| 摘要 |
PURPOSE:To reduce the emission of unnecessary electrons of a cathode-ray tube by producing a black layer on the surface of the grid electrode being the emission source of unnecessary electrons of an electron gun. CONSTITUTION:For example, the 2nd. grid electrode 12 made of nonmagnetic stainless steel is heat-treated in a wet hydrogen atmosphere at 1000 deg.C for 6 min. By this heat-treatment Cr, one of the component Ni, Fe, Cr of the nonmagnetic stainless steel, is oxidized selectively and a black layer 28 of black 5-3 chrome oxide is produced on the surface. An electron gun is assembled with the 2nd. grid electrode treated for blacking like this, and is mounted on a cathode-ray tube.
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