| 摘要 |
PROBLEM TO BE SOLVED: To provide a cathode-ray tube having a good image characteristic over the whole screen by reducing lateral collapsing of an electron beam on the periphery of the screen, due to a lens magnification difference between horizontal and vertical directions. SOLUTION: An electron gun of this cathode-ray tube comprises a main electron lens part composed of at least four electrodes of fifth, sixth, seventh, and eighth grids 5, 6, 7, 8 arranged in this order, and the fifth grid 5 is impressed with a medium first voltage, and the eighth grid 8 is impressed with a positive electrode voltage. The sixth grid 6 is connected to the adjacent seventh grid 7 through a resistor 100, and they respectively impressed with nearly equal second voltage and third voltage equivalent to nearly an intermediate voltage between the first medium voltage and the positive electrode voltage. The respective grids are arranged such that the second capacitance between the sixth and seventh grids 6, 7 is smaller than the first capacitance between the fifth and sixth grids 5, 6, and the third capacitance between the seventh and eight grids 7, 8.
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