| 摘要 |
PURPOSE:To prevent the occurrence of any crack due to an electron impact on a neck glass inner wall surface, by forming a medium impressing electrode in a cathode-ray tube in a way of connecting a resistance element in the specified value to a low voltage impressing electrode via a discharge gap or the like. CONSTITUTION:A heater 271, a cathode 272, first, second and fourth grids 273, 274 and 276 serving as a low voltage impressing electrode are all connected each other outside a tube, and further connected to a grounding side 26b of a high voltage generator 24 via a series high voltage resistor 28, while third and fifth grids 175 and 177 serving as a medium impressing electrode are designed so as to be connected to the low voltage impressing electrode via a compensation resistor 30 having the specified impedance. On the other hand, an anode terminal 28 of a television picture tube 27 is connected direct to a high voltage side 26a of the high voltage generator 24. Each resistance value of this series voltage resistor 29 and the compensation resistor 30 having the specified impedance varies with types and circuit conditions of the high voltage generator 24 but it is so recommended as to be selected in a range of 1-100kOMEGA. |
