| 摘要 |
PROBLEM TO BE SOLVED: To further improve withstand voltage performance of a cathode ray tube by removing even foreign matter remaining in a cup like electrode interior wherein withstand voltage is improved by applying a high voltage of a normal specific operating voltage or more to a grid electrode, generating discharge between the foreign matter adhered to an electrode structure and the grid electrode facing it, and removing the foreign matter from the electrode structure, but particularly in an electric gun adopting a cup like electrode structure, it is hard to generate discharge with respect to the foreign matter existing in a cup like electrode structure interior, and consequently, the foreign matter remains in the electric gun interior, and it deteriorates withstand voltage performance. SOLUTION: By applying horizontal and vertical magnetic fields to the electric gun 19 by a high frequency magnetic field generator from a neck 17 outer part of the cathode ray tube, the foreign matter 30 existing in the electrode structure Gb interior is moved to an electrode structure Gb exterior, and a high voltage of the specific operating voltage or more is applied to the electric gun 19 to remove the foreign matter 30 by discharge. COPYRIGHT: (C)2006,JPO&NCIPI
|
