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    • 136. 发明授权
    • Lens system for projection television receivers
    • 投影电视接收机镜头系统
    • US4884879A
    • 1989-12-05
    • US911070
    • 1986-09-24
    • Kyohei FukudaSoichi SakuraiKoji HirataShigeru Mori
    • Kyohei FukudaSoichi SakuraiKoji HirataShigeru Mori
    • H04N5/74G02B13/16G02B13/18
    • G02B9/34G02B13/16G02B13/18
    • An optical system of a projection television receiver for projecting pictures from a picture tube onto a screen, comprising a fluorescent face constituting the tube face of the receiver tube having a nonspherical shape in such a direction as to compensate the curve of the image face of the projected picture on the screen, and further comprising lenses arranged from the screen side to the tube face of the picture tube in the order of:(A) a first lens having relatively weak power (reciprocal of focal distance) and having a nonspherical shape at least at one face;(B) a second lens having relatively strong positive power;(C) a third lens having relatively weak power and having a nonspherical shape at least at one face; and(D) a fourth lens having relatively strong negative power and having a concave shape at the face of the screen side.
    • 一种投影电视接收机的光学系统,用于将图像从显像管投影到屏幕上,包括构成接收管的管面的荧光面,其方向具有非球面形状,以补偿图像的图像面的曲线 并且还包括从屏幕侧到显像管的管面布置的透镜,其顺序为:(A)具有相对弱的功率(焦距的往复)并且具有非球面形状的第一透镜 最少在一个脸上 (B)具有相对较强正功率的第二透镜; (C)至少在一个面上具有较弱功率并具有非球形形状的第三透镜; 和(D)具有相对较强的负功率并且在屏幕侧的表面具有凹形形状的第四透镜。