| 摘要 |
In the method of manufg. a color TV display tube, marks for the positioning of the display window are provided on the funnel part of the tube. For providing the marks, for example abutments, reference surfaces, recesses or ribs, the funnel part is fixed in a centering device which determines in the funnel part a reference point(D') to which provision of the marks is referenced. The reference point is situated in the deflection center of a deflection device provided afterwards on the funnel part. Consequently even if the end of the funnel part to which the display screen is attached has been ground obliquely correct color purity and static convergence can be obtained.
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