CRT with ring of magnetic material - positioned between cathode and shielding electrode to impose radial field on electron beam

摘要

The cathode (21) is in line with a control electrode (22). A shielding electrode (23) and a focussing electrode (24) are followed by a final acceleration electrode. Magnetic material (30) is located between the cathode and shielding electrode and is of ferrite or a rare earth based material. The ring formed magnetic material generates a field that imposes itself upon the emitted electron beam and improves the emission density. ADVANTAGE - Increases emission density.