PROCESS AND APPARATUS FOR DETECTING THE VAPORIZATION OF GETTER MATERIAL DURING THE MANUFACTURE OF A CATHODE RAY TUBE, ESPECIALLY FOR TELEVISION

摘要

A method for checking the evaporation of a pellet of getter material such as barium on the walls of the envelope of a cathode-ray tube during manufacture. The pressure within the cathode-ray tube is measured during the operation involving stabilization of the cathode material by measuring the positive-ion charge within the tube.