| 摘要 |
<p>PURPOSE:To provide a vidicon tube device which can be sufficiently decreased in the aperture so that high resolving power of an image can be realized and a service life can be lengthened. CONSTITUTION:In an electron tube device equipped with an electron beam source 1 which produces an electron beam, electroptic systems 3, 4, 5 which focuses and deflects an electron beam EB and a target 7 scanned by the deflected electron beam EB, the electron beam source 1 is of a field emission type. That is, this electron beam surface 1 includes a substrate 11, a sharp cathode 12 installed projected from the substrate 11, and a control electrode 14 installed on the substrate 11, as insulated from this cathode 12 and a potential difference exceeding a threathhold value where field emission of an electron from the cathode 12 may occur is provided between the cathode 12 and the control electrode 14 only in a period other than the fly-back line period of scanning by the electron beam EB.</p> |
