CATHODE-RAY TUBE

摘要

PROBLEM TO BE SOLVED: To provide a cathode-ray tube having high quality and reliability, capable of enhancing resolution. SOLUTION: A pre-focus lens part in an electron gun structure 7 is composed of a second grid G2 disposed on the electron beam generating side, a third grid G3 disposed on the main lens side, and a shield grid GS disposed between the second grid G2 and the third grid G3. The shield grid GS is a cup-shaped electrode having a side wall surrounding the outer periphery of the second grid G2 side of the third grid G3 and being parallel to a tube axis Z, and is disposed with its bottom surface turned toward the second grid G2 side while being disposed with its open end turned toward the third grid G3 side. When voltages applied to the second grid G2, the shield grid GS, and the third grid G3 are defined as Ec, Vf, and Er, a relation of Ec