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    • 49. 发明专利
    • DRIVING METHOD FOR WIRE-SHAPED ELECTRON SOURCE
    • JPH04245157A
    • 1992-09-01
    • JP2950491
    • 1991-01-30
    • FURUKAWA ELECTRIC CO LTD
    • HARA TOSHITAKATAKAGI SEISHIYAMAMOTO ICHIRONEGAMI SHOICHI
    • H01J1/15H01J29/98H01J31/12
    • PURPOSE:To prevent image Quality from being deteriorated due to the gradient of electric potential in the longitudinal direction of wire-shaped cathode-ray tube by providing difference in electric potentials through application of voltage to both ends of wire-shaped cathode at the time of discharging electrons, and inverting the gradient of electric potential generated in the wire-shaped cathode. CONSTITUTION:A wire-shaped electron source is composed of a wire-shaped cathode 102 for emitting electrons and an electrode positioned in parallel with and opposite to the wire-shaped cathode 102. In driving the wire-shaped electron source which emits electrons from the cathode 102 after the cathode 102 is turned into a condition where it can emit electrons when it is energized and heated. In the driving method, voltage is applied to both ends of the cathode 102 from a heating power source 201 so as to provide electric potential difference upon emitting of electrons, and the gradient in electric potential generated in the cathode 102 at that time is inverted so as to enable equalization in terms of time. It is thus possible to prevent generation of electric potential gradient in the longitudinal direction of the wire-shaped electrode 102, and prevent generation of scattering in luminousity and deterioration in image quality caused by fluctuation in the diameter of beam spot in the longitudinal direction of the cathode 102.