| 摘要 |
PURPOSE:To enable spot knocking operation to be effectively performed by connecting a conductive wire, which has an electric-discharge gap, parallel to a path which connects the high-voltage electrode of an electron gun to a high- electric-resistance conductive film provided inside the funnel. CONSTITUTION:An inner conductive film 8 provided inside the funnel 2 of a cathode-ray tube, consists of a film 8a with a low electric resistance and a film 8b with a high electric resistance. A high voltage is applied to a high-voltage electrode 10a of an electron gun 10 through the high-electric-resistance conductive film 8b. Here, a conductive wire 13 having a discharge gap 15 is connected parallel to the path of the conductive film 8b. Therefore, when artificial electric discharge is generated in the high-voltage electrode 10a of the electron gun 10 during spot knocking so as to remove stains and foreign substances, the electric discharge can be carried out through the conductive wire 13 and the discharge gap 15. As a result, the effect of spot knocking can be exhibited without receiving any influence of the high-resistance conductive film 8b. |
