| 摘要 |
In an image pick-up tube of the type having a cathode electrode which emits a scanning electron beam, a control electrode which regulates the current of the electron beam at the cathode electrode and through which there is a control electrode current flow during operation of the tube, and a target electrode from which a video output current signal is obtained in correspondence to incident light from an object image projected on the target electrode as the latter is scanned by the electron beam, apparatus for controlling the electron beam in the image pick-up tube includes a resistive circuit for generating a beam control voltage signal from the video output current signal, a circuit for supplying the beam control voltage signal to the control electrode for regulating the current of the electron beam at the cathode electrode, and a resistive element responsive to the control electrode current for imparting a non-linear characteristic to the beam control voltage signal for varying levels of the incident light to increase the stable operating range of the pick-up tube.
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