| 摘要 |
PURPOSE:To obtain an improved picture playback with little strain and color shift by providing three electron-beam discharge holes in the bottom plate of a cup-like body, and providing two magnetic metal pieces rising from the peripheries of the two side discharge-holes so that the said pieces face to one another with the center discharge hole located between them. CONSTITUTION:A cup-like non-magnetic metal body 3, which is attached to an electrode provided at the end of an in-line-type electron gun, is provided with a first and a second magnetic metal piece 9 and 10. The metal pieces 9 and 10, which surround electron-beam discharge holes (b) and (r) provided in a bottom plate 4 of the cup-like body 3, respectively, consist of circular parts 9' and 10' that are in contact with the bottom plate 4, and rising part 9'' and 10'' that are continuous with the parts 9' and 10' and rise almost perpendicularly from the peripheries of the parts 9' and 10'. In addition, the parts 9'' and 10'' face to one another in the direction of the horizontal axis, with a center electron-beam discharge hole (g) located between them. As a result, an improved picture playback with a small degree of strain and color shift can be obtained. |
