| 摘要 |
PURPOSE:To make an electrostatic deflection type electronic tube execute dynamic focusing easy, by supplying a superposed signal of a saw tooth signal, and a parabolic signal having the same period and synchronizing with said signal, as a deflecting signal to a deflecting electrode. CONSTITUTION:To horizontal and vertical deflecting electrodes G3' of an electronic gun 2, a superposed signal consisting of saw tooth wave signals of horizontal and vertical periods, and parabolic wave signals of horizontal and vertical periods synchronizing with said signals are applied as deflecting signals, respectively. Also, between an electric power source +B and ground, a biasing circuit 13 constituted of resistances 14-17 is connected to transistors 11 and 11'. Moreover, the collector of a switching transistor 19 is connected to the collector of the transistor 11, and to an input terminal 20 led out from its base, a horizontal or vertical pulse 21 of the positive polarity is provided. Also, a horizontal or vertical saw tooth signal 23 of the positive polarity is applied to an input terminal 22, and a superposed signal 6 of the positive polarity is outputted to an output terminal 24. |
