Method of manufacturing a color cathode-ray tube comprising a ma

Details Method of manufacturing a color cathode-ray tube comprising a ma Method of manufacturing a color cathode-ray tube comprising a ma

1984-08-29

1986-09-30

Ramsey, Kenneth J.

Electric lamp or space discharge component or device manufacturi

Process

Electrode making

335212, 313403, H01J 9236

Patent

active

046145010

ABSTRACT:
In a method of manufacturing a color cathode-ray tube comprising a magnetic quadrupole post-focusing mask (7) the mask (7) is formed by a plate of permanent magnetizable material in which apertures (9) are provided arranged according to rows. Sections of the plate are successively magnetized by positioning parallel conductors (21, 22, 23) on at least one side of the plate in such manner that each time two conductors through which an electric current flows in opposite directions are situated between two rows of apertures (9) and a magnetic quadrupole is formed along the circumference of each of the apertures (9). A number of outermost conductors (30, 31, 32, 33) determines an edge area of the section. In order to prevent the occurrence of disturbing magnetization errors in the edge area, the edge area is made to coincide with a part of a preceding section already magnetized according to the desired strength. A magnetic induction is generated in the edge area according to a pattern corresponding to the existing pattern in the preceding section but having a strength which decreases towards the outermost conductor (30 ).

REFERENCES:
patent: 4135111 (1979-01-01), Verweel
patent: 4428736 (1984-01-01), Verweel et al.

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