COLOR PICTURE TUBE HAVING AN ELECTRON GUN WITH REDUCED CONVERGENCE DRIFT

摘要

A color picture tube includes a screen and an inlinegun for generating and directing three inline electron beams alongseparate paths toward the screen. The gun includes a plurality ofcathodes and at least six electrodes longitudinally spaced from thecathodes. The first, second and fourth electrodes from thecathodes are of materials having lower coefficients of thermalexpansion than the coefficients of thermal expansion of thematerials of the other electrodes.