied by convergence magnets. This paper describes a more general system that uses six coexistent deflection fields. Such a system is capable of producing deflection without misconvergence, and in contrast to conventional systems produces no loss in color purity tolerance. A particular embodiment of this system is discussed in detail. It employs a six-coil "converger" used in combination with a conventional deflection yoke. The results of an experimental investigation of this embodiment are given.