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    • 23. 发明授权
    • Cathode ray tube including means for vertically extending the spot
    • 阴极射线管,包括用于垂直延伸的部分
    • US5107171A
    • 1992-04-21
    • US560468
    • 1990-07-25
    • Jan Gerritsen
    • Jan Gerritsen
    • H01J29/48H01J29/56
    • H01J29/563
    • A cathode ray tube, such as a blue luminescing projection television display tube including, in an evacuated envelope (1), an electron gun (5) for generating an electron beam (6) which is focused to a spot (8) on a display screen (7) by means of an electrostatic focusing lens (27, 30) and which is deflected across this display screen (7) in two mutually perpendicular directions (x, y). A structure (37) magnetized as a four-pole and consisting of a magnetic half-hard material is provided at the area of a focusing lens formed by two electrodes (27, 30) and coaxially around the gun axis (20), the axes of the four-pole being located centrally between the deflection directions. The structure (37) extends the spot in the vertical direction so that phosphor saturation, particularly in blue projection tubes is reduced.
    • 一种阴极射线管,例如蓝色发光投影电视显示管,其包括在真空外壳(1)中的电子枪(5),用于产生电子束(6),该电子束聚焦到显示器上的点(8) 屏幕(7)通过静电聚焦透镜(27,30)在两个相互垂直的方向(x,y)上偏转穿过该显示屏(7)。 在由两个电极(27,30)形成并且同轴地围绕枪轴(20)的聚焦透镜的区域处设置由四极磁化而由磁性半硬材料构成的结构(37),轴 四极位于偏转方向之间的中心。 结构(37)在垂直方向上延伸点,使得特别是蓝色投影管中的荧光体饱和度降低。