COLOR PICTURE TUBE HAVING AN ELECTRON GUN WITH REDUCED CONVERGENCE DRIFT

摘要

The color image tube 10 includes a screen 22 and an inline electron gun 26 for generating and focusing 23 inline electron beams 28 toward the screen along the separation path.;The electron gun includes a plurality of cathodes 34 and at least six electrodes 36, 38, 40, 42, 44, 46 spaced apart longitudinally from the cathode. The first 36, second 38 and fourth 42 electrodes at the cathode consist of a material having a lower coefficient of thermal expansion than that of other electrode materials.