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    • 9. 发明公开
    • Apparatus having a television camera tube and a television camera tube for use in such an apparatus
    • 具有电视相机管和电视摄像机的装置,用于这种装置
    • EP0255742A3
    • 1989-04-26
    • EP87201388.3
    • 1987-07-21
    • Philips Electronics N.V.
    • van Roosmalen, Johannes Hendrikus Theodorusvan Gorkum, Aart Adrianus
    • H01J31/38H01J29/48
    • H01J31/38
    • A television camera tube which has an anti-comet-tail electron gun. In such tube a target plate (11) is line scanned by a focused electron beam which is at a cathode voltage of typically zero volts to stabilise the scanned area of the target plate (11) at that voltage and in so doing producing an output signal. During line flyback, the cathode voltage is increased to 5 V and the beam current is increased so that the target plate (11) is stabilised at that voltage. By this means the effects of moving high intensity lights can be mitigated. However if the electron beam is focused during flyback then intense damage can be done to the photo-conductive layer of the target plate. A television camera tube is described in which the electron gun (14) is a multi-spot triode electron gun comprising a cathode (15), a multi-apertured control grid (16) and a multi-apertured accelerating anode (17). During line scanning a single low current electron beam is produced from the centre of the cathode (15) and during line flyback a plurality of low current electron beams are produced to form a large spot which does not damage by ion bombardment the photo-­conductive layer of the target plate (11).
    • 具有反彗尾电子枪的电视摄像机管。 在这种管中,目标板(11)被聚焦电子束扫描,该聚焦电子束处于典型为零伏特的阴极电压,以在该电压下稳定目标板(11)的扫描区域,并且产生输出信号 。 在线反激期间,阴极电压增加到5V,并且射束电流增加,使靶板(11)稳定在该电压。 这样可以减轻移动高强度灯的影响。 然而,如果电子束在反激时聚焦,则可以对目标板的光导层进行强烈的损伤。 描述了电子枪(14)是包括阴极(15),多孔控制栅格(16)和多孔加速阳极(17)的多点三极管电子枪的电视摄像机管。 在线扫描期间,从阴极(15)的中心产生单个低电流电子束,并且在线回扫期间,产生多个低电流电子束以形成不会被离子轰击损坏的光导体层 的靶板(11)。