CATHODE RAY TUBE

摘要

PROBLEM TO BE SOLVED: To provide a bright cathode ray tube improving use efficiency of electron beam by optimizing diameter of electron beam entering into a main lens in all the current area of electron beam. SOLUTION: Electrical potential of a current control electrode GA is related to electrical potential difference between an electron beam generating part (a cathode K, a first electrode G1, a second electrode G2) and a converging accelerating part (a third electrode G3 - a fifth electrode G5). Electrical potential between the electron beam generating part and the converging accelerating part is controlled with the current flowing in the current control electrode GA.