| 摘要 |
PURPOSE:To remove a difference between brightnesses at the both ends of a display pattern and at the center of there in d-c or a-c lighting by equipping a cathode consisting of heat-proof metallic fine lines, and insulating layers, electroconductive layers and electron radiation layers which are formed in serial order in layered shape at surroundings. CONSTITUTION:Insulating layers 12, electroconductive layers 14 and electron radiation layers 15 are formed on the surroundings of the cathode 1 which is consisting of heat-proof metallic fine line 11. The heater of heat-proof metallic fine line 11 is a tungsten line with about 0.1mm in diameter. The insulating layers 12 are made of aluminum oxide layer and formed in about 50mum-thick layer by plasma flame display method. The electroconductive layers 14 electrically continued with the graphite layers 13 are formed of nickel in about 10mum thickness by plasma flame display method, and the electron radiation layers 15 are coated with three-element carbonate of barium-calcium-trontium in 20mum thickness by electrodeposition process. On account of the cathode 1 being electrically continued with the heater only on its earth side, voltages of the grid and anode to the cathode and Eb and Ec everywhere, and quantity of electrodes colliding with the phosphor becomes uniform, without brightness being slant. |
