| 摘要 |
An electron gun assembly for a CRT includes three cathode electrodes, a control electrode, an electron-stream extractor electrode, a focusing electrode, and an anode electrode. The electron-stream extractor electrode includes first, second, and third holes, each of which allows one of the three streams of the electrons to pass through. The focusing electrode includes a flat portion having fourth, fifth, and sixth holes, each of which allows one of the three streams of the electrons to pass through. The first, second, and third holes are arranged in the in-line direction. Each of the fourth and sixth holes includes a substantially rectangular opening and a substantially semicircular opening connected to each other. One side of the substantially rectangular opening is connected to a straight line segment of the substantially semicircular opening, and the substantially rectangular opening is disposed outside while the substantially semicircular opening is disposed inside.
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