ABSTRACT
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The cathode-ray tube (CRT), more popularly called the Braun tube in Japan and some other countries after its inventor, Professor Karl Ferdinand Braun, is the most widely used display device. It has applications ranging from color television sets and giant screens to computers. An excellent book describing the past developments of CRTs has been published.1 The structure of a typical CRT is shown in Figure 1. The glass vacuum envelope has a neck tube, a funnel, and a face plate. On the back of the face plate, there is a phosphor screen. The electron gun that generates the electron beam is inside the neck tube. The electron-beam deflection device is placed in the area between the neck tube and funnel. The deflection plates are positioned inside the neck tube and the deflection yoke is positioned outside the neck tube.
