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    • 7. 发明授权
    • Projection lens for projection television
    • 投影电视投影镜头
    • US4620773A
    • 1986-11-04
    • US494447
    • 1983-05-13
    • Kyohei Fukuda
    • Kyohei Fukuda
    • G02B13/16G02B13/18H04N5/74G02B9/34G02B27/18
    • G02B9/34G02B13/16G02B13/18H04N5/7408
    • A projection lens for magnifying an image displayed on a cathode-ray tube and projecting the magnified image on a projection screen comprises a first lens having a substantially plano surface opposite to the cathode-ray tube and a concave surface, a second lens which is convex meniscus lens having a concave surface opposite to the concave surface of the first lens, a third lens having a strongest positive refracting power and at one convex surface, and a fourth lens spaced apart by a predetermined distance from the third lens having at least one convex surface. The first to fourth lenses are arranged in the above order from the side of the cathode-ray tube, and the predetermined distance between the third and fourth lenses is large enough to permit interposition of a plano reflecting mirror therebetween.
    • 用于放大显示在阴极射线管上的图像并将放大图像投影在投影屏幕上的投影透镜包括具有与阴极射线管相对的大致平面的第一透镜和凹面,第二透镜为凸面 弯月透镜具有与第一透镜的凹面相反的凹面,具有最强正折射率的第三透镜和一个凸面,以及与第三透镜间隔开预定距离的第四透镜,具有至少一个凸起 表面。 第一至第四透镜从阴极射线管侧按照上述顺序排列,并且第三透镜和第四透镜之间的预定距离足够大以允许在其间插入平面反射镜。
    • 9. 发明授权
    • Magnetic focusing structure for three in-line gun type color picture
tubes
    • 三线直插式彩色显像管的磁聚焦结构
    • US4310780A
    • 1982-01-12
    • US72913
    • 1979-09-06
    • Soichi SakuraiKyohei FukudaMasanobu Takata
    • Soichi SakuraiKyohei FukudaMasanobu Takata
    • H01J29/50H01J29/64H01J29/51
    • H01J29/64
    • An electron beam focusing structure for a three in-line gun color picture tube comprises a permanent magnet or a focusing coil and a pair of magnetic yokes made of magnetic material high in magnetic permeability and having beam-passing through-holes and being disposed opposite to each other and perpendicular to the axis of the tube, for controlling the focusing magnetic fields generated for the plural electron beams by the permanent magnet or focusing coil in such a manner that the beams converge near the phosphor screen and focused respectively on the phosphor screen. The magnetic yokes are provided with cylindrical magnetic members extending in the axial direction of the tube, the cylindrical magnetic members for the center beam being different in length from the cylindrical magnetic members for the side beams, whereby the effective pole gap lengths for the respective beams between the magnetic yokes are so controlled as to provide optimum focusing fields for the respective beams. As an alternative form of the magnetic members, recesses are provided in the periphery of the throughholes with different depths.
    • 一种用于三行串联枪彩色显象管的电子束聚焦结构,包括永磁体或聚焦线圈以及由磁导率高的磁性材料制成并具有光束通过通孔并与之相对设置的一对磁轭 彼此垂直于管的轴线,用于通过永磁体或聚焦线圈控制由多个电子束产生的聚焦磁场,使得光束在荧光屏附近会聚并分别聚焦在荧光屏上。 磁轭设置有沿管轴向延伸的圆柱形磁性构件,用于中心梁的圆柱形磁性构件的长度与用于侧梁的圆柱形磁性构件的长度不同,由此各个梁的有效磁极间隙长度 在磁轭之间被控制以便为各个光束提供最佳聚焦场。 作为磁性构件的替代形式,在具有不同深度的通孔的周边设置有凹部。