| 摘要 |
PURPOSE:To standardize the optimum focus voltage of the whole electric current area, by setting both side cathodes at a slant with the central cathode, and arranging so that the distance between the central cathode and the first grid is longer than the distance between the each side cathode and the first grid. CONSTITUTION:The block end surface 21 of the first grid G1 of an inline type electron gun is formed of inclined surfaces 21a, 21b, and a concave part 24 is formed at the center of this end surface 21. The block end surface 22 of the second grid G2 is formed of inclined surfaces 22a, 22b which are respectively parallel with each of said inclined surfaces 21a, 21b, and a concave part 23 is formed at the center of this end surface 22. Cathodes KR, KG, KB are arranged in the first grid G1 as they are respectively perpendicular with each of said inclined surfaces 21a, 21b and said concave part 24. Then, the concave part 23 (t12) of the second grid G2 is made to be less than the inclined surfaces 22a, 22b (t22) in thickness, and the distance d01 between KG and G1 is made to be longer than the distance d11 between KR, KB and G1. Accordingly, a clear picture can be got, as the difference between the optimum focus voltage of both side beams and that of the center beam can be decreased.
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