Color cathode ray tube apparatus to modify deflection magnetic fields
    1.
    发明授权
    Color cathode ray tube apparatus to modify deflection magnetic fields 失效
    彩色阴极射线管设备修改偏转磁场

    公开(公告)号:US4600858A

    公开(公告)日:1986-07-15

    申请号:US609009

    申请日:1984-05-10

    CPC分类号: H01J29/56 H01J29/707

    摘要: In a cathode ray tube apparatus having an in-line type electron gun, magnetic pole pieces comprising four pole pieces of substantially arc-shaped cross section are disposed in a cylindrical shape with circumferential gaps between neighboring pole pieces 0.degree., 90.degree., 180.degree., and 270.degree. locations on the cylinder. An additional pair of narrow width stripe-shaped pole pieces are disposed inside said cylinder at a predetermined distance from the cylinder in a manner to cover the 90.degree. and 180.degree. gaps. The apparatus acting to modify the horizontal and vertical deflection magnetic fields so that the electron beam spots on the phosphor CRT screen are substantially circular in shape without losing the self convergence effect of the magnetic fields.

    摘要翻译: 在具有直列式电子枪的阴极射线管装置中,包括大致圆弧形截面的四个极片的磁极片以相邻极片0°,90°,180°之间的周向间隙的圆柱形状设置 ,气缸270度。 另外一对窄宽度的条状极片以覆盖90°和180°间隙的方式设置在所述气缸内与气缸隔开预定距离的位置。 用于改变水平和垂直偏转磁场的装置,使得荧光体CRT屏幕上的电子束斑点基本上是圆形的,而不损失磁场的自会聚效应。